CN115218652A - Multi-section liquid fuel concurrent heating coupling hot air sintering method and device - Google Patents
Multi-section liquid fuel concurrent heating coupling hot air sintering method and device Download PDFInfo
- Publication number
- CN115218652A CN115218652A CN202111045882.XA CN202111045882A CN115218652A CN 115218652 A CN115218652 A CN 115218652A CN 202111045882 A CN202111045882 A CN 202111045882A CN 115218652 A CN115218652 A CN 115218652A
- Authority
- CN
- China
- Prior art keywords
- liquid fuel
- fuel injection
- heat
- hot air
- liquid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 1091
- 239000007788 liquid Substances 0.000 title claims abstract description 764
- 238000005245 sintering Methods 0.000 title claims abstract description 253
- 238000000034 method Methods 0.000 title claims abstract description 72
- 238000010438 heat treatment Methods 0.000 title claims abstract description 65
- 230000008878 coupling Effects 0.000 title claims abstract description 18
- 238000010168 coupling process Methods 0.000 title claims abstract description 18
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 18
- 238000002347 injection Methods 0.000 claims abstract description 438
- 239000007924 injection Substances 0.000 claims abstract description 438
- 239000000463 material Substances 0.000 claims abstract description 95
- 239000007789 gas Substances 0.000 claims abstract description 53
- 230000008016 vaporization Effects 0.000 claims abstract description 42
- 239000000203 mixture Substances 0.000 claims abstract description 29
- 230000020169 heat generation Effects 0.000 claims description 54
- 238000005192 partition Methods 0.000 claims description 48
- 238000001514 detection method Methods 0.000 claims description 45
- 208000019206 urinary tract infection Diseases 0.000 claims description 32
- 230000008569 process Effects 0.000 claims description 31
- 238000009834 vaporization Methods 0.000 claims description 30
- 238000009835 boiling Methods 0.000 claims description 25
- 238000010025 steaming Methods 0.000 claims description 21
- 239000000243 solution Substances 0.000 claims description 11
- 239000003225 biodiesel Substances 0.000 claims description 9
- 239000003502 gasoline Substances 0.000 claims description 8
- 239000003350 kerosene Substances 0.000 claims description 8
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 5
- 150000001335 aliphatic alkanes Chemical class 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 claims description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims 1
- 239000001257 hydrogen Substances 0.000 claims 1
- 229910052739 hydrogen Inorganic materials 0.000 claims 1
- 238000001704 evaporation Methods 0.000 abstract description 20
- 230000008020 evaporation Effects 0.000 abstract description 20
- 230000000694 effects Effects 0.000 abstract description 18
- 230000009467 reduction Effects 0.000 abstract description 9
- 239000002918 waste heat Substances 0.000 abstract description 6
- 230000006872 improvement Effects 0.000 abstract description 5
- 239000002131 composite material Substances 0.000 abstract description 4
- 239000003570 air Substances 0.000 description 229
- 101100127891 Caenorhabditis elegans let-4 gene Proteins 0.000 description 23
- 239000004449 solid propellant Substances 0.000 description 22
- 238000002485 combustion reaction Methods 0.000 description 20
- 238000004519 manufacturing process Methods 0.000 description 14
- 239000002245 particle Substances 0.000 description 12
- 238000009826 distribution Methods 0.000 description 9
- 239000013589 supplement Substances 0.000 description 9
- 230000001502 supplementing effect Effects 0.000 description 9
- 238000000889 atomisation Methods 0.000 description 8
- 239000002994 raw material Substances 0.000 description 6
- 239000007921 spray Substances 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 230000009471 action Effects 0.000 description 5
- 239000004519 grease Substances 0.000 description 5
- 239000010806 kitchen waste Substances 0.000 description 5
- 238000005507 spraying Methods 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 239000003245 coal Substances 0.000 description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 description 4
- 239000007791 liquid phase Substances 0.000 description 4
- 239000011707 mineral Substances 0.000 description 4
- 125000003158 alcohol group Chemical group 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 238000005338 heat storage Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 230000008646 thermal stress Effects 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011982 device technology Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000005453 pelletization Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
- F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace
- F27B9/26—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace on or in trucks, sleds, or containers
- F27B9/262—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace on or in trucks, sleds, or containers on or in trucks
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
- F27B9/36—Arrangements of heating devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
- F27B9/40—Arrangements of controlling or monitoring devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D99/00—Subject matter not provided for in other groups of this subclass
- F27D99/0001—Heating elements or systems
- F27D99/0005—Injecting liquid fuel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
- F27B9/36—Arrangements of heating devices
- F27B2009/3607—Heaters located above the track of the charge
- F27B2009/3615—Burner in the ceiling directed vertically downwards
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
- F27B9/36—Arrangements of heating devices
- F27B2009/3653—Preheated fuel
- F27B2009/3661—Preheated fuel preheated with the exhaust gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27M—INDEXING SCHEME RELATING TO ASPECTS OF THE CHARGES OR FURNACES, KILNS, OVENS OR RETORTS
- F27M2003/00—Type of treatment of the charge
- F27M2003/04—Sintering
Abstract
A multi-stage liquid fuel concurrent heating coupling hot air sintering method comprises the following steps: 1) The sintering machine is provided with a liquid fuel injection section, the liquid fuel injection section is sequentially divided into a plurality of fuel injection sections along the running direction of the sintering machine trolley (1), and each fuel injection section respectively injects liquid fuel to the sintering mixture charge level at the corresponding position in the sintering machine trolley (1); 2) Respectively introducing a heat medium into each fuel injection section, and heating and vaporizing the liquid fuel injected on the sintering charge surface by the heat medium to form liquid fuel vapor; 3) The mixed gas of liquid fuel steam and heat medium in each fuel injection section enters the sintering material layer to be combusted and heat supplied to assist sintering. According to the invention, various liquid fuels are adopted for heat compensation, and multi-section hot air evaporation is adopted for auxiliary sintering, so that the technical effect of composite heat compensation of various liquid fuels is realized, and meanwhile, hot air with different temperatures can be utilized in a gradient manner, so that multiple effects of waste heat utilization, emission reduction, quality improvement and the like are realized.
Description
Technical Field
The invention relates to a fuel heat-supplementing sintering process, in particular to a multi-section liquid fuel heat-supplementing coupling hot air sintering method and a device thereof, belonging to the technical field of sintering.
Background
As a key link in the iron-making process in the iron and steel industry, the sintering process mainly has the main functions of mixing various powdery iron-containing raw materials with proper amount of fuel and flux, adding proper amount of water, mixing and pelletizing, enabling the materials to generate a series of physical and chemical changes on sintering equipment, sintering the materials into blocks, and conveying the blocks to a blast furnace for the next working procedure. How to effectively reduce the dosage of solid fuel in the sintering process and reduce CO generated in the generation process has been all the time 2 The energy-saving and emission-reducing effects are achieved, and the method is a problem which is always concerned and concerned by technical personnel in the steel industry.
After the pulverized coal of the upper material layer is ignited in the sintering process, the combustion heat release is used for sintering nearby raw materials, and the self-heat-storage effect in the air draft type operation production enables the heat of the upper part to be brought into the lower material layer by gas to participate in the sintering of the lower material layer. Therefore, the heat required by the material layers from top to bottom is gradually reduced, segregation material distribution is adopted during material distribution, the coal powder distribution amount on the upper material layer is large, and the coal powder distribution amount on the lower material layer is small, so that the quality index of a finished product can be greatly improved under the same fuel consumption index, or the fuel consumption index can be greatly reduced under the same finished product quality index, and the purposes of saving energy and reducing carbon emission are achieved.
However, due to the limitation of the device technology, the strict ideal layered segregation type fuel distribution is difficult to realize in the actual industrial production of the sintering plant, and the owners have to distribute the solid fuel according to the high value of the theoretical required fuel quantity in each layer. The problem that the upper material layer heat is insufficient and the middle and lower material layers are excessive can be caused in the sintering material layer during sintering production, the lower sintering material is easy to melt, and the like, so that energy and resource waste is finally caused, and the generation of smoke pollutants is greatly intensified.
Patent CN200980148879.1 proposes a method for supplementing heat to sinter bed by using liquid fuel. Specific liquid fuel is atomized to a required size (below 100 mu m) and then sprayed to a region at a certain distance behind an ignition furnace, small liquid particles volatilize on the surface of a material layer and enter the material layer along with sintering air draft, and heat is supplied by combustion in the sintering material layer, so that the width of a high-temperature belt of the sintering material layer during production is widened, the temperature time of the sintering ore at 1200-1400 ℃ is prolonged, and the strength of the sintering ore and the proportion of the sintering ore at 5-10 mm can be improved. Meanwhile, when the liquid fuel is used for supplementing the missing heat at the upper part of the material layer, the solid fuel proportion of the material layer needs to be reduced integrally to prevent the excessive heat of the material layer at the lower part, so that the use amount of solid carbon and CO in the production of sintered ore can be reduced 2 And (4) discharging the amount.
Based on this, the liquid fuel injection process and the device thereof in the prior art still have some problems:
1. liquid fuels are difficult to settle after atomization to a particular size. Patent CN200980148879.1 indicates that fuel needs to be atomized to below 100 μm, and the contact specific surface area of liquid fuel particles and air is increased to ensure that fuel can be volatilized in time and carried into the material layer. However, the liquid particles below 100 μm are hindered from falling freely due to the non-negligible air buoyancy when they settle, and are difficult to completely and rapidly settle to the surface of the sintering material layer only due to the gravity and the micro negative pressure on the surface of the sintering material layer, and are also susceptible to the influence of unstable air flow, dust generated on the sintering material surface, and the like, and the failure of timely settling of fuel droplets easily causes the untimely heat compensation inside the material layer, which affects the quality of the sintered ore, and is also one of the potential safety hazards.
2. Liquid fuel atomizers are prone to clogging. The requirement on an atomization component for atomizing the liquid fuel to be below 100 mu m is particularly high, the atomization component needs to uniformly and unimpededly spray the fuel to the surface of a sintering material layer while ensuring the qualified particle size of the sprayed liquid fuel, in the actual operation process, dust, instability and the like in a production workshop bring great difficulty to fuel atomization, and meanwhile, the aperture of an atomization device is extremely small, the blockage probability is high, and the smooth operation of equipment is influenced. The liquid fuel only depends on free evaporation, the evaporation speed is difficult to control, and residues are easy to form.
3. Fire extinguishing gas (nitrogen, steam and the like) needs to be synchronously sprayed on the surface of the liquid fuel, and the fire extinguishing gas can deteriorate the combustion environment of the solid fuel and influence the sintering speed and the yield and quality indexes. In the prior art, in order to prevent liquid fuel sprayed on the surface of a sintering material layer from igniting on the surface of the material layer, fire extinguishing gas needs to be sprayed on the surface of the material layer, the fire extinguishing gas can enter the material layer along with sintering air draft, and combustion improver O in gas in the material layer is reduced 2 The concentration of the solid fuel (coal powder and coke) reduces the burning speed of the solid fuel, reduces the downward moving speed of a burning zone in sintering, prolongs the sintering time and leads to the reduction of the yield of a sintering machine; meanwhile, the reduction of the combustion speed of the solid fuel can influence the internal temperature distribution of a sinter bed, the peak temperature is reduced, and the reduction of the quality of sinter due to the over-low peak temperature and insufficient sintering liquid phase is easy to occur. The liquid fuel is volatilized to enter the material layer for combustion, and the position of the liquid fuel is above the solid fuel combustion zone, so that oxygen in gas in a part of sintering material layers can be consumed, the condition of 'robbing' the oxygen required by the combustion of the solid fuel is formed, and the combustion environment of the solid fuel is further deteriorated.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a multi-stage liquid fuel concurrent heating coupling hot air sintering method and a device thereof. The invention aims to solve the problems of difficult atomization, untimely volatilization, deterioration of an original sintering zone and the like in the liquid fuel auxiliary sintering process, obtain a better fuel supplement effect and realize the emission reduction and quality improvement effects of sintering production.
The invention provides a method for controlling the sintering temperature of a sintering machine, which comprises the steps of sequentially dividing a liquid fuel injection section on the sintering machine into a plurality of fuel injection sections along the running direction of a sintering machine trolley, respectively injecting different types of liquid fuels to the sintering mixture material surface in each fuel injection section according to the different heat required by a sintering material layer at the corresponding position of each fuel injection section, introducing a heat medium (such as hot air in processes of a circular cooler and the like) with the temperature matched with the boiling point of the injected liquid fuel, heating and vaporizing the injected liquid fuel through the heat medium to form liquid fuel steam, mixing the vaporized liquid fuel steam with the heat medium, feeding the mixture into the sintering material layer in each fuel injection section, combusting and releasing heat, thereby supplementing the heat required by sintering of an upper material layer. The invention adopts hot air from processes of a circular cooler and the like to heat and vaporize the liquid fuel sprayed on the sintering charge level, ensures the timely evaporation of the liquid fuel, further ensures the timely supplement of the liquid fuel to the heat in the charge level, and realizes multiple effects of waste heat utilization, sinter quality improvement, solid fuel consumption reduction and the like.
According to a first embodiment of the invention, a multi-stage liquid fuel concurrent heating coupled hot air sintering method is provided.
A multi-section liquid fuel concurrent heating coupling hot air sintering method comprises the following steps:
1) The liquid fuel injection section is arranged on the sintering machine, the liquid fuel injection section is sequentially divided into a plurality of fuel injection sections along the running direction of the sintering machine trolley, and each fuel injection section respectively injects liquid fuel to the sintering mixture charge level at the corresponding position in the sintering machine trolley.
2) And respectively introducing a heat medium into each fuel injection section, and heating and vaporizing the liquid fuel injected on the sintering material surface by the heat medium to form liquid fuel vapor.
3) The mixed gas of liquid fuel steam and heat medium in each fuel injection section enters the sintering material layer to be combusted and heat supplied to assist sintering.
In the present invention, the number of stages of the fuel injection stage is set to N. Along the running direction of a sintering pallet, the liquid fuel injection section is sequentially divided into a1 st fuel injection section, a2 nd fuel injection section, a \8230a8230a Nth fuel injection section, and the boiling points of the liquid fuels correspondingly injected in each fuel injection section are sequentially T b1 ，T b2 ……T bN . Wherein, T b1 ＞T b2 ＞……＞T bN 。
Preferably, along the running direction of the sintering machine trolley, the temperature of the heat medium correspondingly introduced into each fuel injection section is sequentially T h1 ，T h2 ……T hN . Wherein, T h1 ＞T h2 ＞……＞T hN 。
Preferably, in step 3), the temperature target value of the mixed gas of the liquid fuel vapor and the heat medium in the ith fuel injection stage is T Let i 。T Let i The range of (a) is 80 to 500 ℃, preferably 100 to 400 ℃, and more preferably 120 to 300 ℃.
Preferably, the method for calculating and adjusting the amount of the heat medium required to be introduced into the ith fuel injection section according to the fact that the heat quantity absorbed by the liquid fuel injected to the sintering charge surface by the ith fuel injection section is equal to the heat quantity released by the heat medium correspondingly introduced into the ith fuel injection section specifically comprises the following substeps:
during the vaporization of the liquid fuel by heating, the heat absorbed by the liquid fuel is calculated: detecting an initial temperature T of the liquid fuel Liquid for treating urinary tract infection The total amount of liquid fuel injected to the sinter mix charge level at the position corresponding to the ith fuel injection section is M Solution i The temperature of the mixed gas of the liquid fuel vapor and the heat medium in the ith fuel injection section is T Let i Thereby, the heat quantity Q absorbed by vaporization of the liquid fuel injected in the i-th fuel injection section is calculated Solution i . The method comprises the following steps:
Q liquid i ＝C Liquid for medical purpose M Liquid i (T Steaming machine -T Liquid for treating urinary tract infection )+M Liquid i r Liquid for treating urinary tract infection +C Steam generator M Steam i (T Let i -T Steaming machine )…………(1)。
In the formula: c Liquid for treating urinary tract infection Is the specific heat capacity of the liquid fuel. T is Steaming machine Is the boiling point of the liquid fuel. r is Liquid for medical purpose Is the heat of vaporization of the liquid fuel. C Steam generator Is the specific heat capacity of the liquid fuel vapor. M is a group of Steam i Total amount of liquid fuel vapor in ith fuel injection stage, M Steam i ＝M Solution i 。
During the vaporization of the liquid fuel by heating, the heat released by the thermal medium is calculated: detecting the initial temperature T of the introduced heat medium Heat generation The temperature of the mixed gas of the liquid fuel vapor and the heat medium in the ith fuel injection section is T Let i Thus, the heat quantity Q released by the heat medium introduced into the ith fuel injection section in the process of heating the vaporized liquid fuel is calculated Heat i . The method comprises the following steps:
Q heat i ＝C Heat generation M Heat i (T Heat generation -T Let i )＝C Heat generation V Heat i ρ Heat generation (T Heat generation -T Let i )…………(2)。
In the formula: c Heat generation Is the specific heat capacity of the thermal medium. M is a group of Heat i The mass of the heating medium required to be introduced into the ith fuel injection section. V Heat i The volume of heat medium required for the ith fuel injection stage. Rho Heat generation Is the density of the thermal medium.
According to the principle of heat balance, in the process of heating and vaporizing the liquid fuel, the heat absorbed by the liquid fuel is equal to the heat released by the heat medium, namely:
Q liquid i ＝Q Heat i …………(3)。
The quantity V of the heat medium required to be introduced into the ith fuel injection section Heat i Comprises the following steps:
each fuel injection section is provided with a hot air cover, each hot air cover is provided with a heat medium pipeline, and heat media are respectively introduced into the corresponding hot air cover through each heat medium pipeline; the opening degree of a flow valve on a heat medium pipeline of the ith fuel injection section is adjusted to ensure that the quantity of the heat medium introduced into the hot air cover is V Heat i 。
In the present invention, in the sub-step, the total amount M of the liquid fuel injected to the sinter mix level at the position corresponding to the ith fuel injection stage Liquid i Comprises the following steps:
in the formula: h Liquid for treating urinary tract infection Calorific value per unit mass, M, of liquid fuel injected for the ith fuel injection section Material i The total amount of the sintering mixture Q needing liquid fuel heat compensation in the ith fuel injection section in unit time along the height direction of a material layer Material i In order to integrally reduce the heat quantity, Q, needed to be supplemented to the sintering raw material per unit mass in the ith fuel injection section after the solid fuel is proportioned Material i The type of sintering raw materials of the ith fuel injection section, the average particle size of the sintering mixture and the solid fuel proportion of the sintering mixture.
In the present invention, the hot air hoods of the respective fuel injection stages are provided with first temperature detection devices, respectively. The first temperature detection device positioned in the ith fuel injection section detects the mixed gas temperature T of the liquid fuel steam and the heat medium in the hot air cover of the ith fuel injection section in real time i . Comparing the actual temperature T detected in the i-th fuel injection section i And a target temperature value T Let i . If T i ＝ T Let i The device continues to operate. If T i ≠T Let i Adjusting the temperature and/or the amount of the heat medium flowing into the hot air hood from the ith fuel injection section to ensure that T is equal to i ＝T Let i 。
Preferably, if T i >T Let i Reducing the temperature of the heat medium introduced into the hot air hood by the ith fuel injection section, or reducing the opening degree of a flow valve on a heat medium pipeline of the ith fuel injection section, so as to reduce the amount of the heat medium introduced into the hot air hood, or simultaneously adjusting the amount and the temperature of the heat medium introduced into the hot air hood by the ith fuel injection section, so that T is the temperature i ＝T Let i 。
If T i <T Let i Increasing the temperature of the heat medium introduced into the hot air hood by the ith fuel injection section, or increasing the opening degree of a flow valve on a heat medium pipeline of the ith fuel injection section, so as to increase the amount of the heat medium introduced into the hot air hood, or simultaneously adjusting the ith fuelThe amount and the temperature of the heat medium which is introduced into the hot air hood at the injection section are enabled to be T i ＝T Let i 。
In the present invention, the boiling point of the liquid fuel is 15 to 500 ℃, preferably 25 to 380 ℃, and more preferably 50 to 250 ℃. Preferably, the liquid fuel injected in each fuel injection section is one or more of biodiesel, aviation kerosene, gasoline, alcohol liquid fuel and alkane liquid fuel.
In the present invention, the initial temperature of the heat medium when it is introduced into the hot air hood is 100 to 550 ℃, preferably 120 to 400 ℃, and more preferably 150 to 300 ℃. Preferably, the heat medium is hot air.
According to a second embodiment of the invention, a multi-stage liquid fuel concurrent heating coupling hot air sintering device is provided.
The device comprises a sintering machine trolley, wherein a liquid fuel injection section is arranged on the sintering machine trolley. The liquid fuel injection section is divided into a plurality of fuel injection sections in sequence along the running direction of the sintering machine trolley. Each fuel injection section is respectively provided with a hot air cover and a liquid fuel injection device. The hot air cover is arranged at the upper part of the sintering machine trolley. The liquid fuel injection device comprises a liquid fuel main pipe and a liquid fuel branch pipe. The liquid fuel main pipe is arranged outside the hot air cover. One end of the liquid fuel branch pipe is connected with the liquid fuel main pipe, the other end of the liquid fuel branch pipe extends into the hot air cover, and a fuel nozzle is arranged at one end extending into the hot air cover. The hot air cover of each fuel injection section is also provided with a heat medium pipeline which is communicated with the inner space of the hot air cover.
In the present invention, the liquid fuel injection device further includes a liquid fuel pool in each fuel injection section. The liquid fuel pool is arranged in the hot air cover. The end of the liquid fuel branch pipe provided with the fuel nozzle is connected with the liquid fuel pool, and the liquid fuel branch pipe extends into or leads to the liquid fuel pool. The bottom of the liquid fuel pool is provided with a fuel injection hole.
Preferably, the side wall of the liquid fuel pool is also provided with fuel injection holes. Preferably, the side walls of the liquid fuel branch pipes extending into the liquid fuel pool are simultaneously provided with fuel circulation holes.
Preferably, in each fuel injection section, the liquid fuel injection device further includes a drive device. The driving device is arranged on the liquid fuel pool and drives the liquid fuel pool to rotate around the liquid fuel branch pipe. Preferably, the connection position of the liquid fuel branch pipe and the liquid fuel pool is located on the central axis of the liquid fuel pool.
In the present invention, in each fuel injection section, the liquid fuel injection device further includes a separator provided in the liquid fuel pool. The baffle is located between the outer wall of liquid fuel branch pipe and the inner wall in liquid fuel pool, and the baffle is connected with the bottom in liquid fuel pool. The partition plate divides an inner space of the liquid fuel pool into a plurality of regions.
Preferably, the height of the partition plate is smaller than the height of the liquid fuel pool. Preferably, the ratio of the height of the partition plate to the height of the liquid fuel pool is 0.1-0.9:1, preferably 0.2 to 0.8:1, more preferably 0.3 to 0.6:1.
in the invention, in each liquid fuel pool, the number of the partition plates is z, and the z partition plates are uniformly distributed in a radial shape along the peripheral direction of the liquid fuel pool by taking the liquid fuel branch pipe as the center. The z-block partition plate divides the inner space of the liquid fuel pool into z areas, and a plurality of fuel injection holes which are uniformly distributed are arranged at the bottom and on the side wall of the liquid fuel pool corresponding to each area.
Preferably, 2. Ltoreq. Z.ltoreq.30, preferably 3. Ltoreq. Z.ltoreq.20, more preferably 4. Ltoreq. Z.ltoreq.15.
In the present invention, 1 to 100 liquid fuel branch pipes, preferably 2 to 80 liquid fuel branch pipes, and more preferably 3 to 50 liquid fuel branch pipes are connected to the liquid fuel header pipes of the respective liquid fuel injection devices. Preferably, the spacing between each two adjacent liquid fuel branch pipes is equal. Each liquid fuel branch pipe is provided with a fuel nozzle. One end of each liquid fuel branch pipe, which is provided with a fuel nozzle, is connected with a liquid fuel pool. And each liquid fuel pool is correspondingly provided with a driving device.
The term "equal distance between every two adjacent liquid fuel branch pipes" as used herein means that the distance between every two adjacent liquid fuel branch pipes is equal in each liquid fuel branch pipe in the same liquid fuel injection device; that is, in each liquid fuel branch pipe connected to the same liquid fuel main pipe, the distance between every two adjacent liquid fuel branch pipes is equal.
In the present invention, the apparatus further comprises a first temperature detection means. The hot air cover of each fuel injection section is provided with a first temperature detection device. The first temperature detection device extends into the hot air cover. Preferably, the first temperature detecting device is arranged at the lower part of the hot air hood, namely at the position on the hot air hood close to the sintering charge level.
Preferably, a plurality of first temperature detection devices are uniformly arranged at the lower part of each hot air cover. Preferably, the first temperature detection device is a thermocouple.
Preferably, each of the heat medium pipes is provided with a second temperature detection device. Preferably, each heat medium pipeline is also provided with a flow valve.
Preferably, the liquid fuel manifold of each of the liquid fuel injection devices is provided with a third temperature detection device.
The invention provides a multistage liquid fuel concurrent heating coupling hot air sintering method, aiming at the problems of high atomization difficulty, difficult sedimentation after atomization, fire extinguishing gas spraying on the surface of the sprayed liquid fuel and the like in the method for concurrent heating sintering of a material layer by adopting liquid fuel in the prior art. The method includes the steps that a liquid fuel injection section on a sintering machine is sequentially divided into a plurality of fuel injection sections along the running direction of a trolley of the sintering machine, different types of liquid fuels are respectively injected to sintering mixture material surfaces in the fuel injection sections according to the different heat quantity needed by a sintering material layer at the corresponding position of each fuel injection section, a heat medium (such as hot air of processes of a circular cooler and the like) with the temperature matched with the boiling point of the injected liquid fuel is introduced, the injected liquid fuel is heated and vaporized through the heat medium to form liquid fuel steam, the vaporized liquid fuel steam and the heat medium are mixed to enter the sintering material layers in the fuel injection sections to burn and release heat, and then the heat quantity needed by sintering of an upper material layer is supplemented. Compared with the prior art that the liquid fuel sprayed on the sintering material surface is vaporized by depending on the sensible heat of the sintering material layer after being sprayed or the sprayed liquid fuel directly permeates into the sintering material layer in a liquid state, the invention obviously introduces hot air to heat the liquid fuel sprayed on the sintering material surface, thereby promoting the vaporization of the liquid fuel; and the temperature of the introduced hot air is matched with the boiling point of the injected liquid fuel, namely, the introduction of the hot air enables the evaporation and boiling of the liquid fuel to be carried out simultaneously, so that the vaporization speed is further increased, therefore, the volatilization speed of the injected liquid fuel is higher, the timely evaporation of the liquid fuel can be ensured, the liquid fuel enters a sinter bed for combustion and heat supplement, and the timely supplement of the liquid fuel to the heat in the bed is further ensured. On the contrary, the liquid fuel sprayed in the prior art only depends on free evaporation, the evaporation speed is slow, if the evaporation is not timely, the liquid fuel can be caused to form residues at the set evaporation position, and then the heat at the set position in the sintering material layer is insufficient, and the sintering production quality is influenced.
It should be noted that, because of the self-heat storage effect of the material layer during the air draft sintering process, the heat quantity provided by the liquid fuel required by the sintering material layer at the corresponding position of each fuel injection segment is gradually reduced along the running direction of the sintering pallet. Meanwhile, in the sintering process, an ignition burner in an ignition furnace ignites the sintering charge level to ignite the solid carbon fuel on the surface of the sintering charge level to form a combustion zone in the early stage; after the sintering charge level moves out of the ignition furnace, it is cooled by ambient air, so that the closer the sintering charge level is to the ignition furnace, the higher the temperature thereof. Based on the above, in consideration of various factors such as safe production and utilization of sensible heat of the charge level, in the invention, along the running direction of the sintering machine trolley, the boiling points of the liquid fuels correspondingly injected in each fuel injection section are sequentially reduced, and correspondingly, the temperature of the heat medium correspondingly introduced in each fuel injection section is sequentially reduced. Because the liquid fuel injection section is arranged on the sintering machine and is positioned at the downstream of the ignition section, namely the boiling point of the liquid fuel injected by the fuel injection section close to the end of the ignition section is higher than that of the liquid fuel injected by the fuel injection section far away from the end of the ignition section, and the temperature of the heat medium introduced by the fuel injection section close to the end of the ignition section is higher than that of the heat medium introduced by the fuel injection section far away from the end of the ignition section. The invention adopts the heat compensation of various liquid fuels and the evaporation auxiliary sintering of multiple sections of hot air, and in the actual production, the invention can reasonably configure the number, the length and the like of the fuel injection sections according to the types of the on-site liquid fuels and the distribution of the hot air temperature sections, thereby realizing the technical effect of the composite heat compensation of various liquid fuels, and simultaneously, the hot air with different temperatures can be utilized in a cascade way, and particularly, the hot air with lower temperature and difficult sensible heat recovery can also be reasonably utilized. The invention realizes waste heat utilization of hot waste gas in processes of circular coolers of steel plants and the like so as to obtain better liquid fuel heat supplementing effect and further realize emission reduction and quality improvement effects of sintering production. For example, in the production process, the liquid fuel injection section is segmented according to the type of liquid fuel available on site, the temperature of hot air and the like, and can be divided into a plurality of fuel injection sections (for example, into 4 sections); the liquid fuel can be selected from biodiesel refined by recovering kitchen waste grease, the boiling point of the liquid fuel is 300-350 ℃, the burning point is generally above 500 ℃, hot air above 300 ℃ can be input from the spraying section in a matching manner, and the liquid fuel is generally arranged in the spraying section near the ignition furnace; the boiling point of liquid fuel such as aviation kerosene is generally in the range of 150-280 ℃, the spontaneous combustion temperature is above 400 ℃, and the liquid fuel can be matched with hot air of 250-300 ℃ to be input from a spraying section and can be arranged behind a biodiesel input section; the liquid fuel can be selected from gasoline, alcohol and alkane liquid fuel, the boiling point is generally low, the liquid fuel can be completely evaporated at normal temperature or 100 ℃, and the liquid fuel can be supplemented with hot air with low temperature (about 150 ℃) when being input; and then the matching of the boiling point of the liquid fuel and the temperature of the hot air is realized, the technical effect of composite heat compensation of various liquid fuels is achieved, and the cascade utilization of the hot air in different temperature sections is realized.
In addition, the invention introduces hot air from processes of a steel plant circular cooler and the like into sintering, not only can play a role of heating vaporized liquid fuel, but also can improve the upper sintering temperature, increase the sintering liquid phase and be beneficial to fully crystallizing minerals, reduce the content of glass phase, thereby improving the yield of the whole sintering and the strength of sintered ore. The hot air replaces cold air, so that the temperature difference between the pumped air and the hot sintering layer is reduced, the cooling speed is reduced, the thermal stress is reduced, and the strength of the sintered ore is improved. The hot air sintering is coupled with the liquid fuel heat supplement, the liquid fuel is evaporated by utilizing the sensible heat of the hot air, and multiple effects of utilizing waste heat, improving the quality of sintered ore, reducing the consumption of solid fuel and the like are realized.
In the present invention, the mixed gas of the liquid fuel vapor and the heat medium introduced into the bed flows to the lower side of the sintering pallet along with the air, and is ignited and burned after contacting the combustion zone, thereby releasing heat to the surrounding bed, as shown in fig. 3. The sintering machine trolley is internally provided with a sintering ore belt, a combustion belt, a drying preheating belt, an over-wet belt and an original material belt from top to bottom in sequence along the thickness direction of a material layer. The liquid fuel steam is combusted near the combustion zone to release heat, so that the temperature time of 1200-1400 ℃ in the material layer can be effectively prolonged, the liquid phase crystallization cooling rate of the nearby material layer can be reduced, the strength of the sinter and the porosity of 5-10 mm can be effectively enhanced while heat is supplemented to the material layer, and the effect of improving the quality is achieved. The method integrally reduces the amount of solid carbon fuel in the material layer, and directly reduces the nitrogen element content of the solid fuel, so that the concentration of fuel type NOx in the sintering flue gas is reduced, and the effect of emission reduction is achieved.
In the multi-stage liquid fuel concurrent heating coupling hot air sintering method, the liquid fuel sprayed on the sintering material surface exchanges heat with the heat medium introduced into the hot air cover, and the liquid fuel is heated and vaporized to form liquid fuel steam. According to the heat balance principle, in the process that the liquid fuel injected by the ith fuel injection section is heated and vaporized by the heat medium, the heat Q absorbed by the liquid fuel Solution i With heat Q released by the thermal medium Heat i Equality, i.e. the temperature target value T required to be reached according to equations (3) to (4) in combination with the mixed gas of the liquid fuel vapor and the heat medium in the ith fuel injection section hot air hood Let i To calculate the thermal medium required to be introduced into the hot air hood for the ith fuel injection sectionQuantity V Heat i Then, the opening degree of a flow valve on a heat medium pipeline of the ith fuel injection section is adjusted, so that the quantity of the heat medium introduced into the hot air cover is the calculated quantity V Heat i . And the temperature of the mixed gas of the liquid fuel steam and the heat medium in the hot air cover is detected in real time by a first temperature detection device arranged on the hot air cover of the ith fuel injection section. The temperature T of the mixed gas of the liquid fuel vapor and the heat medium of the ith fuel injection section is detected in real time i Temperature target value T of mixed gas of liquid fuel vapor and heat medium in ith fuel injection section Let i Comparing, and adjusting corresponding sintering parameters, such as temperature and/or amount of heat medium introduced into the hot air hood by the ith fuel injection segment i ＝T Let i Thereby ensuring that the temperature in the hot air cover is proper and the heat-supplementing sintering is in a normal working condition state.
In the invention, the temperature target value T of the mixed gas of the liquid fuel steam and the heat medium in the hot air hood of the ith fuel injection section Let i The range of (a) is 80 to 500 ℃, preferably 100 to 400 ℃, and more preferably 120 to 300 ℃. If T i ＝T Let i That is, the actual temperature of the mixed gas of the liquid fuel vapor and the heat medium in the hot air hood of the ith fuel injection segment is within the range of the target temperature value, which indicates that the temperature in the hot air hood of the ith fuel injection segment is controlled within the normal range at this moment, the current sintering parameters (such as the temperature of the introduced heat medium, the amount of the heat medium and the like) are proper, and the device can continue to operate. If T i ＜T Let i Explaining that the temperature in the hot air hood of the ith fuel injection segment is low at present, the problem of fuel waste and insufficient sintering heat compensation easily occurs due to untimely evaporation and vaporization of liquid fuel, and the sintering parameters at this moment need to be adjusted, for example, the temperature of the heat medium introduced into the hot air hood by the ith fuel injection segment is increased, or the opening degree of a flow valve on a heat medium pipeline of the ith fuel injection segment is increased, so that the quantity of the heat medium introduced into the hot air hood is increased, or the quantity and the temperature of the heat medium introduced into the hot air hood by the ith fuel injection segment are adjusted simultaneously, so that T is i ＝T Let i And further controlling the temperature in the hot air hood of the ith fuel injection section to return to the normal range. If T i >T Let i If the temperature of the heat medium flowing into the hot air hood of the ith fuel injection section is abnormal, the liquid fuel steam may catch fire above the charge level, and the temperature of the heat medium flowing into the hot air hood of the ith fuel injection section needs to be reduced, or the opening degree of a flow valve on a heat medium pipeline of the ith fuel injection section needs to be reduced, so that the quantity of the heat medium flowing into the hot air hood is reduced, or the quantity and the temperature of the heat medium flowing into the hot air hood of the ith fuel injection section are simultaneously adjusted, so that T is equal to T i ＝T Let i And further controlling the temperature in the hot air cover of the ith fuel injection section to return to the normal range. Furthermore, if the actual temperature in the hot air hood of the ith fuel injection section is detected to be higher than the target temperature value, the liquid fuel steam in the fuel injection section is judged to be ignited above the charge level, the injection position and the injection direction of the liquid fuel can be optimally adjusted besides the temperature of the introduced heat medium and the amount of the heat medium, and the injection or the less injection of the liquid fuel can be temporarily stopped for the ignited position. In addition, the type of the liquid fuel injected in the fuel injection section can be adjusted, so that the vaporization heat and the specific heat capacity of the liquid fuel are changed, the heat absorbed by the liquid fuel is adjusted, the temperature in the hot air cover is controlled to return to the normal range, and potential safety hazards are eliminated.
It should be noted that, a plurality of first temperature detection devices are uniformly arranged on the hot air cover of each fuel injection section, the plurality of first temperature detection devices detect the temperature of each area in the hot air cover in real time, and when the actual temperature in the hot air cover deviates from the target temperature value, corresponding measures are immediately taken for adjustment. Due to the fact that real-time monitoring and temperature regulation are timely, the situation that fire happens due to high temperature abnormity in the hot air cover is less, and the safety and the reliability of the multi-section liquid fuel concurrent heating coupling hot air sintering method are guaranteed. Based on the method, the fire extinguishing gas is not required to be sprayed on the sintering charge surface to ensure the production safety, so that the problems that the fire extinguishing gas deteriorates the solid fuel combustion environment and reduces the quality index of the sintered mineral product caused by spraying the fire extinguishing gas in the prior art are solved.
In the invention, the total amount of liquid fuel required to be injected by the sinter mixture in the ith fuel injection stage
In the formula: h Liquid for medical purpose Specific heat value of liquid fuel injected for i-th fuel injection section, M Material i The total amount of the sintering mixture Q needing liquid fuel heat compensation in the ith fuel injection section in unit time along the height direction of a material layer Material i In order to integrally reduce the heat quantity, Q, needed to be supplemented to the sintering raw material per unit mass in the ith fuel injection section after the solid fuel is proportioned Material i The type of sintering raw materials of the ith fuel injection section, the average particle size of the sintering mixture and the solid fuel proportion of the sintering mixture. Based on this, it can be seen from the equation that the total amount of the liquid fuel to be injected into the sinter mix in the i-th fuel injection stage is related to the mass of the sinter mix in the i-th fuel injection stage region, the kind of the sintering material, the average particle size of the sinter mix, the solid fuel ratio of the sinter mix, and the like.
In the present invention, the type of the liquid fuel injected to the sintering charge level is not limited, and the liquid fuel may be a mixed fuel composed of a plurality of liquid fuels, such as biodiesel, aviation kerosene, gasoline, alcohol liquid fuel, alkane liquid fuel, and the like. The liquid fuel has a boiling point of 15 to 500 ℃, preferably 25 to 380 ℃, and more preferably 50 to 250 ℃. Accordingly, the initial temperature of the heat medium introduced into the hot air hood in the present invention is matched with the boiling point of the liquid fuel, for example, the initial temperature of the heat medium is 100 to 550 ℃, preferably 120 to 400 ℃, and more preferably 150 to 300 ℃. The type or source of the heat medium is not limited, and the purpose of the concurrent heating coupled sintering according to the present invention can be achieved by using a liquid fuel, and the heat medium is, for example, hot air from a steel plant circular cooler process.
Correspondingly, the invention also provides a multi-section liquid fuel concurrent heating coupling hot air sintering device for the method. The device comprises a sintering machine trolley, wherein a liquid fuel injection section is arranged on the sintering machine trolley and is positioned at the downstream of an ignition section. The liquid fuel injection section is sequentially divided into a plurality of fuel injection sections along the running direction of the sintering machine trolley. Each fuel injection section is provided with a hot air cover, and each hot air cover is provided with a liquid fuel injection device. The hot air cover is arranged at the upper part of the sintering machine trolley and is positioned at the downstream of the ignition device. The liquid fuel injection device comprises a liquid fuel main pipe and a liquid fuel branch pipe. The liquid fuel main pipe is arranged on the outer side of the hot air cover, one end of the liquid fuel branch pipe is connected with the liquid fuel main pipe, the other end of the liquid fuel branch pipe extends into the hot air cover, and a fuel nozzle is arranged at the end extending into the hot air cover. The hot air hood is also provided with a heat medium pipeline, and the heat medium pipeline extends into or leads to the hot air hood, namely the heat medium pipeline is communicated with the inner space of the hot air hood. When the device is operated, different types of liquid fuels are respectively injected to the sintering mixture charge level at the corresponding position of each fuel injection section from the fuel nozzle at one end of the liquid fuel branch pipe through the liquid fuel main pipe and the liquid fuel branch pipe of the liquid fuel injection device arranged in each fuel injection section. Meanwhile, heat media (such as hot air from a circular cooler) in different temperature sections are respectively introduced into the hot air hood through heat medium pipelines arranged in the fuel injection sections, and the liquid fuel injected on the sintering charge surface by the fuel injection sections is heated and vaporized by the heat media to form liquid fuel steam. The mixed gas of the liquid fuel steam and the heat medium (namely the heat medium which exchanges heat with the liquid fuel and is cooled) enters the sintering material layer to be combusted and supplied with heat under the action of the air draft negative pressure, so that the heat required by sintering of the upper material layer is supplemented, and the sintering is assisted. The invention adopts hot air from processes of a circular cooler and the like to heat and vaporize the liquid fuel sprayed on the sintering material surface, and the hot air introduced into the hot air cover heats the liquid fuel sprayed on the sintering material surface, thereby promoting the vaporization of the liquid fuel and accelerating the vaporization speed, so that the volatilization speed of the sprayed liquid fuel is high, the liquid fuel can be ensured to be evaporated in time and enter the sintering material layer to be combusted for heat supplement, and the timely supplement of the liquid fuel to the heat in the material layer is further ensured. The invention divides the liquid fuel injection section into a plurality of fuel injection sections, and each fuel injection section is correspondingly provided with the hot air cover, the liquid fuel injection device and the heat medium pipeline, thereby realizing the heat compensation of various liquid fuels and the auxiliary sintering of multi-section hot air evaporation.
Preferably, the liquid fuel injection device provided in each fuel injection section according to the present invention further includes a liquid fuel pool. The liquid fuel pool is arranged in the hot air cover and is positioned at the lower part of one end of the liquid fuel branch pipe, which is provided with the fuel nozzle. The liquid fuel manifold extends into or opens into the liquid fuel pool and is connected to the liquid fuel pool (e.g., via a bearing). The bottom (namely the bottom wall) of the liquid fuel pool is uniformly provided with a plurality of fuel injection holes. When the device is operated, different types of liquid fuels respectively flow in from the liquid fuel main pipe of the liquid fuel injection device of each fuel injection section, flow into the liquid fuel pool from the fuel nozzle at the end part of the liquid fuel branch pipe through the liquid fuel branch pipe, and the liquid fuel entering the liquid fuel pool is uniformly injected to the sintering charge level from the fuel injection hole at the bottom under the action of gravity, so that the material bed heat supplementing requirement is met. Preferably, a plurality of fuel injection holes are uniformly distributed on the side wall of the liquid fuel pool. Correspondingly, the side wall of the part of the liquid fuel branch pipe extending into the liquid fuel pool is synchronously provided with fuel circulation holes. The liquid fuel can flow into the liquid fuel pool through the fuel nozzle at the end part and the fuel flow through hole at the side part, and the liquid fuel entering the liquid fuel pool can be uniformly sprayed onto the sintering material surface from the fuel spray hole at the bottom part and can also be uniformly sprayed from the fuel spray hole on the side wall.
Further preferably, a driving device is further arranged on the liquid fuel pool. The liquid fuel pool is connected with the liquid fuel branch pipe (through a bearing), and under the driving of the driving device, the liquid fuel pool rotates around the liquid fuel branch pipe at a certain speed, so that part of liquid fuel in the liquid fuel pool is uniformly sprayed out from the fuel spray holes at the bottom under the action of gravity, and meanwhile, the liquid fuel can also uniformly pass through the fuel spray holes in the side wall at a certain speed under the action of centrifugal force, thereby ensuring that the liquid fuel sprayed out from the liquid fuel pool can be uniformly sprayed to a sintering material surface and radiated to a larger range. In the present invention, in order to further promote the uniform injection of the liquid fuel, the connection position of the liquid fuel branch pipe and the liquid fuel pool is located on the central axis of the liquid fuel pool.
The liquid fuel injection apparatus further includes a separator disposed within the liquid fuel cell. The baffle plate is positioned between the outer wall of the liquid fuel branch pipe and the inner wall of the liquid fuel pool, and the baffle plate is connected with the bottom (namely the bottom wall) of the liquid fuel pool. The partition plate divides an inner space of the liquid fuel pool into a plurality of regions. In the invention, the height of the partition plate is less than that of the liquid fuel pool, when the liquid fuel pool rotates along with the driving device, a part of liquid fuel can be limited between the two partition plates, so that enough tangential force is provided for the liquid fuel, and the rotating speed of the liquid fuel is increased, so that the liquid fuel can pass through the fuel injection hole on the side wall of the liquid fuel pool at a certain speed under the action of centrifugal force. Generally, the ratio of the height of the partition plate to the height of the liquid fuel pool is 0.1 to 0.9:1, preferably 0.2 to 0.8:1, more preferably 0.3 to 0.6:1, for example, the height of the partition plate is 1/3 of the height of the liquid fuel pool. The number of the separators is not limited, and the number z of the separators may range from 2 to 30, preferably from 3 to 20, and more preferably from 4 to 15, for example. The z-block partition plates are radially and uniformly distributed along the peripheral direction of the liquid fuel pool by taking the liquid fuel branch pipe as the center, so that the internal space of the liquid fuel pool is uniformly divided into z areas by the z-block partition plates. The shape of the liquid fuel pool is not limited, and when the liquid fuel pool is circular, the z partition plates uniformly divide the inner space of the liquid fuel pool into z sectors. And a plurality of fuel injection holes which are uniformly distributed are arranged at the bottom and the side wall of the liquid fuel pool corresponding to each area. The arrangement of the fuel injection holes in the corresponding areas is not limited, and the uniform distribution is met, so that the uniform injection of the liquid fuel can be realized. For example, a plurality of fuel injection holes are arranged in a straight line at equal intervals on the bottom and the side wall in each region of the liquid fuel pool.
In the present invention, a plurality of liquid fuel branch pipes are connected to the liquid fuel main pipe of each fuel injection device. Preferably, the distance between every two adjacent liquid fuel branch pipes is equal, and the liquid fuel branch pipes are arranged on the sintering charge surface at equal intervals so that the liquid fuel is sprayed on the sintering charge surface more uniformly. Each liquid fuel injection pipe is provided with a fuel nozzle. Each liquid fuel branch pipe is connected with a liquid fuel pool, and each liquid fuel pool is correspondingly provided with a driving device. As shown in fig. 4, since the liquid fuel injected from each liquid fuel pool has a certain initial velocity by the centrifugal force from the fuel injection holes formed in the side wall of the liquid fuel pool, the liquid fuel can be injected to a certain region of the upper part of the frit layer. By combining the technological requirement of fuel, the width of the sintering material surface, the size of a fuel injection hole, the number of liquid fuel pools and the like, the granularity of the injected liquid fuel particles and the rotating speed of the liquid fuel pools can be optimally adjusted, and the injection range of each liquid fuel pool on the sintering material surface is further adjusted, so that the liquid fuel can be uniformly injected to the sintering material surface according to the technological requirement, and the heat supplementing requirement is met.
The invention introduces a heat medium (namely, external heat) to heat and vaporize the liquid fuel sprayed on the sintering charge surface, and can ensure the timely evaporation of the liquid fuel, so that the device only needs to control the granularity of liquid fuel particles to be in the millimeter level. Can guarantee like this that liquid fuel can evenly spray, can guarantee again that the liquid fuel granule can not in time subside because of the buoyancy of air, the liquid fuel granule that erupts simultaneously has certain initial velocity, and the interference killing feature is strong, and the security is high, is favorable to improving solid fuel combustion environment, improves the output quality index of sintering deposit.
In the present application, the width of the pallet of the sintering machine is generally 0.5 to 15m, preferably 1 to 13m, preferably 2 to 12m, more preferably 3 to 10m, preferably 4 to 9m, and further preferably 5 to 8m.
In the present application, the length of the sintering machine is generally 2 to 300m, preferably 3 to 200m, preferably 5 to 180m, more preferably 8 to 150m, preferably 10 to 120m, and further preferably 15 to 100m.
Compared with the prior art, the invention has the following beneficial technical effects:
1. the invention adopts hot air from processes such as a circular cooler and the like to heat and vaporize the liquid fuel sprayed on the surface of the sintering material, can ensure that the liquid fuel is evaporated in time and enters the material layer to be combusted, and can not remain due to untimely evaporation, thereby ensuring that the liquid fuel can supplement the heat in the material layer in time.
2. In actual production, the invention can reasonably configure the number, the length and the like of the fuel injection sections according to the type of the on-site liquid fuel and the distribution of the hot air temperature sections, thereby realizing the technical effect of composite heat compensation of various liquid fuels, and simultaneously, the invention can also utilize hot air with different temperatures in a gradient way, particularly hot air with lower temperature and difficult sensible heat recovery, thereby realizing the effects of waste heat utilization and emission reduction and quality improvement.
3. The invention introduces hot air from the processes of a circular cooler and the like into sintering, not only can play a role in heating vaporized liquid fuel, but also can improve the upper sintering temperature, increase the sintering liquid phase, facilitate full crystallization of minerals and reduce the content of glass phase, thereby improving the yield of the whole sintered body and the strength of sintered ore. The hot air replaces cold air, so that the temperature difference between the pumped air and the hot sintering layer is reduced, the cooling speed is reduced, the thermal stress is reduced, and the strength of the sintered ore is improved. The hot air sintering is coupled with the liquid fuel heat supplement, the liquid fuel is evaporated by utilizing the sensible heat of the hot air, and multiple effects of utilizing waste heat, improving the quality of sintered ore, reducing the consumption of solid fuel and the like are realized.
4. The granularity of the liquid fuel particles sprayed by the invention is only controlled at millimeter level, so that the liquid fuel can be uniformly sprayed, the liquid fuel particles can not settle in time due to the buoyancy of air, and the sprayed liquid fuel particles have certain initial speed, strong anti-interference capability and high safety; therefore, fire extinguishing gas does not need to be blown on the surface of the sintering burden to ensure the production safety, thereby avoiding the problems that the fire extinguishing gas caused by blowing the fire extinguishing gas deteriorates the combustion environment of solid fuel and reduces the quality index of sintered minerals in the prior art.
5. The device divides the liquid fuel injection section into a plurality of fuel injection sections, and the hot air cover, the liquid fuel injection device and the heat medium pipeline are correspondingly arranged on each fuel injection section, so that the heat compensation of various liquid fuels and the auxiliary sintering of multi-section hot air evaporation are realized.
Drawings
FIG. 1 is a flow chart of a multi-stage liquid fuel concurrent heating coupled hot air sintering method according to the present invention;
FIG. 2 is a schematic structural diagram of a multi-stage liquid fuel concurrent heating coupled hot air sintering apparatus according to the present invention;
FIG. 3 is a diagram showing the distribution of the material layer state in the sintering pallet during the liquid fuel injection assisted sintering process of the present invention;
FIG. 4 is a schematic structural view of a multi-stage liquid fuel concurrent heating coupled hot air sintering apparatus of the present invention, which is provided with a liquid fuel pool;
FIG. 5 is a schematic structural diagram of the positions of fuel nozzles of the multi-stage liquid fuel concurrent heating coupled hot air sintering apparatus according to the present invention;
FIG. 6 is a bottom view of the fuel nozzle location of the present invention;
FIG. 7 is a top view of the fuel nozzle location of the present invention;
FIG. 8 is a schematic view of the structure of the device of the present invention in which a detection device is provided in a single fuel injection section.
Reference numerals are as follows:
1: a sintering pallet; 2: a hot air hood; 3: a liquid fuel injection device; 301: a liquid fuel manifold; 302: a liquid fuel branch pipe; 30201: a fuel nozzle; 30202: a fuel circulation hole; 303: a liquid fuel pool; 30301: a fuel injection hole; 304: a drive device; 305: a partition plate; 401: a first temperature detection device; 402: a second temperature detection device; 403: a third temperature detection device; 5: a flow valve; l: a thermal medium pipe;
a1: sintering the ore belt; a2: a combustion zone; a3: drying the preheating zone; a4: an excessively wet band; a5: an original material tape.
Detailed Description
According to a second embodiment of the invention, a multi-stage liquid fuel concurrent heating coupling hot air sintering device is provided.
A multistage liquid fuel heat supplementing and coupling hot air sintering device or a multistage liquid fuel heat supplementing and coupling hot air sintering device used for the method of the first embodiment comprises a sintering machine trolley 1, wherein a liquid fuel injection section is arranged on the sintering machine trolley 1. The liquid fuel injection section is sequentially divided into a plurality of fuel injection sections along the traveling direction of the sintering machine pallet 1. Each fuel injection section is respectively provided with a hot air cover 2 and a liquid fuel injection device 3. The hot air hood 2 is arranged at the upper part of the sintering machine trolley 1. The liquid fuel injection device 3 includes a liquid fuel header pipe 301 and a liquid fuel branch pipe 302. The liquid fuel manifold 301 is disposed outside the hot air hood 2. One end of the liquid fuel branch pipe 302 is connected with the liquid fuel main pipe 301, the other end of the liquid fuel branch pipe 302 extends into the hot air hood 2, and one end extending into the hot air hood 2 is provided with a fuel nozzle 30201. The hot air cover 2 of each fuel injection section is also provided with a heat medium pipeline L which is communicated with the inner space of the hot air cover 2.
In the present invention, the liquid fuel injection device 3 further includes a liquid fuel pool 303 in each fuel injection stage. The liquid fuel pool 303 is disposed within the hot air hood 2. The end of liquid fuel manifold 302 having fuel jets 30201 is connected to liquid fuel pool 303 and liquid fuel manifold 302 extends into or opens into liquid fuel pool 303. The bottom of the liquid fuel pool 303 is provided with a fuel injection hole 30301.
Preferably, the fuel injection hole 30301 is also provided on the side wall of the liquid fuel pool 303. Preferably, a fuel flow hole 30202 is simultaneously formed in the side wall of the liquid fuel branch pipe 302 extending into the liquid fuel pool 303.
Preferably, in each fuel injection section, the liquid fuel injection device 3 further includes a drive device 304. Drive means 304 is provided on liquid fuel pool 303, and drive means 304 drives liquid fuel pool 303 in a rotational motion around liquid fuel branch pipe 302. Preferably, the connection position of liquid fuel branch 302 to liquid fuel pool 303 is located on the central axis of liquid fuel pool 303.
In the present invention, the liquid fuel injection device 3 further includes a partition plate 305 provided in the liquid fuel pool 303 in each fuel injection stage. A partition 305 is located between the outer wall of the liquid fuel branch pipe 302 and the inner wall of the liquid fuel pool 303, and the partition 305 is connected to the bottom of the liquid fuel pool 303. The partition plates 305 divide the internal space of the liquid fuel tank 303 into a plurality of regions.
Preferably, the height of the partition 305 is less than the height of the liquid fuel pool 303. Preferably, the ratio of the height of the partition 305 to the height of the liquid fuel pool 303 is 0.1 to 0.9:1, preferably 0.2 to 0.8:1, more preferably 0.3 to 0.6:1.
in the present invention, the number of the partition plates 305 in each liquid fuel pool 303 is z, and the z partition plates 305 are uniformly distributed radially along the outer circumferential direction of the liquid fuel pool 303 with the liquid fuel branch pipe 302 as the center. The z-piece partition plate 305 uniformly divides the internal space of the liquid fuel pool 303 into z regions, and a plurality of fuel injection holes 30301 are uniformly distributed on the bottom and the side wall of the liquid fuel pool 303 corresponding to each region.
Preferably, 2. Ltoreq. Z.ltoreq.30, preferably 3. Ltoreq. Z.ltoreq.20, more preferably 4. Ltoreq. Z.ltoreq.15.
In the present invention, 1 to 100 liquid fuel branch pipes 302, preferably 2 to 80 liquid fuel branch pipes 302, and more preferably 3 to 50 liquid fuel branch pipes 302 are connected to the liquid fuel main pipe 301 of each liquid fuel injection device 3. Preferably, the spacing between each adjacent two liquid fuel legs 302 is equal. Each liquid fuel branch 302 has a fuel jet 30201. One end of each liquid fuel branch pipe 302 provided with a fuel nozzle 30201 is connected with a liquid fuel pool 303. Each liquid fuel pool 303 is correspondingly provided with a driving device 304.
In the present invention, the apparatus further comprises a first temperature detection means 401. The hot air hood 2 of each fuel injection section is provided with a first temperature detection device 401. The first temperature detection device 401 extends into the hot air hood 2. Preferably, the first temperature detecting means 401 is disposed at the lower portion of the hot air hood 2, i.e., at a position on the hot air hood 2 close to the sintering level.
Preferably, a plurality of first temperature detection devices 401 are uniformly disposed at the lower portion of each hot air hood 2. Preferably, the first temperature detection device 401 is a thermocouple.
Preferably, each of the heat medium pipes L is provided with a second temperature detection device 402. Preferably, each heat medium pipeline L is further provided with a flow valve 5.
Preferably, the liquid fuel manifold 301 of each liquid fuel injection device 3 is provided with a third temperature detection device 403.
Example 1
As shown in FIG. 2, the device comprises a sintering pallet 1, and a liquid fuel injection section is arranged on the sintering pallet 1. The liquid fuel injection section is sequentially divided into 4 fuel injection sections along the traveling direction of the sintering machine pallet 1. Each fuel injection section is respectively provided with a hot air cover 2 and a liquid fuel injection device 3. The hot air hood 2 is arranged at the upper part of the sintering machine trolley 1. The liquid fuel injection device 3 includes a liquid fuel header pipe 301 and a liquid fuel branch pipe 302. The liquid fuel manifold 301 is disposed outside the hot air hood 2. One end of the liquid fuel branch pipe 302 is connected with the liquid fuel main pipe 301, the other end of the liquid fuel branch pipe 302 extends into the hot air hood 2, and one end extending into the hot air hood 2 is provided with a fuel nozzle 30201. The hot air cover 2 of each fuel injection section is also provided with a heat medium pipeline L, and the heat medium pipeline L is communicated with the inner space of the hot air cover 2.
As shown in fig. 3, the sinter bed on the sintering pallet 1 mainly includes, from top to bottom, a sinter bed A1, a combustion zone A2, a dry preheating zone A3, an over-wet zone A4, and an original material zone A5 in this order along the thickness direction of the sinter bed.
Example 2
As shown in fig. 4 to 5, embodiment 1 is repeated except that the liquid fuel injection device 3 further includes a liquid fuel pool 303 in each fuel injection section. The liquid fuel pool 303 is disposed within the hot air hood 2. The end of liquid fuel manifold 302 having fuel jets 30201 is connected to liquid fuel pool 303 and liquid fuel manifold 302 extends into or opens into liquid fuel pool 303. The bottom of the liquid fuel pool 303 is provided with a fuel injection hole 30301.
Example 3
Example 2 was repeated except that the fuel injection hole 30301 was also provided in the side wall of the liquid fuel pool 303. The side wall of the liquid fuel branch pipe 302 extending into the liquid fuel pool 303 is synchronously provided with a fuel flow through hole 30202.
Example 4
Example 5
Embodiment 4 is repeated, except that the liquid fuel injection device 3 further includes a partition plate 305 disposed in the liquid fuel pool 303 in each fuel injection stage, as shown in fig. 6 to 7. A partition 305 is located between the outer wall of the liquid fuel branch pipe 302 and the inner wall of the liquid fuel pool 303, and the partition 305 is connected to the bottom of the liquid fuel pool 303. The partition plates 305 divide the internal space of the liquid fuel pool 303 into a plurality of regions.
Example 6
Example 5 is repeated except that the height of the partition plate 305 is smaller than the height of the liquid fuel pool 303. The height of the partition 305 is 1/3 of the height of the liquid fuel pool 303.
Example 7
Example 5 is repeated except that the height of the partition plate 305 is smaller than the height of the liquid fuel pool 303. The height of the partition 305 is 1/2 of the height of the liquid fuel pool 303.
Example 8
Example 6 was repeated except that the number of the partition plates 305 was 15 in each liquid fuel pool 303, and 15 partition plates 305 were uniformly distributed radially along the outer peripheral direction of the liquid fuel pool 303 with the liquid fuel branch pipe 302 as the center. The 15 partition plates 305 uniformly divide the internal space of the liquid fuel pool 303 into 15 regions, and a plurality of fuel injection holes 30301 are uniformly distributed on the bottom and the side wall of the liquid fuel pool 303 corresponding to each region. The plurality of fuel injection holes 30301 are arranged in a straight line at equal intervals on the bottom and the side wall in each region of the liquid fuel pool 303.
Example 9
Example 6 was repeated except that the number of the partition plates 305 was 12. The 12 partition plates 305 uniformly divide the inner space of the liquid fuel pool 303 into 12 regions.
Example 10
Example 6 was repeated except that the number of the partition plates 305 was 8. The 8 partition plates 305 uniformly divide the internal space of the liquid fuel pool 303 into 8 regions.
Example 11
Example 8 was repeated except that 30 liquid fuel branch pipes 302 were connected to the liquid fuel manifolds 301 of the respective liquid fuel injection devices 3. In the same liquid fuel injection device 3, the distance between each two adjacent liquid fuel branch pipes 302 is equal. Each liquid fuel branch 302 has a fuel jet 30201. One end of each liquid fuel branch pipe 302 provided with a fuel nozzle 30201 is connected with a liquid fuel pool 303. Each liquid fuel pool 303 is correspondingly provided with a driving device 304.
Example 12
As shown in fig. 8, example 11 is repeated except that the apparatus further includes a first temperature detecting means 401. The hot air hood 2 of each fuel injection segment is provided with a first temperature detection device 401. The first temperature detection device 401 extends into the hot air hood 2. The first temperature detecting device 401 is disposed at the lower portion of the hot air hood 2, i.e. at a position on the hot air hood 2 close to the sintering charge level. A plurality of first temperature detecting devices 401 are uniformly arranged at the lower part of each hot air hood 2. The first temperature detecting device 401 is a thermocouple.
Example 13
Example 12 was repeated except that each of the heat medium pipes L was provided with the second temperature detecting means 402. Each heat medium pipeline L is also provided with a flow valve 5.
Example 14
Example 13 is repeated except that the liquid fuel manifolds 301 of the respective liquid fuel injection devices 3 are each provided with a third temperature detection device 403.
Example 15
As shown in fig. 1, a multi-stage liquid fuel concurrent heating coupled hot air sintering method, using the apparatus of example 14, comprises the following steps:
1) The sintering machine is provided with a liquid fuel injection section, the liquid fuel injection section is sequentially divided into 4 fuel injection sections along the running direction of the sintering machine trolley 1, and each fuel injection section respectively injects liquid fuel to the sintering mixture charge level at the corresponding position in the sintering machine trolley 1.
2) And respectively introducing a heat medium into each fuel injection section, and heating and vaporizing the liquid fuel injected on the sintering material surface by the heat medium to form liquid fuel vapor.
3) The mixed gas of the liquid fuel steam and the heat medium in each fuel injection section enters the sintering material layer to be combusted and supply heat to assist sintering.
Example 16
Example 15 was repeated except that along the running direction of the sintering machine pallet 1, the liquid fuel injection section was sequentially divided into the 1 st fuel injection section, the 2 nd fuel injection section, the 3 rd fuel injection section, and the 4 th fuel injection section, and the boiling points of the liquid fuels injected correspondingly in each fuel injection section were sequentially T b1 ，T b2 ，T b3 ，T b4 And T is b1 ＞T b2 ＞T b3 ＞T b4 . Wherein, the liquid fuel injected in the 1 st fuel injection section is biodiesel refined by recovering kitchen waste grease. The liquid fuel injected in the 2 nd fuel injection section is aviation kerosene. The liquid fuel injected in the 3 rd fuel injection section is gasoline. First, theThe liquid fuel injected in the 4 fuel injection sections is alcohol.
Example 17
Example 16 was repeated except that the temperatures of the heat medium introduced into the respective fuel injection stages in the traveling direction of the sintering pallet 1 were sequentially T h1 ，T h2 ，T h3 ，T h4 ，T h1 ＞T h2 ＞T h3 ＞T h4 . Wherein the heat medium introduced into the 1 st fuel injection section is hot air at 350 ℃. The heat medium introduced into the 2 nd fuel injection section is hot air with the temperature of 280 ℃. The heat medium introduced into the 3 rd fuel injection section is hot air at the temperature of 200 ℃. The heat medium introduced into the 4 th fuel injection section is hot air at 150 ℃.
Example 18
Example 17 was repeated except that in step 3), the temperature target value of the mixed gas of the liquid fuel vapor and the heat medium in the i-th fuel injection stage was T Let i 。T Let i ＝150℃。
Example 19
The embodiment 18 is repeated, except that the amount of heat absorbed by the liquid fuel injected to the sintering charge surface by the ith fuel injection section is equal to the amount of heat released by the corresponding introduced heat medium, and the required introduced heat medium amount in the ith fuel injection section is calculated and adjusted, and the method specifically comprises the following substeps:
during the vaporization of the liquid fuel by heating, the quantity of heat absorbed by the liquid fuel is calculated: detecting the initial temperature of the liquid fuel as T Liquid for treating urinary tract infection The total amount of liquid fuel injected to the sinter mix charge level at the position corresponding to the ith fuel injection section is M Solution i The temperature of the mixed gas of the liquid fuel vapor and the heat medium in the ith fuel injection section is T Let i Whereby the heat Q absorbed by vaporization of the liquid fuel injected in the i-th fuel injection stage Liquid i Comprises the following steps:
Q solution i ＝C Liquid for treating urinary tract infection M Solution i (T Steaming food -T Liquid for treating urinary tract infection )+M Solution i r Liquid for medical purpose +C Steam generator M Steam i (T Let i -T Steaming machine )…………(1)。
In the formula: c Liquid for treating urinary tract infection Is the specific heat capacity of the liquid fuel. T is Steaming machine Is the boiling point of the liquid fuel. r is Liquid for treating urinary tract infection Is the heat of vaporization of the liquid fuel. C Steam generator Is the specific heat capacity of the liquid fuel vapor. M is a group of Steam i Total amount of liquid fuel vapor in ith fuel injection stage, M Steam i ＝M Liquid i 。
During the vaporization of the liquid fuel by heating, the heat released by the heat medium is calculated: detecting the initial temperature T of the introduced heat medium Heat generation The temperature of the mixed gas of the liquid fuel vapor and the heat medium in the ith fuel injection section is T Let i The heat Q released by the heat medium introduced into the ith fuel injection section in the process of heating the vaporized liquid fuel Heat i Comprises the following steps:
Q heat i ＝C Heat generation M Heat i (T Heat generation -T Let i )＝C Heat generation V Heat i ρ Heat generation (T Heat generation -T Let i )…………(2)。
In the formula: c Heat generation Is the specific heat capacity of the thermal medium. M Heat i The mass of the heating medium required for the ith fuel injection stage. V Heat i The volume of heat medium required for the ith fuel injection stage. Rho Heat generation Is the density of the thermal medium.
According to the principle of heat balance, in the process of heating and vaporizing the liquid fuel, the heat absorbed by the liquid fuel is equal to the heat released by the heat medium, namely:
Q solution i ＝Q Heat i …………(3)。
The amount V of the heat medium required to be introduced into the ith fuel injection section Heat i Comprises the following steps:
each fuel injection section is provided with a hot air cover 2, each hot air cover 2 is provided with a heat medium pipeline L, and heat medium is introduced into the corresponding hot air cover 2 through each heat medium pipeline L; adjusting the opening of the flow valve 5 on the heating medium line L of the ith fuel injection stageThe amount of the heat medium introduced into the hot air hood 2 is V Heat i 。
Example 20
Example 19 was repeated except that the first temperature detecting means 401 was provided in each of the hot air hoods 2 of the respective fuel injection stages. The first temperature detection device 401 located in the ith fuel injection section detects the temperature T of the mixed gas of the liquid fuel steam and the heat medium in the hot air hood 2 of the ith fuel injection section in real time i . Comparing the actual temperature T detected in the i-th fuel injection section i And a target temperature value T Let i . If T is i ＝T Let i The device continues to operate. If T is i ≠T Let i Adjusting the temperature of the heat medium introduced into the hot air hood 2 at the ith fuel injection section to ensure that T is equal to i ＝T Let i 。
Wherein if T i >T Let i Then the temperature of the heat medium introduced into the hot air hood 2 from the ith fuel injection section is reduced so that T i ＝ T Let i . If T i <T Let i Increasing the temperature of the heat medium introduced into the hot air hood 2 in the ith fuel injection section to enable T i ＝T Let i 。
Example 21
Example 19 was repeated except that the first temperature detecting means 401 was provided in each of the hot air hoods 2 of the respective fuel injection stages. The first temperature detection device 401 located in the ith fuel injection section detects the temperature T of the mixed gas of the liquid fuel steam and the heat medium in the hot air hood 2 of the ith fuel injection section in real time i . Comparing the actual temperature T detected in the i-th fuel injection section i And a target temperature value T Let i . If T i ＝T Let i The device continues to operate. If T is i ≠T Let i Adjusting the quantity of the heat medium introduced into the hot air hood 2 in the ith fuel injection section to ensure that T i ＝T Let i 。
Wherein if T i >T Let i Then the opening degree of the flow valve 5 on the heat medium pipeline L of the ith fuel injection section is reduced so as to reduce the amount of the heat medium introduced into the hot air hood 2, and the T is enabled i ＝T Let i . If T is i <T Let i Then, the opening degree of the flow valve 5 on the heat medium pipeline L of the ith fuel injection section is increased, so that the quantity of the heat medium introduced into the hot air hood 2 is increased, and T is enabled i ＝T Let i 。
Example 22
Example 19 was repeated except that the first temperature detecting means 401 was provided in each of the hot air hoods 2 of the respective fuel injection stages. The first temperature detection device 401 located in the ith fuel injection section detects the temperature T of the mixed gas of the liquid fuel steam and the heat medium in the hot air hood 2 of the ith fuel injection section in real time i . Comparing the actual temperature T detected in the i-th fuel injection section i And a target temperature value T Let i . If T i ＝T Let i The device continues to operate. If T is i ≠T Let i Then, the temperature of the heat medium and the amount of the heat medium introduced into the hot air hood 2 in the ith fuel injection section are adjusted simultaneously so that T i ＝T Let i 。
Application example 1
A method for sintering multi-stage liquid fuel by using the device of embodiment 14 through heat supplementing and coupling with hot air, comprising the following steps:
1) The sintering machine is provided with a liquid fuel injection section, the liquid fuel injection section is sequentially divided into 4 fuel injection sections along the running direction of the sintering machine trolley 1, and each fuel injection section respectively injects liquid fuel to the sintering mixture charge level at the corresponding position in the sintering machine trolley 1.
2) And respectively introducing a heat medium into each fuel injection section, and heating and vaporizing the liquid fuel injected on the sintering material surface by the heat medium to form liquid fuel vapor.
3) The mixed gas of liquid fuel steam and heat medium in each fuel injection section enters the sintering material layer to be combusted and heat supplied to assist sintering.
Along the running direction of the sintering machine trolley 1, the liquid fuel injection section is divided into a1 st fuel injection section, a2 nd fuel injection section, a3 rd fuel injection section and a4 th fuel injection section in sequence, and the boiling points of the liquid fuels correspondingly injected in the fuel injection sections are T in sequence b1 ，T b2 ，T b3 ，T b4 And T is b1 ＞T b2 ＞T b3 ＞T b4 . Wherein, the liquid fuel injected in the 1 st fuel injection section is biodiesel refined by recovering kitchen waste grease. The liquid fuel injected in the 2 nd fuel injection section is aviation kerosene. The liquid fuel injected in the 3 rd fuel injection section is gasoline. The liquid fuel injected in the 4 th fuel injection stage is alcohol.
Correspondingly, along the running direction of the sintering machine trolley 1, the temperature of the heat medium correspondingly introduced into each fuel injection section is sequentially T h1 ，T h2 ，T h3 ，T h4 ，T h1 ＞T h2 ＞T h3 ＞T h4 . Wherein the heat medium introduced into the 1 st fuel injection section is hot air at 350 ℃. The heat medium introduced into the 2 nd fuel injection section is hot air with the temperature of 300 ℃. The heat medium introduced into the 3 rd fuel injection section is 240 ℃ hot air. The heat medium introduced into the 4 th fuel injection section is hot air at the temperature of 200 ℃.
Calculating and adjusting the amount of the heat medium required to be introduced into the 4 th fuel injection section according to the fact that the heat absorbed by the liquid fuel injected to the sintering charge surface by the 4 th fuel injection section is equal to the heat released by the heat medium correspondingly introduced into the 4 th fuel injection section, and specifically comprising the following substeps:
during the vaporization of the liquid fuel by heating, the heat absorbed by the liquid fuel is calculated: detecting the initial temperature T of the liquid fuel Liquid for treating urinary tract infection =30 ℃, and the total amount of liquid fuel M injected to the sinter mix charge level at the position corresponding to the 4 th fuel injection segment Liquid 4 =113kg/h, temperature T of mixed gas of liquid fuel vapor and heat medium in 4 th fuel injection stage Let 4 =120 ℃, whereby the heat Q absorbed by vaporization of the liquid fuel injected in the 4 th fuel injection stage Liquid 4 Comprises the following steps:
Q liquid 4 ＝C Liquid for treating urinary tract infection M Liquid 4 (T Steaming machine -T Liquid for treating urinary tract infection )+M Liquid 4 r Liquid for medical purpose +C Steam generator M Steam 4 (T Let 4 -T Steaming machine )＝118423.12kJ/h。
In the formula: c Liquid for medical purpose Is specific heat of liquid fuelC of container Liquid for treating urinary tract infection ＝2.47kJ/(℃·kg)。T Steaming machine Is the boiling point of the liquid fuel, T Steaming machine ＝78.09℃。 r Liquid for treating urinary tract infection Heat of vaporization of liquid fuel, r Liquid for treating urinary tract infection ＝850kJ/kg。C Steam generator Is the specific heat capacity of the liquid fuel vapour, C Steam generator ＝1.89kJ/(℃·kg)， M Steam 4 The amount of steam after evaporation of the liquid fuel, M Steam 4 ＝M Liquid 4 ＝113kg/h。
During the vaporization of the liquid fuel by heating, the heat released by the thermal medium is calculated: detecting the initial temperature T of the introduced heat medium Heat generation =200 ℃, temperature T of mixed gas of liquid fuel vapor and heat medium in 4 th fuel injection segment Let 4 =120 ℃, whereby the heat quantity Q released by the heat medium introduced into the 4 th fuel injection stage during the heating of the vaporized liquid fuel Heat 4 Comprises the following steps:
Q heat 4 ＝C Heat generation M Heat 4 (T Heat generation -T Let 4 )＝C Heat generation V Heat 4 ρ Heat generation (T Heat generation -T Let 4 )。
In the formula: c Heat generation Is the specific heat capacity of the heat medium, C Heat generation ＝1.02kJ/(kg·℃)。M Heat 4 The mass of the heating medium required for the 4 th fuel injection stage, kg. V Heat 4 Volume of heating medium required for the 4 th fuel injection stage, m 3 。ρ Heat generation Is the density of the thermal medium, p Heat generation ＝0.7359kg/m 3 。
According to the principle of heat balance, in the process of heating and vaporizing the liquid fuel, the heat absorbed by the liquid fuel is equal to the heat released by the heat medium, that is, the following steps are provided:
Q liquid 4 ＝Q Heat 4 。
The quantity V of the heat medium required to be introduced into the 4 th fuel injection stage Heat 4 Comprises the following steps:
each fuel injection section is provided with a hot air cover 2, and each hot air coverThe hot air hoods 2 are respectively provided with a hot medium pipeline L, and a hot medium is respectively introduced into the corresponding hot air hoods 2 through each hot medium pipeline L. The opening degree of a flow valve 5 on a heat medium pipeline L of the 4 th fuel injection section is adjusted to ensure that the quantity of the heat medium introduced into the hot air cover 2 is V Heat 4 。
The hot air hoods 2 of the respective fuel injection stages are respectively provided with first temperature detection devices 401. The first temperature detection device 401 located in the 4 th fuel injection segment detects the temperature T of the mixed gas of the liquid fuel vapor and the heat medium in the hot air hood 2 of the 4 th fuel injection segment in real time 4 =120 ℃. Comparing the actual temperature T detected in the 4 th fuel injection section 4 And a target temperature value T Let 4 . Due to T 4 ＝T Let 4 That is, the actual temperature of the mixed gas of the liquid fuel vapor and the heat medium in the hot air hood 2 of the 4 th fuel injection segment is within the range of the target temperature value, which indicates that the temperature in the hot air hood 2 is controlled within the normal range at this time, and the device keeps the current sintering parameters to continue to operate.
Application example 2
A multi-stage liquid fuel concurrent heating coupled hot air sintering method, using the apparatus of embodiment 14, the method comprising the steps of:
1) The sintering machine is provided with a liquid fuel injection section, the liquid fuel injection section is sequentially divided into 4 fuel injection sections along the running direction of the sintering machine trolley 1, and each fuel injection section respectively injects liquid fuel to the sintering mixture charge level at the corresponding position in the sintering machine trolley 1.
2) And respectively introducing a heat medium into each fuel injection section, wherein the heat medium heats and vaporizes the liquid fuel injected on the sintering charge surface to form liquid fuel vapor.
3) The mixed gas of the liquid fuel steam and the heat medium in each fuel injection section enters the sintering material layer to be combusted and supply heat to assist sintering.
Along the running direction of the sintering machine trolley 1, the liquid fuel injection section is divided into a1 st fuel injection section, a2 nd fuel injection section, a3 rd fuel injection section and a4 th fuel injection section in sequence, and the boiling points of the liquid fuels injected correspondingly in the fuel injection sections are T in sequence b1 ，T b2 ，T b3 ，T b4 And T is b1 ＞T b2 ＞T b3 ＞T b4 . Wherein, the liquid fuel injected in the 1 st fuel injection section is biodiesel refined by recovering kitchen waste grease. The liquid fuel injected in the 2 nd fuel injection section is aviation kerosene. The liquid fuel injected in the 3 rd fuel injection section is gasoline. The liquid fuel injected in the 4 th fuel injection stage is alcohol.
Correspondingly, along the running direction of the sintering machine trolley 1, the temperature of the heat medium correspondingly introduced into each fuel injection section is sequentially T h1 ，T h2 ，T h3 ，T h4 ，T h1 ＞T h2 ＞T h3 ＞T h4 . Wherein the heat medium introduced into the 1 st fuel injection section is hot air at 350 ℃. The heat medium introduced into the 2 nd fuel injection section is hot air at the temperature of 280 ℃. The heat medium introduced into the 3 rd fuel injection section is hot air at 220 ℃. The heat medium introduced into the 4 th fuel injection section is hot air at the temperature of 180 ℃.
According to the fact that the heat absorbed by the liquid fuel sprayed on the sintering charge level by the 4 th fuel injection section is equal to the heat released by the correspondingly introduced heat medium, the amount of the heat medium required to be introduced into the 4 th fuel injection section is calculated and adjusted, and the method specifically comprises the following substeps:
during the vaporization of the liquid fuel by heating, the quantity of heat absorbed by the liquid fuel is calculated: detecting the initial temperature T of the liquid fuel Liquid for treating urinary tract infection =30 ℃, and the total amount of liquid fuel M injected to the sinter mix charge level at the position corresponding to the 4 th fuel injection segment Liquid 4 =124kg/h, temperature T of mixed gas of liquid fuel vapor and heat medium in 4 th fuel injection section Let 4 =120 ℃, whereby the heat Q absorbed by vaporization of the liquid fuel injected in the 4 th fuel injection stage Liquid 4 Comprises the following steps:
Q liquid 4 ＝C Liquid for treating urinary tract infection M Liquid 4 (T Steaming food -T Liquid for treating urinary tract infection )+M Liquid 4 r Liquid for treating urinary tract infection +C Steam generator M Steam 4 (T Let 4 -T Steaming food )＝129951.03kJ/h。
In the formula: c Liquid for medical purpose Specific heat capacity of liquid fuel, C Liquid for medical purpose ＝2.47kJ/(℃·kg)。T Steaming food Is the boiling point of the liquid fuel, T Steaming food ＝78.09℃。 r Liquid for treating urinary tract infection Heat of vaporization of liquid fuel, r Liquid for treating urinary tract infection ＝850kJ/kg。C Steam generator Specific heat capacity of liquid fuel vapor, C Steam generator ＝1.89kJ/(℃·kg)， M Steam 4 The amount of vapor after evaporation of the liquid fuel, M Steam 4 ＝M Liquid 4 ＝124kg/h。
During the vaporization of the liquid fuel by heating, the heat released by the heat medium is calculated: detecting the initial temperature T of the introduced heat medium Heat generation =180 ℃, temperature T of mixed gas of liquid fuel vapor and heat medium in 4 th fuel injection segment Let 4 =120 ℃, whereby the heat quantity Q released by the heat medium introduced into the 4 th fuel injection stage during the heating of the vaporized liquid fuel Heat 4 Comprises the following steps:
Q heat 4 ＝C Heat generation M Heat 4 (T Heat generation -T Let 4 )＝C Heat generation V Heat 4 ρ Heat generation (T Heat generation -T Let 4 )。
In the formula: c Heat generation Is the specific heat capacity of the heat medium, C Heat generation ＝1.02kJ/(kg·℃)。M Heat 4 The mass of the heating medium required for the 4 th fuel injection stage, kg. V Heat 4 Volume of heating medium required for the 4 th fuel injection stage, m 3 。ρ Heat generation Density of the heat medium, p Heat generation ＝0.7359kg/m 3 。
According to the principle of heat balance, in the process of heating and vaporizing the liquid fuel, the heat absorbed by the liquid fuel is equal to the heat released by the heat medium, namely:
Q liquid 4 ＝Q Heat 4 。
The quantity V of heat medium required to be introduced into the 4 th fuel injection stage is thus determined Heat 4 Comprises the following steps:
on each fuel injection sectionThe hot air hood is provided with hot air hoods 2, each hot air hood 2 is provided with a heat medium pipeline L, and heat media are respectively introduced into the corresponding hot air hood 2 through each heat medium pipeline L. The opening degree of a flow valve 5 on a heat medium pipeline L of the 4 th fuel injection section is adjusted to ensure that the quantity of the heat medium introduced into the hot air cover 2 is V Heat 4 。
The hot air hoods 2 of the respective fuel injection stages are respectively provided with first temperature detection devices 401. The first temperature detection device 401 located in the 4 th fuel injection segment detects the temperature T of the mixed gas of the liquid fuel vapor and the heat medium in the hot air hood 2 of the 4 th fuel injection segment in real time 4 =105 ℃. Comparing the actual temperature T detected in the 4 th fuel injection section 4 And a target temperature value T Let 4 . Due to T 4 ＜T Let 4 Explaining that the problems of fuel waste and insufficient sintering heat compensation caused by untimely evaporation and vaporization of liquid fuel due to lower temperature in the current hot air cover 2 are easily caused, the temperature of the heat medium introduced into the hot air cover 2 by the 4 th fuel injection section needs to be increased at the moment, so that T is ensured 4 ＝T Let 4 And further controls the temperature in the hot air hood 2 to return to the normal range.
Application example 3
A multi-stage liquid fuel concurrent heating coupled hot air sintering method, using the apparatus of embodiment 14, the method comprising the steps of:
1) The sintering machine is provided with a liquid fuel injection section, the liquid fuel injection section is sequentially divided into 4 fuel injection sections along the running direction of the sintering machine trolley 1, and each fuel injection section respectively injects liquid fuel to the sintering mixture material surface at the corresponding position in the sintering machine trolley 1.
2) And respectively introducing a heat medium into each fuel injection section, wherein the heat medium heats and vaporizes the liquid fuel injected on the sintering charge surface to form liquid fuel vapor.
3) The mixed gas of liquid fuel steam and heat medium in each fuel injection section enters the sintering material layer to be combusted and heat supplied to assist sintering.
Along the running direction of the sintering machine trolley 1, the liquid fuel injection section is divided into the 1 st fuel injection section, the 2 nd fuel injection section and the 3 rd fuel injection section in sequenceThe boiling points of the liquid fuels correspondingly injected in each fuel injection section are T in sequence b1 ，T b2 ，T b3 ，T b4 And T is b1 ＞T b2 ＞T b3 ＞T b4 . Wherein, the liquid fuel injected in the 1 st fuel injection section is biodiesel refined from kitchen waste grease. The liquid fuel injected in the 2 nd fuel injection section is aviation kerosene. The liquid fuel injected in the 3 rd fuel injection section is gasoline. The liquid fuel injected in the 4 th fuel injection stage is alcohol.
Correspondingly, along the running direction of the sintering machine trolley 1, the temperature of the heat medium correspondingly introduced into each fuel injection section is sequentially T h1 ，T h2 ，T h3 ，T h4 ，T h1 ＞T h2 ＞T h3 ＞T h4 . Wherein the heat medium introduced into the 1 st fuel injection section is hot air at 350 ℃. The heat medium introduced into the 2 nd fuel injection section is hot air at 300 ℃. The heat medium introduced into the 3 rd fuel injection section is hot air at 240 ℃. The heat medium introduced into the 4 th fuel injection section is hot air at the temperature of 210 ℃.
According to the fact that the heat absorbed by the liquid fuel sprayed on the sintering charge level by the 4 th fuel injection section is equal to the heat released by the correspondingly introduced heat medium, the amount of the heat medium required to be introduced into the 4 th fuel injection section is calculated and adjusted, and the method specifically comprises the following substeps:
during the vaporization of the liquid fuel by heating, the heat absorbed by the liquid fuel is calculated: detecting the initial temperature T of the liquid fuel Liquid for medical purpose =30 ℃, and the total amount M of liquid fuel injected to the sintering mixture charge level at the corresponding position of the 4 th fuel injection section Liquid 4 =102kg/h, temperature T of mixed gas of liquid fuel vapor and heat medium in 4 th fuel injection section Let 4 =120 ℃, whereby the heat Q absorbed by vaporization of the liquid fuel injected in the 4 th fuel injection stage Liquid 4 Comprises the following steps:
Q liquid 4 ＝C Liquid for medical purpose M Liquid 4 (T Steaming food -T Liquid for treating urinary tract infection )+M Liquid 4 r Liquid for treating urinary tract infection +C Steam generator M Steam 4 (T Let 4 -T Steaming food )＝106895.20kJ/h。
In the formula: c Liquid for treating urinary tract infection Is the specific heat capacity of the liquid fuel, C Liquid for treating urinary tract infection ＝2.47kJ/(℃·kg)。T Steaming food Is the boiling point of the liquid fuel, T Steaming machine ＝78.09℃。 r Liquid for treating urinary tract infection Heat of vaporization of liquid fuel, r Liquid for treating urinary tract infection ＝850kJ/kg。C Steam generator Specific heat capacity of liquid fuel vapor, C Steam generator ＝1.89kJ/(℃·kg)， M Steam 4 The amount of vapor after evaporation of the liquid fuel, M Steam 4 ＝M Liquid 4 ＝102kg/h。
During the vaporization of the liquid fuel by heating, the heat released by the heat medium is calculated: detecting the initial temperature T of the introduced heat medium Heat generation =210 ℃, temperature T of the mixed gas of liquid fuel vapor and heat medium in the 4 th fuel injection stage Let 4 =120 ℃, whereby the heat quantity Q released by the heat medium introduced into the 4 th fuel injection stage during the heating of the vaporized liquid fuel Heat 4 Comprises the following steps:
Q heat 4 ＝C Heat generation M Heat 4 (T Heat generation -T Let 4 )＝C Heat generation V Heat 4 ρ Heat generation (T Heat generation -T Let 4 )。
In the formula: c Heat generation Is the specific heat capacity of the heat medium, C Heat generation ＝1.02kJ/(kg·℃)。M Heat 4 The mass of the heating medium required for the 4 th fuel injection stage, kg. V Heat 4 Volume of heating medium required for the 4 th fuel injection stage, m 3 。ρ Heat generation Density of the heat medium, p Heat generation ＝0.7359kg/m 3 。
According to the principle of heat balance, in the process of heating and vaporizing the liquid fuel, the heat absorbed by the liquid fuel is equal to the heat released by the heat medium, namely:
Q liquid 4 ＝Q Heat 4 。
The quantity V of heat medium required to be introduced into the 4 th fuel injection stage is thus determined Heat 4 Comprises the following steps:
each fuel injection section is provided with a hot air cover 2, each hot air cover 2 is provided with a heat medium pipeline L, and heat medium is introduced into the corresponding hot air cover 2 through each heat medium pipeline L. The opening degree of a flow valve 5 on a heat medium pipeline L of the 4 th fuel injection section is adjusted to ensure that the quantity of the heat medium introduced into the hot air cover 2 is V Heat 4 。
The hot air hoods 2 of the respective fuel injection stages are respectively provided with first temperature detection devices 401. The first temperature detection device 401 located in the 4 th fuel injection segment detects the temperature T of the mixed gas of the liquid fuel vapor and the heat medium in the hot air hood 2 of the 4 th fuel injection segment in real time 4 =143 ℃. Comparing the actual temperature T detected in the 4 th fuel injection section 4 And a target temperature value T Let 4 . Due to T 4 ＞T Let 4 Explaining that the high temperature abnormality occurs in the current hot air cover 2, the liquid fuel steam may catch fire above the charge level, at this time, the temperature of the heat medium introduced into the hot air cover 2 by the 4 th fuel injection section is reduced, and the opening degree of the flow valve 5 on the heat medium pipeline L of the 4 th fuel injection section is reduced, so that the amount of the heat medium introduced into the hot air cover 2 is reduced, and the T is enabled to be T 4 ＝ T Let 4 And further the temperature in the hot air hood 2 is controlled to return to the normal range, and the potential safety hazard is eliminated.
Claims (14)
1. A multi-section liquid fuel concurrent heating coupling hot air sintering method comprises the following steps:
1) The sintering machine is provided with a liquid fuel injection section, the liquid fuel injection section is sequentially divided into a plurality of fuel injection sections along the running direction of the sintering machine trolley (1), and each fuel injection section respectively injects liquid fuel to the sintering mixture charge level at the corresponding position in the sintering machine trolley (1);
2) Respectively introducing a heat medium into each fuel injection section, and heating and vaporizing the liquid fuel injected on the sintering charge surface by the heat medium to form liquid fuel vapor;
3) The mixed gas of the liquid fuel steam and the heat medium in each fuel injection section enters the sintering material layer to be combusted and supply heat to assist sintering.
2. The method of claim 1, wherein: setting the number of stages of the fuel injection stage as N; along the running direction of a sintering machine trolley (1), the liquid fuel injection section is sequentially divided into a1 st fuel injection section, a2 nd fuel injection section, a \8230theboiling point of the liquid fuel correspondingly injected in each fuel injection section is sequentially T b1 ，T b2 ……T bN (ii) a Wherein, T b1 ＞T b2 ＞……＞T bN 。
3. The method of claim 2, wherein: along the running direction of the sintering machine trolley (1), the temperature of the heat medium correspondingly introduced into each fuel injection section is sequentially T h1 ，T h2 ……T hN (ii) a Wherein, T h1 ＞T h2 ＞……＞T hN 。
4. The method according to any one of claims 1-3, wherein: in step 3), the temperature target value of the mixed gas of the liquid fuel vapor and the heat medium in the ith fuel injection stage is T Let i ；T Let i The value range of (A) is 80-500 ℃, preferably 100-400 ℃, and more preferably 120-300 ℃;
preferably, the method for calculating and adjusting the amount of the heat medium required to be introduced into the ith fuel injection section according to the fact that the heat quantity absorbed by the liquid fuel injected to the sintering charge surface by the ith fuel injection section is equal to the heat quantity released by the heat medium correspondingly introduced into the ith fuel injection section specifically comprises the following substeps:
(1) during the vaporization of the liquid fuel by heating, the heat absorbed by the liquid fuel is calculated: detecting the initial temperature of the liquid fuel as T Liquid for treating urinary tract infection The total amount of liquid fuel injected to the sinter mix charge level at the position corresponding to the ith fuel injection section is M Liquid i The temperature of the mixed gas of the liquid fuel vapor and the heat medium in the ith fuel injection section is T Let i Whereby the liquid fuel injected in the i-th fuel injection stage vaporizes the absorbed heatQuantity Q Liquid i Comprises the following steps:
Q liquid i ＝C Liquid for medical purpose M Liquid i (T Steaming food -T Liquid for treating urinary tract infection )+M Liquid i r Liquid for treating urinary tract infection +C Steam generator M Steam i (T Let i -T Steaming food )…………(1)；
In the formula: c Liquid for treating urinary tract infection Is the specific heat capacity of the liquid fuel; t is Steaming machine Is the boiling point of the liquid fuel; r is a radical of hydrogen Liquid for medical purpose Heat of vaporization for liquid fuels; c Steam generator Is the specific heat capacity of the liquid fuel vapor; m Steam i Total amount of liquid fuel vapor in the i-th fuel injection stage, M Steam i ＝M Solution i ；
(2) During the vaporization of the liquid fuel by heating, the heat released by the thermal medium is calculated: detecting the initial temperature T of the introduced heat medium Heat generation The temperature of the mixed gas of the liquid fuel vapor and the heat medium in the ith fuel injection section is T Let i The heat Q released by the heat medium introduced into the ith fuel injection section in the process of heating the vaporized liquid fuel Heat i Comprises the following steps:
Q heat i ＝C Heat generation M Heat i (T Heat generation -T Let i )＝C Heat generation V Heat i ρ Heat generation (T Heat generation -T Let i )…………(2)；
In the formula: c Heat generation Is the specific heat capacity of the thermal medium; m Heat i The mass of the heat medium required to be introduced into the ith fuel injection section; v Heat i The volume of the heat medium required to be introduced into the ith fuel injection section; ρ is a unit of a gradient Heat generation Is the density of the thermal medium;
(3) according to the principle of heat balance, in the process of heating and vaporizing the liquid fuel, the heat absorbed by the liquid fuel is equal to the heat released by the heat medium, that is, the following steps are provided:
Q solution i ＝Q Heat i …………(3)；
The quantity V of the heat medium required to be introduced into the ith fuel injection section Heat i Comprises the following steps:
each fuel injection section is provided with a hot air cover (2), each hot air cover (2) is provided with a heat medium pipeline (L), and heat media are respectively introduced into the corresponding hot air cover (2) through each heat medium pipeline (L); the opening degree of a flow valve (5) on a heat medium pipeline (L) of the ith fuel injection section is adjusted to ensure that the quantity of the heat medium introduced into the hot air cover (2) is V Heat i 。
5. The method of claim 4, wherein: a first temperature detection device (401) is respectively arranged on the hot air cover (2) of each fuel injection section; a first temperature detection device (401) positioned in the ith fuel injection section detects the mixed gas temperature T of the liquid fuel steam and the heat medium in the hot air cover (2) of the ith fuel injection section in real time i (ii) a Comparing the actual temperature T detected in the i-th fuel injection section i And a target temperature value T Let i (ii) a If T i ＝T Let i The device continues to operate; if T i ≠T Let i Adjusting the temperature and/or the amount of the heat medium flowing into the hot air hood (2) from the ith fuel injection section to ensure that T is equal to i ＝T Let i ；
Preferably, if T i ＞T Let i Reducing the temperature of the heat medium introduced into the hot air hood (2) by the ith fuel injection section, or reducing the opening degree of an upper flow valve (5) of a heat medium pipeline (L) of the ith fuel injection section so as to reduce the amount of the heat medium introduced into the hot air hood (2), or simultaneously adjusting the amount and the temperature of the heat medium introduced into the hot air hood (2) by the ith fuel injection section to ensure that T is equal to T i ＝T Let i ；
If T i ＜T Let i Increasing the temperature of the heat medium introduced into the hot air hood (2) by the ith fuel injection section, or increasing the opening degree of a flow valve (5) on a heat medium pipeline (L) of the ith fuel injection section so as to increase the amount of the heat medium introduced into the hot air hood (2), or simultaneously adjusting the amount and the temperature of the heat medium introduced into the hot air hood (2) by the ith fuel injection section so that T is equal to T i ＝T Let i 。
6. The method according to any one of claims 1-5, wherein: the boiling point of the liquid fuel is 15-500 ℃, preferably 25-380 ℃, and more preferably 50-250 ℃; preferably, the liquid fuel injected in each fuel injection section is one or more of biodiesel, aviation kerosene, gasoline, alcohol liquid fuel and alkane liquid fuel; and/or
The initial temperature of the heat medium when the heat medium is introduced into the hot air hood (2) is 100-550 ℃, preferably 120-400 ℃, and more preferably 150-300 ℃; preferably, the heat medium is hot air.
7. A multi-stage liquid fuel concurrent heating coupling hot air sintering device or a multi-stage liquid fuel concurrent heating coupling hot air sintering device used for the method of any one of claims 1 to 6, the device comprises a sintering machine trolley (1), and a liquid fuel injection section is arranged on the sintering machine trolley (1); along the running direction of the sintering machine trolley (1), the liquid fuel injection section is sequentially divided into a plurality of fuel injection sections; each fuel injection section is respectively provided with a hot air cover (2) and a liquid fuel injection device (3); the hot air hood (2) is arranged at the upper part of the sintering machine trolley (1); the liquid fuel injection device (3) comprises a liquid fuel main pipe (301) and a liquid fuel branch pipe (302); the liquid fuel main pipe (301) is arranged at the outer side of the hot air cover (2); one end of the liquid fuel branch pipe (302) is connected with the liquid fuel main pipe (301), the other end of the liquid fuel branch pipe (302) extends into the hot air cover (2), and one end extending into the hot air cover (2) is provided with a fuel nozzle (30201); the hot air cover (2) of each fuel injection section is also provided with a heat medium pipeline (L), and the heat medium pipeline (L) is communicated with the inner space of the hot air cover (2).
8. The apparatus of claim 7, wherein: within each fuel injection section, the liquid fuel injection device (3) further comprises a liquid fuel pool (303); the liquid fuel pool (303) is arranged in the hot air hood (2); one end of the liquid fuel branch pipe (302) provided with a fuel nozzle (30201) is connected with the liquid fuel pool (303), and the liquid fuel branch pipe (302) extends into or leads to the liquid fuel pool (303); the bottom of the liquid fuel pool (303) is provided with a fuel jet hole (30301);
preferably, the side wall of the liquid fuel pool (303) is also provided with a fuel injection hole (30301); preferably, a fuel circulation hole (30202) is simultaneously opened in the side wall of the liquid fuel branch pipe (302) extending into the liquid fuel pool (303).
9. The apparatus of claim 8, wherein: within each fuel injection section, the liquid fuel injection device (3) further comprises a drive device (304); the driving device (304) is arranged on the liquid fuel pool (303), and the driving device (304) drives the liquid fuel pool (303) to rotate around the liquid fuel branch pipe (302); preferably, the connection position of the liquid fuel branch pipe (302) and the liquid fuel pool (303) is positioned on the central axis of the liquid fuel pool (303).
10. The apparatus of claim 8 or 9, wherein: in each fuel injection section, the liquid fuel injection device (3) further comprises a partition plate (305) disposed in the liquid fuel pool (303); the partition plate (305) is positioned between the outer wall of the liquid fuel branch pipe (302) and the inner wall of the liquid fuel pool (303), and the partition plate (305) is connected with the bottom of the liquid fuel pool (303); the partition plate (305) divides an inner space of the liquid fuel pool (303) into a plurality of regions;
preferably, the height of the partition plate (305) is smaller than that of the liquid fuel pool (303); preferably, the ratio of the height of the partition plate (305) to the height of the liquid fuel pool (303) is 0.1-0.9:1, preferably 0.2 to 0.8:1, more preferably 0.3 to 0.6:1.
11. the apparatus of claim 10, wherein: in each liquid fuel pool (303), the number of the partition plates (305) is z, and the z partition plates (305) are uniformly distributed in a radial shape along the peripheral direction of the liquid fuel pool (303) by taking the liquid fuel branch pipe (302) as the center; the internal space of the liquid fuel pool (303) is uniformly divided into z areas by z partition plates (305), and a plurality of fuel injection holes (30301) which are uniformly distributed are arranged at the bottom and on the side wall of the liquid fuel pool (303) corresponding to each area;
preferably, 2. Ltoreq. Z.ltoreq.30, preferably 3. Ltoreq. Z.ltoreq.20, more preferably 4. Ltoreq. Z.ltoreq.15.
12. The apparatus according to any one of claims 9-11, wherein: 1-100 liquid fuel branch pipes (302), preferably 2-80 liquid fuel branch pipes (302), more preferably 3-50 liquid fuel branch pipes (302) are respectively connected to a liquid fuel main pipe (301) of each liquid fuel injection device (3); preferably, the distance between every two adjacent liquid fuel branch pipes (302) is equal; each liquid fuel branch pipe (302) is provided with a fuel nozzle (30201); one end of each liquid fuel branch pipe (302) provided with a fuel nozzle (30201) is connected with a liquid fuel pool (303); each liquid fuel pool (303) is correspondingly provided with a driving device (304).
13. The apparatus according to any one of claims 7-12, wherein: the device further comprises a first temperature detection device (401); a first temperature detection device (401) is arranged on the hot air cover (2) of each fuel injection section; the first temperature detection device (401) extends into the hot air hood (2); preferably, the first temperature detection device (401) is arranged at the lower part of the hot air hood (2), namely at the position on the hot air hood (2) close to the sintering charge level;
preferably, a plurality of first temperature detection devices (401) are uniformly arranged at the lower part of each hot air cover (2); preferably, the first temperature detection device (401) is a thermocouple.
14. The apparatus according to any one of claims 7-13, wherein: each heat medium pipeline (L) is provided with a second temperature detection device (402); preferably, each heat medium pipeline (L) is also provided with a flow valve (5); and/or
A third temperature detection device (403) is provided to the liquid fuel header pipe (301) of each liquid fuel injection device (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111045882.XA CN115218652A (en) | 2021-09-07 | 2021-09-07 | Multi-section liquid fuel concurrent heating coupling hot air sintering method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111045882.XA CN115218652A (en) | 2021-09-07 | 2021-09-07 | Multi-section liquid fuel concurrent heating coupling hot air sintering method and device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115218652A true CN115218652A (en) | 2022-10-21 |
Family
ID=83606560
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111045882.XA Pending CN115218652A (en) | 2021-09-07 | 2021-09-07 | Multi-section liquid fuel concurrent heating coupling hot air sintering method and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115218652A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010047812A (en) * | 2008-08-22 | 2010-03-04 | Jfe Steel Corp | Method for operating sintering machine for blowing dilute gaseous fuel, and the same machine |
| CN102239271A (en) * | 2008-12-03 | 2011-11-09 | 杰富意钢铁株式会社 | Process for producing sintered ore and sintering apparatus |
| JP2011252665A (en) * | 2010-06-02 | 2011-12-15 | Jfe Steel Corp | Sintering machine and method for producing sintered ore |
| CN111505199A (en) * | 2020-04-26 | 2020-08-07 | 武汉理工大学 | Device and method for measuring combustion condition parameters of liquid fuel |
| CN112048617A (en) * | 2020-09-08 | 2020-12-08 | 中南大学 | Liquid-gas two-phase medium coupling partition blowing sintering method and blowing device |
| CN112725615A (en) * | 2020-12-22 | 2021-04-30 | 中冶长天国际工程有限责任公司 | Soaking sintering method based on layered composite heat supply |
| CN113091453A (en) * | 2020-01-09 | 2021-07-09 | 中南大学 | Energy-carrying composite gas medium sintering cooperative emission reduction method |
-
2021
- 2021-09-07 CN CN202111045882.XA patent/CN115218652A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010047812A (en) * | 2008-08-22 | 2010-03-04 | Jfe Steel Corp | Method for operating sintering machine for blowing dilute gaseous fuel, and the same machine |
| CN102239271A (en) * | 2008-12-03 | 2011-11-09 | 杰富意钢铁株式会社 | Process for producing sintered ore and sintering apparatus |
| JP2011252665A (en) * | 2010-06-02 | 2011-12-15 | Jfe Steel Corp | Sintering machine and method for producing sintered ore |
| CN113091453A (en) * | 2020-01-09 | 2021-07-09 | 中南大学 | Energy-carrying composite gas medium sintering cooperative emission reduction method |
| CN111505199A (en) * | 2020-04-26 | 2020-08-07 | 武汉理工大学 | Device and method for measuring combustion condition parameters of liquid fuel |
| CN112048617A (en) * | 2020-09-08 | 2020-12-08 | 中南大学 | Liquid-gas two-phase medium coupling partition blowing sintering method and blowing device |
| CN112725615A (en) * | 2020-12-22 | 2021-04-30 | 中冶长天国际工程有限责任公司 | Soaking sintering method based on layered composite heat supply |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8685120B2 (en) | Method and apparatus to produce synthetic gas | |
| TWI454641B (en) | Method for gasification and a gasifier | |
| CN104312634B (en) | A kind of combined type Hot oxygen nozzle and its application | |
| EP2748547B1 (en) | Apparatus and method for the thermal treatment of lump or agglomerated material | |
| CN207455621U (en) | A kind of lower heat of combustion coal gas obtains the high effective flue gas furnace apparatus of high wind-warm syndrome | |
| CN202881205U (en) | Multi-pipeline combined-type gasification nozzle | |
| CN101473048A (en) | Direct smelting plant with waste heat recovery unit | |
| CN105885893A (en) | Internal and external heating coal dry distillation device and dry distillation method thereof | |
| US20100107939A1 (en) | Treatment method for high-temperature exhaust gas | |
| CN100498069C (en) | Circulating fluid bed boiler for mixing, burning and blowing air | |
| CN115218652A (en) | Multi-section liquid fuel concurrent heating coupling hot air sintering method and device | |
| CN107941030B (en) | Primary air injection structure and process of rotary kiln waste gas treatment device | |
| CN203960148U (en) | A kind of airflow bed gasification furnace | |
| CN216245583U (en) | Liquid fuel concurrent heating coupling hot air sintering device | |
| CN115218653A (en) | Liquid fuel concurrent heating coupling hot air sintering device and method thereof | |
| CN110608438A (en) | Multi-stage burner, molten steel tank preheating equipment and using method thereof | |
| CN205933751U (en) | Inside and outside hot type coal dry distillation device | |
| CN211902948U (en) | Burning and recycling device for electrical tar precipitator of roasting furnace | |
| CN212719740U (en) | Multi-stage combustor and molten steel tank preheating equipment adopting same | |
| CN106017093A (en) | Roasting device used for preparing rare-earth oxides | |
| CN207741586U (en) | A kind of First air ejection structure of processing rotary kiln exhaust device | |
| CN207741587U (en) | A kind of device of processing vanadium titanium reduction rotary kiln exhaust gas | |
| RU2460014C1 (en) | Water-coal fuel combustion device | |
| CN209802111U (en) | Direct evaporative cooling device for treating dioxin in electric furnace | |
| CN216845691U (en) | Gas fuel combustion system for high-temperature calcination |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |