CN110579113A - Sintering machine exhaust gas recycling system - Google Patents
Sintering machine exhaust gas recycling system Download PDFInfo
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- CN110579113A CN110579113A CN201910939481.5A CN201910939481A CN110579113A CN 110579113 A CN110579113 A CN 110579113A CN 201910939481 A CN201910939481 A CN 201910939481A CN 110579113 A CN110579113 A CN 110579113A
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- pipeline
- exhaust
- flue gas
- gas
- sintering machine
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- 238000005245 sintering Methods 0.000 title claims abstract description 94
- 238000004064 recycling Methods 0.000 title claims abstract description 41
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 90
- 239000003546 flue gas Substances 0.000 claims abstract description 89
- 239000007789 gas Substances 0.000 claims abstract description 59
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 56
- 239000001301 oxygen Substances 0.000 claims abstract description 56
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 56
- 239000002912 waste gas Substances 0.000 claims abstract description 51
- 230000007246 mechanism Effects 0.000 claims abstract description 21
- 230000001502 supplementing effect Effects 0.000 claims abstract description 16
- 239000000428 dust Substances 0.000 claims description 23
- 238000011084 recovery Methods 0.000 claims description 23
- 238000005192 partition Methods 0.000 claims description 14
- 238000009826 distribution Methods 0.000 claims description 9
- 239000000779 smoke Substances 0.000 claims description 8
- 125000004122 cyclic group Chemical group 0.000 claims description 6
- 239000002918 waste heat Substances 0.000 claims description 5
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 4
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 4
- 239000012528 membrane Substances 0.000 claims description 3
- 230000001706 oxygenating effect Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 37
- 230000008569 process Effects 0.000 abstract description 28
- 230000009467 reduction Effects 0.000 abstract description 25
- 239000003344 environmental pollutant Substances 0.000 abstract description 18
- 231100000719 pollutant Toxicity 0.000 abstract description 16
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 12
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 description 11
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 7
- 230000001105 regulatory effect Effects 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 6
- 230000008901 benefit Effects 0.000 description 6
- 238000001514 detection method Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 239000013589 supplement Substances 0.000 description 5
- 230000006872 improvement Effects 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 3
- 239000004449 solid propellant Substances 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000012806 monitoring device Methods 0.000 description 2
- 238000002203 pretreatment Methods 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 231100000957 no side effect Toxicity 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
-
- 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
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
Landscapes
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention relates to the field of waste gas treatment equipment of sintering machines, in particular to a waste gas recycling system of a sintering machine, which comprises a recycling pipeline, wherein the recycling pipeline is connected with a plurality of exhaust branch pipes in an exhaust branch pipe group, the other end of the recycling pipeline is connected with a flue gas hood, the flue gas hood is positioned above the sintering machine, the recycling pipeline is also connected with an oxygen supply mechanism for supplementing oxygen, the oxygen supply mechanism comprises an oxygen supply pipeline, and the oxygen supply pipeline is connected with an oxygen supply part. The invention discloses a sintering machine waste gas recycling system, which optimizes the air inflow and secondary oxygen supply of the recycling system; the method can realize the maximum recycling of the sintering main exhaust gas and realize the process emission reduction of multiple pollutants by combining the characteristics of the sintering process.
Description
Technical Field
The invention relates to the field of sintering machine waste gas treatment equipment, in particular to a sintering machine waste gas recycling system.
Background
The sintering process in the steel industry is suitable for treating a large amount of iron powder ores, has low cost and strong practicability, and is a main raw material supply mode for blast furnace smelting at present. But also has the problems of high energy consumption, large exhaust emission pollution and the like.
Nowadays, national standards for the emission of pollutants in the steel industry are continuously improved, and the emission of main waste gas of a head of a sintering industry is required to meet the requirement of ultra-clean emission in 2020 (under the condition that the oxygen content is 16%, particulate matters are less than 10mg/m, SO2 is less than 35mg/m, and NOx is less than 50 mg/m).
At present, almost all sintering systems cannot be achieved, and the existing sintering emission reduction system needs to be subjected to large-scale technical transformation. Many steel enterprises are paying attention to find new ultra-low emission technologies.
From the current various air pollution treatment technologies, two feasible technical paths for realizing the ultralow emission of the smoke of the steel sintering machine head are provided: the method comprises the following steps of firstly, processing by a four-electric-field efficient electrostatic dust collector, an activated carbon desulfurization and denitrification integrated device and a bag type dust collector; the method comprises the following steps of firstly, preparing a flue gas by using a lime-gypsum method, then, preparing a wet electrostatic dust collector, then, preparing a selective de-whitening device, then, preparing a semi-dry desulfurization device and then, preparing a bag type dust collector, and finally, preparing a flue gas by using a high-efficiency electrostatic dust collector, a flue gas heating device, a medium-high temperature SCR denitration device and a flue gas heat exchange device.
The two technical paths belong to the mature technology at present, and as long as the design specification and the engineering quality are over-limit, the ultralow emission of the smoke of the head of the steel sintering machine can be completely realized, and the emission of atmospheric pollutants of steel enterprises can be obviously reduced.
However, the above two technical routes not only have huge one-time fixed investment cost (at least 2 million yuan), but also have high operation cost (the cost is increased by at least 20 yuan per ton of ore), and have some by-product harmful wastes (low-concentration sulfuric acid and catalyst) which are inconvenient to treat. In addition, the pollution treatment process routes of the two waste gases have less pollution effects on CO and dioxin in the sintering waste gas.
There is a need for a new type of equipment or method for treating sintering machine exhaust or flue gases.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a sintering machine waste gas recycling system.
In order to achieve the purpose, the invention adopts the technical scheme that:
The utility model provides a sintering machine exhaust gas circulation utilizes system, the sintering machine is connected with the main big flue of taking out, and the main big flue of taking out is connected through exhaust branch group with the sintering machine, exhaust branch group is including a plurality of exhaust branch, exhaust branch group is close to sintering machine ignition end one side and is connected with exhaust gas circulation utilizes system, exhaust gas circulation utilizes system includes the return line, a plurality of exhaust branch in return line and the exhaust branch group are connected, and the other end is connected with the flue gas cover, the flue gas cover is in the sintering machine top, the return line still is connected with the oxygen suppliment mechanism that is used for oxygenating, oxygen suppliment mechanism includes the oxygen suppliment pipeline, the oxygen suppliment pipeline is connected with the.
The recovery pipeline is connected with the flue gas hood through the distribution branch pipe; the distribution branch pipe comprises a main pipe connected with the recovery pipeline, and a plurality of branch pipes are connected to the main pipe; a plurality of baffle plates are arranged in the flue gas hood, and the baffle plates divide the inner cavity of the flue gas hood into a plurality of independent chambers; at least one branch conduit is connected in each chamber.
The waste gas recycling system also comprises a flue gas pipeline, and the flue gas pipeline is arranged at one end of the recovery pipeline, which is far away from the flue gas hood; the side surface of the flue gas pipeline is connected with a plurality of air exhaust branch pipes.
The flue gas pipeline is connected from a second air exhaust branch pipe of the air exhaust branch pipe group close to the ignition end of the sintering machine.
The flue gas pipeline is connected with a pre-dust remover, and the pre-dust remover is connected with a circulating fan; and the circulating fan and the pre-dust remover are connected in series on the recovery pipeline.
The flue gas pipeline comprises a shell, the shell comprises an upper shell and a lower shell, and the edges of the upper shell and the lower shell are connected through bolts; a partition plate is transversely arranged at the joint of the upper shell and the lower shell; the partition plate divides the inside of the shell into a lower cavity and an upper cavity, and the end part of the air exhaust branch pipe connected with the flue gas pipeline penetrates through the upper cavity of the shell to extend to the lower cavity of the shell; the partition plate is provided with a plurality of circulation holes for circulating waste gas.
And a PTFE air filtering membrane is arranged at the lower end of the partition plate.
At least one of the air exhaust branch pipes connected with the flue gas pipeline is provided with a three-way valve; the three-way valve is communicated with the main smoke exhaust channel through a branch pipeline.
The waste gas recycling system further comprises a gas supplementing mechanism, the gas supplementing mechanism comprises a gas supplementing pipeline, and the gas supplementing pipeline is connected with a gas supply part.
And a waste heat utilization device is arranged in the main smoke exhaust duct.
The invention has the advantages that:
The invention discloses a sintering machine waste gas recycling system, which is an improvement on the traditional circulating system and is characterized in that the air inflow and secondary oxygen supply of the recycling system are optimized; the method can realize the maximum cyclic utilization of the sintering main exhaust gas and realize the emission reduction of multi-pollutant processes (NOX, dioxin, CO and the like) by combining the characteristics of the sintering process; thereby reducing the total emission amount of the main exhaust gas, reducing the content indexes of dioxin and CO in the existing exhaust gas of the sintering system and protecting the environment.
Drawings
The following is a brief description of the various views of the present specification:
fig. 1 is a piping layout of the present invention.
Fig. 2 is a schematic structural view of a flue gas duct in the present invention.
Detailed Description
The following description of preferred embodiments of the invention will be made in further detail with reference to the accompanying drawings.
The waste gas recycling system for the sintering machine 1 comprises a main exhaust flue 3 connected with the sintering machine 1, wherein the main exhaust flue 3 is connected with the sintering machine 1 through an exhaust branch pipe group, the exhaust branch pipe group comprises a plurality of exhaust branch pipes 2, one side, close to an ignition end of the sintering machine 1, of the exhaust branch pipe group is connected with the waste gas recycling system, the waste gas recycling system comprises a recovery pipeline 7, the recovery pipeline 7 is connected with the plurality of exhaust branch pipes 2 in the exhaust branch pipe group, the other end of the recovery pipeline is connected with a flue gas hood 8, the flue gas hood 8 is located above the sintering machine 1, the recovery pipeline 7 is further connected with an oxygen supply mechanism 9 for supplying oxygen, the oxygen supply mechanism 9 comprises an oxygen supply pipeline, and the oxygen supply pipeline is connected with an oxygen; the invention discloses a waste gas recycling system of a sintering machine 1, which is an improvement on the traditional circulating system and is characterized in that the air inflow and the secondary oxygen supply of the recycling system are optimized; the method can realize the maximum cyclic utilization of the sintering main exhaust gas and realize the emission reduction of multi-pollutant processes (NOX, dioxin, CO and the like) by combining the characteristics of the sintering process; thereby reducing the total emission amount of the main exhaust gas, reducing the content indexes of dioxin and CO in the existing exhaust gas of the sintering system and protecting the environment; through the structure, the invention is equivalent to providing a process emission reduction application system for recycling the sintering main exhaust waste gas; the emission reduction of pollutants in waste gas is realized through the self circulation of the sintering process, the maximum (more than 40%) emission reduction of flue gas of a sintering system is realized under the condition that the production process of sintering is not influenced, and particularly, the method aims at pollutants such as NOX, dioxin, CO and the like which can be reduced in the process. The post-treatment of the sintering main exhaust gas is changed into pre-treatment; realizing remarkable economic benefits (primary investment and operation investment) of emission reduction and remarkable social benefits (reducing the total pollution of the system and reducing the waste generated by treatment); the device has great values of emission reduction, energy conservation, popularization and application, and is provided with an oxygen supply mechanism 9; the setting of oxygen suppliment mechanism 9 can be better with the waste gas mixture, guarantees to the reburning of pollutants such as NOX, dioxin, CO in the waste gas to better realization above-mentioned purpose.
Preferably, in the invention, the recovery pipeline 7 is connected with the flue gas hood 8 through a distribution branch pipe; the distribution branch pipe comprises a main pipe 11 connected with the recovery pipe 7, and a plurality of branch pipes 111 are connected to the main pipe 11; through the arrangement of the distribution branch pipes, the mixed gas of the waste gas and the oxygen can be filled in the whole inner cavity of the flue gas hood 8, and the waste gas and the oxygen are prevented from being concentrated at a certain position in the flue gas hood 8 when the flue gas hood 8 is directly connected with the recovery pipeline 7; in addition, in the invention, a plurality of baffle plates 81 are arranged in the flue gas cover 8, and the baffle plates 81 divide the inner cavity of the flue gas cover 8 into a plurality of independent cavities; at least one branch pipe 111 is connected in each chamber; such setting for a plurality of solitary cavities of the inside zinc layer of flue gas cover 8 for can not influence each other when the gas mixture that oxygen and waste gas in each cavity formed burns, make things convenient for the independent burning of each cavity gas mixture.
preferably, the waste gas recycling system further comprises a flue gas pipeline 4, and the flue gas pipeline 4 is arranged at one end, far away from the flue gas hood 8, of the recovery pipeline 7; the side surface of the flue gas pipeline 4 is connected with a plurality of air exhaust branch pipes; flue gas pipeline 4 size is great, plays the effect of preliminary storage waste gas, makes things convenient for the waste gas in each branch of bleeding to mix in flue gas pipeline 4, makes things convenient for the cyclic utilization system simultaneously and bleeds being connected between the branch group.
Preferably, in the present invention, the flue gas pipeline 4 is connected from the second exhaust branch pipe of the exhaust branch pipe group near the ignition end of the sintering machine 1; this arrangement is because the firing end of the sintering machine 1 is not suitable for connection to an exhaust gas circulation system because it is just starting to burn and generates less exhaust gas.
Preferably, the flue gas pipeline 4 is connected with a pre-dust remover 5, and the pre-dust remover 5 is connected with a circulating fan 6; the circulating fan 6 and the pre-dust remover 5 are connected in series on the recovery pipeline 7; the arrangement of the circulating fan 6 can realize that the waste gas in the flue gas pipeline 4 is extracted into the flue gas hood 8, wherein the circulating fan 6 mainly plays a role in carrying, mainly aims at supplying the waste gas to the flue gas hood 8, the pre-dust remover 5 plays a role in dust removal, mainly aims at playing a role in dust removal, and the arrangement is a conventional arrangement and belongs to the known technology.
Preferably, the flue gas duct 4 of the present invention comprises a housing, the housing comprises an upper housing 41 and a lower housing 42, and the edges of the upper housing 41 and the lower housing 42 are connected by bolts; a partition plate 43 is transversely arranged at the joint of the upper shell 41 and the lower shell 42; the division plate 43 divides the inner part of the shell into a lower chamber and an upper chamber, and the end part of the air exhaust branch pipe connected with the flue gas pipeline 4 penetrates through the upper chamber of the shell to extend to the lower chamber of the shell; a plurality of circulation holes 431 for circulating the exhaust gas are arranged on the partition plate 43; the flue gas pipeline 4 is divided into an upper layer and a lower layer; through the arrangement of the partition plate 43, the partition plate 43 has a certain blocking effect, and can remove impurities from the waste gas entering the flue gas pipeline 4 from the air exhaust branch pipe; reducing the access to the recovery conduit 7.
Preferably, in the present invention, a PTFE air filter 44 is provided at the lower end of the partition plate 43; due to the arrangement of the PTFE air filtering membrane 44, impurities in the waste gas can be better filtered, and the existence of impurities in the recovery pipeline 7 is reduced; in order to facilitate the discharge of impurities, a discharge port is arranged at the lower end of the flue gas pipeline 4, and a sealing plug is arranged in the discharge port.
Preferably, in the invention, at least one of the air exhaust branch pipes connected with the flue gas pipeline 4 is provided with a three-way valve 13; the three-way valve 13 is communicated with the main large smoke exhaust duct 3 through a branch pipeline; the three-way valve 13 can be used for regulating and controlling the amount of the waste gas entering the flue gas pipeline 4, so that excessive waste gas is prevented from entering the flue gas hood 8; thereby avoiding excessive exhaust gas escaping from the hood 8.
Preferably, the waste gas recycling system further comprises a gas supplementing mechanism 10, wherein the gas supplementing mechanism 10 comprises a gas supplementing pipeline, the gas supplementing pipeline is connected with a gas supply part, and the gas supplementing pipeline is connected with the recovery pipeline 7; the connection of the gas supplementing pipeline and the oxygen supply pipeline with the recovery pipeline 7 can adopt the arrangement mode as shown in the attached drawing, and can be specifically set according to the requirements; in the invention, pollutants such as NOX, SO2, CO and the like in the sintering main exhaust gas mainly come from the sintering solid fuel, and the total amount of the pollutants can be reduced by reducing the consumption of the sintering solid fuel; the invention adds a gas supplementing mechanism 10, and utilizes the added combustible gas to feed energy into the upper combustion layer and prolong the surface heat preservation time, thereby achieving the purposes of reducing the solid fuel consumption, improving the sintering yield and reducing the pollutant emission; the spraying in this way can ensure the combustible gas to be uniform and lossless, and the structure is simple and reliable.
The oxygen supply pipeline and the fuel gas supplement pipeline are provided with a regulating valve and a flowmeter, and the regulating valve comprises: an oxygen manifold electric regulating valve 92 or a gas manifold electric regulating valve 102; the flow meter is as follows: an oxygen manifold flow meter 91 or a gas manifold flow meter 103; meanwhile, an oxygen shut-off valve 93 is arranged on the oxygen supply pipeline, and a gas shut-off valve 101 is arranged on the gas supplement pipeline.
Preferably, in the invention, a waste heat utilization device 12 is arranged in the main exhaust large flue 3; the waste heat utilization device mainly comprises a flue gas heat recovery heat exchanger; the flue gas heat recovery heat exchanger is a common device, belongs to the known technology and is not described again; the waste heat utilization device 12 is provided here and used as an optimized solution.
The invention mainly aims to maximize the emission reduction of waste gas. Breaks through the limit of the prior art and realizes the effective emission reduction of the maximum flue gas. The total emission amount of the flue gas in the sintering process is reduced, NOx is taken as a main emission reduction object, emission reduction of pollutants such as dioxin, particles, CO and the like is considered, the dioxin and the NOx are partially eliminated in a circulating mode through the circulating sintering process, generation of the NOx is inhibited, and emission reduction of each pollutant in the flue gas in the process is realized; the oxygen-enriched air-assisted sintering method has the advantages that oxygen-enriched supplement is arranged to adjust oxygen in the circulating waste gas, so that the oxygen concentration in the circulating waste gas is ensured, the demand of the sintering process on the oxygen is ensured by combining with on-line oxygen content monitoring, and the sintering process is purposefully realized and optimized; in addition, the invention is also an improvement on the prior art, the structure of the traditional structure is slightly changed, the system is externally provided with a flue gas circulating system, the improvement is convenient, and the production interference is less; and no side effect is generated in the sintering process by the pretreatment (dust reduction and oxygen supplement) of the circulating flue gas.
The invention aims to provide a process emission reduction application system for recycling exhaust gas of a sintering main draft.
So as to realize the emission reduction of pollutants in the waste gas through the self circulation of the sintering process. Under the condition of not influencing the production process of sintering, the maximum (more than 40%) emission reduction of the flue gas of a sintering system is realized, and particularly, pollutants such as NOX, dioxin, CO and the like which can be reduced in the technical process are mainly targeted. The post-treatment of the sintering main exhaust gas is changed into the pre-treatment.
And remarkable economic benefits (primary investment and operation investment) of emission reduction and social benefits (reduction of total pollution generation of a system and reduction of waste generated by treatment) are realized. Has great values of emission reduction, energy conservation, popularization and application.
The data are shown in table 1 in detail in terms of the mechanism of exhaust gas generation in the sinter draw.
Table 1: detection data of partial pollutants in waste gas of 1 air draft branch pipe 2 of certain 300 square meter sintering machine
Note: is greater than the measuring range of the super instrument
On the whole sintering bellows line, the main pollutants of nitrogen oxide, sulfur dioxide and carbon monoxide are generated in large quantities at the beginning of sintering, and the two are gradually reduced at the later stage of the sintering process.
Wherein 16# bellows before 20# bellows at the end point of sintering begins to be obviously reduced, which is mainly influenced by the increase of the proportion of a sintering ore bed, the increase of air quantity (oxygen) in a material bed, the reduction of the generation of nitrogen oxides and the secondary decomposition of part of nitrogen oxides at high temperature.
The oxygen content of the branch pipe waste gas is in a trend from low to high after the charge level is ignited and sintered.
The charge level needs to be supplemented with a large amount of air in the sintering process, and part of oxygen in the charge level is consumed, so that the normal sintering process is obviously influenced by insufficient oxygen. In addition, much dust will significantly deteriorate the sintering process. The oxygen content and dust of the recycled exhaust gas must be regulated and controlled. To ensure proper sintering production.
Because nitrogen oxides, dioxin and carbon monoxide can be decomposed and digested partially or completely through high temperature of sintering, sulfur dioxide can be enriched or captured in sintered ore. The technical system of the invention focuses on the emission reduction and treatment of the first three pollutants.
In order to achieve the aim of maximum process emission reduction, the technical scheme provided by the invention is as follows:
disconnecting a sintering front air box branch pipe (a first air exhaust branch pipe corresponding to an ignition section of an auto-ignition furnace starts to push backwards, and the specific number is calculated according to the size of a sintering machine 1 and the circulating air quantity) from an original main large air exhaust flue 3, connecting a flue gas pipeline 4 of flue gas newly, driving a circulating fan 6 by a recycling system, collecting the circulating waste gas, feeding the collected circulating waste gas into a dust remover to reduce dust, and then sending the collected circulating waste gas into a flue gas hood 8 above a sintering trolley to circulate; the flue gas hood 8 fully covers the sintering table top, the partition plate 43 is arranged in the middle of the flue gas hood, and the tail flue gas hood is openable, so that the trolley is convenient to overhaul;
In order not to influence the sintering process, the invention is provided with an oxygen supply mechanism 9; an oxygen supply mechanism 9 is arranged to supplement the oxygen content in the flue gas hood 8, and the on-line oxygen analyzer on the pipeline is used for carrying out feedback adjustment according to production requirements. Therefore, the sintering production is met, and the flue gas circulation can be realized to the maximum extent.
The smoke cover 8 is provided with a negative pressure detection device and a CO concentration detection device 82, wherein the negative pressure detection device and the CO concentration detection device 82 both belong to the known technology; and will not be described in detail herein.
In addition, at least one of the exhaust branch pipes in the exhaust branch pipe group connected with the flue gas pipeline 4 is provided with a three-way valve 13, and the arrangement can control the circulating flue gas amount by adjusting the trend of the waste gas in the three-way valve 13, so that the interior of the flue gas hood 8 is ensured to be in a micro negative pressure state, and mixed flue gas in the hood is prevented from leaking.
In addition, a heat energy recovery system is arranged in the original main extraction flue 3 to recover high-temperature waste gas.
Example 1: the recycling system is connected with a plurality of air exhaust branch pipes 2 at the lower part of the sintering machine 1 through flue gas pipelines 4, and the first air exhaust branch pipe corresponding to the ignition section is still connected with the main air exhaust pipeline; and waste gas in the recycling system is driven by a circulating fan 6, and the circulating waste gas is pretreated by a dust remover and then conveyed into a flue gas hood 8 above the sintering machine 1 for distribution and recycling.
The recycling pipeline 7 is provided with a cut-off valve 14, an oxygen supply mechanism 9 is arranged behind the cut-off valve, the oxygen supply pipeline is communicated with the recycling pipeline 7, and the oxygen content of the waste gas in the smoke hood can be adjusted and supplemented by closing an adjusting valve and a flowmeter on the online oxygen detector 71 and the oxygen supply pipeline of the recycling pipeline 7, so that the production requirement of the sintering process is met.
The branch pipe 111 is provided with a flow rate control valve 112 for controlling the distribution of the circulating flue gas in each stage.
The pressure detection and CO monitoring device 82 is arranged outside the flue gas hood 8, the interior of the flue gas hood 8 can be in a micro negative pressure state by adjusting the three-way valve 13 and the regulating valves of the circulating waste gas branch pipes, and waste gas does not overflow.
The CO monitoring device 82 provides a safe CO concentration warning for the tabletop.
It is clear that the specific implementation of the invention is not restricted to the above-described embodiments, but that various insubstantial modifications of the inventive process concept and technical solutions are within the scope of protection of the invention.
Claims (10)
1. The utility model provides a sintering machine exhaust gas cyclic utilization system, the sintering machine is connected with the main big flue of taking out, and the main big flue of taking out is connected through exhaust branch group with the sintering machine, exhaust branch group is including a plurality of exhaust branch, its characterized in that, exhaust branch group is close to sintering machine ignition end one side and is connected with exhaust gas cyclic utilization system, exhaust gas cyclic utilization system includes the return line, a plurality of exhaust branch in return line and the exhaust branch group are connected, and the other end is connected with the flue gas cover, the flue gas cover is in the sintering machine top, the return line still is connected with the oxygen suppliment mechanism that is used for oxygenating, oxygen suppliment mechanism includes the oxygen supply pipeline, the oxygen suppliment pipeline is connected with the.
2. The exhaust gas recycling system of the sintering machine according to claim 1, wherein the recycling pipeline is connected with a flue gas hood through a distribution branch pipe; the distribution branch pipe comprises a main pipe connected with the recovery pipeline, and a plurality of branch pipes are connected to the main pipe; a plurality of baffle plates are arranged in the flue gas hood, and the baffle plates divide the inner cavity of the flue gas hood into a plurality of independent chambers; at least one branch conduit is connected in each chamber.
3. the exhaust gas recycling system of the sintering machine according to claim 1, further comprising a flue gas duct disposed at an end of the recovery duct away from the flue gas hood; the side surface of the flue gas pipeline is connected with a plurality of air exhaust branch pipes.
4. The exhaust gas recycling system of the sintering machine according to claim 1, wherein the flue gas pipeline is connected from the second branch exhaust pipe of the branch exhaust pipe set near the ignition end of the sintering machine.
5. The sintering machine exhaust gas recycling system according to claim 1, wherein the flue gas pipeline is connected with a pre-dust collector, and the pre-dust collector is connected with a circulating fan; and the circulating fan and the pre-dust remover are connected in series on the recovery pipeline.
6. The exhaust gas recycling system of the sintering machine according to claim 3, wherein the flue gas duct comprises a housing, the housing comprises an upper housing and a lower housing, and the edges of the upper housing and the lower housing are connected through bolts; a partition plate is transversely arranged at the joint of the upper shell and the lower shell; the partition plate divides the inside of the shell into a lower cavity and an upper cavity, and the end part of the air exhaust branch pipe connected with the flue gas pipeline penetrates through the upper cavity of the shell to extend to the lower cavity of the shell; the partition plate is provided with a plurality of circulation holes for circulating waste gas.
7. The exhaust gas recycling system of the sintering machine according to claim 6, wherein the lower end of the partition plate is provided with a PTFE air filter membrane.
8. The system of claim 1, wherein a three-way valve is provided on at least one of the exhaust branches connected to the flue gas duct; the three-way valve is communicated with the main smoke exhaust channel through a branch pipeline.
9. the exhaust gas recycling system of a sintering machine according to claim 1, further comprising a gas supplementing mechanism, wherein the gas supplementing mechanism comprises a gas supplementing pipeline, and a gas supply part is connected to the gas supplementing pipeline.
10. The exhaust gas recycling system of the sintering machine according to claim 1, wherein a waste heat utilization device is arranged in the main exhaust flue.
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| CN201910939481.5A CN110579113A (en) | 2019-09-30 | 2019-09-30 | Sintering machine exhaust gas recycling system |
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Cited By (1)
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| CN117249691A (en) * | 2023-09-15 | 2023-12-19 | 河北富莱尔环保节能工程有限公司 | Sintering flue gas circulating purification emission reduction process and system |
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