CN116929053B - Clay calcination color control method - Google Patents
Clay calcination color control method Download PDFInfo
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- CN116929053B CN116929053B CN202310941753.1A CN202310941753A CN116929053B CN 116929053 B CN116929053 B CN 116929053B CN 202310941753 A CN202310941753 A CN 202310941753A CN 116929053 B CN116929053 B CN 116929053B
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- temperature
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- flue gas
- fuel
- rotary kiln
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- 238000001354 calcination Methods 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 43
- 239000004927 clay Substances 0.000 title claims abstract description 30
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 104
- 239000003546 flue gas Substances 0.000 claims abstract description 104
- 239000000463 material Substances 0.000 claims abstract description 103
- 239000000446 fuel Substances 0.000 claims abstract description 89
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 89
- 239000007789 gas Substances 0.000 claims abstract description 72
- 238000005507 spraying Methods 0.000 claims abstract description 62
- 238000002485 combustion reaction Methods 0.000 claims abstract description 38
- 239000000428 dust Substances 0.000 claims abstract description 36
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 32
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 32
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 32
- 238000006243 chemical reaction Methods 0.000 claims abstract description 16
- 239000003345 natural gas Substances 0.000 claims abstract description 16
- 239000002803 fossil fuel Substances 0.000 claims abstract description 11
- 238000001816 cooling Methods 0.000 claims description 22
- 239000002994 raw material Substances 0.000 claims description 22
- 238000007599 discharging Methods 0.000 claims description 19
- 239000002912 waste gas Substances 0.000 claims description 19
- 230000008569 process Effects 0.000 claims description 13
- 230000003009 desulfurizing effect Effects 0.000 claims description 11
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 10
- 229910052760 oxygen Inorganic materials 0.000 claims description 10
- 239000001301 oxygen Substances 0.000 claims description 10
- 239000000779 smoke Substances 0.000 claims description 8
- 239000007921 spray Substances 0.000 claims description 6
- 239000012855 volatile organic compound Substances 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 3
- 239000003570 air Substances 0.000 description 21
- 229910002091 carbon monoxide Inorganic materials 0.000 description 19
- 239000004568 cement Substances 0.000 description 12
- 230000000694 effects Effects 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 4
- 235000011941 Tilia x europaea Nutrition 0.000 description 4
- 239000004571 lime Substances 0.000 description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 3
- 229910001579 aluminosilicate mineral Inorganic materials 0.000 description 3
- 229910052804 chromium Inorganic materials 0.000 description 3
- 239000011651 chromium Substances 0.000 description 3
- 229930195733 hydrocarbon Natural products 0.000 description 3
- 150000002430 hydrocarbons Chemical class 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000002845 discoloration Methods 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- -1 nitrogen hydrocarbons Chemical class 0.000 description 2
- 239000003473 refuse derived fuel Substances 0.000 description 2
- 239000003469 silicate cement Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 description 1
- 229910001021 Ferroalloy Inorganic materials 0.000 description 1
- 239000002253 acid Chemical class 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 235000012501 ammonium carbonate Nutrition 0.000 description 1
- 239000001099 ammonium carbonate Substances 0.000 description 1
- 229910001570 bauxite Inorganic materials 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 150000001722 carbon compounds Chemical class 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 150000001805 chlorine compounds Chemical class 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910000514 dolomite Inorganic materials 0.000 description 1
- 239000010459 dolomite Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 150000002170 ethers Chemical class 0.000 description 1
- 150000008282 halocarbons Chemical class 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- UGKDIUIOSMUOAW-UHFFFAOYSA-N iron nickel Chemical compound [Fe].[Ni] UGKDIUIOSMUOAW-UHFFFAOYSA-N 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000003209 petroleum derivative Chemical class 0.000 description 1
- 125000001997 phenyl group Chemical class [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 238000006552 photochemical reaction Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
- F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
- F27B7/42—Arrangement of controlling, monitoring, alarm or like 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
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
- F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
-
- 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
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
- F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
- F27B7/33—Arrangement of devices for discharging
-
- 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
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
- F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
- F27B7/38—Arrangements of cooling 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
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning 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
- F27M2003/03—Calcining
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Muffle Furnaces And Rotary Kilns (AREA)
Abstract
The invention provides a clay calcination color control method, which comprises the steps of firstly introducing natural gas fuel into a first fuel inlet for combustion to provide all heat for ignition and kiln starting, and then respectively introducing traditional fossil fuel and RDF fuel into a second fuel inlet and a third fuel inlet for combustion to provide calcination heat for a rotary kiln; the kiln tail high-temperature flue gas generated during calcination is cooled to become low-temperature mixed gas with the temperature of 70-80 ℃, and the low-temperature mixed gas is circulated into a cooler; when the high Wen Chuyao material enters the cooler, heat exchange is carried out between the high Wen Chuyao material and the low-temperature mixed gas which is circulated into the cooler, and water is sprayed by a water spraying device; the dust containing carbon is reacted with low temperature mixed gas, water is sprayed to produce Boolean reaction, water gas reaction produces more reducing gas and the reducing gas is sent to the kiln head, the combustion chamber and the main burner of the rotary kiln to ensure the calcining atmosphere in the rotary kiln as reducing atmosphere. According to the method provided by the invention, the color of the calcined material can be ensured to be gray.
Description
Technical Field
The invention relates to the technical field of clay calcination, in particular to a clay calcination color control method.
Background
It is counted that the carbon emission of the cement industry is about 7% of the carbon emission worldwide, and the carbon emission of the cement industry in China is about 13% of the carbon emission in the whole society. Wherein, a great part of cement produced in China is silicate cement. At present, aluminosilicate minerals replace the traditional silicate cement clinker to realize low carbon emission, and the main component of clay is the aluminosilicate minerals, so that a feasible way for obtaining the aluminosilicate minerals is obtained by calcining the clay. The calcination apparatus commonly used in industry is a rotary kiln.
In the process of implementing the present invention, the inventor finds that at least the following problems exist in the prior art:
In the calcined clay production process, if the iron oxide contained in the components exceeds 5% by weight, the produced calcined clay product may appear as a reddish brown color, and may affect the color of LC3 cement after mixing with cement clinker. In addition, in the field, the flue gas or waste gas generated by calcination is simply treated by filtration, adsorption and the like and then discharged into the atmosphere, so that the pollution degree is reduced, but the problem of resource waste exists to a certain extent.
There is therefore a need for a clay calcination color control method that at least partially addresses the above-described technical problems.
Disclosure of Invention
The embodiment of the invention provides a clay calcination color control method, which can ensure that the color of calcined materials is gray.
The invention provides a clay calcination color control method, which comprises a clay calcination system, wherein the system comprises a rotary kiln, a flue gas treatment device, a cooler and a water spraying device; the kiln tail of the rotary kiln is provided with a raw material inlet and a first smoke outlet, the raw material inlet is used for introducing raw materials to be calcined, and the first smoke outlet is used for guiding out high-temperature smoke generated during calcination;
The kiln head of the rotary kiln is communicated with a combustion chamber, and the combustion chamber is provided with a main burner, wherein the main burner is provided with a first fuel inlet for introducing natural gas fuel and a first air inlet for introducing air; the combustor having a second fuel inlet for introducing conventional fossil fuel, a third fuel inlet for introducing RDF fuel, and a second air inlet for introducing air; the refuse derived fuel (Refuse Derived Fuel, abbreviated as RDF) is a fuel produced by crushing, sorting, drying, adding a chemical agent, compression molding, and the like, of combustible refuse. RDF fuel has the characteristics of high heat value and stable combustion.
The flue gas treatment device is used for carrying out cooling treatment on the high-temperature flue gas guided out through the first flue gas outlet, and the low-temperature flue gas formed after treatment is communicated to the cooler through a circulating pipeline; and
The inlet end of the cooler is provided with a kiln outlet material inlet and a second flue gas outlet; the kiln outlet material inlet is communicated to a discharging point of the kiln head of the rotary kiln through a connecting pipeline and is used for introducing unburnt or burnt dust containing carbon of high Wen Chuyao materials and RDF fuel calcined by the rotary kiln; the second flue gas outlet is respectively communicated to the kiln head of the rotary kiln, the first air inlet and the second air inlet through pipelines and is used for guiding out reducing gas generated when the dust containing carbon contacts with low-temperature flue gas and the low-temperature flue gas after heat exchange;
The water spraying device is arranged in the cooler and is used for spraying water to cool the high-temperature kiln-discharging material;
wherein the method comprises the steps of:
Firstly, introducing natural gas fuel into a first fuel inlet for combustion to provide all heat for ignition and kiln starting, stopping introducing natural gas after kiln starting, and then respectively introducing traditional fossil fuel and RDF fuel into a second fuel inlet and a third fuel inlet for combustion to provide calcination heat for the rotary kiln, wherein 50% -90% of heat is provided by the RDF fuel;
When the raw materials to be calcined are dehydrated and decomposed in a rotary kiln, the high-temperature flue gas at the kiln tail is processed by a cooling process and then becomes low-temperature mixed gas with the temperature of 70-80 ℃, and the low-temperature mixed gas is circulated into a cooler;
when the calcined high Wen Chuyao material of the rotary kiln enters the cooler, the high-temperature kiln-discharging material exchanges heat with low-temperature mixed gas which is circulated into the cooler, and is sprayed with water by a water spraying device in the cooler, so that the temperature is quickly reduced to below 300 ℃ to ensure that the high Wen Chuyao material is still gray and avoid color change; in the process, unburnt RDF fuel or burnout dust containing carbon enters a cooler along with a high Wen Chuyao material through a blanking point at the head part of the kiln, and reacts with low-temperature mixed gas and water spray to generate Boolean reaction and water gas reaction to generate more reducing gas;
Part of the low-temperature mixed gas after heat exchange and the generated reducing gas enter the kiln head of the rotary kiln, and the other part of the low-temperature mixed gas is sent to a combustion chamber and a main burner which are communicated with the kiln head of the rotary kiln, so that the calcining atmosphere in the rotary kiln is ensured to be a reducing atmosphere.
According to the method, high-temperature flue gas (with very low oxygen content, mainly comprising CO and CO 2) generated during rotary kiln calcination is treated by a flue gas treatment device and then becomes low-temperature flue gas (or waste gas) with low temperature (generally 70-80 ℃), wherein the low-temperature flue gas inherits the oxygen content of the high-temperature flue gas and has the characteristics of a certain amount of CO and CO 2, and after entering a cooler, the low-temperature flue gas is used as cooling air to exchange heat with high-temperature kiln discharge materials (about 600 ℃) to reduce the temperature of high-temperature Wen Chuyao materials for later process use, and on the other hand, CO 2 in the low-temperature flue gas and unreacted carbon in RDF fuel of high-Wen Chuyao materials mixed in a high-temperature state are subjected to Boolean reaction to generate more reducing gas CO; through the above heat exchange, the low-temperature flue gas has more reducing gas CO, the temperature of the low-temperature flue gas is increased (about 200 ℃), the low-temperature flue gas after heat exchange is divided into two parts, one part enters the rotary kiln, the other part goes to the combustion chamber and the main burner, and the calcination atmosphere in the rotary kiln is ensured to be the reducing atmosphere, so that the color of the calcined material is ensured to be grey. Meanwhile, the system of the invention enables the high-temperature flue gas generated during the calcination of the rotary kiln to be recycled, thereby reducing carbon emission. In addition, the low-temperature flue gas has higher temperature (about 200 ℃) than the normal-temperature air, so that the fuel consumption can be reduced.
Simultaneously, when the rotary kiln is ignited and started, the first fuel inlet is utilized to introduce natural gas fuel for combustion to provide all heat for ignition and starting, natural gas is stopped being introduced after the kiln is started, and then the second fuel inlet and the third fuel inlet are respectively introduced with traditional fossil fuel and RDF fuel for combustion to provide calcination heat for the rotary kiln, wherein 50% -90% of heat (accounting for larger heat) is provided by the RDF fuel. The advantages of such a design are: 1. compared with natural gas, the RDF fuel has lower price, thus greatly reducing the cost; 2. the RDF fuel is used as the main fuel after ignition and kiln starting, so that the use of the traditional fossil fuel is effectively reduced, and the effects of energy conservation and emission reduction are further achieved; 3. after the rotary kiln is ignited and started, RDF fuel is used as a main heat source instead, ash (namely dust containing carbon) after the RDF fuel is combusted enters a kiln blanking point and is mixed with the calcined high Wen Chuyao material, and the RDF fuel can also provide a carbon source for the Boolean reaction in the cooler.
Optionally, the flue gas treatment device comprises at least one of the following:
The cyclone separator is used for separating materials and waste gas from the high-temperature flue gas;
the desulfurizing tower is used for desulfurizing the high-temperature flue gas;
the dust collector is used for removing dust from the high-temperature flue gas;
And the RTO device is used for eliminating volatile organic compounds in the high-temperature flue gas.
Optionally, the flue gas treatment device comprises the cyclone separator, the desulfurizing tower, the dust collector and the RTO device (i.e. a thermal storage type thermal incinerator) which are sequentially connected:
the materials separated by the cyclone separator also enter the rotary kiln again through the raw material inlet. And/or
And the material obtained after dust removal by the dust collector also enters the rotary kiln again through the raw material inlet.
Optionally, the water spraying device includes:
The first water spraying device is positioned at the inlet end of the cooler and is used for rapidly cooling the high-temperature kiln-discharging material;
the second water spraying device is positioned at the outlet end of the cooler and used for controlling the temperature of the high-temperature kiln-discharging material passing through the outlet end of the cooler to be lower than a preset threshold value in a linkage mode with the first water spraying device.
In this embodiment, the water spraying device (including the first water spraying device and the second water spraying device) cools the high Wen Chuyao material by spraying water, so as to further enhance the cooling effect of the high Wen Chuyao material. Besides being capable of cooling the high Wen Chuyao material, part of water is changed into water vapor when contacting with the high Wen Chuyao material, and the water vapor reacts with the RDF fuel of the high Wen Chuyao material which is mixed in a high temperature state and is not burnt or unreacted carbon in the burnt dust containing carbon to generate reducing gases CO and H 2, and the generated part of reducing gases CO and H 2 enter the rotary kiln together with low-temperature flue gas after heat exchange and go to a combustion chamber and a main burner respectively, so that the calcination atmosphere in the rotary kiln is further ensured to be a reducing atmosphere, and the color of the calcined material is further ensured to be grey. The first water spraying device at the inlet end of the cooler is used for rapidly cooling the high Wen Chuyao material entering the cooler (the temperature is reduced to below 300 ℃ from the original 600 ℃ or so), so that the discoloration of the calcined material (high-temperature kiln-discharging material) can be avoided. The second water spraying device is used for controlling the first water spraying device in a linkage way, and controlling the temperature of the high Wen Chuyao material passing through the outlet end of the cooler to be below a preset threshold (for example, 80-150 ℃) so as to meet the requirement of the subsequent process. The first water spraying device or the second water spraying device can be provided with a control device or an externally coupled control device, and a temperature sensor which can monitor the temperature of the high Wen Chuyao material passing through the outlet end of the cooler in real time, and the control device adjusts the water spraying flow of the first water spraying device or the second water spraying device according to the comparison result of the temperature value monitored by the temperature sensor and a preset threshold value. When the temperature value monitored by the temperature sensor is larger than a preset threshold value, increasing the water spraying flow of the first water spraying device or the second water spraying device; when the temperature value monitored by the temperature sensor is smaller than a preset threshold value, water spraying of the second water spraying device is reduced; the regulation and control process is a common existing regulation and control technology, does not involve the modification of an internal program, and is based on the function set by the control device.
Optionally, the flue gas treated by the flue gas treatment device is also communicated to a chimney through an exhaust pipeline.
Optionally, an auxiliary burner is further arranged at a position close to the blanking point of the kiln head of the rotary kiln, so that oxygen entering the rotary kiln is further consumed.
The invention has the advantages that by utilizing the technical scheme according to the embodiment of the invention, the invention has at least the following advantages:
1. The high-temperature flue gas generated during the calcination in the rotary kiln is treated by the flue gas treatment device and then is used for cooling the high Wen Chuyao materials again. On the one hand, the low-temperature flue gas after treatment is used as cooling air to reduce the temperature of high Wen Chuyao materials, on the other hand, the low-temperature flue gas after treatment is not burnt out with RDF fuel of high Wen Chuyao materials mixed in a high-temperature state or unreacted carbon in the burnt-out dust containing carbon is subjected to Boolean reaction to generate more reducing gas CO, and the reducing gas CO enters a rotary kiln, a combustion chamber and a main burner to ensure that the calcining atmosphere in the rotary kiln is the reducing atmosphere, so that the color of the calcined materials is gray; in addition, the low-temperature flue gas has higher temperature (about 200 ℃) compared with the normal-temperature air, so that the fuel consumption can be reduced;
2. The inner cavity of the cooler is communicated with a water spraying device for spraying water to cool the high Wen Chuyao material, so that the cooling effect of the high Wen Chuyao material is further enhanced; in addition, part of water is changed into water vapor when contacting with the high Wen Chuyao material, the water vapor and RDF fuel of the high Wen Chuyao material mixed in a high temperature state are not burnt or unreacted carbon in the burnt dust containing carbon are subjected to water gas reaction to generate reducing gases CO and H 2, and then the reducing gases CO and H 2 enter the rotary kiln, the combustion chamber and the main burner, so that the calcination atmosphere in the rotary kiln is further ensured to be a reducing atmosphere, and the color of the calcined material is further ensured to be gray.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and drawings.
It will be appreciated by those skilled in the art that the objects and advantages that can be achieved with the present invention are not limited to the above-described specific ones, and that the above and other objects that can be achieved with the present invention will be more clearly understood from the following detailed description.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate and together with the description serve to explain the application. The components in the figures are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the application. Corresponding parts in the drawings may be exaggerated, i.e. made larger relative to other parts in an exemplary device actually manufactured according to the present application, for convenience in showing and describing some parts of the present application. In the drawings:
FIG. 1 is a flow chart of a clay calcination color control method according to an embodiment of the present invention; and
FIG. 2 is a schematic diagram of a clay calcination system in a clay calcination color control method according to an embodiment of the present invention.
Reference numerals illustrate:
100: a system;
110: a rotary kiln;
111: a raw material inlet;
112: a first flue gas outlet;
113: a combustion chamber;
114: a main burner;
115: a first fuel inlet;
116a: a first air inlet;
116b, a second air inlet;
117: a blanking point;
118: an auxiliary burner;
119a: a second fuel inlet;
119b, a third fuel inlet;
121: a cyclone separator;
122: a desulfurizing tower;
123: a dust collector;
124: an RTO device;
130: a cooler;
131: a kiln outlet material inlet;
132: a second flue gas outlet;
141: a circulation pipe;
142: a connecting pipe;
143: an exhaust duct;
144: a chimney;
151: a first water spraying device;
152: and a second water spraying device.
Detailed Description
The objects and functions of the present invention and methods for achieving these objects and functions will be elucidated by referring to exemplary embodiments. However, the present invention is not limited to the exemplary embodiments disclosed below; this may be implemented in different forms. The essence of the description is merely to aid one skilled in the relevant art in comprehensively understanding the specific details of the invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present invention. As used herein, the singular is intended to include the plural unless the context clearly indicates otherwise. Furthermore, it will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
Ordinal numbers such as "first" and "second" cited in the present invention are merely identifiers and do not have any other meaning, such as a particular order or the like. Also, for example, the term "first component" does not itself connote the presence of "second component" and the term "second component" does not itself connote the presence of "first component".
It should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", and the like are used herein for illustrative purposes only and are not limiting.
The invention provides a clay calcination color control method. The method can be applied to the technical field of clay calcination, such as the calcination of clay, so that the calcined material is grey in color. Firstly, the rotary kiln refers to a rotary calcining kiln (commonly called a rotary kiln), the appearance of which is similar to that of a rotary bed, also called a rotary bed kiln, and belongs to the class of building material equipment. Rotary kilns can be classified into cement kilns, metallurgical chemical kilns and lime kilns according to the materials to be treated. The cement kiln is mainly used for calcining cement clinker, and is divided into two main types, namely cement kiln produced by dry method and cement kiln produced by wet method. The metallurgical chemical kiln is mainly used for magnetizing roasting of lean iron ores in iron and steel plants in metallurgical industry; oxidizing and roasting chromium and nickel iron ores; roasting high alumina bauxite ore in a refractory material factory, roasting clinker in an aluminum factory and aluminum hydroxide; roasting chromium ore sand, chromium ore powder and other minerals in chemical plants. Lime kilns (i.e., active lime kilns) are used to calcine active lime and light burned dolomite for iron and steel plants and ferroalloy plants. The rotary kiln 110 in this embodiment is generally referred to as a cement kiln.
Referring to fig. 1, the method comprises the specific steps of:
The method comprises the steps of firstly introducing natural gas fuel into a first fuel inlet for combustion to provide all heat for ignition and kiln starting, stopping introducing natural gas after kiln starting, and then introducing traditional fossil fuel and RDF fuel into a second fuel inlet and a third fuel inlet respectively for combustion to provide calcination heat for the rotary kiln, wherein 50% -90% of heat is provided by the RDF fuel.
When the raw materials to be calcined are dehydrated and decomposed in the rotary kiln, the high-temperature flue gas at the kiln tail is processed by a cooling process to become low-temperature mixed gas with the temperature of 70-80 ℃, and the low-temperature mixed gas is circulated into a cooler.
When the calcined high Wen Chuyao material of the rotary kiln enters the cooler, the high-temperature kiln-discharging material exchanges heat with low-temperature mixed gas which is circulated into the cooler, and is sprayed with water by a water spraying device in the cooler, so that the temperature is quickly reduced to below 300 ℃ to ensure that the high Wen Chuyao material is still gray and avoid color change; in the process, unburnt RDF fuel or burnout dust containing carbon enters a cooler along with Wen Chuyao materials at the feeding point of the kiln head, and reacts with low-temperature mixed gas and water spray to generate Boolean reaction and water gas to generate more reducing gas.
Part of the low-temperature mixed gas after heat exchange and the generated reducing gas enter the kiln head of the rotary kiln, and the other part of the low-temperature mixed gas is sent to a combustion chamber and a main burner which are communicated with the kiln head of the rotary kiln, so that the calcining atmosphere in the rotary kiln is ensured to be a reducing atmosphere.
Among other things, the clay calcination color control method provided by the present invention includes a clay calcination system 100. In a preferred embodiment, as shown in fig. 2, the clay calcination system 100 includes a rotary kiln 110, a flue gas treatment device, and a cooler 130. The rotary kiln 110 is mainly used for calcining cement clinker (clay). The flue gas treatment device is used for treating high-temperature flue gas generated by clay calcination to cool the flue gas, and also comprises, but is not limited to, material recovery, desulfurization and/or dust removal. The cooler 130 is used to cool the high Wen Chuyao material produced by calcination and to provide reducing gas to the rotary kiln 110.
Specifically, referring to fig. 2, in the illustrated embodiment, the kiln tail of the rotary kiln 110 has a raw material inlet 111 and a first flue gas outlet 112. Wherein the raw material inlet 111 is used for introducing raw material to be calcined, for example, the raw material may be fed into the rotary kiln 110 through the raw material inlet 111 by a pipe, a conveyor, or the like. The first flue gas outlet 112 is used for leading out high-temperature flue gas generated during calcination. For example, high temperature flue gas is sent out through a pipeline. The kiln head of the rotary kiln 110 is connected to a combustion chamber 113. The combustion chamber 113 is provided with a main burner 114 for preheating gas entering the rotary kiln 110 by means of combustion and for providing heat required for producing calcined clay and reducing gas. The main burner 114 has a first fuel inlet 115 for introducing natural gas fuel and a first air inlet 116a for introducing air. The combustion chamber 113 has a second air inlet 116b for introducing air, a second fuel inlet 119a for introducing conventional fossil fuel, and a third fuel inlet 119b for introducing RDF fuel. Ambient air is provided to the main burner 114, the combustion chamber 113 through the first air inlet 116a, the second air inlet 116b, respectively, to provide oxygen-bearing combustion.
When the rotary kiln is started, the first fuel inlet 115, the second fuel inlet 119a, the third fuel inlet 119b and the like are arranged, natural gas fuel is introduced into the first fuel inlet to burn to provide all heat for ignition and starting, natural gas is stopped being introduced after starting, and then conventional fossil fuel and RDF fuel are respectively introduced into the second fuel inlet and the third fuel inlet to burn to provide calcination heat for the rotary kiln, wherein 50% -90% of heat (accounting for larger heat) is provided by the RDF fuel. The advantages of such a design are: 1. compared with natural gas, the RDF fuel has lower price, thus greatly reducing the cost; 2. the RDF fuel is used as the main fuel after ignition and kiln starting, so that the use of the traditional fossil fuel is effectively reduced, and the effects of energy conservation and emission reduction are further achieved; 3. after the rotary kiln is ignited and started, RDF fuel is used as a main heat source instead, ash (namely dust containing carbon) after the RDF fuel is combusted enters a kiln blanking point and is mixed with the calcined high Wen Chuyao material, and the RDF fuel can also provide a carbon source for the Boolean reaction in the cooler. In addition, if one fuel inlet fails or fuel cannot be used, other fuel inlets can be used for continuous combustion, so that the aim of multiple protection is fulfilled.
The flue gas treatment device is used for treating the high temperature flue gas conducted out via the first flue gas outlet 112. The high-temperature flue gas guided out of the first flue gas outlet 112 has very low oxygen content, a certain amount of CO and CO 2, and raw materials which are not decomposed and calcined materials can be mixed in. The flue gas treatment device can be used for treating high-temperature flue gas generated by calcining clay, so that the temperature of the flue gas is reduced to become low-temperature flue gas with low temperature, or the flue gas is changed into low-temperature waste gas, for example, the high-temperature flue gas can be treated by material recovery, dust removal and the like, and the treated flue gas does not contain solid impurities and is almost pure gas. The specific structure of the flue gas treatment device will be specifically developed hereinafter.
For convenience of explanation, the embodiment is described in the present example by taking the illustrated embodiment as an example, that is, the high-temperature flue gas generated by calcining clay is changed into low-temperature flue gas (generally about 70-80 degrees celsius) after passing through the flue gas treatment device, but the invention is not limited thereto. The treated low temperature exhaust gas is communicated to the cooler 130 through the circulation pipe 141. At this time, the oxygen content of the low-temperature exhaust gas inherited the high-temperature flue gas is very low, and the low-temperature exhaust gas has the characteristics of a certain amount of CO and CO 2.
The cooler 130 is a long cylindrical structure having an inner cavity. The inlet end of the cooler 130 may have a kiln exit material inlet 131 and a second flue gas outlet 132 (i.e., an exhaust gas outlet). The kiln outlet material inlet 131 is communicated to a discharging point 117 of the kiln head of the rotary kiln 110 through a connecting pipeline 142 and is used for introducing high Wen Chuyao materials (about 600 ℃) calcined by the rotary kiln 110 and dust containing carbon which is not burnt or burnt by RDF fuel. Wherein, CO 2 in the low-temperature waste gas and RDF fuel of high Wen Chuyao materials mixed in a high-temperature state are not burnt or unreacted carbon in the burnt dust containing carbon are subjected to Boolean reaction, so that more reducing gas CO is generated. The second flue gas outlet 132 is respectively connected to the kiln head and the air inlets 116a and 116b of the rotary kiln 110 through pipelines, and is used for guiding out low-temperature waste gas subjected to heat exchange with the high-temperature kiln-discharging material and generated reducing gas, and feeding the low-temperature waste gas subjected to heat exchange and provided with a larger amount of reducing gas CO into the rotary kiln 110, the combustion chamber 113 and the main burner 114 respectively, so that the calcination atmosphere in the rotary kiln 110 is ensured to be a reducing atmosphere. Preferably, in order to further reduce the oxygen content entering the rotary kiln 110, the rotary kiln 110 may be further provided with a secondary burner 118 at a position near the kiln head near the feed point 117. According to the method, high-temperature flue gas generated during calcination of the rotary kiln 110 is processed by the flue gas treatment device and then becomes low-temperature waste gas with low temperature, the low-temperature waste gas enters the cooler 130 and is used as cooling air to exchange heat with high-temperature kiln-discharging materials to reduce the temperature of the high-temperature Wen Chuyao materials for subsequent process use, and on the other hand, CO 2 in the low-temperature waste gas and RDF fuel under a high-temperature state are not burnt or unreacted carbon in burnt dust containing carbon undergo Boolean reaction to generate more reducing gas CO. The low-temperature waste gas after heat exchange has more reducing gas CO, the temperature of the low-temperature waste gas is increased (about 200 ℃), the low-temperature waste gas after heat exchange is divided into two parts, one part enters the rotary kiln 110, the other part goes to the combustion chamber 113 and the main burner 114, and the calcination atmosphere in the rotary kiln 110 is ensured to be the reducing atmosphere, so that the color of the calcined material is ensured to be grey.
In order to provide a smoke treatment apparatus with good use effect, referring to fig. 1, the smoke treatment apparatus may include a cyclone 121, a desulfurizing tower 122, a dust collector 123, and an RTO device 124 (i.e., a regenerative thermal incinerator) connected in order. Wherein the cyclone 121 is used for separating materials from exhaust gas of high temperature flue gas. I.e. the possibly entrained unburned fuel, the undissolved material and the calcined material are separated from the gas. The desulfurizing tower 122 is used for desulfurizing the high-temperature flue gas to remove harmful components. The dust collector 123 is used for removing dust from the high temperature flue gas. I.e. the dust collector 123 again absorbs the material which has not been thoroughly separated. The RTO device 124 is used to eliminate volatile organics in the high temperature flue gas. Among these Volatile Organic Compounds (VOCs) are any carbon compound that, in addition to CO, CO 2、H2CO3, metal carbides, metal carbonates and ammonium carbonate, participates in the photochemical reaction of atmospheric gases. The main components of the VOC are: hydrocarbons, halogenated hydrocarbons, oxygenated hydrocarbons, and nitrogen hydrocarbons, including: benzene series, organic chlorides, freon series, organic ketones, amines, alcohols, ethers, esters, acids, petroleum hydrocarbon compounds, and the like. The high-temperature flue gas is changed into low-temperature waste gas which is almost pure gas after being treated by the flue gas treatment device.
Further, in order to fully utilize the separated or absorbed materials, the materials separated by the cyclone 121 may be introduced into the rotary kiln 110 again through the raw material inlet 111 through the related pipelines for calcination. Similarly, the material obtained after dust removal by the dust collector 123 may also enter the rotary kiln 110 again through the raw material inlet 111 via a pipeline for calcination.
It will be appreciated that although one particular flue gas treatment device is shown in fig. 1, no limitation is intended. The flue gas treatment device may include one or more of a cyclone 121, a desulfurizing tower 122, a dust collector 123, and an RTO device 124, or other devices that achieve the same function in the case of achieving flue gas temperature reduction.
The interior cavity of the cooler 130 may also be connected to a water spray device capable of spray cooling high Wen Chuyao material. Specifically, the water spraying means may include a first water spraying means 151 and a second water spraying means 152. The first water spraying device 151 and the second water spraying device 152 may be spraying devices connected to a water source through a water pipe. The first water spraying device 151 is located at an inlet end of the cooler 130, and is used for rapidly cooling the high Wen Chuyao material entering the cooler 130, so as to avoid discoloration of the calcined material (high-temperature kiln-discharging material). For example, the high temperature kiln exit material is reduced from about 600 ℃ to below 300 ℃ in a preset time. The second water spraying device 152 is located at the outlet end of the cooler 130 and is used for controlling the temperature of the high Wen Chuyao material passing through the outlet end of the cooler 130 to be below a preset threshold.
Specifically, first, water jet equipment cools off high Wen Chuyao material through the mode of spraying water, can further strengthen high Wen Chuyao material cooling effect, makes its cooling down more fast and falls below preset threshold value. More importantly, in addition to being able to cool the high Wen Chuyao material, some of the water becomes water vapor when it comes into contact with the high Wen Chuyao material. The water vapor reacts with unreacted carbon in the high Wen Chuyao material at high temperature to generate reducing gases CO and H 2, and the generated part of reducing gases CO and H 2 enter the rotary kiln 110, the combustion chamber 113 and the main burner 114 together with the low-temperature waste gas after heat exchange, so that the calcination atmosphere in the rotary kiln 110 is further ensured to be reducing atmosphere, and the color of the calcined material is further ensured to be grey.
In this embodiment, the second water spraying device 152 at the outlet end of the cooler 130 controls the temperature of the high Wen Chuyao material passing through the outlet end of the cooler 130 to be below a preset threshold value so as to meet the requirement of the subsequent process. The preset threshold may be 80-150 degrees celsius, for example 80 degrees celsius, 100 degrees celsius, 120 degrees celsius, or the like. In order to achieve temperature regulation, the first water spraying device 151 or the second water spraying device 152 may have a control device or be coupled to an external control device, and may further have a temperature sensor that can monitor the temperature of the high Wen Chuyao material passing through the outlet end of the cooler 130 in real time. The control device adjusts the water spraying flow rate of the first water spraying device 151 or the second water spraying device 152 according to the result of comparing the temperature value monitored by the temperature sensor with the preset threshold value. When the temperature value monitored by the temperature sensor is greater than the preset threshold value, the water spraying flow rate of the first water spraying device 151 or the second water spraying device 152 is increased. And when the temperature value monitored by the temperature sensor is smaller than the preset threshold value, the water spraying of the second water spraying device 152 is reduced. The regulation and control process is a common existing regulation and control technology, does not involve the modification of an internal program, and is based on the function set by the control device. In the present invention, the control device detects the monitoring value of the sensor at a certain sampling frequency (e.g., 2S, 5S, or 10S, etc.), and timely adjusts the operation state of the first water spraying device 151 or the second water spraying device 152.
Referring to fig. 1, the exhaust gas treated by the flue gas treatment device may be communicated to a stack 144 through an exhaust pipe 143 for discharge. In order to facilitate emission control and safe emission, valves and gas concentration monitoring sensors may be provided on the exhaust pipe 143, the circulation pipe 141, and an intermediate pipe of the flue gas treatment device, and when the final exhaust gas reaches the requirement of safe emission, the valves are opened to be discharged into the atmosphere through the chimney 144.
In summary, according to the method of the present invention, the high temperature flue gas generated during calcination in the rotary kiln 110 is treated by the flue gas and then is used for cooling the high Wen Chuyao materials again. And more reducing gas CO is generated by Yu Buduo molar reaction in the cooler 130 and then enters the rotary kiln 110, the combustion chamber 113 and the main burner 114, so that the calcination atmosphere in the rotary kiln 110 is ensured to be a reducing atmosphere, and the color of the calcined material is ensured to be grey. In addition, the water spraying device for spraying water to cool the high-temperature kiln-outlet material further enhances the cooling effect of the high Wen Chuyao material, and meanwhile, reducing gases CO and H 2 can be generated based on the water gas reaction, and then enter the rotary kiln 110, the combustion chamber 113 and the main burner 114, so that the calcination atmosphere in the rotary kiln 110 is further ensured to be a reducing atmosphere. Meanwhile, since the low-temperature exhaust gas has a higher temperature than the normal-temperature air, the fuel consumption in the combustion chamber 113 can be reduced.
In addition, the flue gas generated by calcining the clay in the rotary kiln 110 is treated by the waste gas, and besides being used for cooling the kiln-discharging high-temperature material and providing a large amount of CO for the rotary kiln 110 and the combustion chamber 113, the flue gas also utilizes the characteristics of very low oxygen content (or almost no oxygen) of the waste gas and a certain amount of CO and CO 2, and reacts with carbon in the kiln-discharging high-temperature material in the cooler 130 to generate more reducing gas CO, so that a protective gas is formed to enable the kiln-discharging high-temperature material to be better cooled in an anaerobic manner, and compared with the prior art that the flue gas is discharged into the atmosphere after simple treatment such as filtration, adsorption and the like, or the resource recycling in multiple aspects of the waste gas is realized by a simple heat utilization and recovery mode.
Other embodiments of the invention will be apparent to and understood by those skilled in the art from consideration of the specification and practice of the invention disclosed herein. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
Claims (7)
1. A clay calcination color control method, characterized in that the method comprises the steps of:
Firstly, introducing natural gas fuel into a first fuel inlet for combustion to provide all heat for ignition and kiln starting, stopping introducing natural gas after kiln starting, and then respectively introducing traditional fossil fuel and RDF fuel into a second fuel inlet and a third fuel inlet for combustion to provide calcination heat for the rotary kiln, wherein 50% -90% of heat is provided by the RDF fuel;
When the raw materials to be calcined are dehydrated and decomposed in a rotary kiln, the high-temperature flue gas at the kiln tail is processed by a cooling process and then becomes low-temperature mixed gas with the temperature of 70-80 ℃, and the low-temperature mixed gas is circulated into a cooler;
when the calcined high Wen Chuyao material of the rotary kiln enters the cooler, the high-temperature kiln-discharging material exchanges heat with low-temperature mixed gas which is circulated into the cooler, and is sprayed with water by a water spraying device in the cooler, so that the temperature is quickly reduced to below 300 ℃ to ensure that the high Wen Chuyao material is still gray and avoid color change; in the process, unburnt RDF fuel or burnout dust containing carbon enters a cooler along with a high Wen Chuyao material through a blanking point at the head part of the kiln, and reacts with low-temperature mixed gas and water spray to generate Boolean reaction and water gas reaction to generate more reducing gas;
Part of the low-temperature mixed gas after heat exchange and the generated reducing gas enter the kiln head of the rotary kiln, and the other part of the low-temperature mixed gas is sent to a combustion chamber and a main burner which are communicated with the kiln head of the rotary kiln, so that the calcining atmosphere in the rotary kiln is ensured to be a reducing atmosphere.
2. The method of claim 1, comprising a clay calcination system comprising a rotary kiln, a flue gas treatment device, a cooler, and a water spray device;
the kiln tail of the rotary kiln is provided with a raw material inlet and a first smoke outlet, the raw material inlet is used for introducing raw materials to be calcined, and the first smoke outlet is used for guiding out high-temperature smoke generated during calcination;
The kiln head of the rotary kiln is communicated with a combustion chamber, and the combustion chamber is provided with a main burner, wherein the main burner is provided with a first fuel inlet for introducing natural gas fuel and a first air inlet for introducing air; the combustor having a second fuel inlet for introducing conventional fossil fuel, a third fuel inlet for introducing RDF fuel, and a second air inlet for introducing air;
The flue gas treatment device is used for carrying out cooling treatment on the high-temperature flue gas guided out through the first flue gas outlet, and the low-temperature flue gas formed after treatment is communicated to the cooler through a circulating pipeline; and
The inlet end of the cooler is provided with a kiln outlet material inlet and a second flue gas outlet; the kiln outlet material inlet is communicated to a discharging point of the kiln head of the rotary kiln through a connecting pipeline and is used for introducing unburnt or burnt dust containing carbon of high Wen Chuyao materials and RDF fuel calcined by the rotary kiln; the second flue gas outlet is respectively communicated to the kiln head of the rotary kiln, the first air inlet and the second air inlet through pipelines and is used for guiding out reducing gas generated when the dust containing carbon contacts with low-temperature flue gas and the low-temperature flue gas after heat exchange;
and the water spraying device is arranged in the cooler and is used for spraying water to cool the high-temperature kiln-discharging material.
3. The method of claim 2, wherein the flue gas treatment device comprises at least one of:
The cyclone separator is used for separating materials and waste gas from the high-temperature flue gas;
the desulfurizing tower is used for desulfurizing the high-temperature flue gas;
the dust collector is used for removing dust from the high-temperature flue gas;
And the RTO device is used for eliminating volatile organic compounds in the high-temperature flue gas.
4. A method according to claim 3, wherein the flue gas treatment device comprises the cyclone, the desulfurizing tower, the dust collector and the RTO device connected in sequence by a pipe:
The materials separated by the cyclone separator enter the rotary kiln again through a pipeline communicated with the raw material inlet; and/or
And the material obtained after dust removal by the dust collector also enters the rotary kiln again through a pipeline communicated with the raw material inlet.
5. The method of claim 4, wherein the water spraying device comprises:
The first water spraying device is positioned at the inlet end of the cooler and is used for rapidly cooling the high-temperature kiln-discharging material;
the second water spraying device is positioned at the outlet end of the cooler and used for controlling the temperature of the high-temperature kiln-discharging material passing through the outlet end of the cooler to be lower than a preset threshold value in a linkage mode with the first water spraying device.
6. The method according to any one of claims 2 to 5, wherein the flue gas treated by the flue gas treatment device is also communicated to a stack via an exhaust duct.
7. The method of claim 1, wherein the kiln head of the rotary kiln is further provided with an auxiliary burner near the feed point for further consuming oxygen entering the rotary kiln.
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| CN116323512A (en) * | 2020-10-05 | 2023-06-23 | Khd洪保德韦达克有限公司 | Multi-stage clay calcination process for controlling product color |
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