CN114854434B - Waste gas cooling and whitening system for wet quenching - Google Patents
Waste gas cooling and whitening system for wet quenching Download PDFInfo
- Publication number
- CN114854434B CN114854434B CN202210466580.8A CN202210466580A CN114854434B CN 114854434 B CN114854434 B CN 114854434B CN 202210466580 A CN202210466580 A CN 202210466580A CN 114854434 B CN114854434 B CN 114854434B
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- stage condenser
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- pipeline
- air
- air duct
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- 238000010791 quenching Methods 0.000 title claims abstract description 60
- 230000000171 quenching effect Effects 0.000 title claims abstract description 59
- 230000002087 whitening effect Effects 0.000 title claims abstract description 15
- 238000001816 cooling Methods 0.000 title claims abstract description 14
- 239000002912 waste gas Substances 0.000 title claims description 31
- 239000000571 coke Substances 0.000 claims abstract description 41
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000000498 cooling water Substances 0.000 claims abstract description 15
- 238000001914 filtration Methods 0.000 claims abstract description 6
- 239000007789 gas Substances 0.000 claims description 18
- 239000002826 coolant Substances 0.000 claims description 15
- 238000005507 spraying Methods 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000005192 partition Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 239000000428 dust Substances 0.000 description 5
- 239000002245 particle Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000009833 condensation Methods 0.000 description 3
- 230000005494 condensation Effects 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- 239000000779 smoke Substances 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- FMMWHPNWAFZXNH-UHFFFAOYSA-N Benz[a]pyrene Chemical compound C1=C2C3=CC=CC=C3C=C(C=C3)C2=C2C3=CC=CC2=C1 FMMWHPNWAFZXNH-UHFFFAOYSA-N 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B39/00—Cooling or quenching coke
- C10B39/04—Wet quenching
- C10B39/08—Coke-quenching towers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
- B01D53/265—Drying gases or vapours by refrigeration (condensation)
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B43/00—Preventing or removing incrustations
- C10B43/02—Removing incrustations
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
Abstract
The invention provides an exhaust gas cooling and whitening system for wet quenching, which comprises a quenching tower main body, a sprayer and a filtering screen; the air conditioner also comprises an air blower, a two-stage condenser, a water inlet pump, a pipeline and an air duct; the two-stage condenser is fixed at the top end of the coke quenching tower main body and covers the top opening of the coke quenching tower main body; the air blower is arranged at one side of the two-stage condenser and used for conveying air into the two-stage condenser; the water inlet pump is arranged at one side of the two-stage condenser and is used for conveying circulating cooling water into the two-stage condenser; the air duct is fixed at the top end of the two-stage condenser and is communicated with the two-stage condenser, an opening is formed in the side wall of the air duct, and a pipeline bent upwards is fixedly connected to the opening towards the inner side of the air duct; the pipeline is arranged on the other side of the two-stage condenser opposite to the fan, the inlet end of the pipeline is communicated with the two-stage condenser, and the outlet end of the pipeline is communicated with the pipeline through an opening on the side wall of the air duct.
Description
Technical Field
The invention relates to the technical field of wet quenching, in particular to an exhaust gas cooling and whitening system for wet quenching.
Background
The coke quenching is one of important processes for producing coke in the coking industry, wherein the dry quenching has the advantages of energy saving, environmental protection, coke quality improvement and the like compared with the traditional wet quenching, but due to the complex implementation process and high construction and operation cost, enterprises applying the dry quenching often can also be provided with a wet quenching device as a standby device during overhauling and failure. Therefore, the process is simple, and the production capacity of the traditional wet quenching technology with low investment cost is still more than 50% in China. Wet quenching is carried out by spraying water directly onto coke at 1000 deg.C to quench and rapidly cool, and the coke releases a large amount of heat to rapidly gasify water, and under buoyancy, water vapor is wrapped with air, dust particles and SO 2 The pollutants such as benzopyrene, volatile phenol and the like flow to the coke quenching towerAnd (3) a roof. The trapping device arranged on the top of the coke quenching tower can basically remove dust particles and liquid drops, but water-soluble pollutants cannot be removed, and moisture is separated out after wet saturated steam at the outlet of the coke quenching tower is cooled at the ambient temperature, so that white smoke plume is formed in the atmosphere, the environment-friendly requirement is not met, and the waste of water resources is also caused. Thus, there is an urgent need for an exhaust gas cooling and whitening system for wet quenching.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides an exhaust gas cooling and whitening system for wet quenching.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
an exhaust gas cooling and whitening system for wet quenching comprises a quenching tower main body, a sprayer and a filtering screen; the top of the coke quenching tower main body is provided with an opening, the sprayer is fixed at the lower side in the quenching Jiao Dazhu body, and the filter screen is fixed at the upper side in the coke quenching tower main body;
the air conditioner also comprises an air blower, a two-stage condenser, a water inlet pump, a pipeline and an air duct; the two-stage condenser is fixed at the top end of the coke quenching tower main body and covers the top opening of the coke quenching tower main body; the air blower is arranged at one side of the two-stage condenser and used for conveying air into the two-stage condenser; the water inlet pump is arranged at one side of the two-stage condenser and is used for conveying circulating cooling water into the two-stage condenser; the air duct is fixed at the top end of the two-stage condenser and is communicated with the two-stage condenser, an opening is formed in the side wall of the air duct, and a pipeline bent upwards is fixedly connected to the opening towards the inner side of the air duct; the pipeline is arranged on the other side of the two-stage condenser opposite to the fan, the inlet end of the pipeline is communicated with the two-stage condenser, and the outlet end of the pipeline is communicated with the pipeline through an opening on the side wall of the air duct.
In order to optimize the technical scheme, the specific measures adopted further comprise:
further, the two-stage condenser consists of a plurality of condenser units, wherein each condenser unit comprises a vertical waste gas channel and a horizontal cooling medium channel which are arranged at intervals in a layering manner, and further comprises seals and a partition plate; the waste gas channel and the cooling medium channel are layered by the partition plates, and sealing strips are fixed at the left end and the right end of the waste gas channel and the upper end and the lower end of the cooling medium channel; the cooling medium channel comprises an air channel and a cooling water channel, and the baffle is arranged in the middle of the cooling medium channel and separates the air channel from the cooling water channel; the inlet end of the pipeline is communicated with the air channel; the air duct is communicated with the waste gas channel.
Further, staggered fins are arranged in the waste gas channel, the air channel and the cooling water channel.
Further, the top of the air duct is provided with a silk screen for further removing residual liquid drops, and the discharged waste gas can avoid generating white smoke plumes.
Further, a spraying device is arranged in the air duct and used for cleaning the waste gas channel.
Further, the pipeline surface is wrapped with the heating heat preservation layer, and for winter in cold areas or other areas in the north, the pipeline can be intermittently heated by the heating heat preservation layer, so that the temperature of air in the pipeline is maintained at a higher level, and the whitening effect is guaranteed.
The beneficial effects of the invention are as follows: the invention provides an exhaust gas cooling and whitening system for wet quenching by arranging a blower, a two-stage condenser, a water inlet pump, a pipeline, an air duct and other parts; the air blower conveys air into the air duct through the air channel, the air enters the air duct through the pipeline and is continuously discharged upwards, the waste gas enters the waste gas channel and is sequentially subjected to heat exchange with the air and the condensed water, and under the drainage effect of the air discharged by the air duct, the waste gas enters the air duct and is mixed with the hot air subjected to heat exchange, so that white smoke plume is eliminated, and the aim of environmental protection is fulfilled; in the process, condensed water generated after the waste gas is condensed and dehumidified falls under the action of gravity to supplement spray water used for wet quenching, so that the aim of saving water resources is fulfilled; the heat source adopted by the reheating of the waste gas after the condensation treatment is derived from the heat released by the condensation of the waste gas, thereby achieving the purpose of saving energy consumption.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic diagram of a two-stage condenser;
FIG. 3 is a graph showing the change of humidity state during the treatment of coke quenching exhaust gas according to the present invention;
wherein 1 is the air blower, 2 is the two-stage condenser, 201 is the exhaust passage, 202 is the air passage, 203 is the cooling water passage, 204 is the baffle, 205 is the strip of paper used for sealing, 206 is the baffle, 3 is the water inlet pump, 4 is the pipeline, 5 is the wind channel, 501 is the pipeline, 502 is spray set, 6 is the silk screen, 7 is the coke quenching tower main part, 8 is the spray thrower, 9 is the filter screen.
Detailed Description
The invention will now be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, an exhaust gas cooling and whitening system for wet quenching comprises a quenching tower main body 7, a sprayer 8 and a filtering screen 9; the top of the coke quenching tower main body 7 is opened, the sprayer 8 is fixed at the lower side of the inner part of the coke quenching tower main body 7, and the filter screen 9 is fixed at the upper side of the inner part of the coke quenching tower main body 7;
the air conditioner also comprises an air blower 1, a two-stage condenser 2, a water inlet pump 3, a pipeline 4 and an air duct 5; as shown in fig. 2, the two-stage condenser 2 is fixed at the top end of the coke quenching tower main body 7 and covers the top opening of the coke quenching tower main body 7, and the two-stage condenser 2 is composed of a plurality of condenser units, and each condenser unit comprises a vertical waste gas channel 201 and a horizontal cooling medium channel which are arranged at intervals in a layered manner, and further comprises a seal 205 and a baffle 206; the exhaust gas channel 201 and the cooling medium channel are layered by a baffle plate 206, and seals 205 are fixed at the left and right ends of the exhaust gas channel 201 and the upper and lower ends of the cooling medium channel; the cooling medium channel comprises an air channel 202, a cooling water channel 203 and a baffle 204, wherein the baffle 204 is horizontally arranged in the middle of the cooling medium channel and separates the air channel 202 from the cooling water channel 203; staggered fins are arranged in the waste gas channel 201, the air channel 202 and the cooling water channel 203; the air blower 1 is arranged at one side of the two-stage condenser 2 and is used for conveying air into the two-stage condenser 2; the water inlet pump 3 is arranged at one side of the two-stage condenser 2 and is used for conveying circulating cooling water into the two-stage condenser 2; the air duct 5 is fixed at the top end of the two-stage condenser 2 and is communicated with the two-stage condenser 2, an opening is formed in the side wall of the air duct 5, a pipeline 501 bent upwards is fixedly connected to the opening towards the inner side of the air duct 5, a silk screen 6 is arranged at the top of the air duct 5, and a spraying device 502 is arranged in the air duct 5; the pipeline 4 is arranged on the other side of the two-stage condenser 2 opposite to the fan 1, the inlet end of the pipeline 4 is communicated with the air channel 202, the outlet end of the pipeline 4 is communicated with the pipeline 501 through an opening on the side wall of the air duct 5, and the surface of the pipeline 4 is wrapped with a heating and heat-insulating layer
The working principle of the invention is as follows: the coke quenching car conveys the hot coke at about 1000 ℃ to the bottom of the coke quenching tower main body 7, the blower 1, the water inlet pump 3 and the spraying device 8 are started, and spraying water is uniformly sprayed on the hot coke, so that the coke quenching process is formally started. The moisture is gasified rapidly after contacting the coke surface, and the generated vapor is wrapped with a large amount of air, dust particles and pollutants generated by coke combustion under the action of buoyancy to form coke quenching waste gas, and flows towards the top of the coke quenching tower main body 7. After the waste gas passes through the tower top filtering screen 9, most dust particles can be removed by filtering, and the waste gas after dust removal enters the waste gas channel 201 of the two-stage condenser 2; under the action of the blower 1, air flowing at a high speed is blown out of the air duct, after flowing through the air channel 202, the air enters the pipeline 501 in the air duct 5 through the pipeline 4 and is sprayed upwards, and by virtue of the drainage effect generated by the air, the flow resistance of the waste gas can be overcome, and the waste gas smoothly passes through the waste gas channel 201 of the two-stage condenser 2. In this process, the exhaust gas exchanges heat with the air in the air channel 202 and the condensed water in the cooling water channel 203 in sequence, and the exhaust gas is cooled and dehumidified into a low-temperature wet saturated state after condensation and heat exchange and flows out into the air flue 5. The air sent into the two-stage condenser 2 by the blower 1 is heated by the waste gas, then is conveyed into the air duct 5, and is mixed with the low-temperature wet saturated waste gas from the two-stage condenser 2, so that the temperature of the waste gas is increased, the moisture content and the relative humidity are reduced, and the residual liquid drops are removed through the silk screen 6 at the top of the air duct 5 and then are discharged to the outside. As shown in fig. 3, about 90s after the coke quenching process starts, the coke temperature is reduced to about 250 ℃, the coke quenching process is finished, the sprayer 8 stops spraying water to the coke, the blower 1 and the water inlet pump 3 stop working, at this time, the spraying device 502 is turned on, and clean water is sprayed into the exhaust gas channel 201 in the two-stage condenser 2. After the flushing is finished, the spraying device 502 is closed, residual moisture at the bottom of the coke quenching tower is recovered, and the coke quenching tower is used for quenching spraying again after treatment.
It should be noted that the terms like "upper", "lower", "left", "right", "front", "rear", and the like are also used for descriptive purposes only and are not intended to limit the scope of the invention in which the invention may be practiced, but rather the relative relationship of the terms may be altered or modified without materially altering the teachings of the invention.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above examples, and all technical solutions belonging to the concept of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to the invention without departing from the principles thereof are intended to be within the scope of the invention as set forth in the following claims.
Claims (5)
1. An exhaust gas cooling and whitening system for wet quenching comprises a quenching tower main body (7), a sprayer (8) and a filtering screen (9); the top of the coke quenching tower main body (7) is opened, the sprayer (8) is fixed at the lower side in the coke quenching tower main body (7), and the filter screen (9) is fixed at the upper side in the coke quenching tower main body (7);
the air conditioner is characterized by further comprising an air blower (1), a two-stage condenser (2), a water inlet pump (3), a pipeline (4) and an air duct (5); the two-stage condenser (2) is fixed at the top end of the coke quenching tower main body (7) and covers the top opening of the coke quenching tower main body (7); the air blower (1) is arranged at one side of the two-stage condenser (2) and is used for conveying air into the two-stage condenser (2); the water inlet pump (3) is arranged at one side of the two-stage condenser (2) and is used for conveying circulating cooling water into the two-stage condenser (2); the air duct (5) is fixed at the top end of the two-stage condenser (2), is communicated with the two-stage condenser (2), an opening is formed in the side wall of the air duct (5), and a pipeline (501) bent upwards is fixedly connected to the opening towards the inner side of the air duct (5); the pipeline (4) is arranged on the other side of the two-stage condenser (2) opposite to the blower (1), the inlet end of the pipeline (4) is communicated with the two-stage condenser (2), and the outlet end of the pipeline (4) is communicated with the pipeline (501) through an opening on the side wall of the air duct (5);
the two-stage condenser (2) consists of a plurality of condenser units, wherein each condenser unit comprises a vertical waste gas channel (201) and a horizontal cooling medium channel which are arranged at intervals in a layering manner, and further comprises a seal (205) and a baffle plate (206); the waste gas channel (201) and the cooling medium channel are layered through the partition plates (206), and seals (205) are fixed at the left end and the right end of the waste gas channel (201) and the upper end and the lower end of the cooling medium channel; the cooling medium channel comprises an air channel (202), a cooling water channel (203) and a baffle plate (204), wherein the baffle plate (204) is arranged in the middle of the cooling medium channel and separates the air channel (202) and the cooling water channel (203); the inlet end of the pipeline (4) is communicated with the air channel (202); the air duct (5) is communicated with the waste gas channel (201).
2. An exhaust gas cooling and whitening system for wet quenching as claimed in claim 1, wherein staggered fins are arranged in the exhaust gas channel (201), the air channel (202) and the cooling water channel (203).
3. An exhaust gas cooling and whitening system for wet quenching as claimed in claim 1, characterized in that the top of the air duct (5) is provided with a wire mesh (6).
4. An exhaust gas cooling and whitening system for wet quenching as claimed in claim 1, wherein a spraying device (502) is arranged in the air duct (5).
5. An exhaust gas cooling and whitening system for wet quenching as claimed in claim 1, wherein the surface of the pipeline (4) is wrapped with a heating and insulating layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210466580.8A CN114854434B (en) | 2022-04-29 | 2022-04-29 | Waste gas cooling and whitening system for wet quenching |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210466580.8A CN114854434B (en) | 2022-04-29 | 2022-04-29 | Waste gas cooling and whitening system for wet quenching |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114854434A CN114854434A (en) | 2022-08-05 |
| CN114854434B true CN114854434B (en) | 2024-01-26 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210466580.8A Active CN114854434B (en) | 2022-04-29 | 2022-04-29 | Waste gas cooling and whitening system for wet quenching |
Country Status (1)
| Country | Link |
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| CN (1) | CN114854434B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4289585A (en) * | 1979-04-14 | 1981-09-15 | Didier Engineering Gmbh | Method and apparatus for the wet quenching of coke |
| WO2014191079A1 (en) * | 2013-05-27 | 2014-12-04 | Thyssenkrupp Industrial Solutions Ag | Method and device for reducing leaks on inlets and outlets of a wet quenching tower |
| CN204752617U (en) * | 2015-06-08 | 2015-11-11 | 邢台旭阳煤化工有限公司 | Wet quenching system |
| CN110257086A (en) * | 2019-07-25 | 2019-09-20 | 沈阳东大山汇环境科技有限公司 | A kind of coke wet quenching device and method of emission-free discharge |
| CN210012811U (en) * | 2018-12-05 | 2020-02-04 | 杨玉亭 | Intelligent fully-closed wet quenching and comprehensive recycling equipment |
| CN110935279A (en) * | 2019-12-19 | 2020-03-31 | 济宁明升新材料有限公司 | Heat pump type white smoke eliminating device and method thereof |
| CN211255813U (en) * | 2019-11-07 | 2020-08-14 | 浙江鼎诚环保科技有限公司 | Energy-concerving and environment-protective type wet quenching tower |
-
2022
- 2022-04-29 CN CN202210466580.8A patent/CN114854434B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4289585A (en) * | 1979-04-14 | 1981-09-15 | Didier Engineering Gmbh | Method and apparatus for the wet quenching of coke |
| WO2014191079A1 (en) * | 2013-05-27 | 2014-12-04 | Thyssenkrupp Industrial Solutions Ag | Method and device for reducing leaks on inlets and outlets of a wet quenching tower |
| CN204752617U (en) * | 2015-06-08 | 2015-11-11 | 邢台旭阳煤化工有限公司 | Wet quenching system |
| CN210012811U (en) * | 2018-12-05 | 2020-02-04 | 杨玉亭 | Intelligent fully-closed wet quenching and comprehensive recycling equipment |
| CN110257086A (en) * | 2019-07-25 | 2019-09-20 | 沈阳东大山汇环境科技有限公司 | A kind of coke wet quenching device and method of emission-free discharge |
| CN211255813U (en) * | 2019-11-07 | 2020-08-14 | 浙江鼎诚环保科技有限公司 | Energy-concerving and environment-protective type wet quenching tower |
| CN110935279A (en) * | 2019-12-19 | 2020-03-31 | 济宁明升新材料有限公司 | Heat pump type white smoke eliminating device and method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114854434A (en) | 2022-08-05 |
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