CN113828094A - Semi-dry desulfurization and denitrification system - Google Patents
Semi-dry desulfurization and denitrification system Download PDFInfo
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- CN113828094A CN113828094A CN202111197563.0A CN202111197563A CN113828094A CN 113828094 A CN113828094 A CN 113828094A CN 202111197563 A CN202111197563 A CN 202111197563A CN 113828094 A CN113828094 A CN 113828094A
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- flue gas
- fluidized bed
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- desulfurization tower
- bed desulfurization
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- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 88
- 230000023556 desulfurization Effects 0.000 title claims abstract description 88
- 239000003546 flue gas Substances 0.000 claims abstract description 100
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 99
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000000428 dust Substances 0.000 claims description 23
- 239000007789 gas Substances 0.000 claims description 7
- 239000002245 particle Substances 0.000 abstract description 9
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 10
- 230000003009 desulfurizing effect Effects 0.000 description 6
- 238000005245 sintering Methods 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000011282 treatment Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000010485 coping Effects 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- BIGPRXCJEDHCLP-UHFFFAOYSA-N ammonium bisulfate Chemical compound [NH4+].OS([O-])(=O)=O BIGPRXCJEDHCLP-UHFFFAOYSA-N 0.000 description 1
- 229910052925 anhydrite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 1
- 235000010261 calcium sulphite Nutrition 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012717 electrostatic precipitator Substances 0.000 description 1
- 238000011221 initial treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 231100000989 no adverse effect Toxicity 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000012716 precipitator Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
-
- 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
-
- 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/80—Semi-solid phase processes, i.e. by using slurries
-
- 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
-
- 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/96—Regeneration, reactivation or recycling of reactants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a semidry desulfurization and denitrification system which comprises a circulating fluidized bed desulfurization tower, wherein the circulating fluidized bed desulfurization tower comprises a Venturi-shaped pipe section, a flue gas inlet is formed in the lower end of the circulating fluidized bed desulfurization tower pipe section, the upper end of the circulating fluidized bed desulfurization tower pipe section is also connected with a water tank and a desulfurizer bin, a flue gas outlet is formed in the upper end of the circulating fluidized bed desulfurization tower, a bypass flue gas inlet pipe is arranged above the pipe section of the circulating fluidized bed desulfurization tower, and flue gas in the bypass flue gas inlet pipe enters the circulating fluidized bed desulfurization tower and flows horizontally. The invention is provided with the bypass pipeline which is transversely arranged, and the axial flow flue gas accelerated by the pipeline is subjected to radial mixed flow, so that the turbulence of the flue gas is enhanced, the effective collision between the flue gas and particles is enhanced, and the reaction surface of desulfurizer particles is continuously updated, thereby improving the desulfurization performance.
Description
Technical Field
The invention relates to the technical field of combustion flue gas treatment, in particular to a semi-dry desulfurization and denitrification system.
Background
In the exhaust emission of steel enterprises, the discharged sintering exhaust gas occupies a great proportion. At present, three process routes aiming at the treatment of the waste gas of a sintering machine in the steel industry are provided, namely a first circulating fluidized bed desulfurization (semi-dry desulfurization) and a medium-low temperature SCR denitration process; secondly, an active coke desulfurization and denitrification integrated technology; and thirdly, wet desulphurization and SCR combined denitration process. The circulating fluidized bed desulfurization (semi-dry desulfurization) + medium and low temperature SCR denitration process becomes the most mainstream waste gas treatment process in the steel industry at present by virtue of the advantages of simple process, no wastewater, no adverse effect of desulfurization products on denitration, low manufacturing cost and the like.
In the semidry desulfurization process of the circulating fluidized bed, flue gas discharged by a sintering machine usually enters from the bottom of an absorption tower (namely the circulating fluidized bed) with a venturi device, at the moment, because the venturi structure can accelerate the speed of the flue gas, after the flue gas is mixed with fine absorbent powder, severe friction can occur among particles, gas and the particles, water mist is uniformly sprayed in the flue gas, the temperature of the flue gas is reduced, and desulfurization products CaSO3 and CaSO4 can be generated through reaction. And the desulfurized flue gas can carry a large amount of solid particles, and the flue gas is discharged from the top of the absorption tower and then is dedusted by a deduster. Wherein, the flue gas can only carry out axial acceleration to the flue gas through venturi alone, and radial direction's flue gas does not have the mixing disturbance, has the incomplete problem of desulfurization efficiency.
Disclosure of Invention
The invention aims to provide a semidry desulfurization and denitrification system with high desulfurization efficiency aiming at the defects in the background technology.
In order to achieve the purpose, the invention provides a semi-dry desulfurization and denitrification system, which adopts the following technical scheme:
the semi-dry desulfurization and denitrification system comprises a circulating fluidized bed desulfurization tower, wherein the circulating fluidized bed desulfurization tower comprises a Venturi-shaped pipe section, a flue gas inlet is formed in the lower end of the circulating fluidized bed desulfurization tower pipe section, the upper end of the circulating fluidized bed desulfurization tower pipe section is also connected with a water tank and a desulfurizer bin, a flue gas outlet is formed in the upper end of the circulating fluidized bed desulfurization tower, a bypass flue gas inlet pipe is arranged above the pipe section of the circulating fluidized bed desulfurization tower, and flue gas in the bypass flue gas inlet pipe enters the circulating fluidized bed desulfurization tower and flows horizontally.
The semi-dry desulfurization and denitrification system is further improved in that a flue gas outlet at the upper end of a circulating fluidized bed desulfurization tower is connected with a bag-type dust remover, the side end of the bag-type dust remover is connected with a GGH, the GGH is connected with an SCR denitrification reactor, a gas outlet of the SCR denitrification reactor is connected with the GGH, and the SCR denitrification reactor is also connected with a bypass flue gas inlet pipe.
The semi-dry desulfurization and denitrification system is further improved in that a plurality of bypass flue gas inlet pipes are arranged, and the lengths of the plurality of bypass flue gas inlet pipes extending into the circulating fluidized bed desulfurization tower are different.
The semi-dry desulfurization and denitrification system is further improved in that a flue gas inlet of the circulating fluidized bed desulfurization tower is also connected with a bypass flue gas inlet pipe.
The semi-dry desulfurization and denitrification system is further improved in that the bag-type dust remover is also connected with the SCR denitrification reactor through a heat blower.
The semi-dry desulfurization and denitrification system is further improved in that a dust outlet is formed in the lower end of the bag-type dust remover and is also connected to a pipe section of a circulating fluidized bed desulfurization tower.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention is provided with the bypass pipeline which is transversely arranged, and the axial flow flue gas accelerated by the pipeline is subjected to radial mixed flow, so that the turbulence of the flue gas is enhanced, the effective collision between the flue gas and particles is enhanced, and the reaction surface of desulfurizer particles is continuously updated, thereby improving the desulfurization performance.
2. The bypass flue gas forming radial flow can adjust the amount and temperature of the flue gas, and the bypass flue gas can be taken from the flue gas at a desulfurization inlet and can also be taken from the flue gas in a denitration process (the high-temperature flue gas at a denitration outlet can form low-temperature flue gas through the heat exchange of GGH, and the flue gas with two different temperatures can be taken as the bypass flue gas). The flue gas of denitration process can be used for coping with the fluctuation of the flue gas volume that gets into the desulfurizing tower and the fluctuation of temperature, guarantees the steady operation of desulfurizing tower.
Drawings
FIG. 1 is a schematic structural view of the present invention;
in the figure: 1 electric dust collector, 2 circulating fluidized bed desulfurizing tower, 21 pipe sections, 3 water tanks, 4 desulfurizing agent bins, 5 bypass flue gas inlet pipes, 6 bag dust collectors, 7GGH, 8SCR denitration reactors, 9 air heaters and 10 dust outlets.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, a semi-dry desulfurization and denitrification system, including circulating fluidized bed desulfurization tower 2, circulating fluidized bed desulfurization tower is including being venturi shape's pipeline section 21, and the flue gas import sets up in circulating fluidized bed desulfurization tower pipeline section 21's lower extreme, and the sintering flue gas gets into the flue gas import through electrostatic precipitator 1 again earlier, circulating fluidized bed desulfurization tower pipeline section 21's upper end still is connected with water tank 3, desulfurizer storehouse 4, and is concrete, is provided with the atomizing of connecting the water tank in the circulating fluidized bed desulfurization tower and sprays the structure, and the atomizing sprays the structure and evenly lays in circulating fluidized bed desulfurization tower. The upper end of the circulating fluidized bed desulfurization tower 2 is provided with a flue gas outlet, a bypass flue gas inlet pipe 5 is arranged above a pipe section of the circulating fluidized bed desulfurization tower, and flue gas in the bypass flue gas inlet pipe enters the circulating fluidized bed desulfurization tower to flow horizontally. Flue gas entering the circulating fluidized bed desulfurization tower from a flue gas inlet is accelerated through a venturi-shaped pipe section to realize axial accelerated flow, the flue gas horizontally and radially enters the tower from a bypass flue gas inlet pipe is mixed, two flue gases are intersected in the tower to form axial flow, the turbulence of the flue gas is further enhanced, the contact between the flue gas and a desulfurizer is enhanced, and the desulfurization efficiency and the utilization rate of the desulfurizer are improved.
Further, a flue gas outlet at the upper end of the circulating fluidized bed desulfurization tower 5 is connected to a bag-type dust collector 6, the side end of the bag-type dust collector 6 is connected to a GGH7, the GGH7 is connected to an SCR denitration reactor 8, a gas outlet of the SCR denitration reactor 8 is connected to a GGH7, and the SCR denitration reactor 8 is further connected to a bypass flue gas inlet pipe 5. The bypass flue gas can use high-temperature flue gas and low-temperature flue gas from a denitration outlet positioned at a GGH (gas-gas heater) inlet and outlet, and the influence of flue gas fluctuation of a sintering machine on the performance of a desulfurizing tower can be well dealt with by introducing the flue gas of a subsequent section. Meanwhile, high-temperature (or low-temperature) flue gas can be introduced, and the method can also be used as a means for coping with the temperature fluctuation of the flue gas.
Furthermore, a plurality of bypass flue gas inlet pipes are arranged, and the lengths of the plurality of bypass flue gas inlet pipes extending into the circulating fluidized bed desulfurization tower are different. A plurality of bypass flue gas advances the pipe and can be spiral rising and lay, further realizes the turbulent motion that the flue gas mixes, guarantees desulfurization efficiency.
Furthermore, the flue gas inlet of the circulating fluidized bed desulfurization tower is also connected with a bypass flue gas inlet pipe.
Further, the bag-type dust collector 6 is also connected to the SCR denitration reactor 8 through a heat blower 9. The SCR denitration reactor can be inside evenly to be provided with a plurality of branch storehouses, and the flue gas through the air heater can get into one of them branch storehouse, heats and decomposes ammonium bisulfate wherein, mixes through the denitration export simultaneously, through the GGH heat transfer, improves the holistic temperature of SCR.
Further, the lower end of the bag-type dust collector is provided with a dust outlet 10, and the dust outlet is also connected with a pipe section of a circulating fluidized bed desulfurization tower. Specifically, a reflux plate can be arranged at the top of the desulfurization tower, the flue gas is mixed with particles to move upwards in the desulfurization tower, and meanwhile, a part of particles flow downwards from the top of the tower, so that the contact time of the desulfurizer and the flue gas is prolonged, and the desulfurization efficiency is enhanced.
The working principle of the invention is as follows: sintering flue gas enters a circulating fluidized bed desulfurization tower after primary treatment of an electric precipitator, the flue gas enters the circulating fluidized bed desulfurization tower from a flue gas inlet to perform axial flow of the flue gas, partial flue gas is shunted to enter a bypass flue gas inlet pipe and then flows radially, mixed flow of two paths of flue gas is further realized, desulfurization efficiency is enhanced, the flue gas discharged from the upper end of the circulating fluidized bed desulfurization tower is treated by a bag-type dust remover, the generated dust part enters the desulfurization tower, internal circulation of ash is further ensured, desulfurization effect is ensured, the flue gas treated by the bag-type dust remover is heated by GGH and reaches an SCR denitration reactor to perform denitration reaction, the denitrated flue gas can flow back to the bypass flue gas inlet pipe to perform mixed flow with the axially flowing flue gas, desulfurization efficiency is enhanced, and at the moment, the high temperature or the low temperature of the flue gas can be controlled to deal with the fluctuation of the amount of the flue gas entering the desulfurization tower and the fluctuation of the temperature, and the stable operation of the desulfurizing tower is ensured.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (6)
1. The utility model provides a semi-dry desulfurization denitration system which characterized in that: including circulating fluidized bed desulfurization tower, circulating fluidized bed desulfurization tower is including being the pipeline section of venturi shape, and the flue gas inlet sets up in the lower extreme of circulating fluidized bed desulfurization tower pipeline section, the upper end of circulating fluidized bed desulfurization tower pipeline section still is connected with water tank, desulfurizer storehouse, circulating fluidized bed desulfurization tower upper end is provided with the exhanst gas outlet, the pipeline section top of circulating fluidized bed desulfurization tower is provided with the bypass flue gas and advances the pipe, the bypass flue gas advances intraductal flue gas entering circulating fluidized bed desulfurization tower and is the horizontal flow.
2. The semi-dry desulfurization and denitrification system according to claim 1, wherein: the flue gas outlet of the upper end of the circulating fluidized bed desulfurization tower is connected with a bag-type dust collector, the side end of the bag-type dust collector is connected with a GGH, the GGH is connected with an SCR denitration reactor, the gas outlet of the SCR denitration reactor is connected with the GGH, and the SCR denitration reactor is also connected with a bypass flue gas inlet pipe.
3. The semi-dry desulfurization and denitrification system according to claim 2, wherein: the bypass flue gas inlet pipe is provided with a plurality of inlet pipes, and the lengths of the inlet pipes extending into the circulating fluidized bed desulfurization tower are different.
4. The semi-dry desulfurization and denitrification system according to claim 2, wherein: and the flue gas inlet of the circulating fluidized bed desulfurization tower is also connected with a bypass flue gas inlet pipe.
5. The semi-dry desulfurization and denitrification system according to claim 2, wherein: the bag-type dust collector is also connected to the SCR denitration reactor through an air heater.
6. The semi-dry desulfurization and denitrification system according to claim 2, wherein: the lower end of the bag-type dust collector is provided with a dust outlet, and the dust outlet is also connected with a pipe section of the circulating fluidized bed desulfurization tower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111197563.0A CN113828094A (en) | 2021-10-14 | 2021-10-14 | Semi-dry desulfurization and denitrification system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111197563.0A CN113828094A (en) | 2021-10-14 | 2021-10-14 | Semi-dry desulfurization and denitrification system |
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| Publication Number | Publication Date |
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| CN113828094A true CN113828094A (en) | 2021-12-24 |
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| CN202111197563.0A Pending CN113828094A (en) | 2021-10-14 | 2021-10-14 | Semi-dry desulfurization and denitrification system |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201404765Y (en) * | 2009-05-13 | 2010-02-17 | 黄震 | Low-resistance type circulating fluidized bed flue gas desulfurization |
| CN103551004A (en) * | 2013-10-27 | 2014-02-05 | 黑龙江宏宇电站设备有限公司 | Desulfurization method of dry desulfurization system of coal gangue circulating fluidized bed |
| CN203437036U (en) * | 2013-09-12 | 2014-02-19 | 河北环科力创环境工程有限公司 | Sintering fume desulfurization and denitrification device |
| CN103644564A (en) * | 2013-11-26 | 2014-03-19 | 中国华能集团清洁能源技术研究院有限公司 | Temperature-adjustable and resistance-adjustable fluidized wind system of circulating fluidized bed boiler |
| CN208727151U (en) * | 2018-08-16 | 2019-04-12 | 北京晨晰环保工程有限公司 | A kind of new Type Coke Oven flue gas desulfurization and denitrification system |
-
2021
- 2021-10-14 CN CN202111197563.0A patent/CN113828094A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201404765Y (en) * | 2009-05-13 | 2010-02-17 | 黄震 | Low-resistance type circulating fluidized bed flue gas desulfurization |
| CN203437036U (en) * | 2013-09-12 | 2014-02-19 | 河北环科力创环境工程有限公司 | Sintering fume desulfurization and denitrification device |
| CN103551004A (en) * | 2013-10-27 | 2014-02-05 | 黑龙江宏宇电站设备有限公司 | Desulfurization method of dry desulfurization system of coal gangue circulating fluidized bed |
| CN103644564A (en) * | 2013-11-26 | 2014-03-19 | 中国华能集团清洁能源技术研究院有限公司 | Temperature-adjustable and resistance-adjustable fluidized wind system of circulating fluidized bed boiler |
| CN208727151U (en) * | 2018-08-16 | 2019-04-12 | 北京晨晰环保工程有限公司 | A kind of new Type Coke Oven flue gas desulfurization and denitrification system |
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Address after: 225000 No. 1, Hongyuan Road, high end equipment manufacturing industrial park, Shaobo Town, Jiangdu District, Yangzhou City, Jiangsu Province Applicant after: Jiangsu Fengye Environmental Technology Group Co.,Ltd. Address before: 225000 Shaobo town Zhaoguan Jinghang village Jiangdu District Yangzhou City Jiangsu Province Applicant before: JIANGSU FENG YE TECHNOLOGY ENVIRONMENTAL PROTECTION GROUP Co.,Ltd. |
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Application publication date: 20211224 |