CN212440119U - System for removing acid gas in flue gas - Google Patents
System for removing acid gas in flue gas Download PDFInfo
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- CN212440119U CN212440119U CN202021702351.4U CN202021702351U CN212440119U CN 212440119 U CN212440119 U CN 212440119U CN 202021702351 U CN202021702351 U CN 202021702351U CN 212440119 U CN212440119 U CN 212440119U
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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
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- 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
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
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Abstract
The utility model discloses an acid gas desorption system in flue gas, with the acid gas composition integration desorption in the coal-fired flue gas, dewater the cooling to the flue gas through setting up the cooling tower, concentrate the recovery processing with the waste water of desorption, realize the waste water zero release, through setting up high temperature flue gas cooler and air heat transfer, when reducing the flue gas temperature, retrieve high temperature flue gas heat, carry out the drying agent to in the drying tower with the medium temperature air and heat the dehydration regeneration, and heat the regeneration to the adsorbent in the adsorption tower, high temperature flue gas heat make full use of, through setting up cold volume recoverer, retrieve the cold volume of the low temperature flue gas that the adsorption tower top comes out, be used for the coolant liquid to cool down once more, set up the adsorption tower under the low temperature operating mode, the acid gas in the disposable adsorption flue gas, initial investment is little, save the occupation of land.
Description
Technical Field
The utility model belongs to the technical field of the flue gas pollutant purifies, concretely relates to acid gas desorption system in flue gas.
Background
The utilization mode of direct combustion of coal can generate a large amount of acidic waste gas pollutants, such as smoke dust and SO2NOx and the like seriously affect the balance of ecological environment and the physical health of people. NOx is mainly composed of NO and also contains a small amount of NO2. At present, the mainstream flue gas purification technology is to perform desulfurization, denitrification and dust removal by adopting the combination of SCR denitration, ESP electric precipitation and FGD wet desulphurization.
The traditional flue gas desulfurization and denitration adopt a separate treatment method, although a certain achievement is achieved, the equipment is huge, the technology is complex, the cost is overhigh, and great influence is caused to the development of a thermal power plant. For example, the FGD wet desulphurization technology occupies a large area, needs a large amount of limestone as an auxiliary absorbent, is easy to corrode and scale the inner wall of the equipment and has high maintenance difficulty. The SCR denitration technology has high initial investment cost, ammonia or urea needs to be continuously consumed as a reducing agent, and the SCR catalyst is easy to be poisoned and invalid, has high treatment difficulty and high operation cost. Therefore, the research of novel and efficient flue gas desulfurization and denitration technology becomes the focus of the researchers at home and abroad.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an acid gas desorption system in flue gas to overcome prior art's defect, the utility model discloses can desorption acid gas in the coal-fired flue gas simultaneously, the desorption is efficient, and the running cost is low, and the device is easily maintained.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a system for removing acid gas in flue gas comprises a high-temperature flue gas cooler, a No. 1 fan, a dust remover, a cooling tower, a cooling circulating pump, a cooler, a cold energy recoverer, a drying tower, a refrigerating unit, a cryogenic cooler, an adsorption tower and a No. 2 fan;
the cooling tower comprises a high-temperature flue gas cooler, a dust remover, a cooling tower, a drying tower, a cooling circulation pump, a cooling capacity recoverer, a cooling capacity recovery device and a cooling capacity recovery device, wherein a flue gas inlet of the high-temperature flue gas cooler is connected to a high-temperature flue gas outlet of an air preheater of a power plant, a flue gas outlet of the high-temperature flue gas cooler is connected to the dust remover, an outlet of the dust remover is connected to the lower section of the cooling tower, a flue gas outlet at the top of the cooling tower is connected to the bottom of the drying tower, a cooling liquid outlet at the lower part;
a dry flue gas outlet at the top of the drying tower is connected to a flue gas inlet of a cryogenic cooler, a flue gas outlet of the cryogenic cooler is connected to the bottom of the adsorption tower, an outlet at the top of the adsorption tower is connected to a flue gas inlet of a cold energy recoverer, and a flue gas outlet of the cold energy recoverer is connected to a chimney through a No. 2 fan;
a cooling liquid inlet of the cryogenic cooler is connected with an outlet of the cooling unit, and a cooling liquid outlet of the cryogenic cooler is connected with an inlet of the cooling unit;
the inlet of the air end of the high-temperature flue gas cooler is connected with a No. 1 fan, the outlet of the air end of the high-temperature flue gas cooler is respectively connected to the upper ends of a chimney, a drying tower and an adsorption tower, the air outlet at the lower end of the drying tower is connected to atmosphere evacuation, and the regenerated gas outlet at the lower end of the adsorption tower is connected to a downstream purification and recovery section.
Further, the cooling liquid in the cooling tower is water.
Further, a molecular sieve or silica gel is arranged in the drying tower.
Further, active carbon is arranged in the adsorption tower.
Furthermore, the drying towers are two, namely a No. 1 drying tower and a No. 2 drying tower, and the flue gas outlets at the top of the cooling tower are respectively connected to the bottoms of the No. 1 drying tower and the No. 2 drying tower; the dry flue gas outlets at the tops of the No. 1 drying tower and the No. 2 drying tower are connected to a flue gas inlet of a cryogenic cooler; the outlet of the air end of the high-temperature flue gas cooler is connected to one path of the drying tower and is respectively connected to the upper ends of the 1# drying tower and the 2# drying tower, and the outlet of the air at the lower ends of the 1# drying tower and the 2# drying tower is connected to the atmosphere for emptying.
Furthermore, the adsorption towers are two, namely a 1# adsorption tower and a 2# adsorption tower, a flue gas outlet of the cryogenic cooler is connected to the bottoms of the 1# adsorption tower and the 2# adsorption tower respectively, and outlets at the tops of the 1# adsorption tower and the 2# adsorption tower are connected to a flue gas inlet of the cold energy recoverer; the outlet of the air end of the high-temperature flue gas cooler is connected to one path of the adsorption tower and is respectively connected to the upper ends of the 1# adsorption tower and the 2# adsorption tower, and the outlet of the regenerated gas at the lower ends of the 1# adsorption tower and the 2# adsorption tower is connected to the downstream purification and recovery section.
Compared with the prior art, the utility model discloses following profitable technological effect has:
the utility model discloses with the acid gas composition integration desorption in the coal-fired flue gas, dewater the cooling to the flue gas through setting up the cooling tower, concentrate the recovery processing with the waste water of desorption, realize the waste water zero release, through setting up high temperature flue gas cooler and air heat transfer, when reducing the flue gas temperature, retrieve high temperature flue gas heat, carry out the drier to the drying tower with the medium temperature air and heat the dehydration regeneration, and heat the regeneration to the adsorbent in the adsorption tower, the abundant recycle of high temperature flue gas heat, through setting up cold volume recoverer, the cold volume of the low temperature flue gas of coming out at the top of the recovery adsorption tower, be used for the coolant liquid to cool down once more, set up the adsorption tower under the low temperature operating mode, acid gas in the disposable adsorption flue gas, initial investment is little, save and occupy an.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation.
Fig. 1 is a schematic structural diagram of the present invention.
The system comprises a high-temperature flue gas cooler 1, a fan 1# 2, a dust remover 3, a cooling tower 4, a cooling circulating pump 5, a cooler 6, a cold recovery device 7, a drying tower 1# 8, a drying tower 2# 9, a refrigerating unit 10, a cryogenic cooler 11, an adsorption tower 1# 12, an adsorption tower 2# 13 and a fan 2# 14.
Detailed Description
The present invention is described in further detail below:
referring to fig. 1, a system for removing acid gas in flue gas comprises a high-temperature flue gas cooler 1, a # 1 fan 2, a dust remover 3, a cooling tower 4, a cooling circulating pump 5, a cooler 6, a cold energy recoverer 7, a drying tower, a refrigerating unit 10, a cryogenic cooler 11, an adsorption tower and a # 2 fan 14;
a flue gas inlet of the high-temperature flue gas cooler 1 is connected to a high-temperature flue gas outlet of an air preheater of a power plant, a flue gas outlet of the high-temperature flue gas cooler 1 is connected to a dust remover 3, an outlet of the dust remover 3 is connected to the lower section of a cooling tower 4, process water is arranged in the cooling tower 4 to serve as cooling liquid, a flue gas outlet at the top of the cooling tower 4 is connected to the bottom of a drying tower, a molecular sieve or silica gel is arranged in the drying tower, a cooling liquid outlet at the lower part of the cooling tower 4 is connected to a cooling liquid inlet of a cooler 6 through a cooling circulating pump 5, a cooling liquid outlet of the cooler 6 is connected to a cooling liquid inlet of a cooling capacity recoverer 7; a dry flue gas outlet at the top of the drying tower is connected to a flue gas inlet of a cryogenic cooler 11, a flue gas outlet of the cryogenic cooler 11 is connected to the bottom of an adsorption tower, activated carbon is arranged in the adsorption tower, an outlet at the top of the adsorption tower is connected to a flue gas inlet of a cold energy recoverer 7, and a flue gas outlet of the cold energy recoverer 7 is connected to a chimney through a No. 2 fan 14; a cooling liquid inlet of the cryogenic cooler 11 is connected with an outlet of the cooling unit 10, and a cooling liquid outlet of the cryogenic cooler 11 is connected with an inlet of the cooling unit 10; an inlet of an air end of the high-temperature flue gas cooler 1 is connected with the No. 1 fan 2, an outlet of the air end of the high-temperature flue gas cooler 1 is connected to the upper ends of a chimney and a drying tower and the upper end of an adsorption tower respectively, an air outlet at the lower end of the drying tower is connected to atmosphere evacuation, and a regenerated gas outlet at the lower end of the adsorption tower is connected to a downstream purification and recovery section.
The two drying towers are respectively a No. 1 drying tower 8 and a No. 2 drying tower 9, and the flue gas outlets at the top of the cooling tower 4 are respectively connected to the bottoms of the No. 1 drying tower 8 and the No. 2 drying tower 9; the dry flue gas outlets at the tops of the No. 1 drying tower 8 and the No. 2 drying tower 9 are connected to the flue gas inlet of the cryogenic cooler 11; the outlet of the air end of the high-temperature flue gas cooler 1 is connected to one path of the drying tower and is respectively connected to the upper ends of the No. 1 drying tower 8 and the No. 2 drying tower 9, and the air outlet of the lower ends of the No. 1 drying tower 8 and the No. 2 drying tower 9 is connected to the atmosphere for emptying.
The adsorption towers are two, namely a 1# adsorption tower 12 and a 2# adsorption tower 13, a flue gas outlet of the cryogenic cooler 11 is connected to the bottoms of the 1# adsorption tower 12 and the 2# adsorption tower 13 respectively, and outlets at the tops of the 1# adsorption tower 12 and the 2# adsorption tower 13 are connected to a flue gas inlet of the cold energy recoverer 7; an outlet of an air end of the high-temperature flue gas cooler 1 is connected to one path of the adsorption tower and is respectively connected to the upper ends of the adsorption tower No. 1 12 and the adsorption tower No. 2 13, and a regenerated gas outlet at the lower ends of the adsorption tower No. 1 and the adsorption tower No. 2 13 is connected to a downstream purification and recovery section.
For the sake of clarity, the present invention will be further described in detail with reference to the following embodiments and accompanying drawings. It is understood by those skilled in the art that the following descriptions are not intended to limit the scope of the present invention, and any modifications and variations based on the present invention are within the scope of the present invention.
Referring to fig. 1, an acid gas desorption system in flue gas, include the high temperature flue gas cooler 1 that links to each other with the air preheater high temperature exhanst gas outlet of power plant, the exhanst gas outlet of high temperature flue gas cooler 1 links to each other with dust remover 3, the flue gas after the dust removal links to each other with cooling tower 4 hypomere, be equipped with the process water as the coolant liquid in the cooling tower 4, the flue gas after 4 washing cooling of cooling tower is gone to 1# drying tower 8 bottom or 2# drying tower 9 bottom from cooling tower 4 top, the coolant liquid of cooling tower 4 bottom goes to cooling circulation pump 5 entry, cooling circulation pump 5 links to each other with 6 coolant liquid entry end of cooler, 6 coolant liquid exit end of cooler links to each other with 7 coolant liquid entry ends of cold volume recoverer, 7 coolant liquid exit ends of cold volume communicate with cooling tower.
Dry flue gas after 8 and 9 # drying towers of 1# drying tower is to cryogenic cooler 11, and 11 exhanst gas outlets of cryogenic cooler link to each other with 12 bottoms of 1# adsorption tower and 13 bottoms of 2# adsorption tower, and the low temperature flue gas after the purification is to 7 flue gas inlets of cold volume recoverer, and 7 exhanst gas outlets of cold volume recoverer link to each other with 14 entrances of 2# fan, and the chimney is to in 14 exports of 2# fan.
Molecular sieves or silica gel are arranged in the No. 1 drying tower 8 and the No. 2 drying tower 9.
The # 1 adsorption tower 12 and the # 2 adsorption tower 13 are internally provided with concentrated activated carbon.
11 coolant inlet ends of cryocoolers are connected with the outlet of refrigerating unit 10, and 11 coolant outlet ends of cryocoolers are connected with the inlet of refrigerating unit 10.
The inlet of the air end of the high-temperature flue gas cooler 1 is connected with the outlet of the fan 1# 2, the fan 1# 2 is communicated with the air, the outlet of the air end of the high-temperature flue gas cooler 1 is divided into three paths, one path goes to a chimney, the other path goes to the upper end of the drying tower 1# 8 or the upper end of the drying tower 2# 9, the other path goes to the upper end of the adsorption tower 1# 12 and the upper end of the adsorption tower 2# 13, the air outlets at the lower ends of the drying tower 1# 8 and the drying tower 2# 9 go to the atmosphere for emptying, and the regenerated gas outlet at the lower ends of the adsorption tower 1# 12 and.
The technical process and the principle of the utility model are as follows:
the high-temperature flue gas of the coal-fired boiler is subjected to primary heat exchange by an air preheater, enters the high-temperature flue gas cooler 1 for secondary cooling, is dedusted by the deduster 3 to reduce the dust concentration to 10mg/m3The flue gas after dust removal is reducedAnd (3) cooling the temperature of the temperature tower 4 to 5-10 ℃ by water washing, recycling the washing liquid in the temperature tower 4 after heat exchange with a cold energy recoverer through a cooler 6, and recovering the wastewater removed from the flue gas to a wastewater treatment system for centralized treatment.
Flue gas at the top of the cooling tower 4 goes to a drying tower for fine dehydration, a molecular sieve or silica gel is arranged in the drying tower, the moisture content of the flue gas after fine dehydration is not more than 10ppm, the two drying towers are connected in parallel, one drying tower is used, the other drying tower is heated and regenerated by hot air exchanging heat with the high-temperature flue gas cooler 1, and the two drying towers work alternately.
The flue gas dried by the drying tower goes to a deep cooling cooler 11 for deep cooling, the temperature is reduced to-20 to-30 ℃, and the cold energy is provided by a refrigerating unit 10.
The cryogenic low-temperature flue gas goes to an adsorption tower, fine-selected active carbon is arranged in the adsorption tower, and SO in the flue gas is removed2，NOXWhen the acid gas is adsorbed at one time, the SO at the outlet of the adsorption tower2Concentration and NOXThe concentration is not more than 1mg/m3The two adsorption towers are connected in parallel, one adsorption tower is used, the other adsorption tower is heated and regenerated by hot air exchanging heat with the high-temperature flue gas cooler 1, a regenerated gas outlet goes to a downstream purification and recovery section, and the two adsorption towers work alternately.
The low-temperature flue gas purified by the adsorption tower is discharged to a chimney after the cold energy is recovered by a cold energy recoverer 7.
Claims (6)
1. A system for removing acid gas in flue gas is characterized by comprising a high-temperature flue gas cooler (1), a No. 1 fan (2), a dust remover (3), a cooling tower (4), a cooling circulating pump (5), a cooler (6), a cold energy recoverer (7), a drying tower, a refrigerating unit (10), a cryogenic cooler (11), an adsorption tower and a No. 2 fan (14);
the flue gas inlet of the high-temperature flue gas cooler (1) is connected to the high-temperature flue gas outlet of an air preheater of a power plant, the flue gas outlet of the high-temperature flue gas cooler (1) is connected to the dust remover (3), the outlet of the dust remover (3) is connected to the lower section of the cooling tower (4), the flue gas outlet at the top of the cooling tower (4) is connected to the bottom of the drying tower, the cooling liquid outlet at the lower part of the cooling tower (4) is connected to the cooling liquid inlet of the cooler (6) through a cooling circulating pump (5), the cooling liquid outlet of the cooler (6) is connected to the cooling liquid inlet of the cold energy recoverer (7), and the cooling liquid outlet of the cold energy recoverer (7) is connected;
a dry flue gas outlet at the top of the drying tower is connected to a flue gas inlet of a cryogenic cooler (11), a flue gas outlet of the cryogenic cooler (11) is connected to the bottom of the adsorption tower, an outlet at the top of the adsorption tower is connected to a flue gas inlet of a cold energy recoverer (7), and a flue gas outlet of the cold energy recoverer (7) is connected to a chimney through a No. 2 fan (14);
a cooling liquid inlet of the cryogenic cooler (11) is connected with an outlet of the cooling unit (10), and a cooling liquid outlet of the cryogenic cooler (11) is connected with an inlet of the cooling unit (10);
the air end inlet of the high-temperature flue gas cooler (1) is connected with the No. 1 fan (2), the air end outlet of the high-temperature flue gas cooler (1) is respectively connected to the upper ends of a chimney and a drying tower and the upper end of an adsorption tower, the air outlet at the lower end of the drying tower is connected to atmosphere evacuation, and the regenerated gas outlet at the lower end of the adsorption tower is connected to a downstream purification recovery section.
2. The system for removing the acid gases in the flue gas according to claim 1, wherein the cooling liquid in the cooling tower (4) is water.
3. The system for removing acid gases in flue gas according to claim 1, wherein a molecular sieve or silica gel is arranged in the drying tower.
4. The system for removing acid gases in flue gas according to claim 1, wherein activated carbon is arranged in the adsorption tower.
5. The system for removing the acid gas in the flue gas according to claim 1, wherein the number of the drying towers is two, namely a # 1 drying tower (8) and a # 2 drying tower (9), and the flue gas outlet at the top of the cooling tower (4) is connected to the bottoms of the # 1 drying tower (8) and the # 2 drying tower (9), respectively; the dry flue gas outlets at the tops of the No. 1 drying tower (8) and the No. 2 drying tower (9) are connected to a flue gas inlet of a cryogenic cooler (11); the outlet of the air end of the high-temperature flue gas cooler (1) is connected to one path of the drying tower and is respectively connected to the upper ends of the 1# drying tower (8) and the 2# drying tower (9), and the air outlets at the lower ends of the 1# drying tower (8) and the 2# drying tower (9) are connected to the atmosphere for emptying.
6. The system for removing the acid gas in the flue gas according to claim 1, wherein the adsorption towers are provided with two adsorption towers, namely a # 1 adsorption tower (12) and a # 2 adsorption tower (13), the flue gas outlet of the cryogenic cooler (11) is connected to the bottoms of the # 1 adsorption tower (12) and the # 2 adsorption tower (13), and the outlets at the tops of the # 1 adsorption tower (12) and the # 2 adsorption tower (13) are connected to the flue gas inlet of the cold energy recoverer (7); an outlet of an air end of the high-temperature flue gas cooler (1) is connected to one path of the adsorption tower and is respectively connected to the upper ends of a 1# adsorption tower (12) and a 2# adsorption tower (13), and a regenerated gas outlet at the lower ends of the 1# adsorption tower (12) and the 2# adsorption tower (13) is connected to a downstream purification and recovery section.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021702351.4U CN212440119U (en) | 2020-08-14 | 2020-08-14 | System for removing acid gas in flue gas |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021702351.4U CN212440119U (en) | 2020-08-14 | 2020-08-14 | System for removing acid gas in flue gas |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111841066A (en) * | 2020-08-14 | 2020-10-30 | 中国华能集团清洁能源技术研究院有限公司 | System and method for removing acid gas in flue gas |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111841066A (en) * | 2020-08-14 | 2020-10-30 | 中国华能集团清洁能源技术研究院有限公司 | System and method for removing acid gas in flue gas |
| CN111841066B (en) * | 2020-08-14 | 2024-06-11 | 中国华能集团清洁能源技术研究院有限公司 | System and method for removing acid gas in flue gas |
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