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CN112619393A - Boiler flue gas desulfurization and denitrification system - Google Patents

Boiler flue gas desulfurization and denitrification system Download PDF

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Publication number
CN112619393A
CN112619393A CN202011282360.7A CN202011282360A CN112619393A CN 112619393 A CN112619393 A CN 112619393A CN 202011282360 A CN202011282360 A CN 202011282360A CN 112619393 A CN112619393 A CN 112619393A
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Prior art keywords
flue gas
desulfurization
denitrification
boiler
adsorption tower
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Withdrawn
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CN202011282360.7A
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Chinese (zh)
Inventor
田晓亮
田永军
�田�浩
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Tianjin Haochuang Energy Saving Equipment Co ltd
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Tianjin Haochuang Energy Saving Equipment Co ltd
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Priority to CN202011282360.7A priority Critical patent/CN112619393A/en
Publication of CN112619393A publication Critical patent/CN112619393A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
    • B01D45/12—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
    • 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
    • B01D53/02—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 by adsorption, e.g. preparative gas chromatography
    • B01D53/04—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 by adsorption, e.g. preparative gas chromatography with stationary adsorbents
    • 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
    • B01D53/77—Liquid phase processes
    • B01D53/78—Liquid phase processes with gas-liquid contact
    • 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
    • B01D2251/00—Reactants
    • B01D2251/20—Reductants
    • B01D2251/206—Ammonium compounds
    • B01D2251/2062—Ammonia

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Treating Waste Gases (AREA)

Abstract

The invention is as follows: the utility model provides a boiler flue gas desulfurization denitration system, includes the boiler, desulphurization unit, denitrification facility, adsorption tower and draught fan, installs cyclone on the chimney of boiler, and during cyclone introduced desulphurization unit with the flue gas after removing dust, the flue gas through desulfurization enters into denitrification facility and carries out denitration treatment, and the processing is accomplished the back and is entered into in the adsorption tower and adsorbs the purification, and the adsorption tower air outlet is connected with the draught fan. The invention utilizes the cyclone dust collector to remove dust, utilizes the desulfurization device to purify sulfur dioxide in the flue gas, utilizes the denitration device to remove nitrogen oxide in the flue gas, and then utilizes the adsorption tower to adsorb residual nitrogen oxide and sulfur dioxide, thereby having good purification effect and being capable of reaching the emission standard. The ammonia water in the ammonia water tank of the desulphurization device can be reused, and resources are saved. In addition, the moisture that the flue gas carried when from the denitration can be collected in the setting of U-shaped pipe, and then reduces the moisture that gets into in the denitrification facility, guarantees the quality that the denitration was purified.

Description

Boiler flue gas desulfurization and denitrification system
Technical Field
The invention relates to the technical field of flue gas purification, in particular to a boiler flue gas desulfurization and denitrification system.
Background
Units such as thermal power plant all use large-scale boiler, and the boiler can produce a large amount of flue gases at the operation in-process, exists the toxic compound that contains nitre sulphur in the boiler flue gas, and these toxic compounds can cause serious pollution if directly discharge in the atmosphere, influence the atmospheric environment, therefore the processing of boiler flue gas is very important.
Nitrogen oxide and sulfur dioxide often exist simultaneously in the flue gas, often purify nitrogen oxide and sulfur dioxide not thoroughly among the current gas cleaning device, can't reach emission standard. And when the ammonia water is used for purifying sulfur dioxide, the ammonia water liquid can not be reused, thereby causing the waste of the ammonia water liquid.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides a boiler flue gas desulfurization and denitrification system.
In order to achieve the purpose, the invention adopts the following technical scheme: a boiler flue gas desulfurization and denitrification system comprises a boiler, a desulfurization device, a denitrification device, an adsorption tower and an induced draft fan, wherein a chimney of the boiler is provided with a cyclone dust collector, the cyclone dust collector introduces the dedusted flue gas into the desulfurization device, the desulfurized flue gas enters the denitrification device for denitrification treatment, the treated flue gas enters the adsorption tower for adsorption purification, and an air outlet of the adsorption tower is connected with the induced draft fan;
desulphurization unit includes desulfurization box and spray assembly, spray assembly installs on the roof in the desulfurization box, be used for spraying the aqueous ammonia in to the desulfurization box, spray assembly below is equipped with a plurality of even wind nets, even wind net and desulfurization box inner wall fixed connection, spray assembly includes the aqueous ammonia jar, the shower of being connected with aqueous ammonia tank bottom and install a plurality of shower nozzles on the shower, shower nozzle and shower all are located desulfurization box internal top, desulfurization box bottom even has the circulating pipe, the other end and the aqueous ammonia tank deck portion intercommunication of circulating pipe, install the circulating pump on the circulating pipe, desulfurization box lower part one side is equipped with the gas outlet, and the gas outlet passes through the pipeline and is connected with denitrification facility's air inlet.
The circulating pipe is provided with a first switch valve.
The denitration device is a denitration reactor, the temperature of denitration reaction in the denitration reactor is 50 ℃, and the pH value is 7.
The denitration reactor mixes the sprayed ammonia gas with the flue gas, and after the ammonia gas and the flue gas are fully mixed, the reducing agent reacts with NOx in the flue gas under the action of the catalyst to generate nitrogen gas and water.
The adsorption tower is an active carbon adsorption tower.
A U-shaped pipe and a second switch valve are installed on a pipeline connected with the denitration device and the desulfurization box body, a water outlet pipe is installed at the bottom of the U-shaped pipe, and a third switch valve is installed on the water outlet pipe.
The number of the air-homogenizing nets is not less than 2.
The invention has the beneficial effects that: the invention utilizes the cyclone dust collector to remove dust, utilizes the desulfurization device to purify sulfur dioxide in the flue gas, utilizes the denitration device to remove nitrogen oxide in the flue gas, and then utilizes the adsorption tower to adsorb residual nitrogen oxide and sulfur dioxide, thereby having good purification effect and being capable of reaching the emission standard. The ammonia water in the ammonia water tank of the desulphurization device can be reused, and resources are saved. In addition, the moisture that the flue gas carried when from the denitration can be collected in the setting of U-shaped pipe, and then reduces the moisture that gets into in the denitrification facility, guarantees the quality that the denitration was purified.
Drawings
FIG. 1 is a schematic structural view of the present invention;
in the figure: 1-a boiler; 2-cyclone dust collector; 3-a desulfurization unit; 31-a desulfurization box body; 32-a spray assembly; 33-air homogenizing net; 34-ammonia water tank; 35-a spray head; 36-a circulation pipe; 37-a switch valve; 4-a denitration device; 5-an adsorption tower; 6-induced draft fan; 7-a U-shaped tube; 8-second switch valve; 9-water outlet pipe; a No. 10-third switch valve;
the following detailed description will be made in conjunction with embodiments of the present invention with reference to the accompanying drawings.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
as shown in fig. 1, a boiler flue gas desulfurization and denitration system comprises a boiler 1, a desulfurization device 3, a denitration device 4, an adsorption tower 5 and an induced draft fan 6, wherein a chimney of the boiler 1 is provided with a cyclone dust collector 2, the cyclone dust collector 2 introduces dedusted flue gas into the desulfurization device 3, the desulfurized flue gas enters the denitration device 4 for denitration treatment, the desulfurized flue gas enters the adsorption tower 5 for adsorption and purification after the denitration treatment is completed, and an air outlet of the adsorption tower 5 is connected with the induced draft fan 6;
desulphurization unit 3 includes desulfurization box 31 and spray set 32, spray set 32 installs on desulfurization box 31 interior roof, be used for spraying the aqueous ammonia in 31 to desulfurization box, spray set 32 below is equipped with a plurality of even wind net 33, even wind net 33 and 31 inner wall fixed connection of desulfurization box, spray set 32 includes aqueous ammonia jar 34, shower and a plurality of shower nozzles 35 of installing on the shower of being connected bottom aqueous ammonia jar 34, shower nozzle 35 and shower all are located desulfurization box 31 top, desulfurization box 31 bottom even has circulating pipe 36, circulating pipe 36's the other end and aqueous ammonia jar 34 top intercommunication, install the circulating pump on the circulating pipe 36, 31 lower part one side of desulfurization box is equipped with the gas outlet, and the gas outlet passes through the pipeline and is connected with denitrification facility 4's air inlet.
The circulation pipe 36 is provided with a first on-off valve 37.
The denitration device 4 is a denitration reactor, and the temperature of denitration reaction in the denitration reactor is 50 ℃ and the pH value is 7.
The denitration reactor mixes the sprayed ammonia gas with the flue gas, and after the ammonia gas and the flue gas are fully mixed, the reducing agent reacts with NOx in the flue gas under the action of the catalyst to generate nitrogen gas and water.
The adsorption tower 5 is an activated carbon adsorption tower.
A U-shaped pipe 7 and a second switch valve 8 are installed on a pipeline connected with the denitration device 4 and the desulfurization box body 31, a water outlet pipe 9 is installed at the bottom of the U-shaped pipe 7, and a third switch valve 10 is installed on the water outlet pipe 9.
The number of the air-evening nets 33 is not less than 2.
When the device works, flue gas generated by a boiler is dedusted by the cyclone dust collector 2, the dedusted flue gas enters the desulfurizing device 3, sulfur dioxide in the flue gas is purified by the desulfurizing device 3, the air-homogenizing net 33 plays a role in slowing down the air speed of the flue gas, ammonia water sprayed by the spraying component 32 is enabled to fully react with sulfides in the flue gas, the flue gas is desulfurized and then enters the denitrifying device 4, the denitrifying device 4 is utilized to remove nitrogen oxides in the flue gas, the adsorption tower 5 is utilized to adsorb residual nitrogen oxides and sulfur dioxide, the purifying effect is good, and the emission standard can be met. The ammonia water in the ammonia water tank 34 of the desulfurization device 3 can be reused, resources are saved, the concentration of the ammonia water in the ammonia water tank 34 needs to be checked regularly, and when the concentration of the ammonia water is low, high-concentration ammonia water is added into the ammonia water tank 34. In addition, the moisture that the flue gas carried when from the denitration can be collected in the setting of U-shaped pipe 7, and then reduces the moisture that gets into in the denitrification facility 4, guarantees the quality that the denitration was purified.
Example 1
As shown in fig. 1, a boiler flue gas desulfurization and denitration system comprises a boiler 1, a desulfurization device 3, a denitration device 4, an adsorption tower 5 and an induced draft fan 6, wherein a chimney of the boiler 1 is provided with a cyclone dust collector 2, the cyclone dust collector 2 introduces dedusted flue gas into the desulfurization device 3, the desulfurized flue gas enters the denitration device 4 for denitration treatment, the desulfurized flue gas enters the adsorption tower 5 for adsorption and purification after the denitration treatment is completed, and an air outlet of the adsorption tower 5 is connected with the induced draft fan 6;
desulphurization unit 3 includes desulfurization box 31 and spray set 32, spray set 32 installs on desulfurization box 31 interior roof, be used for spraying the aqueous ammonia in 31 to desulfurization box, spray set 32 below is equipped with a plurality of even wind net 33, even wind net 33 and 31 inner wall fixed connection of desulfurization box, spray set 32 includes aqueous ammonia jar 34, shower and a plurality of shower nozzles 35 of installing on the shower of being connected bottom aqueous ammonia jar 34, shower nozzle 35 and shower all are located desulfurization box 31 top, desulfurization box 31 bottom even has circulating pipe 36, circulating pipe 36's the other end and aqueous ammonia jar 34 top intercommunication, install the circulating pump on the circulating pipe 36, 31 lower part one side of desulfurization box is equipped with the gas outlet, and the gas outlet passes through the pipeline and is connected with denitrification facility 4's air inlet.
The circulation pipe 36 is provided with a first on-off valve 37.
The denitration device 4 is a denitration reactor, and the temperature of denitration reaction in the denitration reactor is 50 ℃ and the pH value is 7.
The denitration reactor mixes the sprayed ammonia gas with the flue gas, and after the ammonia gas and the flue gas are fully mixed, the reducing agent reacts with NOx in the flue gas under the action of the catalyst to generate nitrogen gas and water.
The adsorption tower 5 is an activated carbon adsorption tower.
A U-shaped pipe 7 and a second switch valve 8 are installed on a pipeline connected with the denitration device 4 and the desulfurization box body 31, a water outlet pipe 9 is installed at the bottom of the U-shaped pipe 7, and a third switch valve 10 is installed on the water outlet pipe 9.
The number of the air-uniforming nets 33 is 2.
Example 2
As shown in fig. 1, a boiler flue gas desulfurization and denitration system comprises a boiler 1, a desulfurization device 3, a denitration device 4, an adsorption tower 5 and an induced draft fan 6, wherein a chimney of the boiler 1 is provided with a cyclone dust collector 2, the cyclone dust collector 2 introduces dedusted flue gas into the desulfurization device 3, the desulfurized flue gas enters the denitration device 4 for denitration treatment, the desulfurized flue gas enters the adsorption tower 5 for adsorption and purification after the denitration treatment is completed, and an air outlet of the adsorption tower 5 is connected with the induced draft fan 6;
desulphurization unit 3 includes desulfurization box 31 and spray set 32, spray set 32 installs on desulfurization box 31 interior roof, be used for spraying the aqueous ammonia in 31 to desulfurization box, spray set 32 below is equipped with a plurality of even wind net 33, even wind net 33 and 31 inner wall fixed connection of desulfurization box, spray set 32 includes aqueous ammonia jar 34, shower and a plurality of shower nozzles 35 of installing on the shower of being connected bottom aqueous ammonia jar 34, shower nozzle 35 and shower all are located desulfurization box 31 top, desulfurization box 31 bottom even has circulating pipe 36, circulating pipe 36's the other end and aqueous ammonia jar 34 top intercommunication, install the circulating pump on the circulating pipe 36, 31 lower part one side of desulfurization box is equipped with the gas outlet, and the gas outlet passes through the pipeline and is connected with denitrification facility 4's air inlet.
The circulation pipe 36 is provided with a first on-off valve 37.
The denitration device 4 is a denitration reactor, and the temperature of denitration reaction in the denitration reactor is 50 ℃ and the pH value is 7.
The denitration reactor mixes the sprayed ammonia gas with the flue gas, and after the ammonia gas and the flue gas are fully mixed, the reducing agent reacts with NOx in the flue gas under the action of the catalyst to generate nitrogen gas and water.
The adsorption tower 5 is an activated carbon adsorption tower.
A U-shaped pipe 7 and a second switch valve 8 are installed on a pipeline connected with the denitration device 4 and the desulfurization box body 31, a water outlet pipe 9 is installed at the bottom of the U-shaped pipe 7, and a third switch valve 10 is installed on the water outlet pipe 9.
The number of the air-uniforming nets 33 is 4.
The invention has been described in connection with the accompanying drawings, it is to be understood that the invention is not limited to the specific embodiments disclosed, but is intended to cover various modifications, adaptations or uses of the invention, and all such modifications and variations are within the scope of the invention.

Claims (7)

1. A boiler flue gas desulfurization and denitrification system is characterized by comprising a boiler (1), a desulfurization device (3), a denitrification device (4), an adsorption tower (5) and an induced draft fan (6), wherein a chimney of the boiler (1) is provided with a cyclone dust collector (2), the cyclone dust collector (2) introduces the dedusted flue gas into the desulfurization device (3), the desulfurized flue gas enters the denitrification device (4) for denitrification treatment, the desulfurized flue gas enters the adsorption tower (5) for adsorption purification after the denitrification treatment is finished, and an air outlet of the adsorption tower (5) is connected with the induced draft fan (6);
the desulfurizing device (3) comprises a desulfurizing box body (31) and a spraying component (32), the spraying component (32) is arranged on the inner top wall of the desulfurizing box body (31), be used for spraying the aqueous ammonia in to desulfurization box (31), spray assembly (32) below is equipped with a plurality of even wind net (33), even wind net (33) and desulfurization box (31) inner wall fixed connection, spray assembly (32) include ammonia water jar (34), shower nozzle be connected with ammonia water jar (34) bottom and install a plurality of shower nozzles (35) on the shower nozzle, shower nozzle (35) and shower nozzle all are located desulfurization box (31) top, desulfurization box (31) bottom even has circulating pipe (36), the other end and ammonia water jar (34) top intercommunication of circulating pipe (36), install the circulating pump on circulating pipe (36), desulfurization box (31) lower part one side is equipped with the gas outlet, and the gas outlet passes through the pipeline and is connected with the air inlet of denitrification facility (4).
2. The boiler flue gas desulfurization and denitrification system according to claim 1, wherein the circulation pipe (36) is provided with a first switch valve (37).
3. The system for desulfurization and denitrification of boiler flue gas according to claim 1, wherein the denitrification device (4) is a denitrification reactor, and the denitrification reaction in the denitrification reactor has a temperature of 50 ℃ and a pH of 7.
4. The boiler flue gas desulfurization and denitrification system according to claim 3, wherein the denitrification reactor mixes the injected ammonia gas with the flue gas, and after the ammonia gas and the flue gas are sufficiently mixed, the reducing agent reacts with NOx in the flue gas under the action of the catalyst to generate nitrogen and water.
5. The boiler flue gas desulfurization and denitrification system according to claim 1, wherein the adsorption tower (5) is an activated carbon adsorption tower.
6. The boiler flue gas desulfurization and denitrification system according to claim 3, wherein a U-shaped pipe (7) and a second switch valve (8) are installed on a pipeline connecting the denitrification device (4) and the desulfurization tank body (31), a water outlet pipe (9) is installed at the bottom of the U-shaped pipe (7), and a third switch valve (10) is installed on the water outlet pipe (9).
7. The boiler flue gas desulfurization and denitrification system according to claim 1, wherein the number of the air-uniforming nets (33) is not less than 2.
CN202011282360.7A 2020-11-17 2020-11-17 Boiler flue gas desulfurization and denitrification system Withdrawn CN112619393A (en)

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CN202011282360.7A CN112619393A (en) 2020-11-17 2020-11-17 Boiler flue gas desulfurization and denitrification system

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CN202011282360.7A CN112619393A (en) 2020-11-17 2020-11-17 Boiler flue gas desulfurization and denitrification system

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN118925355A (en) * 2024-10-11 2024-11-12 苏能(锡林郭勒)发电有限公司 A flue gas treatment device and method for a thermal power plant

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Publication number Priority date Publication date Assignee Title
CN103920376A (en) * 2014-04-30 2014-07-16 四川省达州钢铁集团有限责任公司 Low-energy-consumption hybrid white smoke elimination device
CN104791817A (en) * 2015-03-31 2015-07-22 广西智通节能环保科技有限公司 Smoke denitration and desulfuration device for boiler flue
CN204637947U (en) * 2015-05-28 2015-09-16 福建光明星能源环保有限公司 A kind of boiler flue gas purification treating apparatus
WO2015185000A1 (en) * 2014-06-05 2015-12-10 魏雄辉 Process and device for desulphurization and denitration of flue gas
CN111298619A (en) * 2020-02-27 2020-06-19 四川恒泰环境技术有限责任公司 Electric smelting furnace flue gas treatment device and method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103920376A (en) * 2014-04-30 2014-07-16 四川省达州钢铁集团有限责任公司 Low-energy-consumption hybrid white smoke elimination device
WO2015185000A1 (en) * 2014-06-05 2015-12-10 魏雄辉 Process and device for desulphurization and denitration of flue gas
CN104791817A (en) * 2015-03-31 2015-07-22 广西智通节能环保科技有限公司 Smoke denitration and desulfuration device for boiler flue
CN204637947U (en) * 2015-05-28 2015-09-16 福建光明星能源环保有限公司 A kind of boiler flue gas purification treating apparatus
CN111298619A (en) * 2020-02-27 2020-06-19 四川恒泰环境技术有限责任公司 Electric smelting furnace flue gas treatment device and method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN118925355A (en) * 2024-10-11 2024-11-12 苏能(锡林郭勒)发电有限公司 A flue gas treatment device and method for a thermal power plant
CN118925355B (en) * 2024-10-11 2025-01-28 苏能(锡林郭勒)发电有限公司 A flue gas treatment device and method for a thermal power plant

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Application publication date: 20210409