CN107081049B - Coal fired power plant flue gas near zero discharge system - Google Patents

Coal fired power plant flue gas near zero discharge system Download PDF

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Publication number
CN107081049B
CN107081049B CN201710285958.3A CN201710285958A CN107081049B CN 107081049 B CN107081049 B CN 107081049B CN 201710285958 A CN201710285958 A CN 201710285958A CN 107081049 B CN107081049 B CN 107081049B
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flue gas
box body
electric dust
treatment cavity
pipe
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CN107081049A (en
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郦建国
刘含笑
姚宇平
赵琳
杜依倩
何德源
杨浩锋
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Zhejiang Feida Environmental Science and Technology Co Ltd
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Zhejiang Feida Environmental Science and Technology Co Ltd
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    • 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
    • B01D53/75—Multi-step processes
    • 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
    • B01D53/46—Removing components of defined structure
    • B01D53/54—Nitrogen compounds
    • B01D53/56—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
    • B01D53/46—Removing components of defined structure
    • B01D53/64—Heavy metals or compounds thereof, e.g. mercury
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • F23J15/022—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
    • 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)
  • Chemical Kinetics & Catalysis (AREA)
  • Environmental & Geological Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Treating Waste Gases (AREA)

Abstract

The invention relates to a near-zero emission system for flue gas of a coal-fired power plant, which comprises a discharge pipe, wherein a denitration device, an electric dust remover, a wet desulphurization device, a wet electric dust remover, a flue gas reheating device and a chimney are sequentially arranged on the discharge pipe; the denitration device is provided with a first treatment cavity and a second treatment cavity, a reducing agent is arranged in the first treatment cavity, and an oxidation catalyst with Hg is arranged in the second treatment cavity; a cooling device for reducing the temperature of the flue gas is arranged on the discharging pipe between the denitration device and the electric dust collector; the invention has the advantages that: after the flue gas is processed sequentially through the denitration device, the electric dust remover, the wet desulphurization device and the wet electric dust remover, main pollutants in the flue gas can be removed one by one, and the flue gas is heated through the flue gas reheating device, so that visual pollution is eliminated, and finally, the flue gas is discharged through a chimney, so that near zero emission of the flue gas is realized, the content of pollutants in the flue gas emission is greatly reduced, the flue gas pollution is reduced, and the life quality is improved.

Description

Coal fired power plant flue gas near zero discharge system
Technical Field
The invention relates to a near zero emission system for flue gas of a coal-fired power plant.
Background
The smoke is easily discharged in the production process of a coal-fired power plant, the smoke contains pollutants such as PM, SOX, NOX, hg and the like, the conventional smoke treatment system is adopted in the conventional smoke treatment system, the conventional smoke treatment system comprises single equipment for treating one pollutant, only one pollutant in the smoke can be removed, the near-zero emission of the pollutant cannot be realized, the pollutant in the smoke seriously exceeds the standard, and the life and the health of people are easily seriously influenced.
Disclosure of Invention
The invention aims to provide a coal-fired power plant flue gas near-zero emission system, which solves the problem of pollutants in the existing flue gas emission.
In order to solve the technical problems, the invention is realized by the following technical scheme: a near-zero emission system for flue gas of a coal-fired power plant comprises a discharge pipe for discharging flue gas, wherein a denitration device, an electric dust remover, a wet desulphurization device, a wet electric dust remover, a flue gas reheating device and a chimney are sequentially arranged on the discharge pipe along the exhaust direction of the discharge pipe; the denitration device is provided with a first treatment cavity and a second treatment cavity, a reducing agent is arranged in the first treatment cavity, an oxidation catalyst with Hg is arranged in the second treatment cavity, and a return pipe is arranged on the second treatment cavity and the first treatment cavity; a cooling device for reducing the temperature of the flue gas is arranged on the discharging pipe between the denitration device and the electric dust collector, and the cooling device is connected with a heat exchange device for reducing the temperature of the flue gas to be below an acid dew point; the wet desulphurization device is connected with a demister for efficiently removing gypsum liquid drops; the on-line monitoring device for monitoring the concentration of particulate matters at the outlet of the chimney in real time is arranged on the chimney, the emission system further comprises a spraying system for modifying fly ash in flue gas, the spraying system comprises a spraying device and a modifying device, the spraying device is arranged on a discharging pipe between a cooling device and an electric dust remover, the feeding end of the modifying device is connected with the electric dust remover, and the discharging end of the modifying device is connected with the spraying device.
Preferably, denitrification facility includes box and box body, the box body sets up the bottom at the box, first process chamber sets up in the box, the second process chamber sets up in the box body, be equipped with on the box with the communicating through-hole of box body, the discharge end of back flow sets up the lower extreme at the box body, the feed end setting of back flow is in the upper end of box, can realize the many times denitration treatment of flue gas, guarantee the quality of denitration, improve subsequent dust collection efficiency, set first process chamber and second process chamber into the structure of box and box body, the installation technology of simplification, low in production cost, the mutual influence of reductant and the oxidation catalyst who takes Hg has been avoided, further improve denitration efficiency.
Preferentially, the volume ratio of the first treatment cavity to the second treatment cavity is 2, so that the rapid treatment of nitrogen oxides in flue gas can be realized, and the denitration efficiency is improved.
Preferably, the chimney includes interior pipeline and outer pipeline, and the upper end of interior pipeline is round platform form setting, and the lower extreme of interior pipeline is equipped with the connecting pipe that links to each other with the outer pipeline, and on-line monitoring device sets up on the connecting pipe, can reduce on-line monitoring device's damage, can be quick monitor the concentration of smoke and dust export particulate matter, can assemble the smoke and dust according to the occasion of difference, and practicality is good.
Preferably, the discharge pipe between the denitration device and the electric dust remover is provided with a base spraying device, the base spraying device is connected with a supply system, and the supply system sprays SO used for adsorbing SO in the flue gas into the flue gas 3 Can effectively remove SO in the flue gas 3 And the feeding treatment of the base spraying device is realized through the system, and the continuous spraying of the base pair smoke is realized.
In conclusion, the invention has the advantages that: 1. after the flue gas is treated by the denitration device, the electric dust remover, the wet desulphurization device and the wet electric dust remover in sequence, main pollutants in the flue gas can be removed one by one, and the flue gas is heated by the flue gas reheating device, so that visual pollution is eliminated, and finally, the flue gas is discharged through a chimney, so that near zero emission of the flue gas is realized, the content of pollutants in the flue gas emission is greatly reduced, the flue gas pollution is reduced, and the life quality is improved;
2. the denitration device is provided with a first treatment cavity and a second treatment cavity, so that different denitration treatment reactions can be performed on nitrogen oxides of the flue gas for the second time, the flue gas is refluxed into the first treatment cavity through the reflux pipe for multiple treatments, and the denitration efficiency can be improved;
3. arrangement of cooling means, realizationThe temperature of the flue gas is reduced, and the temperature of the flue gas is reduced to be below an acid dew point through the heat exchange device, SO that the dust removal efficiency of the electric dust remover can be improved, and the SO can be efficiently collected 3 The coal-fired power plant can meet the low emission requirement, and PM2.5 emission is effectively reduced;
4, the arrangement of the spraying system can realize the high-efficiency adsorption and removal treatment of Hg in the flue gas;
5. the demister arranged on the wet desulphurization device can effectively remove the gypsum liquid drops with high efficiency;
6. the arrangement of the on-line monitoring device can effectively monitor the concentration of the particles at the outlet of the chimney in real time, and ensure that the concentration of the particles at the outlet of the chimney is less than 1mg/m 3 。
Drawings
The invention is further described below with reference to the accompanying drawings:
FIG. 1 is a schematic structural diagram according to a first embodiment;
FIG. 2 is a schematic structural diagram of a denitration apparatus according to the present invention;
FIG. 3 is a schematic view of the structure of the chimney according to the present invention;
fig. 4 is a schematic structural diagram of the second embodiment.
Detailed Description
The first embodiment is as follows:
as shown in fig. 1, 2 and 3, a near-zero emission system for flue gas of a coal-fired power plant comprises a discharge pipe 1 for discharging flue gas, wherein a denitration device 2, an electric dust remover 3, a wet desulphurization device 4, a wet electric dust remover 5, a flue gas reheating device 6 and a chimney 7 are sequentially arranged on the discharge pipe 1 along the exhaust direction of the discharge pipe 1; the denitration device 2 is provided with a first treatment cavity 21 and a second treatment cavity 22, a reducing agent is arranged in the first treatment cavity 21, an oxidation catalyst with Hg is arranged in the second treatment cavity 22, and a return pipe 28 is arranged on the second treatment cavity 22 and the first treatment cavity 22; a cooling device 8 for reducing the temperature of the flue gas is arranged on the discharging pipe 1 between the denitration device 2 and the electric dust collector 3, and a heat exchange device 81 for reducing the temperature of the flue gas to be below an acid dew point is connected to the cooling device 8; the wet desulphurization device 4 is connected with a demister 41 for efficiently removing gypsum droplets; be equipped with the on-line monitoring device 70 that is used for real-time supervision chimney exit particulate matter concentration on the chimney 7, discharge system still including being arranged in the modified spraying system 9 of flying dust in the flue gas, spraying system 9 includes spray set 91 and modified device 92, and spray set 91 sets up on the blowing pipe 1 between cooling device 8 and electrostatic precipitator 3, and modified device 92's feed end links to each other with electrostatic precipitator 3, and modified device 92's discharge end links to each other with spray set 91.
The denitration device 2 comprises a box body 25 and a box body 26, the box body 26 is arranged at the bottom end of the box body 25, the first treatment cavity 21 is arranged in the box body 25, the second treatment cavity 22 is arranged in the box body 26, a through hole 27 communicated with the box body 26 is formed in the box body 25, the discharge end of the return pipe 28 is arranged at the lower end of the box body 26, the feed end of the return pipe 28 is arranged at the upper end of the box body 25, multiple denitration treatment of flue gas can be realized, the denitration quality is ensured, the subsequent dust removal efficiency is improved, the first treatment cavity and the second treatment cavity are arranged into a box body and box body structure, the simplified installation process is adopted, the production cost is low, the mutual influence of a reducing agent and an oxidation catalyst with Hg is avoided, the denitration efficiency is further improved, the volume ratio of the first treatment cavity 21 to the second treatment cavity 22 is 2, the rapid treatment of nitrogen oxides in the flue gas can be realized, and the denitration efficiency is improved.
Chimney 7 includes interior pipeline 71 and outer pipeline 72, and the upper end of interior pipeline 71 is round platform form setting, and the lower extreme of interior pipeline 71 is equipped with the connecting pipe 73 that links to each other with outer pipeline 72, and on-line monitoring device 70 sets up on connecting pipe 73, can reduce on-line monitoring device's damage, can be quick monitor the concentration of smoke and dust export particulate matter, can assemble the smoke and dust according to the occasion of difference, and practicality is good.
Example two:
the coal-fired power plant flue gas near-zero emission system in the first embodiment has the following differences: as shown in fig. 4, a base spraying device 10 is arranged on the discharging pipe 1 between the denitration device 2 and the electric dust remover 3, a supply system 11 is connected on the base spraying device 10, and the supply system 11 sprays the flue gas into the flue gas for adsorbing SO in the flue gas 3 Can effectively remove SO in the flue gas 3 And realizing the base spraying device by the systemAnd the feeding treatment realizes the continuous spraying of the base pair smoke.
During the use, as shown in fig. 1, the arrow indicates the direction of flue gas emission, the flue gas enters the denitrification device 2 through the discharging pipe 1, the flue gas is sequentially treated in the first treatment cavity 21 and the second treatment cavity 22, the reducing agent in the first treatment cavity 21 reacts with nitrogen oxide in the flue gas, then the oxidation catalyst with Hg in the second treatment cavity 22 reacts with nitrogen oxide, the treated flue gas flows back to the first treatment cavity 21 and the second treatment cavity 22 through the return pipe 28 to carry out denitrification treatment for the second time, then the flue gas enters the cooling device 8, the temperature of the flue gas is reduced to be below an acid dew point through the heat exchange shape 81, the flue gas can also be treated by the base spraying device 10, and then the flue gas passes through the spraying system 9, the electric dust remover 3, the wet desulfurization device 4 and the wet electric dust remover 5 to be treated by the electric dust remover, SO in the flue gas are realized 3 SOX, gypsum liquid drop get rid of, then carry out heat treatment to the flue gas through flue gas reheating device 6 to eliminate visual pollution, realize the emission of flue gas through the chimney at last, realized the nearly zero release of flue gas, greatly reduced the content of pollutant among the fume emission, reduced the flue gas pollution, improved quality of life, and through the real-time monitoring chimney export particulate matter concentration of on-line monitoring device 70, make the particulate matter concentration of chimney export be less than 1mg/m 3 。
In addition to the preferred embodiments described above, there are other embodiments of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the spirit of the present invention, which is defined in the appended claims.

Claims (3)

1. The utility model provides a coal fired power plant flue gas near zero emission system, is including the blowing pipe (1) that is used for fume emission, its characterized in that: a denitration device (2), an electric dust collector (3), a wet desulphurization device (4), a wet electric dust collector (5), a flue gas reheating device (6) and a chimney (7) are sequentially arranged on the discharging pipe (1) along the exhaust direction of the discharging pipe (1);
the denitration device (2) is provided with a first treatment cavity (21) and a second treatment cavity (22), a reducing agent is arranged in the first treatment cavity (21), an oxidation catalyst with Hg is arranged in the second treatment cavity (22), and a return pipe (28) is arranged on the second treatment cavity (22) and the first treatment cavity (22);
a cooling device (8) used for reducing the temperature of flue gas is arranged on a discharging pipe (1) between a denitration device (2) and an electric dust collector (3), a heat exchange device (81) used for reducing the temperature of the flue gas to be below an acid dew point is connected onto the cooling device (8), the denitration device (2) comprises a box body (25) and a box body (26), the box body (26) is arranged at the bottom end of the box body (25), a first processing cavity (21) is arranged in the box body (25), a second processing cavity (22) is arranged in the box body (26), a through hole (27) communicated with the box body (26) is formed in the box body (25), the discharging end of a return pipe (28) is arranged at the lower end of the box body (26), and the feeding end of the return pipe (28) is arranged at the upper end of the box body (25);
the wet desulphurization device (4) is connected with a demister (41) for efficiently removing gypsum liquid drops;
an online monitoring device (70) for monitoring the concentration of particulate matters at the outlet of the chimney in real time is arranged on the chimney (7);
the discharge system further comprises a spray system (9) for modifying fly ash in the flue gas, the spray system (9) comprises a spray device (91) and a modification device (92), the spray device (91) is arranged on the discharge pipe (1) between the cooling device (8) and the electric dust remover (3), the feeding end of the modification device (92) is connected with the electric dust remover (3), and the discharging end of the modification device (92) is connected with the spray device (91);
a base spraying device (10) is arranged on the discharging pipe (1) between the denitration device (2) and the electric dust remover (3), a supply system (11) is connected to the base spraying device, and the supply system sprays bases for adsorbing SO3 in the flue gas into the flue gas.
2. The coal fired power plant flue gas near zero emission system of claim 1, characterized in that: the volume ratio of the first processing chamber (21) to the second processing chamber (22) is 2.
3. The coal fired power plant flue gas near zero emission system of claim 1, characterized in that: the chimney (7) comprises an inner pipeline (71) and an outer pipeline (72), the upper end of the inner pipeline (71) is arranged in a circular truncated cone shape, a connecting pipe (73) connected with the outer pipeline (72) is arranged at the lower end of the inner pipeline (71), and the online monitoring device (70) is arranged on the connecting pipe (73).
CN201710285958.3A 2017-04-27 2017-04-27 Coal fired power plant flue gas near zero discharge system Active CN107081049B (en)

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CN107081049B true CN107081049B (en) 2023-03-21

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104100964A (en) * 2014-07-16 2014-10-15 西安西热锅炉环保工程有限公司 Synergistic removal system and method for realizing ultra-low emission of multiple pollutants of smoke of thermal power plant
CN105289278A (en) * 2015-11-06 2016-02-03 河北工业大学 Method for oxidizing elemental mercury by improving gas selective catalytic reduction (SCR) denitration processing system
CN206867972U (en) * 2017-04-27 2018-01-12 浙江菲达环保科技股份有限公司 A kind of coal-fired plant flue gas near-zero release system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104100964A (en) * 2014-07-16 2014-10-15 西安西热锅炉环保工程有限公司 Synergistic removal system and method for realizing ultra-low emission of multiple pollutants of smoke of thermal power plant
CN105289278A (en) * 2015-11-06 2016-02-03 河北工业大学 Method for oxidizing elemental mercury by improving gas selective catalytic reduction (SCR) denitration processing system
CN206867972U (en) * 2017-04-27 2018-01-12 浙江菲达环保科技股份有限公司 A kind of coal-fired plant flue gas near-zero release system

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