CN111871134A - Flue gas emission control and recycling system of coal-fired power plant - Google Patents
Flue gas emission control and recycling system of coal-fired power plant Download PDFInfo
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- CN111871134A CN111871134A CN202010855265.5A CN202010855265A CN111871134A CN 111871134 A CN111871134 A CN 111871134A CN 202010855265 A CN202010855265 A CN 202010855265A CN 111871134 A CN111871134 A CN 111871134A
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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
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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
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
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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
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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
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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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
- B01D53/80—Semi-solid phase processes, i.e. by using slurries
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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
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8631—Processes characterised by a specific device
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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
- B01D53/86—Catalytic processes
- B01D53/90—Injecting reactants
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- 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
Abstract
The invention discloses a novel system for controlling smoke emission by high-temperature electric precipitation, SCR denitration, normal-temperature or low-temperature electric precipitation and wet or semi-dry desulfurization, wherein smoke dust is firstly subjected to high-temperature electric precipitation by an SCR denitration preposition to realize 80-95% efficient dust removal, and then is subjected to SCR denitration, normal-temperature or low-temperature electric precipitation and wet or semi-dry desulfurization to realize ultra-low smoke emission. The high-temperature electric dust collector reduces the abrasion of smoke dust to the SCR catalyst, prolongs the service life of the SCR catalyst, improves the denitration efficiency, avoids the blockage of the air preheater, and ensures that the smoke dust collected at high temperature adsorbs other pollutants less and can be used as raw materials in the aspects of chemical engineering, building materials and the like to be recycled. The conventional or low-temperature electric dust removal only has about 5-20% of the original dust at the inlet, so that the ultralow emission of the electric dust removal can be easily realized, a foundation is laid for improving the desulfurization efficiency and the gypsum quality, and the resource of sulfur is guaranteed.
Description
Technical Field
The invention relates to a flue gas treatment system of a coal-fired power plant, in particular to a flue gas emission control and recycling system of the coal-fired power plant.
Background
The removal of three major pollutants of a coal-fired boiler mainly adopts Selective Catalytic Reduction (SCR) or Selective Non-catalytic Reduction (SNCR) denitration, adopts electric dust collector (ESP) to collect smoke dust, adopts limestone-gypsum method and ammonia Desulfurization (FGD) and the like, and firstly carries out SCR or SNCR denitration on coal-fired smoke at high temperature and then carries out ESP dedusting and FGD Desulfurization.
Because the SCR is positioned at the front end of flue gas treatment, a large amount of smoke dust in the flue gas can cause abrasion to an SCR catalyst and an air preheater, and meanwhile, the efficiency of the SCR reactor can be reduced due to the participation of a large amount of smoke dust. With the continuous promotion of environmental protection indexes, the existing denitration and desulfurization technology realizes ultralow emission (the ultralow emission refers to chimney inlet particulate matters, NOx and SO)2Are generally respectively 5mg/m3, 50mg/m3And 35mg/m3Below) has generated a series of side effects such as severe service life reduction due to catalyst attrition, blockage of the air preheater, ammonia slip, etc.
Disclosure of Invention
The method aims to solve the problems on the premise of not changing the existing environment-friendly facility of the coal-fired boiler and meet the existing ultralow emission index.The invention collects 80-95% of smoke dust by additionally arranging the high-temperature electrostatic dust collector before SCR, reduces the abrasion of an SCR catalyst and an air preheater, enhances the activity of gaseous pollutants under the action of a strong electric field, improves the SCR denitration, dust removal of the dust collector and FGD desulfurization efficiency, and realizes the compound pollution cooperative control, so the invention provides a novel process of preposed electric dust removal, cooperative SCR flue gas denitration, a conventional electric dust collector or bag dust collector or electric bag dust collector and FGD wet desulfurization, and realizes dust removal and NO wet desulfurizationX、SO2A novel system for high-efficiency recycling of ultra-low emission and sulfur dust.
The invention is realized by adopting the following technical scheme: a flue gas emission control and recycling system of a coal-fired power plant comprises an SCR (selective catalytic reduction) denitration device, a dust remover and a desulfurization tower, wherein a high-temperature electrostatic dust remover is additionally arranged in a high-temperature region (300 plus 500 ℃) in front of the SCR denitration device, and flue gas of the coal-fired power plant sequentially passes through the high-temperature electrostatic dust remover, the SCR denitration device, the dust remover and the desulfurization tower. The coal-fired power plant adopts a new process of high-temperature electric dust removal, SCR, dust remover and wet or semi-dry desulphurization flue gas ultra-low emission, the high-temperature electrostatic dust remover collects 80-95% of smoke dust, reduces the abrasion of SCR catalyst and air preheater, enhances the activity of gaseous pollutants under the action of a strong electric field, improves the SCR denitration, dust removal and FGD desulphurization efficiency, and realizes the compound pollution cooperative control. The smoke dust collected at high temperature can be used as raw materials in the aspects of chemical engineering, building materials and the like due to low adsorption of other pollutants, and is recycled. The dust collector can easily realize dust removal and ultralow emission because the inlet smoke dust is only about 5-20% of the original dust, lays a foundation for improving the desulfurization efficiency and the gypsum quality and also provides a guarantee for the resource utilization of sulfur.
In the flue gas emission control and recycling system of the coal-fired power plant, the high-temperature electrostatic dust collector is a high-temperature electrostatic dust collector with one to two electric fields.
In the flue gas emission control and recycling system of the coal-fired power plant, the power supply of the high-temperature electrostatic dust collector adopts a power frequency power supply, a high-frequency power supply, a three-phase power supply or a high-frequency pulse power supply.
The smoke emission of the system is lower than 5mg/m3。
In the flue gas emission control and recycling system of the coal-fired power plant, the high-temperature electrostatic dust collector adopts a high-temperature resistant body, an insulating material and a heat preservation design.
According to the flue gas emission control and recycling system of the coal-fired power plant, the overall design is carried out on a newly-built coal-fired power plant, the SCR denitration device is moved backwards, and the high-temperature electrostatic dust collector is additionally arranged in front of the SCR denitration device; for old power plant transformation, can install the platform additional above former dust remover, install high temperature electrostatic precipitator, reform transform SCR denitrification facility entry flue, make SCR denitrification facility be in high temperature electrostatic precipitator rear.
In the flue gas emission control and recycling system of the coal-fired power plant, the dust remover is an electric dust remover or a bag dust remover or an electric bag dust remover.
Compared with the traditional ultralow emission process, the novel ultralow emission system provided by the invention can produce the following beneficial effects:
1) the smoke dust removing effect of 80-95% is realized before SCR, the abrasion and blockage of the smoke dust to an SCR catalyst and an air preheater are reduced, and meanwhile, the smoke dust collected at high temperature can be directly used as a chemical filling material and the like;
2) the activity of gaseous pollutants in the flue gas is enhanced by the preposed high-temperature electrostatic dust collector under the action of a strong electric field, and the denitration efficiency is improved by the auxiliary SCR;
3) the smoke dust amount in the smoke entering the SCR is greatly reduced, and the SCR can select a catalyst with higher hole number density, so that the integral denitration efficiency of the SCR reactor is improved;
4) the pressure difference between the SCR and the air pre-heater is stabilized, and the problem that the unit cannot run due to the pressure difference change of the SCR and the air pre-heater under the high-load condition is avoided;
5) the smoke and dust amount at the inlet of the dust remover at the rear end of the SCR is reduced, and the dust remover can more easily realize the ultralow emission index of smoke and dust;
6) effectively inhibiting ammonia escape;
7) the conventional electric precipitation ultralow emission is easy to realize, and a foundation is laid for the resource utilization of sulfur.
Drawings
FIG. 1 is a schematic diagram of a conventional ultra-low emission process.
FIG. 2 is a schematic view of the ultra low emission process of the present invention.
In the figure: the method comprises the following steps of 1-a boiler, 2-an SCR denitration device, 3-a dust remover, 4-a desulfurizing tower, 5-a chimney and 6-a high-temperature electrostatic dust remover.
Detailed Description
The purpose of the invention is realized by the following technical scheme:
1) for a newly-built coal-fired power plant, the overall design is carried out, an SCR denitration system is properly moved backwards, and a high-temperature electrostatic dust collector is additionally arranged;
2) for the improvement of an old power plant, a platform can be additionally arranged above the original dust remover, a high-temperature electrostatic dust remover is installed, and an SCR inlet flue is improved, so that the SCR reactor is positioned behind the high-temperature electrostatic dust remover.
The structure of the high-temperature electrostatic dust collector is basically consistent with that of the traditional electrostatic dust collector, and the high-temperature electrostatic dust collector needs to meet the requirement of normal operation in a high-temperature state and adopts a high-temperature resistant body material, an insulating material and a heat insulating material.
Claims (7)
1. Coal fired power plant flue gas emission control and resourceful system thereof, including SCR denitrification facility (2), dust remover (3) and desulfurizing tower (4), its characterized in that installs high temperature electrostatic precipitator (6) additional in the high temperature district before the SCR denitrification facility, coal fired power plant's flue gas passes through high temperature electrostatic precipitator (6), SCR denitrification facility (2), dust remover (3) and desulfurizing tower (4) in proper order.
2. The system for controlling flue gas emission and recycling of coal-fired power plants as recited in claim 1, wherein the high-temperature electrostatic precipitator (6) is a one-to-two electric field high-temperature electrostatic precipitator.
3. The coal fired power plant flue gas emission control and recycling system thereof as set forth in claim 1 or 2, wherein: the power supply of the high-temperature electrostatic dust collector (6) adopts a power frequency power supply, a high-frequency power supply, a three-phase power supply or a high-frequency pulse power supply.
4. The coal fired power plant flue gas emission control and its of claim 1 or 2The resource system is characterized in that the smoke emission of the system is lower than 5mg/m3。
5. The coal-fired power plant flue gas emission control and recycling system of claim 1 or 2, characterized in that the high-temperature electrostatic precipitator (6) is designed with a high-temperature resistant body, an insulating material and a heat preservation.
6. The system for controlling the emission of flue gas from a coal-fired power plant and recycling the flue gas into resources according to claim 1 or 2, wherein the overall design of a newly-built coal-fired power plant is carried out, the SCR denitration device (2) is moved backwards, and a high-temperature electrostatic dust collector (6) is additionally arranged in front of the SCR denitration device (2); for old power plant transformation, can install the platform additional in former dust remover (3) top, install high temperature electrostatic precipitator (6), reform transform SCR denitrification facility entry flue, make SCR denitrification facility be located high temperature electrostatic precipitator rear.
7. The coal-fired power plant flue gas emission control and recycling system thereof of claim 1 or 2, characterized in that the dust collector (3) is an electric dust collector or a bag dust collector or an electric bag dust collector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010855265.5A CN111871134A (en) | 2020-08-24 | 2020-08-24 | Flue gas emission control and recycling system of coal-fired power plant |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010855265.5A CN111871134A (en) | 2020-08-24 | 2020-08-24 | Flue gas emission control and recycling system of coal-fired power plant |
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| CN111871134A true CN111871134A (en) | 2020-11-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010855265.5A Pending CN111871134A (en) | 2020-08-24 | 2020-08-24 | Flue gas emission control and recycling system of coal-fired power plant |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113368674A (en) * | 2021-05-06 | 2021-09-10 | 华电电力科学研究院有限公司 | Denitration and dust removal combined system and method for coal-fired power plant |
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- 2020-08-24 CN CN202010855265.5A patent/CN111871134A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113368674A (en) * | 2021-05-06 | 2021-09-10 | 华电电力科学研究院有限公司 | Denitration and dust removal combined system and method for coal-fired power plant |
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