CN110559852A - Method for removing sulfur trioxide in flue gas - Google Patents
Method for removing sulfur trioxide in flue gas Download PDFInfo
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- CN110559852A CN110559852A CN201910945257.7A CN201910945257A CN110559852A CN 110559852 A CN110559852 A CN 110559852A CN 201910945257 A CN201910945257 A CN 201910945257A CN 110559852 A CN110559852 A CN 110559852A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D49/00—Separating dispersed particles from gases, air or vapours by other methods
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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
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
- B01D53/502—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific solution or suspension
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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
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
- B01D53/504—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound 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
- B01D53/77—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
- B01D53/86—Catalytic processes
- B01D53/8603—Removing sulfur compounds
- B01D53/8609—Sulfur oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/02—Plant or installations having external electricity supply
- B03C3/16—Plant or installations having external electricity supply wet type
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/30—Alkali metal compounds
- B01D2251/304—Alkali metal compounds of sodium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/30—Sulfur compounds
- B01D2257/302—Sulfur oxides
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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
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Abstract
The invention provides a method for removing sulfur trioxide in flue gas, which comprises the following steps: step 1, reacting flue gas containing sulfur trioxide with a sodium-based alkaline solution at an air inlet of an SCR reactor to remove sulfur trioxide in the flue gas to obtain flue gas A, allowing the flue gas A to enter the SCR reactor to react with a denitration catalyst to oxidize sulfur dioxide in the flue gas A into sulfur trioxide to obtain flue gas B, reacting the flue gas B with an absorbent at an air outlet of the SCR reactor to remove sulfur trioxide in the flue gas B to obtain flue gas C; step 2, enabling the flue gas C to enter a low-low temperature electric precipitator, and removing dust in the flue gas C to obtain flue gas D; step 3, enabling the flue gas D to enter a desulfurizing tower, and removing sulfur trioxide in the flue gas D to obtain flue gas E; and 4, enabling the flue gas E to enter a wet electrostatic dust collector to remove dust in the flue gas E, so that the method has the advantages of improving the removal rate of sulfur trioxide in the flue gas and effectively removing the content of the sulfur trioxide in the flue gas.
Description
Technical Field
The invention belongs to the technical field of thermal power generation, and particularly relates to a method for removing sulfur trioxide from flue gas.
background
At present, with the popularization of the ultra-low emission standard in the thermal power industry, more and more pollutant emissions of coal-fired power plants reach the ultra-low emission target. The ultra-low emission limit standards have indeed improved atmospheric environment for several years. However, the implementation of the ultra-low emission limit standard does not fundamentally eliminate haze, and particularly in winter, a part of areas can form haze with a certain scale under the condition of low environmental temperature and poor smoke diffusion condition, and the dispute of people, particularly the environmental protection boundary, on the haze cause is also triggered. Although experts say that for the reason of causing haze, the experts propose 32429that the particles PM2.5 which have the greatest influence on the human body in the haze are achieved, and the finer inhalable particles directly pass through alveoli and enter the blood of the human body, so that irreparable harm is caused to the human body. For the exhaust gas of a thermal power plant, PM2.5 mainly forms aerosol nuclei of secondary products such as sulfate and nitrate, which are generated by combining sulfur trioxide and NOx aerosol with metal particles in the atmosphere except smoke dust. At present, smoke dust and NOx of a thermal power plant are subjected to ultra-low or ultra-low emission, and sulfur trioxide emission control is urgent. Environmental protection authorities have focused on sulfur trioxide control, and the emission of sulfur trioxide is also subject to restrictions in future national standards. As the domestic pollutant emission standard has no limit on the emission requirement of sulfur trioxide, the domestic use of the method rarely has the special SO3Removal reports on the study. SO is carried out only in individual items in order to reduce the generation of sulfates such as ammonium bisulfate and the like in the SCR reactor and reduce the risk of blockage of the air preheater3Removal test and study.
The following table is a coal quality analysis table of design coal collected from 25% of national gutun coal mine, 25% of \37075;. city coal mine and 50% of Shenhua group stone coal mixed, and check coal collected from 30% of domestic Lingbao temple coal mine, 20% of Penzhuang coal mine, 25% of stone lake mine raw coal and 25% of poplar mine raw coal mixed:
SO at atmospheric pressure3Has a melting point of 16.8 ℃ and a boiling point of 44.8 ℃, and SO is contained in a flue3In the gaseous state if SO is directly introduced3Is discharged and SO3The smoke gas is very easy to absorb moisture to generate sulfuric acid, when the temperature of the smoke gas is lower than the dew point temperature of the sulfuric acid, the extremely fine sulfuric acid droplets can form sulfuric acid aerosol and sulfuric acid mist, and blue or yellow smoke plume can be caused. Particularly, in recent years, most domestic coal-fired units are provided with SCR denitration devices, and a small amount of SO is generated under the action of denitration catalysts2Is converted into SO by oxidation3，SO3The emission concentration of the SCR denitration device is increased compared with that before the SCR denitration device is not arranged. Environmental protection departments in Shanghai, Tianjin, Zhejiang and the like have issued local laws and regulations in succession, and require effective measures to be taken by coal-fired power plants to eliminate the phenomena of gypsum rain, colored smoke plume and the like. SO common at present3The removing device is provided with a low-low temperature electric dust remover, a desulfurizing tower and a wet electrostatic dust remover which are all opposite to SO3The removal of the (B) has a certain effect, and according to related literature reports and field test data, the low-temperature dust remover has SO3The removal efficiency of the desulfurizing tower is about 30 percent, and the desulfurizing tower is used for removing SO3The removal efficiency of the wet electrostatic dust collector is about 30 to 40 percent, and the wet electrostatic dust collector is used for removing SO3The removal efficiency is about 50 to 70 percent.
However, even if the low-temperature electric precipitator, the wet desulfurization device and the wet electrostatic precipitator are used in combination, the direct addition effect cannot be achieved, and the SO in the exhaust flue gas cannot be effectively removed3The experimental result shows that the total removal efficiency of the three combined use reaches about 70 to 80 percent, and SO is discharged3The concentration of (A) is 10-20mg/Nm3The results are still less than ideal.
Disclosure of Invention
The invention provides a method for removing sulfur trioxide in flue gas, which can effectively remove the sulfur trioxide in the flue gas.
The technical scheme of the invention is realized as follows: a method for removing sulfur trioxide in flue gas comprises the following steps:
Step 1, reacting flue gas containing sulfur trioxide with a sodium-based alkaline solution at an air inlet of an SCR reactor to remove sulfur trioxide in the flue gas to obtain flue gas A, allowing the flue gas A to enter the SCR reactor to react with a denitration catalyst to oxidize sulfur dioxide in the flue gas A into sulfur trioxide to obtain flue gas B, reacting the flue gas B with an absorbent at an air outlet of the SCR reactor to remove sulfur trioxide in the flue gas B to obtain flue gas C;
Step 2, enabling the flue gas C to enter a low-low temperature electric precipitator, and removing dust in the flue gas C to obtain flue gas D;
Step 3, enabling the flue gas D to enter a desulfurizing tower, and removing sulfur trioxide in the flue gas D to obtain flue gas E;
And 4, enabling the flue gas E to enter a wet electrostatic precipitator to remove dust in the flue gas E.
As a preferred embodiment, a first removal interface is arranged at an air inlet of the SCR reactor, an alkali liquor dilution device, a compressed air storage device and a first spray gun are arranged on one side of the SCR reactor, a first spray nozzle is arranged on the first spray gun, the first spray gun is communicated with the first spray nozzle, the first spray nozzle is fixedly arranged at the first removal interface, a first pipeline is arranged between the first spray gun and the alkali liquor dilution device in a communicating manner, a second pipeline is arranged between the first spray gun and the compressed air storage device in a communicating manner, and a metering and distributing device is arranged on the first pipeline and the second pipeline.
Before the flue gas carries out the denitration in getting into the SCR reactor, sodium-based alkaline solution carries out preliminary sulfur trioxide's of getting rid of operation to the flue gas before getting into the SCR reactor, because fine atomization is general atomizing relatively, atomizing is more abundant, so sodium-based alkaline solution after the fine atomization can be better with the sulfur trioxide in the flue gas take place the reaction, realize sulfur trioxide's preliminary desorption in the flue gas, the flue gas is after carrying out the denitration through the SCR reactor, carry out further sulfur trioxide's desorption via low-temperature electrostatic precipitator, desulfurizing tower and wet electrostatic precipitator, and simultaneously, the dust is carried out preliminary removal by low-temperature electrostatic precipitator, carry out further removal by wet electrostatic precipitator, the invention can improve sulfur trioxide's in the flue gas clearance, effectively get rid of sulfur trioxide's content in the flue gas.
as a preferred embodiment, the metering and distributing device comprises a pressure gauge, an alkali liquor flow meter, a solution regulating valve and a compressed air regulating valve, wherein the alkali liquor flow meter and the solution regulating valve are arranged on the first pipeline, and the pressure gauge and the compressed air regulating valve are arranged on the second pipeline.
the sodium-based alkaline solution is configured and diluted in the alkaline solution diluting device, and is delivered to the first spray gun through the first pipeline after being configured to proper concentration, and meanwhile, compressed air is delivered to the first spray gun through the second pipeline, and the sodium-based alkaline solution is atomized in the first spray gun and is sprayed out through the first nozzle to react with flue gas at an air inlet of the SCR reactor to remove sulfur trioxide in the flue gas.
The manometer is arranged in detecting the pressure value of compressed air in the second pipeline to through adjusting compressed air governing valve, adjust the compressed air in the second pipeline, the alkali lye flowmeter is arranged in detecting the flow of sodium-based alkaline solution in the first pipeline, and through adjusting solution governing valve, adjusts the velocity of flow of sodium-based alkaline solution in the first pipeline, is arranged in the meticulous degree of atomization of sodium-based alkaline solution in the better control first spray gun.
As a preferred embodiment, the sodium-based alkaline solution comprises one or more of sodium carbonate solution, sodium bicarbonate solution and sodium hydroxide solution.
As a preferred embodiment, the concentration of the sodium-based alkaline solution is 40% to 60%.
In a preferred embodiment, the first spray gun is a two-fluid spray gun.
As a preferred embodiment, a second removal interface is arranged at an air outlet of the SCR reactor, an absorbent storage device, a weightlessness type feeder and a second spray gun are arranged on one side of the SCR reactor, a second nozzle is arranged on the second spray gun, the second spray gun is communicated with the second nozzle, the second nozzle is fixedly arranged at the second removal interface, a third pipeline is communicated between the second spray gun and the absorbent storage device, the absorbent storage device is connected with the weightlessness type feeder, and an absorbent in the absorbent storage device is injected into the air outlet of the SCR reactor through the second nozzle.
In a preferred embodiment, one end of the third pipe is in communication with the second spray gun, the other end of the third pipe is in communication with a blower, and the absorbent storage device is disposed between the blower and the second spray gun.
because including the denitration catalyst in the SCR reactor, the denitration catalyst has very strong catalytic oxidation, make in the flue gas partly sulfur dioxide oxidation become sulfur trioxide, sulfur trioxide's concentration risees, so after passing through the SCR reactor, partly sulfur trioxide produces again, consequently the second nozzle that sets up at SCR reactor gas outlet department, can spout the absorbent into the gas outlet department of SCR reactor, carry out further getting rid of the sulfur trioxide in the flue gas that comes out by the SCR reactor, and simultaneously, weightless formula dispenser is used for controlling the speed of feed, make absorbent and flue gas reaction more abundant.
The blower blows the absorbent in the third pipeline into a second spray gun by means of air blowing, and the absorbent in the second spray gun is injected into the air outlet of the SCR reactor through a second nozzle.
As a preferred embodiment, the absorbent comprises one or more of calcium hydroxide, calcium oxide and calcium carbonate.
As a preferred embodiment, a flue gas detection device for detecting the flow rate of flue gas and the concentration of sulfur trioxide is arranged at the air inlet of the SCR reactor.
Flue gas detection device is arranged in detecting flue gas velocity of flow and sulfur trioxide concentration to according to the result that flue gas detection device detected, through the velocity of flow of compressed air in the compressed air governing valve adjustment second pipeline, through the velocity of flow of sodium-based alkaline solution in the solution control valve adjustment first pipeline, be arranged in guaranteeing the reaction degree of sulfur trioxide in the sodium-based alkaline solution after the meticulous atomizing and the flue gas.
After the technical scheme is adopted, the invention has the beneficial effects that:
1. Before the flue gas enters the SCR reactor for denitration, the sodium-based alkaline solution carries out preliminary sulfur trioxide removing operation on the flue gas before the flue gas enters the SCR reactor, fine atomization is more sufficient than general atomization, so the finely atomized sodium-based alkaline solution can better react with sulfur trioxide in the flue gas to realize preliminary removal of the sulfur trioxide in the flue gas, the flue gas is further removed through a low-low temperature electric dust remover, a desulfurizing tower and a wet electrostatic dust remover after being subjected to denitration by the SCR reactor, and a second spray gun is arranged at an air outlet of the SCR reactor to further remove the sulfur trioxide in the flue gas, meanwhile, dust is preliminarily removed through the low-low temperature electric dust remover, and the wet electrostatic dust remover further removes the sulfur trioxide in the flue gas, so the invention can improve the sulfur trioxide removing rate in the flue gas, the content of sulfur trioxide in the flue gas is effectively removed.
2. The inlet port department of SCR reactor is provided with the flue gas detection device who is used for detecting flue gas velocity of flow and sulfur trioxide concentration, flue gas detection device is used for detecting flue gas velocity of flow and sulfur trioxide concentration, and according to the result that flue gas detection device detected, the velocity of flow of compressed air in the second pipeline is adjusted through the compressed air governing valve, the velocity of flow of sodium-based alkaline solution in the first pipeline is adjusted through the solution governing valve, a meticulous degree of atomization for ensureing sodium-based alkaline solution, improve and sulfur trioxide's reaction degree in the flue gas.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of the present invention.
In the figure, 1-SCR reactor; 2-low temperature electric dust collector; 3-a desulfurizing tower; 4-wet electrostatic precipitator; 5-an alkali liquor diluting device; 6-compressed air storage device; 7-a first conduit; 8-a second conduit; 9-loss-in-weight feeder; 10-a blower; 11-an absorbent storage device; 12-third conduit.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, a method for removing sulfur trioxide from flue gas comprises the following steps:
step 1, reacting flue gas containing sulfur trioxide with a sodium-based alkaline solution at an air inlet of an SCR reactor 1 to remove sulfur trioxide in the flue gas to obtain flue gas A, allowing the flue gas A to enter the SCR reactor 1 to react with a denitration catalyst to oxidize the sulfur dioxide in the flue gas A into sulfur trioxide to obtain flue gas B, allowing the flue gas B to react with an absorbent at the air outlet of the SCR reactor 1 to remove the sulfur trioxide in the flue gas B to obtain flue gas C;
step 2, enabling the flue gas C to enter a low-low temperature electric dust remover 2, and removing dust in the flue gas C to obtain flue gas D;
Step 3, enabling the flue gas D to enter a desulfurizing tower 3, and removing sulfur trioxide in the flue gas D to obtain flue gas E;
and 4, enabling the flue gas E to enter a wet electrostatic dust collector 4, and removing dust in the flue gas E.
the air inlet department of SCR reactor 1 is provided with first desorption interface, one side of SCR reactor 1 is provided with alkali lye diluting device 5, compressed air storage device 6 and first spray gun, be provided with first nozzle on the first spray gun, first spray gun and first nozzle are linked together, first nozzle is fixed to be set up in first desorption kneck, the intercommunication is provided with first pipeline 7 between first spray gun and the alkali lye diluting device 5, the intercommunication is provided with second pipeline 8 between first spray gun and the compressed air storage device 6, be provided with the measurement distributor on first pipeline 7 and the second pipeline 8.
Before the flue gas carries out the denitration in getting into SCR reactor 1, sodium-based alkaline solution carries out preliminary sulfur trioxide's of getting rid of operation to the flue gas before getting into SCR reactor 1, because fine atomization is general atomizing relatively, atomizing is more abundant, so sodium-based alkaline solution after the fine atomization can be better with the sulfur trioxide in the flue gas take place the reaction, realize sulfur trioxide's preliminary desorption in the flue gas, the flue gas is after SCR reactor 1 carries out the denitration, carry out further sulfur trioxide's desorption through low temperature electrostatic precipitator 2, desulfurizing tower 3 and wet electrostatic precipitator 4, simultaneously, the dust is carried out preliminary removal by low temperature electrostatic precipitator 2, carry out further removal by wet electrostatic precipitator 4, the invention can improve sulfur trioxide's rate of removal in the flue gas, effectively get rid of sulfur trioxide's content in the flue gas.
One side of SCR reactor 1 is provided with controlling means, and sodium-based alkaline solution disposes in alkali lye diluting device 5 and dilutes, and after the configuration to suitable concentration, send to first spray gun through first pipeline 7 in, simultaneously, compressed air sends to first spray gun through second pipeline 8 in, and sodium-based alkaline solution atomizes in first spray gun to spout through first nozzle, and SCR reactor 1 gas inlet department's flue gas reaction, be used for getting rid of the sulfur trioxide in the flue gas.
The metering and distributing device comprises a pressure gauge, an alkali liquor flow meter, a solution regulating valve and a compressed air regulating valve, wherein the alkali liquor flow meter and the solution regulating valve are arranged on the first pipeline 7, and the pressure gauge and the compressed air regulating valve are arranged on the second pipeline 8. Manometer and controlling means electricity are connected, compressed air governing valve and controlling means electricity are connected, solution governing valve and controlling means electricity are connected, alkali lye flowmeter and controlling means electricity are connected, controlling means adopts CPU in this embodiment, the manometer is arranged in detecting compressed air's in the second pipeline 8 pressure value, and through adjusting compressed air governing valve, adjust the compressed air in the second pipeline 8, alkali lye flowmeter is arranged in detecting the flow of sodium-based alkaline solution in first pipeline 7, and through adjusting the solution governing valve, adjust the velocity of flow of sodium-based alkaline solution in first pipeline 7, a meticulous degree of atomization for sodium-based alkaline solution in the first spray gun of better control.
And a flue gas detection device for detecting the flow rate of flue gas and the concentration of sulfur trioxide is arranged at the air inlet of the SCR reactor 1. Used flue gas detection device is JH-60E in this embodiment, flue gas detection device and controlling means electricity are connected, flue gas detection device is used for detecting flue gas velocity of flow and sulfur trioxide concentration, and according to the result that flue gas detection device detected, give controlling means with the information transfer of result, controlling means passes through the velocity of flow of compressed air in compressed air governing valve adjustment second pipeline 8, adjust the velocity of flow of sodium-based alkaline solution in first pipeline 7 through the solution governing valve, a reaction degree for ensureing sulfur trioxide in the sodium-based alkaline solution after the meticulous atomizing and the flue gas.
the sodium-based alkaline solution comprises one or more of sodium carbonate solution, sodium bicarbonate solution and sodium hydroxide solution. The concentration of the sodium-based alkaline solution in the alkaline solution diluting device 5 is 40-60%.
A second removal interface is arranged at an air outlet of the SCR reactor 1, an absorbent storage device 11, a weightlessness type feeder 9 and a second spray gun are arranged on one side of the SCR reactor 1, a second nozzle is arranged on the second spray gun, the second spray gun and the second nozzle are communicated, the second nozzle is fixedly arranged at the second removal interface, a third pipeline 12 is communicated between the second spray gun and the absorbent storage device 11, the absorbent storage device 11 is connected with the weightlessness type feeder 9, and an absorbent in the absorbent storage device 11 is injected into the air outlet of the SCR reactor 1 through the second nozzle.
because including the denitration catalyst in the SCR reactor 1, the denitration catalyst has very strong catalytic oxidation, make in the flue gas partly sulfur dioxide oxidation become sulfur trioxide, sulfur trioxide's concentration risees, so after SCR reactor 1, partly sulfur trioxide generates again, consequently the second nozzle that sets up at SCR reactor 1 gas outlet department, can spout the absorbent into SCR reactor 1's gas outlet department, carry out further removal to the sulfur trioxide in the flue gas that comes out by SCR reactor 1, simultaneously, weightless formula dispenser 9 is used for controlling the speed of feed, make absorbent and flue gas reaction more abundant.
One end of the third pipeline 12 is communicated with the second spray gun, the other end of the third pipeline 12 is communicated with a blower 10, and an absorbent storage device 11 is arranged between the blower 10 and the second spray gun. The blower 10 blows the absorbent in the third pipe 12 into the second lance by means of air blowing, and the absorbent in the second lance is injected into the outlet of the SCR reactor 1 through the second nozzle. Wherein, the absorbent in the absorbent storage device 11 comprises one or more of calcium hydroxide, calcium oxide and calcium carbonate.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method for removing sulfur trioxide in flue gas is characterized by comprising the following steps:
Step 1, reacting flue gas containing sulfur trioxide with a sodium-based alkaline solution at an air inlet of an SCR reactor to remove sulfur trioxide in the flue gas to obtain flue gas A, allowing the flue gas A to enter the SCR reactor to react with a denitration catalyst to oxidize sulfur dioxide in the flue gas A into sulfur trioxide to obtain flue gas B, reacting the flue gas B with an absorbent at an air outlet of the SCR reactor to remove sulfur trioxide in the flue gas B to obtain flue gas C;
Step 2, enabling the flue gas C to enter a low-low temperature electric precipitator, and removing dust in the flue gas C to obtain flue gas D;
Step 3, enabling the flue gas D to enter a desulfurizing tower, and removing sulfur trioxide in the flue gas D to obtain flue gas E;
And 4, enabling the flue gas E to enter a wet electrostatic precipitator to remove dust in the flue gas E.
2. the method for removing sulfur trioxide from flue gas according to claim 1, wherein a first removal interface is arranged at an air inlet of the SCR reactor in step 1, an alkali dilution device, a compressed air storage device and a first spray gun are arranged on one side of the SCR reactor, a first spray nozzle is arranged on the first spray gun, the first spray gun is communicated with the first spray nozzle, the first spray nozzle is fixedly arranged at the first removal interface, a first pipeline is arranged between the first spray gun and the alkali dilution device in a communicating manner, a second pipeline is arranged between the first spray gun and the compressed air storage device in a communicating manner, and a metering and distributing device is arranged on the first pipeline and the second pipeline.
3. the method for removing sulfur trioxide from flue gas according to claim 2, wherein the metering and distributing device comprises a pressure gauge, an alkali liquid flow meter, a solution regulating valve and a compressed air regulating valve, wherein the alkali liquid flow meter and the solution regulating valve are arranged on the first pipeline, and the pressure gauge and the compressed air regulating valve are arranged on the second pipeline.
4. The method for removing sulfur trioxide from flue gas according to claim 1, wherein the sodium-based alkaline solution in step 1 comprises one or more of sodium carbonate solution, sodium bicarbonate solution and sodium hydroxide solution.
5. The method for removing sulfur trioxide from flue gas as recited in claim 4, wherein the concentration of the sodium-based alkaline solution is 40% -60%.
6. The method for removing sulfur trioxide from flue gas according to claim 2, characterized in that the first spray gun is a two-fluid spray gun.
7. The method for removing sulfur trioxide from flue gas according to claim 1, wherein a second removal interface is arranged at the gas outlet of the SCR reactor in step 1, an absorbent storage device, a weight-loss feeder and a second spray gun are arranged on one side of the SCR reactor, a second spray nozzle is arranged on the second spray gun, the second spray gun is communicated with the second spray nozzle, the second spray nozzle is fixedly arranged at the second removal interface, a third pipeline is arranged between the second spray gun and the absorbent storage device in a communication manner, the absorbent storage device is connected with the weight-loss feeder, and the absorbent in the absorbent storage device is injected into the gas outlet of the SCR reactor through the second spray nozzle.
8. the method for removing sulfur trioxide from flue gas as claimed in claim 7, characterized in that one end of the third pipeline is communicated with the second spray gun, the other end of the third pipeline is communicated with a blower, and the absorbent storage device is arranged between the blower and the second spray gun.
9. The method for removing sulfur trioxide from flue gas according to claim 1, wherein the absorbent comprises one or more of calcium hydroxide, calcium oxide and calcium carbonate.
10. The method for removing sulfur trioxide from flue gas according to claim 1, wherein a flue gas detection device for detecting the flow rate and the concentration of sulfur trioxide is arranged at the gas inlet of the SCR reactor in step 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910945257.7A CN110559852A (en) | 2019-09-30 | 2019-09-30 | Method for removing sulfur trioxide in flue gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910945257.7A CN110559852A (en) | 2019-09-30 | 2019-09-30 | Method for removing sulfur trioxide in flue gas |
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