CN111036072A - Flue gas treatment system - Google Patents
Flue gas treatment system Download PDFInfo
- Publication number
- CN111036072A CN111036072A CN201911284808.6A CN201911284808A CN111036072A CN 111036072 A CN111036072 A CN 111036072A CN 201911284808 A CN201911284808 A CN 201911284808A CN 111036072 A CN111036072 A CN 111036072A
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- Prior art keywords
- flue gas
- reaction
- heat exchange
- desulfurization
- mixed
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed 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
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- 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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- 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 provides a flue gas treatment system which comprises a desulfurization system, a dust removal system, a heat exchange system, a mixed heating system, a reaction system, a wind power system and a master control system, wherein the reaction system is also connected with an ammonia spraying system, the reaction system is also connected with the heat exchange system, and the desulfurization system, the dust removal system, the heat exchange system, the mixed heating system, the reaction system and the wind power system are all connected with the master control system. Compared with the prior art, the method is suitable for the ultralow emission control of NOx in low-temperature flue gas such as sintering flue gas. Under a low-temperature environment, 90-95% of denitration efficiency can be stably realized, and the oxidation rate of SO2 in the flue gas is lower than 1%; the catalytic temperature is only over 170 ℃, and the comprehensive energy consumption is low; the dust content in the flue gas is low, and the denitration reaction process is strengthened; the escape concentration of ammonia is low and is less than or equal to 3 ppm; the whole set of system reasonably and comprehensively arranges denitration, desulfurization and dust removal, and has good stability.
Description
Technical Field
The invention belongs to the technical field of flue gas treatment, and relates to a flue gas treatment system.
Background
With the enhancement of environmental awareness of people and the strict supervision of metal smelting exhaust gas by the nation, the development of the technology for desulfurization, denitrification and dioxin removal becomes more important. At present, the method generally adopted at home and abroad can only be used for single desulfurization, denitration and dioxin removal, or simultaneous desulfurization and denitration, but can not be used for removing three substances simultaneously.
At present, the main method for industrial desulfurization is lime-limestone desulfurization, wherein absorbent powder is prepared into slurry, and SO2 in flue gas is absorbed in an absorption tower. Wet desulfurization produces large amounts of wastewater, requiring the addition of wastewater treatment systems. The operation cost is high, the occupied area is large, the system management operation is complex, and the abrasion and corrosion phenomena are serious. And the byproducts generated by desulfurization are piled in large quantities due to low quality and limited market space, thereby causing secondary pollution to the environment.
At present, the main method for denitration in the market is a Selective Catalytic Reduction (SCR) method, and under the action of a catalyst, ammonia gas introduced into a reactor reacts in preference to NOx in flue gas in the presence of oxygen gas to generate N2 and H2O which are pollution-free to the environment. The SCR technology has high denitration efficiency and mature technology, but has higher operation cost. And because of the existence of the catalyst, SO2 in the flue gas is easily oxidized to generate SO3, and the SO3 reacts with excessive ammonia gas to generate ammonium bisulfate, SO that equipment is corroded.
At present, the removal of dioxin in flue gas mainly adopts activated carbon adsorption and flue gas quenching technology. The activated carbon only transfers the dioxin from the flue gas to the activated carbon, and the dioxin cannot be removed fundamentally. The flue gas quenching technology is used for rapidly reducing the temperature of flue gas from 800 ℃ to below 200 ℃ so as to avoid the generation of dioxin. For example, chinese patent application No. 201220444793.2 discloses a device for suppressing generation of dioxin in incineration flue gas, which is configured to cool high-temperature flue gas from an incinerator to a middle-temperature section by a waste heat recovery method in a safe temperature range in which dioxin is not generated, and then perform rapid cooling in a sensitive temperature region where dioxin is generated, thereby ensuring that the content of dioxin in the discharged incineration flue gas is greatly lower than a control index specified by national standards. The method causes a great deal of resource waste and can not realize desulfurization and denitrification simultaneously
Disclosure of Invention
The invention aims to provide a flue gas treatment system, which solves the problem that the desulfurization and the denitration can not be simultaneously carried out in the flue gas treatment process in the prior art.
The technical scheme adopted by the invention is that,
the utility model provides a flue gas treatment system, includes desulfurization system, dust pelletizing system, heat transfer system, hybrid heating system, reaction system and wind power system, still is connected with on the reaction system and spouts the ammonia system, and reaction system still is connected with heat transfer system.
The desulfurization system is used for removing sulfur dioxide in the flue gas to be treated and transmitting the treated flue gas to the dust removal system.
The dust removal system is used for filtering fine smoke dust in the smoke and transmitting the filtered smoke to the heat exchange system.
The heat exchange system is used for heating the flue gas, and the flue gas is transmitted to the mixed heating system after being heated to more than 100 ℃.
The mixed heating system comprises a coal gas inlet system, and is used for mixing and heating flue gas and coal gas to above 170 ℃, and then transmitting the mixed gas to the reaction system for reaction treatment.
The catalyst is placed in the reaction system, the reaction system is used for removing the nitrate component in the mixed gas, receiving the ammonia water in the ammonia spraying system, and removing the nitrate component in the mixed gas by utilizing the ammonia water to react with the mixed gas.
And the wind power system is used for blowing the treated gas into the chimney and discharging the treated gas from the chimney.
Compared with the prior art, the invention is suitable for the ultra-low emission treatment of NOx in low-temperature flue gas such as sintering flue gas and the like. Under a low-temperature environment, 90-95% of denitration efficiency can be stably realized, and the oxidation rate of SO2 in the flue gas is lower than 1%; the catalytic temperature is only over 170 ℃, and the comprehensive energy consumption is low; the dust content in the flue gas is low, and the denitration reaction process is strengthened; the escape concentration of ammonia is low and is less than or equal to 3 ppm; the whole set of system reasonably and comprehensively arranges denitration, desulfurization and dust removal, and has good stability.
Detailed Description
The present invention will be described in detail with reference to the following embodiments.
The invention provides a flue gas treatment system which comprises a desulfurization system, a dust removal system, a heat exchange system, a mixed heating system, a reaction system, a wind power system and a master control system, wherein the reaction system is also connected with an ammonia spraying system, the reaction system is also connected with the heat exchange system, the desulfurization system, the dust removal system, the heat exchange system, the mixed heating system, the reaction system and the wind power system are all connected with the master control system, and the master control system is used for respectively monitoring the working conditions of the desulfurization system, the dust removal system, the heat exchange system, the mixed heating system, the reaction system and the wind power system and sending control signals to the desulfurization system, the dust removal system, the heat exchange system, the mixed heating system, the reaction system and the wind power system.
The flue gas firstly enters a desulfurization system, the desulfurization system is used for removing sulfur dioxide in the flue gas to be treated, the master control system monitors the sulfur content of the flue gas in the desulfurization system, when the desulfurization system removes the sulfur dioxide in the flue gas to reach the emission standard, the master control system controls to send a control signal to the desulfurization system, the desulfurization system transmits the treated flue gas to a dust removal system, and the dust removal system removes dust from the flue gas.
The flue gas after desulfurization treatment contains a large amount of fine dust, the fine dust contains a large amount of heavy metals, the dust removal system is used for filtering fine dust in the flue gas, the heavy metals in the fine dust are absorbed, the master control system monitors the dust content and the heavy metal content of the flue gas in the dust removal system in real time, when the dust content and the heavy metal content in the flue gas in the dust removal system reach the emission standard, the master control system sends a control signal to the dust removal system, and the filtered flue gas is transmitted to the heat exchange system by the dust removal system.
The heat exchange system is used for heating the flue gas, the master control system monitors the temperature of the flue gas in the heat exchange system in real time, and when the temperature of the flue gas reaches over 100 ℃, the master control system sends a control signal to the heat exchange system to control the heat exchange system to transmit the flue gas to the mixed heating system.
The mixed heating system comprises a gas inlet system, gas to be purified enters the mixed heating system through the gas inlet system, the mixed heating system performs mixed heating on flue gas and the gas, the master control system monitors the temperature of the gas and the flue gas in the mixed heating system in real time, when the temperature of the gas and the flue gas reaches above 170 ℃, the master control system sends a control signal to the mixed heating system, and the mixed heating system transmits the mixed gas to the reaction system for reaction treatment.
The reaction system is used for receiving the ammonia water sprayed by the ammonia spraying system, the ammonia water is used for reacting with mixed gas to remove nitrate components in the mixed gas, the master control system monitors the content of the nitrate in the mixed gas in real time, when the content of the nitrate in the mixed gas reaches a discharge standard, the master control system sends a control signal to the reaction system, the reaction system transmits the mixed gas to the wind power system, and the wind power system is used for blowing the treated gas into a chimney and discharging the gas from the chimney.
Claims (7)
1. The flue gas treatment system is characterized by comprising a desulfurization system, a dust removal system, a heat exchange system, a mixed heating system, a reaction system and a wind power system, wherein the reaction system is also connected with an ammonia spraying system, and the reaction system is also connected with the heat exchange system.
2. The flue gas treatment system of claim 1, wherein the desulfurization system is configured to remove sulfur dioxide from the flue gas to be treated and to deliver the treated flue gas to the dedusting system.
3. The flue gas treatment system of claim 1, wherein the dust removal system is configured to filter fine dust in the flue gas and deliver the filtered flue gas to the heat exchange system.
4. The flue gas treatment system of claim 1, wherein the heat exchange system is configured to heat flue gas to a temperature above 100 ℃ and then deliver the flue gas to the hybrid heating system.
5. The flue gas treatment system of claim 1, wherein the mixed heating system comprises a gas inlet system, and the mixed heating system is used for mixing and heating flue gas and gas, and after heating to above 170 ℃, the mixed gas is conveyed to the reaction system for reaction treatment.
6. The flue gas treatment system of claim 1, wherein a catalyst is disposed in the reaction system, and the reaction system is configured to remove a nitrate component in the mixed gas, receive the ammonia water in the ammonia injection system, and remove the nitrate component in the mixed gas by reacting the ammonia water with the mixed gas.
7. A flue gas treatment system as claimed in claim 1, wherein the wind system is adapted to blow treated gases into and out of a stack.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911284808.6A CN111036072A (en) | 2019-12-13 | 2019-12-13 | Flue gas treatment system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911284808.6A CN111036072A (en) | 2019-12-13 | 2019-12-13 | Flue gas treatment system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111036072A true CN111036072A (en) | 2020-04-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911284808.6A Pending CN111036072A (en) | 2019-12-13 | 2019-12-13 | Flue gas treatment system |
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| CN (1) | CN111036072A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104162352A (en) * | 2014-04-25 | 2014-11-26 | 南京中电环保科技有限公司 | Glass kiln flue gas de-dusting, denitrification and desulfurization integral treatment process |
| CN205517257U (en) * | 2016-01-29 | 2016-08-31 | 北京龙源环保工程有限公司 | Ash -laden gas SCR denitrification facility hangs down in thermal power plant |
| CN107029531A (en) * | 2017-05-12 | 2017-08-11 | 安徽晨晰洁净科技有限公司 | The desulfurization of industrial smoke, dedusting denitrification integral handling process |
| CN108187489A (en) * | 2018-01-23 | 2018-06-22 | 杭州致蓝环保科技有限公司 | A kind of coke oven desulphurization denitration dust removal integrated plant |
| CN207805381U (en) * | 2017-12-30 | 2018-09-04 | 杭州致蓝环保科技有限公司 | A kind of low-temperature denitration device |
| MX2017008446A (en) * | 2017-05-25 | 2019-02-08 | Jiangnan Environmental Prot Group Inc | Method and apparatus for denitration and desulfurization of and dust removal from fcc tail gas by ammonia-based process. |
| CN109381990A (en) * | 2018-10-17 | 2019-02-26 | 北京国电龙源环保工程有限公司 | A kind of steel sintering flue gas denitrification system and the method for denitration using system progress |
| KR102005978B1 (en) * | 2019-02-14 | 2019-10-01 | (주)오앤엠 코리아 | Energy saving type hybrid torrefaction facility |
| CN209564842U (en) * | 2018-11-15 | 2019-11-01 | 安徽威达环保科技股份有限公司 | A kind of collaboration of sintering flue gas SCR denitration takes off white device |
-
2019
- 2019-12-13 CN CN201911284808.6A patent/CN111036072A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104162352A (en) * | 2014-04-25 | 2014-11-26 | 南京中电环保科技有限公司 | Glass kiln flue gas de-dusting, denitrification and desulfurization integral treatment process |
| CN205517257U (en) * | 2016-01-29 | 2016-08-31 | 北京龙源环保工程有限公司 | Ash -laden gas SCR denitrification facility hangs down in thermal power plant |
| CN107029531A (en) * | 2017-05-12 | 2017-08-11 | 安徽晨晰洁净科技有限公司 | The desulfurization of industrial smoke, dedusting denitrification integral handling process |
| MX2017008446A (en) * | 2017-05-25 | 2019-02-08 | Jiangnan Environmental Prot Group Inc | Method and apparatus for denitration and desulfurization of and dust removal from fcc tail gas by ammonia-based process. |
| CN207805381U (en) * | 2017-12-30 | 2018-09-04 | 杭州致蓝环保科技有限公司 | A kind of low-temperature denitration device |
| CN108187489A (en) * | 2018-01-23 | 2018-06-22 | 杭州致蓝环保科技有限公司 | A kind of coke oven desulphurization denitration dust removal integrated plant |
| CN109381990A (en) * | 2018-10-17 | 2019-02-26 | 北京国电龙源环保工程有限公司 | A kind of steel sintering flue gas denitrification system and the method for denitration using system progress |
| CN209564842U (en) * | 2018-11-15 | 2019-11-01 | 安徽威达环保科技股份有限公司 | A kind of collaboration of sintering flue gas SCR denitration takes off white device |
| KR102005978B1 (en) * | 2019-02-14 | 2019-10-01 | (주)오앤엠 코리아 | Energy saving type hybrid torrefaction facility |
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Application publication date: 20200421 |