CN112844025A - Tail flue gas carbon treatment device of thermal power plant - Google Patents
Tail flue gas carbon treatment device of thermal power plant Download PDFInfo
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- CN112844025A CN112844025A CN202110065915.0A CN202110065915A CN112844025A CN 112844025 A CN112844025 A CN 112844025A CN 202110065915 A CN202110065915 A CN 202110065915A CN 112844025 A CN112844025 A CN 112844025A
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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
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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
- B01D53/62—Carbon oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2256/00—Main component in the product gas stream after treatment
- B01D2256/22—Carbon dioxide
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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
- B01D2257/50—Carbon oxides
- B01D2257/504—Carbon dioxide
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/40—Capture or disposal of greenhouse gases of CO2
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Abstract
The invention relates to a tail flue gas carbon treatment device of a thermal power plant, which comprises a flue gas desulfurization device, wherein a gas outlet of the flue gas desulfurization device is connected with a gas inlet of a primary carbon dioxide gravity separator, a gas outlet at the upper part of the side wall of the primary carbon dioxide gravity separator is connected with a gas inlet at one side of a secondary carbon dioxide gravity separator, two gas outlets are arranged on the side wall of a carbon dioxide gas storage tank, one of the two gas outlets is connected to a carbon dioxide purification device, the other gas outlet is connected to the bottom of a carbon capture reactor, a water inlet of the carbon capture reactor is connected to a water outlet at the lower part of a lime water clarification tank, a water outlet of the carbon capture reactor is connected with a water inlet of a sedimentation tank, a discharge. The tail flue gas carbon treatment device of the thermal power plant performs gravity separation on carbon dioxide in flue gas, and stores and utilizes the separated carbon dioxide.
Description
Technical Field
The invention relates to the field of energy conservation and emission reduction of a flue gas system of a thermal power plant, and mainly aims at a tail flue gas carbon treatment device behind a desulfurization system of the thermal power plant.
Background
Carbon dioxide is taken as an important factor causing global warming, researches on the property and emission reduction technology of the carbon dioxide increasingly arouse the attention of experts and scholars, in China, the emission of the carbon dioxide mainly comes from the combustion of fossil fuels of factories and enterprises, the national requirement on environmental protection is strict, the emission of carbon dioxide gas of the factories and the enterprises is strictly limited and required, the carbon emission is an important energy-saving and environment-friendly index, and how to reduce the carbon emission of the factories and the enterprises through the energy-saving and pollution-reducing technology becomes one of the most urgently solved environmental protection projects.
As a main using unit of fossil fuel, under the strong promotion of China, flue gas at the tail part of a boiler has great progress on the treatment of dust, sulfide and nitric oxide, but the carbon capture process of the thermal power plant is starting at present, and the emission and utilization of carbon dioxide also need to be improved.
Disclosure of Invention
In view of the above situation, an object of the present invention is to provide a tail flue gas carbon treatment apparatus for a thermal power plant, which uses the difference in unit mass density of carbon dioxide in air to perform gravity separation on carbon dioxide in flue gas, and stores and utilizes the separated carbon dioxide to obtain a byproduct.
The technical scheme of the invention is as follows: a tail flue gas carbon treatment device of a thermal power plant comprises a flue gas desulfurization device, a primary carbon dioxide gravity separator, a secondary carbon dioxide gravity separator, a carbon dioxide gas storage tank, a carbon capture reactor, a sedimentation tank, a dehydration device and a carbon dioxide purification device;
the gas outlet of the flue gas desulfurization device is connected with the gas inlet of a primary carbon dioxide gravity separator, the primary carbon dioxide gravity separator is a trapezoid body, one side surface of the trapezoid body is an inclined surface, the inclined surface of the trapezoid body is installed downwards, the inclined surface is arranged in a downward inclined manner, the gas inlet is arranged at the upper end of the side wall, a precipitate outlet is arranged at the bottom of the other side wall opposite to the gas inlet, the side wall at the upper part of the precipitate outlet is provided with a carbon dioxide outlet which is connected to a carbon dioxide gas storage tank through a Roots blower, a plurality of vertical baffles which are staggered up and down are arranged at intervals at the upper end inside the primary carbon dioxide gravity separator, a plurality of transverse baffles are arranged at intervals along the gas flow direction at the upper part of the carbon dioxide outlet, the gas outlet at the, the gas outlet at the top of the device is connected to a chimney, the gas outlet at the lower part of the side wall at the other side is connected to a carbon dioxide gas storage tank through a Roots blower, the upper part of the side wall of a precipitate outlet is provided with a carbon dioxide outlet, a plurality of baffle plates which are arranged in a Z shape are arranged from the upper part of a gas inlet inside the secondary carbon dioxide gravity separator to the upper part of the carbon dioxide outlet at intervals, the gas outlet at the top of the secondary carbon dioxide gravity separator is connected to the chimney, the side wall of the carbon dioxide gas storage tank is provided with two gas outlets, one of the two gas outlets is connected to a carbon dioxide purification device, the other gas outlet is connected to the bottom of a carbon capture reactor through the Roots blower, the water inlet of the carbon capture, the bottom discharge hole of the sedimentation tank is connected with the feed inlet of the dewatering device, two baffles are arranged inside the sedimentation tank in a vertically staggered mode at intervals, the water outlet in the upper portion of the dewatering device is connected to the lime water clarification tank, and the sediment outlet is formed in the lower portion of the sedimentation tank.
Preferably, the tail flue gas carbon treatment device of the thermal power plant further comprises a lime water sedimentation tank, a lime water tank and a lime milk preparation bin, lime milk prepared from limestone and water is placed in the lime milk preparation bin, a water outlet at the upper part of the lime milk preparation bin is connected to a water inlet of the lime water tank, a water outlet of the lime water tank is connected to a water inlet of the lime water sedimentation tank, and a water outlet of the lime water sedimentation tank is connected to a water inlet of the lime water clarification tank.
Preferably, the user comprises factories for preparing fertilizers, fire extinguishing equipment, dry ice and refrigerants and also comprises green plants which are used as raw materials for photosynthesis.
The tail flue gas carbon treatment device of the thermal power plant utilizes the different unit mass densities of carbon dioxide in air to carry out gravity separation on the carbon dioxide of the flue gas of the thermal power plant, and the flue gas is introduced into a flue gas desulfurization device to remove dust, denitrate and desulfurize, and then mainly comprises the following components: nitrogen, oxygen, carbon dioxide, etc., the densities of these components being: the air density is: 1.293g/l, nitrogen density 1.25g/l, carbon dioxide density: 1.997g/l, oxygen density: 1.43 g/l. The utility model discloses this application utilizes each composition density difference of flue gas, through increase extension through-flow path reduction flue gas velocity of flow area in inferior, secondary gravity separator, makes carbon dioxide gas deposit in inferior, secondary gravity separator lower part, carries to the carbon dioxide gas holder through the fan respectively.
Carbon dioxide gas in a carbon dioxide gas storage tank is conveyed to a carbon capture reactor through a Roots blower, calcium hydroxide in the clarified lime water in the carbon capture reactor reacts with carbon dioxide to generate calcium carbonate, the calcium carbonate is a water-insoluble precipitate, the clarified lime water with the calcium carbonate is precipitated in a sedimentation tank, and the precipitated calcium carbonate enters a dehydration device to dehydrate and separate the precipitated calcium carbonate to obtain a calcium carbonate byproduct, wherein the calcium carbonate is an industrial and building raw material.
The carbon dioxide gas in the carbon dioxide gas storage tank is purified by a carbon dioxide purification device to obtain high-purity carbon dioxide gas which can be used as fertilizer, refrigerant, fire extinguishing material, dry ice and raw material for plant photosynthesis.
The tail flue gas carbon treatment device of the thermal power plant has the beneficial effects that:
1. the equipment has low production cost, simple structure and easy implementation;
2. the prepared carbon dioxide with higher purity can be prepared into byproducts for utilization;
3. energy conservation and emission reduction, reduces the emission of carbon dioxide in the flue gas of enterprises, and meets the environmental protection index.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of the connection between the primary carbon dioxide gravity separator and the secondary carbon dioxide gravity separator according to the present invention;
FIG. 3 is a schematic view of the configuration of the carbon capture reactor and the settling tank connection according to the present invention;
in the figure: 1-a flue gas desulfurization unit; 2-primary carbon dioxide gravity separator; 3-a secondary carbon dioxide gravity separator; 4-a chimney; 5-a carbon dioxide gas storage tank; 6-a carbon dioxide purification device; 7-carbon dioxide user; 8-a carbon capture reactor; 9-a sedimentation tank; 10-a dewatering device; 11-a limewater clarifier; 12-Roots blower; 13-a lime water sedimentation tank; 14-lime water pool; 15-lime milk preparing bin; 16-baffle.
Detailed Description
The technical scheme of the tail flue gas carbon treatment device of the thermal power plant is further described in detail with reference to the accompanying drawings:
as shown in fig. 1 to 3, a tail flue gas carbon treatment device of a thermal power plant comprises a flue gas desulfurization device 1, a primary carbon dioxide gravity separator 2, a secondary carbon dioxide gravity separator 3, a carbon dioxide gas storage tank 5, a carbon capture reactor 8, a sedimentation tank 9, a dehydration device 10 and a carbon dioxide purification device 6;
the gas outlet of the flue gas desulfurization device 1 is connected with the gas inlet of a primary carbon dioxide gravity separator 2, the primary carbon dioxide gravity separator 2 is a trapezoid body with one side surface being an inclined surface, the inclined surface of the trapezoid body is installed downwards, the inclined surface is arranged in a downward inclined manner, the gas inlet is arranged at the upper end of the side wall, a precipitate outlet is arranged at the bottom of the other side wall opposite to the gas inlet, the side wall at the upper part of the precipitate outlet is provided with a carbon dioxide outlet which is connected to a carbon dioxide gas storage tank 5 through a Roots blower 12, a plurality of vertical baffles 16 which are staggered up and down are arranged at intervals at the upper end inside the primary carbon dioxide gravity separator 2, a plurality of transverse baffles 16 are arranged at intervals along the gas flow direction at the upper part of the carbon dioxide outlet, the gas outlet at the upper part of the, the gas outlet at the top of the device is connected to a chimney 4, the gas outlet at the lower part of the side wall at the other side is connected to a carbon dioxide gas storage tank 5 through a Roots blower 12, the upper part of the outlet of the sediment at the side wall is provided with a carbon dioxide outlet, a plurality of baffles 16 which are arranged in a Z shape are arranged from the upper part of the gas inlet to the upper part of the carbon dioxide outlet in the secondary carbon dioxide gravity separator 3 at intervals, the gas outlet at the top of the secondary carbon dioxide gravity separator 3 is connected to the chimney 4, the side wall of the carbon dioxide gas storage tank 5 is provided with two gas outlets, one of the two gas outlets is connected to a carbon dioxide purifying device 6, the other gas outlet is connected to the bottom of a carbon capture reactor 8 through the Roots blower 12, the carbon dioxide user 7 comprises plants for preparing fertilizers, fire extinguishing equipment, dry ice and refrigerants and also comprises green plants, the green plants are used as raw materials for photosynthesis, a water outlet of the carbon capture reactor 8 is connected with a water inlet of the sedimentation tank 9, a bottom discharge hole of the sedimentation tank 9 is connected with a feed inlet of the dewatering device 10, two baffles 16 are arranged inside the sedimentation tank 9 in a vertically staggered mode at intervals, a water outlet in the upper portion of the dewatering device 10 is connected to the lime water clarification tank 11, and a sediment outlet is formed in the lower portion of the dewatering device 10.
Further, the tail flue gas carbon treatment device of the thermal power plant further comprises a lime water sedimentation tank 13, a lime water tank 14 and a lime milk preparation bin 15, lime milk prepared from limestone and water is placed in the lime milk preparation bin 15, a water outlet at the upper part of the lime milk preparation bin 15 is connected to a water inlet of the lime water tank 14, a water outlet of the lime water tank 14 is connected with a water inlet of the lime water sedimentation tank 13, and a water outlet of the lime water sedimentation tank 13 is connected with a water inlet of the lime water clarification tank 11.
In specific implementation, the flue gas at the outlet of the desulfurization device 1 enters a primary gravity separator 2, a plurality of vertical baffles 16 are arranged at the upper end in the primary gravity separator 2 at intervals in a staggered manner, a plurality of transverse baffles 16 are arranged at the upper part of a carbon dioxide outlet at intervals along the airflow direction, and the structure of a trapezoidal body increases the flow area and prolongs the flow path so as to reduce the flow velocity of the flue gas, so that carbon dioxide has time to deposit at the bottom of the primary carbon dioxide gravity separator 2, the flue gas from which part of the carbon dioxide is separated by the primary carbon dioxide gravity separator 2 enters a secondary carbon dioxide gravity separator 3, the secondary carbon dioxide gravity separator 3 again deposits and separates the flue gas, a plurality of baffles 16 arranged in a Z shape are arranged at intervals from the upper part of an air inlet to the upper part of the carbon dioxide outlet in the secondary carbon dioxide gravity separator 3, more carbon dioxide is deposited at the bottom of the secondary carbon dioxide gravity separator 3, the carbon dioxide deposited by the primary carbon dioxide gravity separator 2 and the secondary carbon dioxide gravity separator 3 is conveyed to a carbon dioxide gas storage tank 5 through a Roots blower 12, the residual flue gas of the secondary carbon dioxide gravity separator 3 enters a chimney 4, the carbon dioxide gas storage tank 5 is provided with two outlets, one outlet is connected to a carbon dioxide purification device 6, and the high-purity carbon dioxide of the carbon dioxide purification device 6 can be used as: the fertilizer, green plant is as raw materials of photosynthesis, fire extinguishing apparatus, by-products such as dry ice, refrigerant, two routes export is connected to the air inlet of carbon dioxide catcher 8 bottom, carbon dioxide and the clarification lime wash that lime wash clarifier 11 flowed in flow out after reacting, there is carbon dioxide and calcium hydroxide reaction to produce calcium carbonate in the clarification lime wash that flows out, calcium carbonate is dehydrated and separated through dewatering device 10 after deposiing in sedimentation tank 9 and is got dry calcium carbonate, baffle 16 that sets up crisscross from top to bottom in sedimentation tank 9 reduces the velocity of water, can make the maximum precipitation of calcium carbonate, by-product calcium carbonate can become an industrial raw materials.
The lime and water enter a lime milk preparation bin 15, the lime milk and water enter a lime water tank 14, lime water in the lime water tank 14 flows into a lime water sedimentation tank 13, clarified lime water flows into a lime water clarification tank 11, and the other path of inlet water in the lime water clarification tank 11 is clarified lime water separated by calcium carbonate.
Claims (3)
1. A tail flue gas carbon treatment device of a thermal power plant is characterized by comprising a flue gas desulfurization device, a primary carbon dioxide gravity separator, a secondary carbon dioxide gravity separator, a carbon dioxide gas storage tank, a carbon capture reactor, a sedimentation tank, a dehydration device and a carbon dioxide purification device;
the gas outlet of the flue gas desulfurization device is connected with the gas inlet of a primary carbon dioxide gravity separator, the primary carbon dioxide gravity separator is a trapezoid body, one side surface of the trapezoid body is an inclined surface, the inclined surface of the trapezoid body is installed downwards, the inclined surface is arranged in a downward inclined manner, the gas inlet is arranged at the upper end of the side wall, a precipitate outlet is arranged at the bottom of the other side wall opposite to the gas inlet, the side wall at the upper part of the precipitate outlet is provided with a carbon dioxide outlet which is connected to a carbon dioxide gas storage tank through a Roots blower, a plurality of vertical baffles which are staggered up and down are arranged at intervals at the upper end inside the primary carbon dioxide gravity separator, a plurality of transverse baffles are arranged at intervals along the gas flow direction at the upper part of the carbon dioxide outlet, the gas outlet at the, the gas outlet at the top of the device is connected to a chimney, the gas outlet at the lower part of the side wall at the other side is connected to a carbon dioxide gas storage tank through a Roots blower, the upper part of the side wall of a precipitate outlet is provided with a carbon dioxide outlet, a plurality of baffle plates which are arranged in a Z shape are arranged from the upper part of a gas inlet inside the secondary carbon dioxide gravity separator to the upper part of the carbon dioxide outlet at intervals, the gas outlet at the top of the secondary carbon dioxide gravity separator is connected to the chimney, the side wall of the carbon dioxide gas storage tank is provided with two gas outlets, one of the two gas outlets is connected to a carbon dioxide purification device, the other gas outlet is connected to the bottom of a carbon capture reactor through the Roots blower, the water inlet of the carbon capture, the bottom discharge hole of the sedimentation tank is connected with the feed inlet of the dewatering device, two baffles are arranged inside the sedimentation tank in a vertically staggered mode at intervals, the water outlet in the upper portion of the dewatering device is connected to the lime water clarification tank, and the sediment outlet is formed in the lower portion of the sedimentation tank.
2. The thermal power plant tail flue gas carbon treatment device according to claim 1, further comprising a lime water sedimentation tank, a lime water tank and a lime milk preparation bin, wherein lime milk prepared from limestone and water is placed in the lime milk preparation bin, a water outlet at the upper part of the lime milk preparation bin is connected to a water inlet of the lime water tank, a water outlet of the lime water tank is connected to a water inlet of the lime water sedimentation tank, and a water outlet of the lime water sedimentation tank is connected to a water inlet of the lime water clarification tank.
3. The tail flue gas carbon treatment device of the thermal power plant as claimed in claim 1, wherein the user comprises a factory for preparing chemical fertilizer, fire extinguishing equipment, dry ice and refrigerant, and also comprises green plants as raw materials for photosynthesis.
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| CN202110065915.0A CN112844025A (en) | 2021-01-19 | 2021-01-19 | Tail flue gas carbon treatment device of thermal power plant |
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| CN202110065915.0A CN112844025A (en) | 2021-01-19 | 2021-01-19 | Tail flue gas carbon treatment device of thermal power plant |
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Application publication date: 20210528 |