Coal-fired flue gas carbon dioxide absorption device

Abstract

This invention belongs to the field of coal-fired flue gas treatment technology, specifically a carbon dioxide absorption device for coal-fired flue gas. The proposed solution includes a composite absorption tower, with a flue gas inlet pipe fixedly connected to the bottom circumference and a flue gas outlet pipe fixedly connected to the top. Inside the composite absorption tower, from bottom to top, are sequentially fixedly arranged a spray cooling mechanism, an organic amine primary absorption mechanism, a solid adsorption mechanism, and an organic amine reabsorption mechanism. In this invention, the solid adsorption mechanism, from bottom to top, includes a baffle hood, a vortex-shaped cooling pipe, a drying channel, a first adsorption channel, and a second adsorption channel. This reduces the flue gas temperature and maintains the internal temperature of the adsorption hood, allowing the fixed amine adsorbent material to fully absorb carbon dioxide from the flue gas in a low-temperature environment. This also allows the organic amine to reabsorb carbon dioxide in a low-temperature environment, optimizing and improving the adsorption of carbon dioxide by the organic amine, and extending the service life of the organic amine absorbent in the organic amine reabsorption mechanism.

Description

Technical Field

[0001] This invention relates to the field of coal-fired flue gas treatment technology, and in particular to a coal-fired flue gas carbon dioxide absorption device. Background Technology

[0002] Post-combustion carbon capture (PCC) typically removes carbon dioxide from flue gas after the combustion of fossil fuels or biomass, collecting carbon dioxide-containing flue gas from the exhaust emissions of conventional oil, coal, and natural gas power plants. The carbon dioxide in the flue gas is selectively captured and then pressurized through a compression unit before transportation, while the carbon dioxide-free flue gas is released into the atmosphere. PCC is currently the most widely used capture method. The recovery of carbon dioxide from flue gas is not only the most direct and effective means of mitigating the carbon dioxide emission crisis, but it can also reduce production costs.

[0003] Post-combustion carbon capture mainly includes chemical absorption, physical absorption, membrane separation, adsorption separation, and cryogenic separation. The appropriate technology depends on the characteristics of the flue gas. Chemical absorption is used for coal-fired flue gas. Chemical absorption utilizes the chemical reaction between carbon dioxide and an absorbent to separate carbon dioxide gas from the flue gas. Since carbon dioxide is a weak acid anhydride, weak base organic amine compounds are generally used as absorbents in chemical absorption. The principle is that a weak base (amine) and a weak acid (carbon dioxide) undergo a reversible reaction to produce a water-soluble salt.

[0004] To reduce the overall energy consumption of organic amine carbon capture, extend solvent life, enable organic amine carbon dioxide capture and absorption in a low-temperature environment, and optimize and improve the adsorption of carbon dioxide by organic amines, a carbon dioxide absorption device for coal-fired flue gas is proposed. Summary of the Invention

[0005] Based on the technical problems existing in the background technology, the present invention proposes a carbon dioxide absorption device for coal-fired flue gas.

[0006] This invention proposes a carbon dioxide absorption device for coal-fired flue gas, comprising a composite absorption tower. A flue gas inlet pipe is fixedly connected to the bottom circumference of the composite absorption tower, and a flue gas outlet pipe is fixedly connected to the top circumference. Inside the composite absorption tower, from bottom to top, are sequentially fixedly arranged a spray cooling mechanism, an organic amine primary absorption mechanism, a solid adsorption mechanism, and an organic amine re-absorption mechanism. The solid adsorption mechanism includes an adsorption hood. A support frame is fixedly installed at the bottom of the adsorption hood, and the circumference of the support frame is fixedly installed to the inner wall of the composite absorption tower. A vortex cooling pipe is fixedly installed inside the support frame. An inner nest is fixedly inserted into the middle of the adsorption hood, and a surrounding heat exchange tube is sleeved on the outer circumference of the inner nest. An isolation cover is sleeved on the outer side of the surrounding heat exchange tube. A second adsorption channel is formed between the isolation cover and the adsorption hood, a first adsorption channel is formed between the isolation cover and the surrounding heat exchange tube, and a drying channel is formed between the surrounding heat exchange tube and the inner nest. The first and second adsorption channels are filled with solid amine adsorbent material, and the drying channel is filled with activated alumina desiccant.

[0007] Preferably, a seawater inlet pipe is fixedly inserted into the lower circumference of the composite absorption tower, and the seawater inlet pipe is fixedly installed with the input end of the spray cooling mechanism. A rich liquid outlet pipe is fixedly connected to the lower middle circumference of the composite absorption tower, a lean liquid inlet pipe is fixedly installed in the middle circumference of the composite absorption tower, a spray re-inlet pipe is fixedly installed in the upper circumference of the composite absorption tower, and a slag discharge pipe is fixedly installed at the bottom of the composite absorption tower.

[0008] Preferably, a baffle is fixedly installed inside the composite absorption tower, and the baffle is located between the organic amine primary absorption mechanism and the solid adsorption mechanism.

[0009] Preferably, the flow deflector is composed of an outer mesh cover and an inner mesh cover fixedly connected, and the bottom ends of the outer mesh cover and the inner mesh cover are both semi-elliptical. The outer wall of the outer mesh cover is fixedly provided with multiple liquid accumulation ridges, and the liquid accumulation ridges are conical with a wider top and a narrower bottom.

[0010] Preferably, the inner mesh cover has an adsorption tank inside, and the adsorption tank is filled with activated carbon adsorbent. A bracket is fixedly installed at the top of the inner mesh cover, and a drainage fan is rotatably installed in the middle of the bracket.

[0011] Preferably, a cold source pipe is fixedly connected to one end of the vortex cooling pipe, a heat source pipe is fixedly connected to the bottom middle end of the vortex cooling pipe, and a cold source inlet and a heat source outlet are fixedly connected to the two outlet ends of the surrounding heat exchange pipe, respectively.

[0012] Preferably, the bottom end of the inner nest is fixedly installed to the top of the inner wall of the support frame, and the bottom end of the inner nest is fixedly installed to the bottom end of the isolation cover, and the inner nest is hollow.

[0013] Preferably, a reinforcing strip is fixedly provided at the top of the isolation cover, and the reinforcing strip is vortex-shaped.

[0014] Preferably, a turbulence component is fixedly installed in the middle of the inner nest, and multiple drying plates are fixedly installed on the inner circumference of the inner nest, and the turbulence component is a conical spiral blade that is wider at the top and narrower at the bottom.

[0015] The beneficial effects of this invention are as follows: 1. The present invention proposes a coal-fired flue gas carbon dioxide absorption device, which consists of a spray cooling mechanism, an organic amine primary absorption mechanism, a solid adsorption mechanism, and an organic amine reabsorption mechanism, which are fixedly arranged from bottom to top inside the composite absorption tower. This allows the flue gas to undergo water washing and cooling, primary absorption of carbon dioxide by organic amine, absorption of carbon dioxide by solid amine, and reabsorption of carbon dioxide by organic amine within the composite absorption tower, resulting in multiple absorption and capture of carbon dioxide in the flue gas. Furthermore, the solid adsorption mechanism, arranged from bottom to top, includes a baffle hood, a vortex-shaped cooling pipe, a drying channel, a first adsorption channel, and a second adsorption channel, which lowers the flue gas temperature and maintains the internal temperature of the adsorption hood. This allows the fixed amine adsorbent material to fully absorb carbon dioxide from the flue gas in a low-temperature environment, and also allows the organic amine reabsorption of carbon dioxide to occur in a low-temperature environment. This optimizes and enhances the adsorption of carbon dioxide by organic amine, significantly reducing the temperature of the exhaust gas at the top of the composite absorption tower, reducing water vapor content, reducing heat loss during absorption in the composite absorption tower, extending the service life of the organic amine absorbent in the organic amine reabsorption mechanism, and reducing the overall energy consumption of organic amine carbon capture.

[0016] 2. The present invention proposes a carbon dioxide absorption device for coal-fired flue gas. Multiple conical liquid accumulation ridges are fixedly installed at the bottom of the baffle hood, which helps to condense the organic amine absorbent entrained in the flue gas. An adsorption tank filled with activated carbon adsorbent is installed inside the upper part of the baffle hood, which can adsorb harmful gases in the flue gas and further adsorb the organic amine absorbent entrained in the flue gas. A flow guide fan is rotatably installed at the top of the baffle hood, which helps to introduce the flue gas into the inner nest. Because the inner nest is equipped with a turbulence component with conical spiral blades, and multiple drying plates are fixedly installed on the inner circumference of the inner nest, the flue gas diffuses into the inner nest circumference. The multiple drying plates further adsorb residual water vapor and organic amine absorbent in the flue gas. The flue gas passes through the solid amine adsorbent material inside the first and second adsorption channels at low temperature, allowing the fixed amine adsorbent material to fully absorb the carbon dioxide in the flue gas.

[0017] 3. The carbon dioxide absorption device for coal-fired flue gas proposed in this invention maintains a circulating flow of heat exchange fluid inside the vortex cooling tube and the surrounding heat exchange tube, which exchanges heat with the flue gas and keeps the solid amine adsorbent material inside the first adsorption channel and the second adsorption channel in a low-temperature environment. This allows the carbon dioxide in the flue gas to be fully absorbed by the solid amine adsorbent material under low-temperature conditions, which also helps to maintain the stability of the fixed amine adsorbent material and the organic amine absorbent entrained in the flue gas, and avoids their thermal decomposition, which would prevent them from being unable to efficiently absorb carbon dioxide. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a coal-fired flue gas carbon dioxide absorption device proposed in this invention; Figure 2 This is a side view of the composite absorption tower of a coal-fired flue gas carbon dioxide absorption device proposed in this invention. Figure 3 This is a schematic diagram of the baffle of a coal-fired flue gas carbon dioxide absorption device proposed in this invention; Figure 4 This is a bottom view of the baffle structure of a coal-fired flue gas carbon dioxide absorption device proposed in this invention. Figure 5 This is a schematic diagram of the adsorption hood of a coal-fired flue gas carbon dioxide absorption device proposed in this invention; Figure 6 This is a schematic diagram of the internal structure of the adsorption hood of a coal-fired flue gas carbon dioxide absorption device proposed in this invention. Figure 7 This is a schematic diagram of the structure of the isolation cover of the coal-fired flue gas carbon dioxide absorption device proposed in this invention; Figure 8 This is a bottom view schematic diagram of the nested structure within a coal-fired flue gas carbon dioxide absorption device proposed in this invention.

[0019] In the diagram: 1 Composite absorption tower, 2 Flue gas inlet pipe, 3 Flue gas outlet pipe, 4 Seawater inlet pipe, 5 Spray cooling mechanism, 6 Slag discharge pipe, 7 Lean liquor inlet pipe, 8 Lean liquor re-inlet pipe, 9 Rich liquor outlet pipe, 10 Baffle, 11 Outer mesh cover, 12 Liquid accumulation ridge, 13 Inner mesh cover, 14 Adsorption tank, 15 Support, 16 Drainage fan, 17 Support frame, 18 Vortex cooling pipe, 19 Heat source pipe, 20 Cold source pipe, 21 Adsorption cover, 22 Isolation cover, 23 Circular heat exchanger pipe, 24 Cold source inlet, 25 Heat source outlet, 26 Inner nest, 27 Reinforcing strip, 28 Turbulent flow component, 29 Drying plate, 30 Second adsorption channel, 31 First adsorption channel, 32 Drying channel. Detailed Implementation

[0020] Reference Figure 1-8A carbon dioxide absorption device for coal-fired flue gas includes a composite absorption tower 1. A flue gas inlet pipe 2 is fixedly connected to the bottom circumference of the composite absorption tower 1, and a flue gas outlet pipe 3 is fixedly connected to the top of the composite absorption tower 1. Inside the composite absorption tower 1, from bottom to top, a spray cooling mechanism 5, an organic amine primary absorption mechanism, a solid adsorption mechanism, and an organic amine re-absorption mechanism are fixedly arranged sequentially. The solid adsorption mechanism includes an adsorption hood 21. A support frame 17 is fixedly installed at the bottom of the adsorption hood 21, and the circumference of the support frame 17 is fixedly installed to the inner wall of the circumference of the composite absorption tower 1. A vortex cooling pipe 18 is fixedly arranged inside the support frame 17. The middle part of the adsorption hood 21 is solid. An inner nest 26 is inserted into the flue gas, and a surrounding heat exchange tube 23 is fitted around the outer circumference of the inner nest 26. An isolation cover 22 is fitted around the outer side of the surrounding heat exchange tube 23. The isolation cover 22 and the adsorption cover 21 are configured as a second adsorption channel 30. The isolation cover 22 and the surrounding heat exchange tube 23 are configured as a first adsorption channel 31. The surrounding heat exchange tube 23 and the inner nest 26 are configured as a drying channel 32. The first adsorption channel 31 and the second adsorption channel 30 are filled with solid amine adsorbent material. The drying channel 32 is filled with activated alumina desiccant, which can effectively adsorb water vapor and organic amine absorbents entrained in the flue gas.

[0021] In this invention, a seawater inlet pipe 4 is fixedly inserted into the lower circumference of the composite absorption tower 1, and the seawater inlet pipe 4 is fixedly installed with the input end of the spray cooling mechanism 5. A rich liquid outlet pipe 9 is fixedly connected to the lower middle circumference of the composite absorption tower 1, a lean liquid inlet pipe 7 is fixedly installed in the middle circumference of the composite absorption tower 1, a spray re-inlet pipe 8 is fixedly installed in the upper circumference of the composite absorption tower 1, and a slag discharge pipe 6 is fixedly installed at the bottom of the composite absorption tower 1. The spray cooling mechanism 5, the primary organic amine absorption mechanism, the solid adsorption mechanism, and the organic amine re-absorption mechanism are fixedly arranged sequentially from bottom to top inside the composite absorption tower 1. The washing tower is placed below the absorption tower, realizing a multi-tower integration. By performing simulations and hydraulic calculations, compared with the two-tower design, it can effectively reduce flue gas resistance, while reducing the footprint and initial investment costs of the project. Furthermore, by using seawater as circulating cooling water, the flue gas temperature is rapidly reduced, particulate matter in the flue gas is settled, and the use of freshwater resources is greatly reduced, thus lowering economic costs. During the carbon dioxide absorption and capture process, the organic amine absorbent absorbs carbon dioxide from the flue gas and becomes a rich liquid, which is discharged from the rich liquid outlet pipe 9. After heat exchange, it enters the desorption tower, where carbon dioxide in the rich liquid is desorbed and the organic amine absorbent is regenerated under certain temperature and pressure conditions to obtain a lean liquid. This lean liquid is then introduced through the lean liquid inlet pipe 7 and the lean liquid re-inlet pipe 8 and fully absorbed and reacted with the flue gas. The composite absorption tower 1 is fixedly installed with a baffle 10, which is located between the primary organic amine absorption mechanism and the solid adsorption mechanism. Multiple conical liquid accumulation ridges 12 are fixedly set at the bottom of the baffle 10, which helps to condense the organic amine absorbent entrained in the flue gas. The upper end of the baffle 10 is provided with an adsorption tank 14 filled with activated carbon adsorbent, which can adsorb harmful gases in the flue gas and further adsorb the organic amine absorbent entrained in the flue gas. The top of the baffle 10 is rotatably provided with a flow guide fan 16, which helps to introduce the flue gas into the inner nest 26. The flow deflector 10 is formed by a fixed connection of an outer mesh cover 11 and an inner mesh cover 13. The bottom ends of both the outer mesh cover 11 and the inner mesh cover 13 are semi-elliptical. Multiple liquid accumulation ridges 12 are fixedly provided on the outer wall of the outer mesh cover 11, and the liquid accumulation ridges 12 are tapered with a wider top and a narrower bottom. The inner mesh cover 13 is provided with an adsorption tank 14, and the adsorption tank 14 is filled with activated carbon adsorbent. A bracket 15 is fixedly installed at the top of the inner mesh cover 13, and a drainage fan 16 is rotatably installed in the middle of the bracket 15. One end of the vortex cooling tube 18 is fixedly connected to a cold source tube 20, and the bottom middle end of the vortex cooling tube 18 is fixedly connected to a heat source tube 19. The two outlet ends of the surrounding heat exchange tube 23 are respectively fixedly connected to a cold source inlet 24 and a heat source outlet 25. The heat exchange fluid inside the vortex cooling tube 18 and the surrounding heat exchange tube 23 are kept in circulation, which not only exchanges heat with the flue gas, but also keeps the solid amine adsorbent material inside the first adsorption channel 31 and the second adsorption channel 30 in a low-temperature environment. This allows carbon dioxide in the flue gas to be fully absorbed by the solid amine adsorbent material in the low-temperature environment, which helps to maintain the stability of the fixed amine adsorbent material and the organic amine absorbent entrained in the flue gas, and avoids its thermal decomposition and inability to efficiently absorb carbon dioxide. The bottom of the inner nest 26 is fixedly installed to the top of the inner wall of the support frame 17, and the bottom of the inner nest 26 is fixedly installed to the bottom of the isolation cover 22. The inner nest 26 is hollow, which facilitates the transmission of flue gas to the adsorption cover 21. A reinforcing strip 27 is fixedly installed at the top of the isolation cover 22. The reinforcing strip 27 is vortex-shaped, which helps to enhance the pressure resistance and deformation resistance of the isolation cover 22. It stably fills the solid amine adsorption material inside the first adsorption channel 31 and the second adsorption channel 30, and fully and evenly absorbs carbon dioxide in the flue gas, avoiding the occurrence of absorption dead zones. A turbulence element 28 is fixedly installed in the middle of the inner nest 26, and multiple drying plates 29 are fixedly installed on the inner circumference of the inner nest 26. The turbulence element 28 is a conical spiral blade that is wider at the top and narrower at the bottom. After the flue gas is introduced into the inner nest 26, due to the turbulence element 28 with conical spiral blades and the multiple drying plates 29 fixedly installed on the inner circumference of the inner nest 26, the flue gas diffuses around the inner nest 26. The multiple drying plates 29 further adsorb the residual water vapor and organic amine absorbent in the flue gas. The flue gas passes through the solid amine adsorbent material inside the first adsorption channel 31 and the second adsorption channel 30 in a low-temperature environment, so that the fixed amine adsorbent material can fully absorb the carbon dioxide in the flue gas. This can significantly reduce the temperature of the exhaust gas at the top of the composite absorption tower 1, reduce the water vapor content, reduce the heat loss of the composite absorption tower 1, and extend the service life of the organic amine absorbent in the organic amine reabsorption mechanism.

[0022] Working principle: The composite absorption tower 1 is equipped with a spray cooling mechanism 5, an organic amine primary absorption mechanism, a solid adsorption mechanism, and an organic amine reabsorption mechanism, which are fixedly installed from bottom to top inside the composite absorption tower 1. This allows the flue gas to pass through water washing and cooling, organic amine primary absorption of carbon dioxide, solid amine absorption of carbon dioxide, and organic amine reabsorption of carbon dioxide in the flue gas in sequence inside the composite absorption tower 1. This results in multiple absorption and capture of carbon dioxide in the flue gas. In addition, the solid adsorption mechanism is equipped with a baffle hood 10, a vortex cooling pipe 18, a drying channel 32, a first adsorption channel 31, and a second adsorption channel 30, which are installed from bottom to top. This reduces the flue gas temperature and maintains the internal temperature of the adsorption hood 21. This allows the fixed amine adsorbent material to fully absorb carbon dioxide in the flue gas in a low-temperature environment. It also allows the organic amine to reabsorb carbon dioxide in a low-temperature environment. This optimizes and improves the adsorption of carbon dioxide by organic amines. It can significantly reduce the temperature of the exhaust gas at the top of the composite absorption tower 1, reduce the water vapor content, reduce the heat loss of the composite absorption tower 1, extend the service life of the organic amine absorbent in the organic amine reabsorption mechanism, and reduce the overall energy consumption of organic amine carbon capture. Multiple conical liquid accumulation ridges 12 are fixedly installed at the bottom of the baffle 10, which helps to condense the organic amine absorbent entrained in the flue gas. The upper part of the baffle 10 is provided with an adsorption tank 14 filled with activated carbon adsorbent, which can adsorb harmful gases in the flue gas and further adsorb the organic amine absorbent entrained in the flue gas. The top of the baffle 10 is rotatably provided with a flow guide fan 16, which helps to introduce the flue gas into the inner nest 26. Since the inner nest 26 is provided with a turbulence component 28 with conical spiral blades, and multiple drying plates 29 are fixedly installed on the inner circumference of the inner nest 26, the flue gas diffuses into the circumference of the inner nest 26. The multiple drying plates 29 further adsorb the residual water vapor and organic amine absorbent in the flue gas. The flue gas passes through the solid amine adsorbent material inside the first adsorption channel 31 and the second adsorption channel 30 in a low temperature environment, so that the fixed amine adsorbent material can fully absorb the carbon dioxide in the flue gas. The heat exchange fluid inside the vortex cooling tube 18 and the surrounding heat exchange tube 23 is kept in circulation, exchanging heat with the flue gas and keeping the solid amine adsorbent material inside the first adsorption channel 31 and the second adsorption channel 30 in a low-temperature environment. This allows the carbon dioxide in the flue gas to be fully absorbed by the solid amine adsorbent material in a low-temperature environment, which helps to maintain the stability of the fixed amine adsorbent material and the organic amine absorbent entrained in the flue gas, and avoids its thermal decomposition, which would prevent it from being unable to efficiently absorb carbon dioxide.

[0023] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A carbon dioxide absorption device for coal-fired flue gas, comprising a composite absorption tower (1), wherein a flue gas inlet pipe (2) is fixedly connected to the bottom circumference of the composite absorption tower (1), and a flue gas outlet pipe (3) is fixedly connected to the top of the composite absorption tower (1), characterized in that, The composite absorption tower (1) is equipped with a spray cooling mechanism (5), an organic amine primary absorption mechanism, a solid adsorption mechanism, and an organic amine reabsorption mechanism, which are fixedly arranged from bottom to top inside the tower. The solid adsorption mechanism includes an adsorption hood (21). A support frame (17) is fixedly installed at the bottom of the adsorption hood (21). The circumference of the support frame (17) is fixedly installed with the inner wall of the circumference of the composite absorption tower (1). A vortex cooling pipe (18) is fixedly arranged inside the support frame (17). An inner nest (26) is fixedly inserted in the middle of the adsorption hood (21). A circumferential cooling pipe (28) is sleeved on the outer side of the inner nest (26). The heat exchange tube (23) is surrounded by an isolation cover (22), and the isolation cover (22) and the adsorption cover (21) are configured as a second adsorption channel (30), the isolation cover (22) and the surrounding heat exchange tube (23) are configured as a first adsorption channel (31), the surrounding heat exchange tube (23) and the inner nest (26) are configured as a drying channel (32), the first adsorption channel (31) and the second adsorption channel (30) are filled with solid amine adsorption material, and the drying channel (32) is filled with activated alumina desiccant.

2. The carbon dioxide absorption device for coal-fired flue gas according to claim 1, characterized in that, The composite absorption tower (1) is fixedly connected to a seawater inlet pipe (4) at the lower circumference, and the seawater inlet pipe (4) is fixedly installed to the input end of the spray cooling mechanism (5). The composite absorption tower (1) is fixedly connected to a rich liquid outlet pipe (9) at the lower middle circumference, a lean liquid inlet pipe (7) is fixedly installed at the middle circumference, a spray re-inlet pipe (8) is fixedly installed at the upper circumference, and a slag discharge pipe (6) is fixedly installed at the bottom of the composite absorption tower (1).

3. The carbon dioxide absorption device for coal-fired flue gas according to claim 1, characterized in that, The composite absorption tower (1) is fixedly installed with a baffle (10), and the baffle (10) is located between the organic amine primary absorption mechanism and the solid adsorption mechanism.

4. The carbon dioxide absorption device for coal-fired flue gas according to claim 3, characterized in that, The baffle (10) is formed by a fixed connection of an outer mesh cover (11) and an inner mesh cover (13), and the bottom ends of the outer mesh cover (11) and the inner mesh cover (13) are both semi-elliptical. The outer wall of the outer mesh cover (11) is fixedly provided with multiple liquid accumulation ridges (12), and the liquid accumulation ridges (12) are tapered with a wider top and a narrower bottom.

5. A carbon dioxide absorption device for coal-fired flue gas according to claim 4, characterized in that, The inner mesh cover (13) is provided with an adsorption tank (14), and the adsorption tank (14) is filled with activated carbon adsorbent. A bracket (15) is fixedly installed at the top of the inner mesh cover (13), and a drainage fan (16) is rotatably installed in the middle of the bracket (15).

6. The carbon dioxide absorption device for coal-fired flue gas according to claim 1, characterized in that, One end of the vortex cooling tube (18) is fixedly connected to a cold source tube (20), and the bottom middle end of the vortex cooling tube (18) is fixedly connected to a heat source tube (19). The two outlet ends of the surrounding heat exchange tube (23) are respectively fixedly connected to a cold source inlet (24) and a heat source outlet (25).

7. The carbon dioxide absorption device for coal-fired flue gas according to claim 1, characterized in that, The bottom of the inner nest (26) is fixedly installed to the top of the inner wall of the bracket (17), and the bottom of the inner nest (26) is fixedly installed to the bottom of the isolation cover (22). The inner nest (26) is hollow.

8. The carbon dioxide absorption device for coal-fired flue gas according to claim 1, characterized in that, The top of the isolation cover (22) is fixedly provided with a reinforcing strip (27), and the reinforcing strip (27) is vortex-shaped.

9. A carbon dioxide absorption device for coal-fired flue gas according to claim 1, characterized in that, The inner nest (26) has a turbulence component (28) fixedly installed in the middle, and multiple drying plates (29) are fixedly installed on the inner circumference of the inner nest (26). The turbulence component (28) is a conical spiral blade that is wider at the top and narrower at the bottom.

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