Recovery method and system and activated carbon concentration apparatus for post-capture decarburized gas

Abstract

Disclosed in the present disclosure are a recovery method and system and activated carbon concentration apparatus for a post-capture decarburized gas. The apparatus is used for recovering a decarburized gas output from a carbon capture absorption tower. The apparatus comprises: at least two chambers, wherein each chamber contains activated carbon, and each chamber controls the flow direction of the decarburized gas by means of a respective gas inlet valve; an activated carbon adsorption efficiency determination unit, used for determining the adsorption efficiency of the activated carbon in each chamber; and a gas inlet valve controller, used for controlling, when the adsorption efficiency of the activated carbon in each chamber is lower than a predetermined value, the gas inlet valve of the chamber to be closed and to open the gas inlet valve of the other chamber, so that the activated carbon in the other chamber adsorbs the decarburized gas. The present disclosure can reduce resource waste and reduce the pollution probability.

Description

Method and system for recovering decarbonized gas after capture and activated carbon concentration device

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This disclosure is based on and claims the priority of Chinese patent application with application number 202410121981.9 and application date January 29, 2024. The entire content of the Chinese patent application is hereby incorporated into this application by reference. Technical Field

[0003] The present disclosure relates to the technical field of greenhouse gas emission reduction and resource utilization, and in particular to a method and system for recovering captured decarbonized gas and an activated carbon concentration device. Background Art

[0004] Currently, the energy sector accounts for 68% of greenhouse gas emissions, 90% of which are carbon dioxide (CO2). Among the many sources of CO2 emissions, CO2 from coal and oil combustion is the primary global source. With the rise of non-industrial countries, the proportion of CO2 emissions from coal combustion has risen to the top of all emission sources. The power sector contributes significantly to CO2 emissions, accounting for 45% of the nation's total. In response to rising greenhouse gas emissions, my country has developed a number of carbon reduction policies and targeted technical measures, such as pre-combustion capture, oxygen-enriched combustion, and post-combustion capture. Post-combustion capture is one of the most mature technologies, with demonstration projects already established in hundreds of regions around the world and ongoing process improvements and optimization.

[0005] A common capture process uses an organic amine solution, which is highly selective for CO2, for absorption, followed by heating and regeneration, to generate high-purity CO2 for storage. In this process, the flue gas, after absorption by the organic solvent, is discharged through the top of the absorption tower. The remaining gas components primarily include VOCs (volatile organic compounds), organic amines volatilized from the absorbent, a small amount of uncaptured CO2, and moisture.

[0006] The residual gas discharged contains not only harmful substances, but also recyclable organic amines, CO2 gas and water, etc. Directly discharging the residual gas into the atmosphere will not only waste resources, but also cause secondary pollution to the air. Summary of the Invention

[0007] The present disclosure provides a method and system for recovering decarbonized gas after capture, and an activated carbon concentration device to solve at least one of the above-mentioned problems.

[0008] According to a first aspect of the present disclosure, there is provided an activated carbon concentration device for captured decarbonized gas, which recycles and processes the decarbonized gas output from a carbon capture absorption tower, and comprises: at least two compartments, each compartment containing activated carbon, and each compartment controlling the flow direction of the decarbonized gas through its own air intake valve; an activated carbon adsorption efficiency determination unit for determining the adsorption efficiency of the activated carbon in each compartment; and an air intake valve controller for controlling the air intake valve of the compartment to close and the air intake valve of another compartment to open when the adsorption efficiency of the activated carbon in the compartment is lower than a predetermined value, so that the activated carbon in the other compartment can adsorb the decarbonized gas.

[0009] Furthermore, each compartment inputs high-temperature steam into the reboiler through its own steam input valve. The device also includes: a steam input valve controller, which is used to control the steam input valve of the compartment to open after the air inlet valve of the compartment is closed, so that the high-temperature steam of the reboiler can enter the compartment and desorb the gas adsorbed by the activated carbon in the compartment.

[0010] Furthermore, the device also includes: a reflux pipe for returning the desorbed gas to the desorption tower in the form of steam.

[0011] Optionally, the device also includes: an air supply fan, a three-ventilation valve and a burner, wherein: after the air inlet valve of the cabin is closed, the remaining gas in the cabin after activated carbon adsorption is input into the burner through the air supply fan and the three-ventilation valve.

[0012] According to a second aspect of the present disclosure, a recovery system for decarbonized gas after capture is provided, the system comprising: the above-mentioned activated carbon concentration device for decarbonized gas after capture, a carbon capture absorption tower, a reboiler and a desorption tower, wherein the desorption tower desorbs the carbon dioxide entering from the carbon capture absorption tower through the heating treatment of the reboiler.

[0013] Optionally, the desorption tower recovers the desorption-treated gas output from the activated carbon concentration device and refluxed in the form of steam, and performs a temperature-raising operation based on the heat of the steam.

[0014] According to a third aspect of the present disclosure, a method for recovering decarbonized gas after capture is provided, the method comprising: providing at least two chambers, each chamber containing activated carbon, wherein the chambers are connected to a carbon capture absorption tower, and the chambers control the flow direction of the decarbonized gas output from the carbon capture absorption tower through their own air intake valves; in response to the decarbonized gas entering the chamber, determining the adsorption efficiency of the activated carbon in the chamber; when the adsorption efficiency of the activated carbon in the chamber is lower than a predetermined value, controlling the air intake valve of the chamber to close and opening the air intake valve of another chamber to facilitate the activated carbon in the other chamber to adsorb the decarbonized gas.

[0015] Furthermore, the method also includes: each compartment inputs high-temperature steam into the reboiler through its own steam input valve; after the air inlet valve of the compartment is closed, the steam input valve of the compartment is controlled to open so that the high-temperature steam from the reboiler enters the compartment to desorb the gas adsorbed by the activated carbon in the compartment.

[0016] Optionally, the method further comprises: returning the desorbed gas to the desorption tower in the form of steam.

[0017] Optionally, the method further includes: pre-setting an air supply fan, a three-ventilation valve and a burner; after the air inlet valve of the cabin is closed, the remaining gas in the cabin after activated carbon adsorption is input into the burner through the air supply fan and the three-ventilation valve.

[0018] At the same time, the present disclosure also provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the above method is implemented when the processor executes the computer program.

[0019] At the same time, the present disclosure also provides a computer-readable storage medium, which stores a computer program for executing the above method.

[0020] It can be seen from the above technical solution that this technical solution can realize the adsorption and desorption treatment of decarbonized gas by setting up a cabin containing activated carbon, thereby realizing the recycling of decarbonized gas, thereby reducing resource waste and reducing the probability of pollution.

[0021] In order to make the above and other purposes, features and advantages of the present disclosure more obvious and easy to understand, the following embodiments are given in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] FIG1 is a schematic diagram of a system for recovering captured decarbonized gas according to an embodiment of the present disclosure.

[0023] FIG2 is a structural block diagram of an activated carbon concentration device for capturing decarbonized gas according to an embodiment of the present disclosure.

[0024] FIG3 is a flow chart of a method for recovering captured decarbonized gas according to an embodiment of the present disclosure.

[0025] Reference numerals:

[0026] Carbon capture absorption tower 1, rich liquid pump 2, lean and rich liquid heat exchanger 3, lean liquid pump 4, desorption tower 5, reboiler 6, compartment 7, air intake control valve 8, steam desorption control valve 9, air supply fan 10, three-ventilation valve 11, burner 12, post-combustion capture device 13, activated carbon concentration device 14, activated carbon adsorption efficiency determination unit 142, air intake valve controller 143. DETAILED DESCRIPTION

[0027] The following will be combined with the accompanying drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the embodiments described are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present disclosure.

[0028] In related technologies, the residual gas (also known as decarbonized gas) discharged from the absorption tower contains not only harmful substances but also reusable organic amines, CO2 gas, and water. If the residual gas is directly discharged into the atmosphere, it will not only waste resources but also cause secondary air pollution.

[0029] Based on this, the embodiment of the present disclosure provides a recovery scheme for the decarbonized gas after capture. On the one hand, this scheme can recycle and reuse the gas components in the decarbonized gas, reduce resource waste, and reduce the probability of pollution; on the other hand, the heat recovered from the desorption steam can be used to heat the desorption tower, which can reduce the energy consumption of the reboiler.

[0030] The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

[0031] FIG1 is a schematic diagram of a post-capture decarbonized gas recovery system according to an embodiment of the present disclosure. As shown in FIG1 , the system includes a post-combustion capture device 13 and an activated carbon concentration device 14 for the post-capture decarbonized gas. The activated carbon concentration device 14 recovers the decarbonized gas captured by the post-combustion capture device 13.

[0032] FIG2 is a block diagram of the structure of the activated carbon concentration device 14. As shown in FIG2, the activated carbon concentration device 14 includes: at least two compartments 7, an activated carbon adsorption efficiency determination unit 142 and an intake valve controller 143, wherein:

[0033] Each compartment contains activated carbon, which can absorb decarbonized gas. Each compartment controls the flow direction of the decarbonized gas through its own air inlet valve.

[0034] The activated carbon adsorption efficiency determination unit 142 is used to determine the adsorption efficiency of the activated carbon in each compartment.

[0035] In actual operation, the activated carbon adsorption efficiency determination unit 142 can be two gas analyzers set at the inlet and outlet of the cabin, used to measure the concentration of gases (for example, CO and CO2) and determine the adsorption efficiency of the activated carbon in the cabin based on the concentration difference between the inlet and outlet gases.

[0036] The air intake valve controller 143 is used to control the air intake valve of the compartment to close and the air intake valve of another compartment to open when the adsorption efficiency of the activated carbon in the compartment is lower than a predetermined value (the predetermined value can be determined according to actual conditions and is not limited in the present disclosure), so that the activated carbon in the other compartment can adsorb the decarbonized gas.

[0037] Furthermore, each compartment can also receive high-temperature steam from the reboiler via its own steam input valve. Accordingly, the activated carbon concentrator 14 further includes a steam input valve controller configured to control the opening of the steam input valve in a compartment after the compartment's air inlet valve is closed, thereby allowing the high-temperature steam from the reboiler to enter the compartment and desorb the gas adsorbed by the activated carbon in the compartment.

[0038] In practice, the activated carbon concentrator 14 also includes a reflux line for returning the desorbed gas to the desorption tower in the form of steam. The desorbed gas primarily includes reusable organic amines and CO2. The desorption tower then recycles these gases.

[0039] In one embodiment, the activated carbon concentrator 14 further includes an air supply blower, a three-way ventilation valve, and a burner. After the air inlet valve of the chamber is closed, the remaining gas in the chamber after activated carbon adsorption is fed into the burner through the air supply blower and the three-way ventilation valve. This remaining gas is clean air and can be fed into the burner for further use.

[0040] In order to better understand the present disclosure, the working principle of the recycling system is described in detail below with reference to FIG1 .

[0041] Continuing to refer to Figure 1, the post-combustion capture device 13 includes: a carbon capture absorption tower 1, a rich liquid pump 2, a lean and rich liquid heat exchanger 3, a lean liquid pump 4, a desorption tower 5 and a reboiler 6; the activated carbon concentration device 14 includes: a cabin 7, an air intake control valve 8, a steam desorption control valve 9, an air supply fan 10, a three-ventilation valve 11 and a burner 12.

[0042] During operation of the recovery system, the desorption tower 5 desorbs carbon dioxide entering the carbon capture and absorption tower 1 through heating by the reboiler 6. The decarbonized gas from the carbon capture and absorption tower 1 enters the activated carbon concentrator 14 for adsorption and desorption. Subsequently, the desorption tower 5 recovers the desorbed gas, which is refluxed in the form of steam from the chamber 7 of the activated carbon concentrator 14, and heats the desorbed gas using the heat of the steam.

[0043] By using the activated carbon concentrator 14 to adsorb and desorb the decarbonized gas, and the desorption tower 5 to recover the desorbed gas, the gas components in the decarbonized gas can be recycled and reused, reducing resource waste and lowering the probability of pollution. Furthermore, the desorption tower 5 uses steam heat to increase the temperature, which can reduce the energy consumption of the reboiler.

[0044] In actual operation, after the flue gas from the power plant is discharged from the combustion furnace, it undergoes desulfurization, denitrification and dust removal pretreatment and then enters the carbon capture absorption tower 1. It fully contacts the carbon capture solvent lean liquid from bottom to top. The carbon dioxide in the flue gas is absorbed by the lean liquid (the lean liquid is produced by the lean liquid pump 4) and then falls to the bottom of the tower under the action of gravity. Under the power of the rich liquid pump 2, it enters the lean-rich liquid heat exchanger 3 for sufficient heat exchange with the hot lean liquid. After pre-heating, the solution enters the carbon dioxide desorption tower 5. Under the action of the reboiler 6, it is heated and the carbon dioxide and part of the water vapor are desorbed. It is discharged from the top of the desorption tower 5 and enters the condenser for subsequent treatment. The decarbonized gas generated in the absorption tower 1 enters the cabin 7 of the activated carbon concentration device from the top of the absorption tower 1 through the air intake control valve 8 (which has the function of the above-mentioned air intake valve controller). The porous structure and good adsorption performance of the activated carbon in the cabin absorb the incompletely absorbed carbon dioxide gas, carbon monoxide gas and other components in the decarbonized gas. Afterwards, the adsorbed clean air is controlled by the air supply fan 10 and the three-way ventilation valve 11, with part of it being fed into the boiler burner 12 and part of it being discharged normally.

[0045] The aforementioned chamber 7 has a two- or multi-chamber structure. When the air inlet valve of one chamber is open, that chamber performs flue gas adsorption. Subsequently, based on the gas analysis data at the chamber inlet and outlet, the concentrations of carbon monoxide (CO) and carbon dioxide (CO2) are measured to determine the activated carbon adsorption efficiency. Specifically, two gas analyzers can be installed at the inlet and outlet of chamber 7 to measure CO and CO2 concentrations. The difference in gas concentrations at the inlet and outlet can be used to determine the activated carbon adsorption efficiency within the chamber.

[0046] After a period of adsorption, when the adsorption efficiency drops to 50% to 60%, the air inlet valve of the compartment is closed, and the air inlet valve of the other compartment is opened to continue the gas adsorption work. At the same time, the remaining steam from the reboiler 6 is introduced into the compartment through the steam desorption control valve 9 via the insulation pipeline, and the gas components in the activated carbon pores are desorbed and regenerated with high-temperature steam. The steam carrying carbon dioxide after stripping and the water liquid falling back to the bottom of the cabin enter the desorption tower 5 through the pipeline (i.e., the above-mentioned reflux pipe). When the activated carbon in the compartment is desorbed and the activated carbon adsorption efficiency of the other compartment approaches 50% to 60%, the air inlet valve of the other compartment is closed, and the air inlet valve of the compartment is opened, and the cycle is repeated to maintain the synchronous adsorption and desorption work of multiple compartments. In this way, the efficiency of decarbonized gas recovery and treatment can be improved.

[0047] In actual operation, the air intake valve and the steam desorption control valve may be electrically operated, and the opening and closing of the valves may be manually controlled by an electric valve PLC (Programmable Logic Controller).

[0048] In actual operation, the activated carbon concentration device 14 can be set up with 2 to N compartments according to the actual scenario. The gas flow direction between the multiple compartments is controlled by valves, and the multiple compartments work synchronously by adopting the method of partitioned adsorption and partitioned desorption. There is no risk of suspending the equipment operation for desorption, which can ensure work efficiency.

[0049] The disclosed embodiments replace the traditional water scrubber treatment process for decarbonized tail gas (i.e., decarbonized gas) with activated carbon adsorption and concentration, efficiently recovering and separating unabsorbed carbon dioxide, escaped organic amine absorbent, and water from the decarbonized tail gas, thereby reducing waste of effective resources and water and electricity consumption in the water scrubbing process. Furthermore, by utilizing the activated carbon's efficient capture of organic matter and absorbing other gaseous components in the tail gas, secondary air pollution caused by direct discharge can be prevented.

[0050] In addition, the embodiment of the present disclosure makes full use of the residual steam heat from steam regeneration after carbon dioxide capture to perform heated steam desorption and regeneration on the gas molecules adsorbed in the activated carbon pores, thereby restoring the adsorption performance of the activated carbon. At the same time, high-temperature steam is used to recover the CO2, organic amines and other components adsorbed in the pores in the form of steam and reflux them into the desorption tower. This will not generate excess waste liquid and reduce the cost of secondary treatment of wastewater and waste.

[0051] That is to say, the embodiment of the present disclosure refluxes the desorbed liquid from the activated carbon concentration device. On the one hand, the organic amine effective components volatilized in the decarbonized gas can be recovered and reused, and the carbon dioxide in the steam enters the next condensation section for storage as the temperature of the desorption tower rises. On the other hand, the heat of the recovered desorbed steam can be used to heat the desorption tower and reduce the energy consumption of the reboiler. At the same time, the reflux water and steam can realize the water replenishment function of the recovery system to maintain the high capture efficiency of the carbon capture solution.

[0052] Based on a similar concept, an embodiment of the present disclosure further provides a method for recovering decarbonized gas after capture, which method can optionally be applied to the above-mentioned recovery system.

[0053] FIG3 is a flow chart of the method for recovering the captured decarbonized gas. As shown in FIG3 , the method includes:

[0054] Step 301: providing at least two chambers, each chamber containing activated carbon, wherein each chamber is connected to a carbon capture and absorption tower, and each chamber controls the flow direction of decarbonized gas output from the carbon capture and absorption tower via its own air inlet valve;

[0055] Step 302, in response to the decarbonized gas entering the chamber, determining the adsorption efficiency of the activated carbon in the chamber;

[0056] Step 303: When the adsorption efficiency of the activated carbon in the compartment is lower than a predetermined value, the air intake valve of the compartment is controlled to close and the air intake valve of another compartment is opened, so that the activated carbon in the other compartment can adsorb the decarbonized gas.

[0057] Furthermore, the above method also includes: each compartment inputs high-temperature steam into the reboiler through its own steam input valve; after the air inlet valve of the compartment is closed, the steam input valve of the compartment is controlled to open so that the high-temperature steam from the reboiler enters the compartment to desorb the gas adsorbed by the activated carbon in the compartment.

[0058] By setting up a cabin containing activated carbon, the adsorption and desorption treatment of the decarbonized gas can be achieved, and the decarbonized gas can be recycled and reused, reducing resource waste and lowering the probability of pollution.

[0059] In one embodiment, the method further comprises: returning the desorbed gas to the desorption tower in the form of steam.

[0060] The heat of the desorbed steam recovered through the desorption tower can be used to heat it, which can reduce the energy consumption of the reboiler.

[0061] In one embodiment, the method further includes pre-installing an air supply blower, a three-way ventilation valve, and a burner; and after the cabin's air inlet valve is closed, transferring residual gas from the cabin after activated carbon adsorption to the burner via the air supply blower and the three-way ventilation valve. The residual gas is clean air and can be transferred to the burner for further use, further improving resource utilization.

[0062] The specific execution process of the above steps can be found in the description of the above system embodiment and will not be repeated here.

[0063] Before the implementation of the embodiment of the present disclosure, the high-temperature flue gas is discharged from the burner and pre-treated for desulfurization, denitrification and dust removal before entering the carbon dioxide absorption tower and being reversely contacted with the carbon capture solvent containing organic amines to be captured. Due to incomplete pretreatment and decarbonization reaction, the decarbonized gas will contain a large amount of gas components such as VOCs, organic amines volatilized from the absorbent, a small amount of uncaptured CO2 gas and moisture, etc., which causes waste of resources and also causes secondary pollution to the air. In order to reduce the waste of resources in the absorption tower, reduce the probability of pollution, and fully consider the problem of resource reuse in subsequent processes, the embodiment of the present disclosure uses activated carbon adsorption and concentration to replace the traditional water washing process for the decarbonized gas discharged from the absorption tower, thereby overcoming the problems of water resource consumption and power consumption in the water washing process. At the same time, the disclosed embodiments utilize the residual steam heat from the desorption tower reboiler to alternately desorb and regenerate the activated carbon in the multi-compartment activated carbon adsorption and concentration device. The desorbed hot steam and condensed solution containing carbon and organic amines are then returned to the desorption tower, recovering and reusing the gas components in the decarbonized gas. Furthermore, the heat from the desorption steam is recovered to heat the desorption tower, reducing reboiler energy consumption. Furthermore, the reflux water and steam replenish the entire recovery system, maintaining the high capture efficiency of the carbon capture solution.

[0064] This embodiment further provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor. The electronic device may be a desktop computer, a tablet computer, a mobile terminal, etc., but this embodiment is not limited thereto. In this embodiment, the electronic device may be implemented with reference to the above-described method embodiments and the above-described device / system embodiments, the contents of which are incorporated herein, and any repetitions are omitted.

[0065] The embodiment of the present disclosure further provides a computer-readable storage medium having a computer program stored thereon, which is used to implement the steps of the above-mentioned recycling method when executed by a processor.

[0066] In summary, the disclosed embodiment proposes a scheme for concentrating and recovering decarbonized gas after capture and reusing the residual steam in the reboiler. The scheme uses the residual steam in the reboiler as a desorption heat source to efficiently recover the unabsorbed carbon dioxide, escaped organic amine absorbent and water in the decarbonized gas, thereby reducing the waste of effective resources, overcoming the problems of water resource consumption and power consumption in the water washing process in related technologies, and reducing the secondary pollution problem after the decarbonized gas is directly discharged. At the same time, the desorption liquid of the adsorption concentration device is refluxed. On the one hand, the organic amines and other effective components volatilized in the decarbonized gas are recovered and reused, and the carbon dioxide in the steam enters the next condensation section for storage as the temperature of the desorption tower rises. On the other hand, the heat of the desorption steam is recovered for heating the desorption tower, which can reduce the energy consumption of the reboiler. At the same time, the reflux water and steam can realize the water replenishment function for the entire system to maintain the high capture efficiency of the carbon capture solution.

[0067] Specific embodiments are used in the present disclosure to illustrate the principles and implementation methods of the present disclosure. The description of the above embodiments is only used to help understand the method and core ideas of the present disclosure. At the same time, for those skilled in the art, according to the ideas of the present disclosure, there may be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present disclosure.

Claims

1. An activated carbon concentration device for capturing decarbonized gas, which recovers and processes the decarbonized gas output from a carbon capture absorption tower, comprising: at least two compartments, each compartment containing activated carbon, wherein the flow direction of the decarbonized gas is controlled by a respective air inlet valve of each compartment; Activated carbon adsorption efficiency determination unit, used to determine the adsorption efficiency of activated carbon in each compartment; The air intake valve controller is used to control the air intake valve of the compartment to close and open the air intake valve of another compartment when the adsorption efficiency of the activated carbon in the compartment is lower than a predetermined value, so that the activated carbon in the other compartment can adsorb the decarbonized gas.

2. The activated carbon concentration device for capturing decarbonized gas according to claim 1, wherein each compartment is fed with high-temperature steam from the reboiler via its own steam input valve, and the device further comprises: The steam input valve controller is used to control the steam input valve of the cabin to open after the air inlet valve of the cabin is closed, so that the high-temperature steam of the reboiler can enter the cabin and desorb the gas adsorbed by the activated carbon in the cabin.

3. The activated carbon concentration device for capturing decarbonized gas according to claim 2 further comprises a reflux pipe, wherein the reflux pipe is used to return the desorbed gas to the desorption tower in the form of steam.

4. The activated carbon concentration device for capturing decarbonized gas according to any one of claims 1 to 3, further comprising an air supply blower, a three-way ventilation valve, and a burner, wherein: After the air inlet valve of the cabin is closed, the remaining gas in the cabin after being adsorbed by the activated carbon is input into the burner through the air supply fan and the three-ventilation valve.

5. A system for recovering captured decarbonized gas, comprising: An activated carbon concentration device, a carbon capture absorption tower, a reboiler, and a desorption tower for capturing decarbonized gas according to any one of claims 1 to 4, wherein the desorption tower desorbs carbon dioxide entering from the carbon capture absorption tower by heating the reboiler.

6. The system for recovering decarbonized gas after capture according to claim 5, wherein the desorption tower recovers the desorbed gas output from the activated carbon concentration device and refluxed in the form of steam, and performs a temperature raising operation based on the heat of the steam.

7. A method for recovering captured decarbonized gas, comprising: At least two compartments are provided, each compartment containing activated carbon, wherein each compartment is connected to a carbon capture and absorption tower, and each compartment controls the flow direction of the decarbonized gas output from the carbon capture and absorption tower through its own air inlet valve; determining an adsorption efficiency of the activated carbon in the chamber in response to the decarbonized gas entering the chamber; When the adsorption efficiency of the activated carbon in the compartment is lower than a predetermined value, the air intake valve of the compartment is controlled to close and the air intake valve of another compartment is opened, so that the activated carbon in the other compartment can adsorb the decarbonized gas.

8. The method for recovering captured decarbonized gas according to claim 7, further comprising: Each compartment inputs high-temperature steam into the reboiler through its own steam input valve; After the air inlet valve of the cabin is closed, the steam input valve of the cabin is controlled to open so that the high-temperature steam from the reboiler can enter the cabin to desorb the gas adsorbed by the activated carbon in the cabin.

9. The method for recovering captured decarbonized gas according to claim 8, further comprising: The desorbed gas is returned to the desorption tower in the form of steam.

10. The method for recovering captured decarbonized gas according to any one of claims 7 to 9, further comprising: Pre-set the air supply fan, three-way ventilation valve and burner; After the air inlet valve of the cabin is closed, the remaining gas in the cabin after being adsorbed by the activated carbon is input into the burner through the air supply fan and the three-ventilation valve.

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