Carbon dioxide trapping and recycling system and method

Abstract

The invention relates to the technical field of thermal power generation, in particular to a carbon dioxide capturing and recycling system and method. The carbon dioxide capturing and recycling system is suitable for a thermal power coal-fired unit, and comprises a boiler used for combustion to form flue gas; a gas inlet of the carbon dioxide trapping device is connected to a flue gas outlet of the boiler, and the carbon dioxide trapping device is used for trapping carbon dioxide in the flue gas; a gas inlet and a gas outlet of the carbon dioxide reduction device are connected to a gas outlet of the carbon dioxide capture device and a fuel gas inlet of the boiler respectively, and the carbon dioxide reduction device is used for reducing the carbon dioxide into methane for combustion of the boiler. According to the scheme, the carbon emission and the coal consumption of the thermal power generating unit can be reduced, and the captured carbon dioxide does not need to be stored and transported, so that the storage and transportation cost can be saved, and the risk in the storage and transportation process is avoided.

Description

Technical Field

[0001] This application relates to the technical field of thermal power generation, and more particularly, to a carbon dioxide capture and reuse system and method. Background Art

[0002] In thermal power plants, a common carbon emission reduction method is the CCUS technology. It mainly collects the CO2 generated by boiler combustion, enables its resource reuse or injects it into geological formations or saline aquifers for long-term storage, thereby achieving the process of permanent CO2 emission reduction.

[0003] However, the main difficulties faced by existing CCUS technologies are as follows:

[0004] (1) A large amount of energy is required to provide the heat needed for carbon dioxide capture. This energy usually comes from fossil fuels, which themselves also produce carbon dioxide emissions.

[0005] (2) The utilization of carbon dioxide is not yet widespread, and the market demand is relatively small, resulting in difficulties in ensuring its economic benefits. This also restricts the development of carbon dioxide utilization technologies.

[0006] (3) Underground storage is the main method for carbon dioxide storage, but the underground storage capacity is limited. In some areas, the underground storage conditions are not ideal and cannot hold enough carbon dioxide. In addition, underground storage also poses certain risks, such as the possibility of causing geological disasters such as earthquakes, and requires more careful assessment and management.

[0007] (4) There are certain safety risks in underground storage, mainly related to the problem of carbon dioxide leakage. If leakage occurs during the storage process, it will not only affect the environment but also pose a threat to human health and safety.

[0008] (5) Underground storage requires certain investment and operating costs, such as geological exploration, wellbore construction, monitoring, and management. These costs greatly affect the practical application of CCUS technology. Summary of the Invention

[0009] The embodiments of this application at least provide a carbon dioxide capture and reuse system and method, which can reduce the carbon emissions and coal consumption of thermal power units, and there is no need to store and transport the captured carbon dioxide, thereby saving the costs of storage and transportation and avoiding the risks during storage and transportation.

[0010] In a first aspect, the embodiments of this application provide a carbon dioxide capture and reuse system applicable to thermal power coal-fired units. The system includes:

[0011] A boiler for burning to form flue gas;

[0012] A carbon dioxide capture device, whose air inlet is connected to the flue gas outlet of the boiler, is used to capture carbon dioxide in the flue gas;

[0013] A carbon dioxide reduction device, whose air inlet and air outlet are respectively connected to the air outlet of the carbon dioxide capture device and the gas inlet of the boiler, is used to reduce the carbon dioxide into methane for combustion in the boiler.

[0014] In an optional embodiment, the carbon dioxide capture device includes:

[0015] A decarbonization tower, whose air inlet is connected to the flue gas outlet of the boiler, is used to react carbon dioxide in the flue gas with an amine solution to form an amine salt;

[0016] A distillation tower, whose salt inlet is connected to the salt outlet of the decarbonization tower and the air inlet of the carbon dioxide reduction device, is used to heat the amine salt to form an amine solution and carbon dioxide, and respectively transport the amine solution and the carbon dioxide to the decarbonization tower and the carbon dioxide reduction device.

[0017] In an optional embodiment, the steam inlet of the distillation tower is connected to the steam outlet of the boiler water wall, and the water outlet of the distillation tower is connected to the water inlet of the boiler water wall.

[0018] In an optional embodiment, the system further includes: a chimney, whose air inlet is connected to the tail gas outlet of the decarbonization tower, for discharging the tail gas of the decarbonization tower.

[0019] In an optional embodiment, the carbon dioxide reduction device includes:

[0020] A pool body, which is respectively connected to the air outlet of the carbon dioxide capture device and the gas inlet of the boiler;

[0021] An electrode, including a cathode and an anode, both of which are arranged in the pool body;

[0022] A power source, whose positive and negative poles are respectively connected to the cathode and the anode, is used to provide a voltage to make electrons flow from the anode through the pool body to the cathode, so that the carbon dioxide accepts electrons to form methane.

[0023] In an optional embodiment, the carbon dioxide reduction device is powered by the thermal power coal-fired unit.

[0024] In a second aspect, the embodiments of the present application further provide a carbon dioxide capture and reuse method, which is applicable to the carbon dioxide capture and reuse system according to any one of the first aspect. The method includes:

[0025] Transport the flue gas formed by the combustion of the boiler to the carbon dioxide capture device;

[0026] Use the carbon dioxide capture device to capture carbon dioxide in the flue gas and transport the carbon dioxide to the carbon dioxide reduction device;

[0027] Use the carbon dioxide reduction device to reduce the carbon dioxide to form methane and transport the methane to the boiler for the boiler to burn.

[0028] In an alternative embodiment, the capture method of the carbon dioxide capture device includes:

[0029] Use a decarbonization tower to react carbon dioxide in the flue gas with an amine solution to form an amine salt and transport the formed amine salt to a distillation tower;

[0030] Use the distillation tower to heat the amine salt to form an amine solution and carbon dioxide, and transport the formed amine solution and carbon dioxide to the decarbonization tower and the carbon dioxide reduction device respectively.

[0031] In an alternative embodiment, the carbon dioxide reduction device uses electrolysis technology to reduce the carbon dioxide to form methane.

[0032] In an alternative embodiment, the carbon dioxide reduction device is powered by the thermal power coal-fired unit.

[0033] The above technical solution of the present application has the following beneficial technical effects:

[0034] The carbon dioxide capture and reuse system of the embodiment of the present application can capture carbon dioxide in the flue gas, which can reduce the carbon emissions of the thermal power unit and improve the economic and social benefits of the unit operation. Moreover, the system can also reduce the captured carbon dioxide to methane and transport it to the boiler to replace part of the coal fuel, which can reduce the coal consumption of the unit and improve the economic benefits of the unit. In addition, there is no need to store and transport the captured carbon dioxide, thus saving the costs of storage and transportation and avoiding the risks during the storage and transportation process.

[0035] To make the above objects, features and advantages of the present application more obvious and understandable, the following specific preferred embodiments are given in conjunction with the accompanying drawings and are described in detail as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] To more clearly illustrate the technical solutions of the embodiments of the present application, the accompanying drawings required for the embodiments will be briefly introduced below. The accompanying drawings here are incorporated into the specification and constitute a part of this specification. These accompanying drawings show embodiments consistent with the present application and are used together with the specification to illustrate the technical solutions of the present application. It should be understood that the following accompanying drawings only show some embodiments of the present application and should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other relevant accompanying drawings can be obtained based on these accompanying drawings.

[0037] Figure 1 Shows a schematic diagram of a carbon dioxide capture and reuse system provided by an embodiment of the present application;

[0038] Reference numerals:

[0039] 1. Boiler; 2. Decarbonization tower; 21. First spraying device; 22. Amine salt pool; 3. Distillation tower; 31. Serpentine heat exchange tube; 32. Second spraying device; 33. Ammonia solution pool; 34. Carbon dioxide collector; 4. Electrolytic cell; 41. Cell body; 42. Cathode; 43. Anode; 44. Power supply; 45. Methane collector; 101. Flue gas pipeline; 102. Carbon dioxide pipeline; 103. Methane pipeline; 104. Tail gas pipeline; 105. Amine salt pipeline; 106. Intake pipeline; 107. Outlet pipeline; 108. Amine solution pipeline; 201. Booster fan; 202. First booster pump; 203. Second booster pump; 204. Third booster pump. Detailed implementation manners

[0040] Now, various exemplary embodiments of the present application will be described in detail with reference to the accompanying drawings. It should be noted that: Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps described in these embodiments do not limit the scope of the present application.

[0041] The embodiments of the present application will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and should not be construed as limiting the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts fall within the scope of protection of the present application.

[0042] The terms "first", "second", etc. in the description and claims of this application may explicitly or implicitly include one or more of such features. In the description of this application, unless otherwise specified, the meaning of "a plurality" is two or more. In addition, "and / or" in the description and claims means at least one of the connected objects, and the character " / ", generally represents an "or" relationship between the associated objects before and after.

[0043] In the description of this application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to this application.

[0044] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected to" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0045] Reference Figure 1 As shown in, an embodiment of this application provides a carbon dioxide capture and reuse system, which is applicable to thermal power coal-fired units. The system includes: a boiler 1, a carbon dioxide capture device, and a carbon dioxide reduction device. The boiler 1 is used for combustion to form flue gas. The inlet of the carbon dioxide capture device is connected to the flue gas outlet of the boiler 1, and is used to capture carbon dioxide in the flue gas. The inlet and outlet of the carbon dioxide reduction device are respectively connected to the outlet of the carbon dioxide capture device and the gas inlet of the boiler 1, and are used to reduce carbon dioxide to methane for the boiler 1 to burn.

[0046] That is to say, the working method of the carbon dioxide capture and reuse system includes: conveying the flue gas formed by the combustion of the boiler 1 to the carbon dioxide capture device; the carbon dioxide capture device captures carbon dioxide in the flue gas and conveys the carbon dioxide to the carbon dioxide reduction device; the carbon dioxide reduction device reduces carbon dioxide to form methane and conveys the methane to the boiler 1 for the boiler 1 to burn.

[0047] In a specific implementation, the carbon dioxide capture and reuse system of the embodiments of the present application can capture carbon dioxide in flue gas, thereby reducing the carbon emissions of thermal power units and improving the economic and social benefits of unit operation. Moreover, the system can also reduce the captured carbon dioxide to methane and transport it to Boiler 1 to replace part of the coal fuel, which can reduce the coal consumption of the unit and improve the economic benefits of the unit. Additionally, there is no need to store and transport the captured carbon dioxide, thus saving the costs of storage and transportation and avoiding the risks during storage and transportation.

[0048] In some embodiments, a flue gas pipeline 101 is provided between Boiler 1 and the carbon dioxide capture device. One end of the flue gas pipeline 101 is connected to the flue gas outlet of Boiler 1, and the other end is connected to the inlet of the carbon dioxide capture device, for transporting the flue gas generated by combustion to the carbon dioxide capture device.

[0049] In some embodiments, a carbon dioxide pipeline 102 is provided between the carbon dioxide capture device and the carbon dioxide reduction device. One end of the carbon dioxide pipeline 102 is connected to the outlet of the carbon dioxide capture device, and the other end is connected to the inlet of the carbon dioxide reduction device, for transporting the captured carbon dioxide gas to the carbon dioxide reduction device.

[0050] In some embodiments, a methane pipeline 103 is provided between the carbon dioxide reduction device and Boiler 1. One end of the methane pipeline 103 is connected to the outlet of the carbon dioxide reduction device, and the other end is connected to the gas inlet of Boiler 1, for transporting the reduced methane to Boiler 1 for combustion in Boiler 1. Specifically, a booster fan 201 can be provided on the methane pipeline 103 to overcome the resistance during methane transportation.

[0051] In some embodiments, the carbon dioxide capture device uses the chemical absorption method to capture carbon dioxide in the flue gas.

[0052] In some embodiments, the capture method of the carbon dioxide capture device includes: reacting carbon dioxide in the flue gas with an amine solution in a decarbonization tower 2 to form an amine salt, and transporting the formed amine salt to a distillation tower 3; heating the amine salt in the distillation tower 3 to form an amine solution and carbon dioxide, and transporting the formed amine solution and carbon dioxide to the decarbonization tower 2 and the carbon dioxide reduction device respectively.

[0053] That is to say, the carbon dioxide capture device includes a decarbonization tower 2 and a distillation tower 3. The air inlet of the decarbonization tower 2 (i.e., the air inlet of the carbon dioxide capture device) is connected to the flue gas outlet of the boiler 1, and is used to react carbon dioxide in the flue gas with the amine solution to form amine salts. The salt inlet of the distillation tower 3 is connected to the salt outlet of the decarbonization tower 2, the amine solution outlet of the distillation tower 3 is connected to the amine solution inlet of the decarbonization tower 2, and the air outlet of the distillation tower 3 (i.e., the air outlet of the carbon dioxide capture device) is connected to the air inlet of the carbon dioxide reduction device, and is used to heat the amine salts to form an amine solution and carbon dioxide, and respectively transport the amine solution and carbon dioxide to the decarbonization tower 2 and the carbon dioxide reduction device. With such a setting, the carbon dioxide capture device can capture carbon dioxide in the flue gas. In addition, since the amine solution circulates between the decarbonization tower 2 and the distillation tower 3, the usage amount of the amine solution can be reduced, which is beneficial to cost savings. Moreover, the amine solution can absorb heat in the distillation tower 3 to increase its temperature, so that the chemical reaction rate between the amine solution and carbon dioxide can be accelerated, and thus the absorption efficiency of carbon dioxide can be improved.

[0054] In some embodiments, a first spraying device 21 and an amine salt pool 22 are arranged in the decarbonization tower 2. The first spraying device 21 is located at the top inside the decarbonization tower 2 and is communicated with the amine solution inlet of the decarbonization tower 2. During use, the first spraying device 21 is used to uniformly spray the amine solution into the decarbonization tower 2 so that the amine solution can fully contact with carbon dioxide in the flue gas. The amine salt pool 22 is located at the bottom inside the decarbonization tower 2 and is communicated with the salt outlet of the decarbonization tower 2. During use, the amine salts generated after the amine solution contacts with carbon dioxide fall into the amine salt pool 22 and are sent out from the salt outlet of the decarbonization tower 2.

[0055] In some embodiments, the air inlet and the air outlet of the decarbonization tower 2 are respectively arranged on the opposite side walls of the decarbonization tower 2. In this way, it is convenient for the flue gas to traverse the decarbonization tower 2 so that carbon dioxide in the flue gas can fully contact with the amine solution. It should be understood that since the flue gas flows from bottom to top, when specifically arranged, the height of the air inlet is less than the height of the air outlet.

[0056] In some embodiments, the decarbonization tower 2 has a tail gas outlet connected to an external chimney. When specifically arranged, the tail gas outlet of the decarbonization tower 2 is connected to the air inlet of the chimney through a tail gas pipeline 104. During specific use, the purified flue gas (tail gas) after decarbonization treatment can be discharged into the atmosphere through the chimney.

[0057] In some embodiments, an amine salt pipeline 105 is arranged between the decarbonization tower 2 and the distillation tower 3. One end of the amine salt pipeline 105 is connected to the salt outlet of the decarbonization tower 2, and the other end is connected to the salt inlet of the distillation tower 3, and is used to transport the formed amine salts to the distillation tower 3. When specifically arranged, a first booster pump 202 can be arranged on the amine salt pipeline 105 to pressurize the amine salts so that the amine salts can be smoothly transported to the distillation tower 3.

[0058] In some embodiments, a serpentine heat exchange tube 31 is disposed in the distillation column 3, and high-temperature steam circulates in the serpentine heat exchange tube 31 for heating the amine salt entering the distillation column 3 so that the amine salt forms an amine solution and carbon dioxide.

[0059] In some embodiments, the distillation column 3 has a steam inlet and a steam outlet respectively connected to both ends of the serpentine heat exchange tube 31. The steam inlet of the distillation column 3 is connected to the outlet of the water wall of the boiler 1, and the steam outlet of the distillation column 3 is connected to the inlet of the water wall of the boiler 1. In specific use, the boiler 1 burns to form high-temperature steam in its water wall, and the high-temperature steam can circulate between the water wall of the boiler 1 and the distillation column 3 to provide a heat source for the distillation column 3. Compared with the method of heating using an external heat source, heating the amine salt with high-temperature steam can avoid the consumption of fossil fuels during the process of carbon dioxide capture, thereby reducing carbon emissions.

[0060] In some embodiments, an intake pipe 106 and an outlet pipe 107 are provided between the distillation column 3 and the water wall of the boiler 1. One end of the intake pipe 106 is connected to the steam inlet of the distillation column 3, and the other end is connected to the outlet of the water wall of the boiler 1. One end of the outlet pipe 107 is connected to the steam outlet of the distillation column 3, and the other end is connected to the inlet of the water wall of the boiler 1. In this way, the circulation of high-temperature steam between the water wall of the boiler 1 and the distillation column 3 can be realized. In specific settings, a second booster pump 203 can be provided on the outlet pipe 107 to boost the steam so that the steam circulates between the distillation column 3 and the water wall of the boiler 1.

[0061] In some embodiments, a second spraying device 32 and an amine solution pool are provided in the distillation column 3. The second spraying device 32 is located at the inner top of the distillation column 3 and is communicated with the salt inlet of the distillation column 3. During use, the second spraying device 32 is used to evenly spray the amine salt into the distillation column 3 so that the amine salt can be evenly heated. The amine solution pool is located at the inner bottom of the distillation column 3 and is communicated with the amine solution outlet of the distillation column 3. During use, the amine solution generated by the decomposition of the amine salt can fall into the amine solution pool and be sent out from the amine solution outlet of the distillation column 3 to return to the decarbonization column 2.

[0062] In some embodiments, an amine solution pipe 108 is provided between the distillation column 3 and the decarbonization column 2. One end of the amine solution pipe 108 is connected to the amine solution outlet of the distillation column 3, and the other end is connected to the amine solution inlet of the decarbonization column 2 for transporting the amine solution to the decarbonization column 2. In specific settings, a third booster pump 204 can be provided on the amine solution pipe 108 to boost the amine solution to overcome the resistance during the transportation of the amine solution.

[0063] In some embodiments, a carbon dioxide collector 34 is provided in the distillation column 3. The carbon dioxide is connected to the outlet of the distillation column 3, and is used to collect the separated carbon dioxide and send the carbon dioxide out through the outlet of the distillation column 3.

[0064] In some embodiments, the carbon dioxide reduction device uses electrolysis technology to reduce carbon dioxide to methane.

[0065] In some embodiments, the carbon dioxide reduction device includes an electrolytic cell 4. The electrolytic cell 4 includes a cell body 41, electrodes, and a power source 44. The cell body 41 has an inlet (i.e., the inlet of the carbon dioxide reduction device) and an outlet (i.e., the outlet of the carbon dioxide reduction device). Its inlet and outlet are respectively connected to the outlet of the carbon dioxide capture device and the gas inlet of the boiler 1. The electrodes include a cathode 42 and an anode 43, and both the cathode 42 and the anode 43 are disposed in the cell body 41. The positive and negative electrodes of the power source 44 are respectively connected to the cathode 42 and the anode 43, and are used to provide a voltage to enable electrons to flow from the anode 43 through the cell body 41 to the cathode 42, so that carbon dioxide accepts electrons on the surface of the cathode 42 to form methane. It should be understood that carbon dioxide needs to be directly added to the electrolyte in the cell body 41. Therefore, when specifically arranged, one end of the carbon dioxide pipeline 102 can be directly introduced into the electrolyte through the inlet of the cell body 41.

[0066] In some embodiments, the electrodes can be made of copper-based materials. In a specific implementation, copper can be used as a catalyst to promote the reduction reaction of carbon dioxide.

[0067] In some embodiments, a methane collector 45 is provided in the cell body 41. The methane collector 45 is connected to the outlet of the cell body 41, and is used to collect the methane generated by the reaction and send the methane out through the outlet of the cell body 41.

[0068] In some embodiments, the carbon dioxide reduction device is powered by a thermal power coal-fired unit.

[0069] One or more embodiments of this specification are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of one or more embodiments of this specification shall be included in the protection scope of this application.

[0070] The above is only the specific implementation manner of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in this application, and all of them should be covered by the protection scope of this application. Therefore, the protection scope of this application shall be subject to the protection scope of the claims.

Claims

1. A carbon dioxide capture and reuse system, applicable to coal-fired power generation units, characterized in that: The system comprises: Boiler, used for combustion to form flue gas; a carbon dioxide capture device, the air inlet of which is connected to the flue gas outlet of the boiler, for capturing carbon dioxide in the flue gas; The carbon dioxide reduction device has an air inlet and an air outlet respectively connected to the air outlet of the carbon dioxide capture device and the fuel gas inlet of the boiler, and is used to reduce the carbon dioxide into methane for combustion in the boiler.

2. The carbon dioxide capture and reuse system according to claim 1, characterized in that: The carbon dioxide capture device comprises: A decarbonization tower, whose air inlet is connected to the flue gas outlet of the boiler, and is used for reacting carbon dioxide in the flue gas with an amine solution to form an amine salt; A distillation tower, whose salt inlet is connected to the salt outlet of the decarbonization tower, is used to heat the amine salt to form an amine solution and carbon dioxide, and transport the amine solution and the carbon dioxide to the decarbonization tower and the carbon dioxide reduction device respectively.

3. The carbon dioxide capture and reuse system according to claim 2, characterized in that: The steam inlet of the distillation tower is connected to the steam outlet of the boiler water-cooled wall, and the water outlet of the distillation tower is connected to the water inlet of the boiler water-cooled wall.

4. The carbon dioxide capture and reuse system according to claim 2, characterized in that: The system further comprises: a chimney, wherein an air inlet of the chimney is connected to an exhaust gas outlet of the decarbonization tower for discharging the exhaust gas of the decarbonization tower.

5. The carbon dioxide capture and reuse system according to claim 1, characterized in that: The carbon dioxide reduction device comprises: A cell body, which is respectively connected to the gas outlet of the carbon dioxide capture device and the gas inlet of the boiler; Electrodes, including a cathode and an anode, wherein the cathode and the anode are both disposed in the cell body; A power source, whose positive and negative electrodes are respectively connected to the cathode and the anode, is used to provide voltage to make electrons flow from the anode to the cathode through the cell body, so that the carbon dioxide accepts electrons to form methane.

6. The carbon dioxide capture and reuse system according to claim 4, characterized in that: The carbon dioxide reduction device is powered by the thermal power coal-fired unit.

7. A method for capturing and reusing carbon dioxide, applicable to the carbon dioxide capturing and reusing system according to any one of claims 1 to 6, characterized in that: The method comprises: transporting flue gas generated by combustion of the boiler to the carbon dioxide capture device; Using the carbon dioxide capture device to capture carbon dioxide in the flue gas, and transporting the carbon dioxide to the carbon dioxide reduction device; The carbon dioxide reduction device is used to reduce the carbon dioxide to form methane, and the methane is transported to the boiler for combustion in the boiler.

8. The method according to claim 7, characterized in that The capture method of the carbon dioxide capture device comprises: Using a decarbonization tower to react carbon dioxide in the flue gas with an amine solution to form an amine salt, and transporting the formed amine salt to a distillation tower; The amine salt is heated by a distillation tower to form an amine solution and carbon dioxide, and the formed amine solution and carbon dioxide are respectively transported to the decarbonization tower and the carbon dioxide reduction device.

9. The method according to claim 7, characterized in that: The carbon dioxide reduction device uses electrolysis technology to reduce the carbon dioxide to form methane.

10. The method according to claim 9, characterized in that The carbon dioxide reduction device is powered by the thermal power coal-fired unit.

Images