Geothermal energy assisted combined cycle unit catalytic reforming system and method

Abstract

The application provides a geothermal energy assisted combined cycle unit catalytic reforming system and method, wherein the geothermal energy assisted combined cycle unit catalytic reforming system comprises a catalytic reforming unit, a carbon dioxide capturing unit, a carbon dioxide storage unit, a low-temperature flue gas storage unit, a geothermal energy storage unit, a hot water storage unit and a high-temperature flue gas storage unit. The catalytic reforming unit is suitable for catalytic reforming reaction of natural gas and carbon dioxide. The carbon dioxide capturing unit is connected with a waste heat boiler. The carbon dioxide storage unit is connected with the carbon dioxide capturing unit and the catalytic reforming unit. The low-temperature flue gas storage unit is connected with the waste heat boiler. The geothermal energy storage unit is suitable for storing a medium heated by geothermal energy. The hot water storage unit is connected with the waste heat boiler. The high-temperature flue gas storage unit is connected with a gas turbine. Carbon dioxide output by the carbon dioxide storage unit can enter the catalytic reforming unit after heat exchange with low-temperature flue gas, the medium, hot water and high-temperature flue gas. According to the above technical scheme, the problem that the power generation efficiency of an existing combined cycle unit power generation system is reduced due to hydrogen production by catalytic reforming reaction can be solved.

Description

Technical Field

[0001] This application relates to the field of power generation technology, and more specifically, to a geothermal-assisted combined cycle catalytic reforming system and method. Background Technology

[0002] A gas-steam combined cycle unit is a system that generates electricity by burning natural gas. However, the combustion of natural gas produces a large amount of carbon dioxide. To reduce carbon dioxide emissions, hydrogen is typically added to the gas turbine.

[0003] A common method for producing hydrogen is the catalytic reforming of natural gas. However, the catalytic reforming reaction requires high temperature and high pressure conditions, which leads to additional energy consumption and reduces the power generation efficiency of the power generation system. Summary of the Invention

[0004] This application provides at least one geothermal-assisted combined cycle unit catalytic reforming system and method to improve the problem of reduced power generation efficiency caused by hydrogen production through catalytic reforming in existing combined cycle unit power generation systems.

[0005] According to a first aspect of the embodiments of this application, a geothermal-assisted combined cycle unit catalytic reforming system is provided, comprising:

[0006] The catalytic reforming unit is suitable for catalytically reforming natural gas and carbon dioxide to produce hydrogen.

[0007] A carbon dioxide capture unit is connected to a waste heat boiler and is suitable for capturing carbon dioxide in the flue gas of the waste heat boiler.

[0008] A carbon dioxide storage unit, connected to the carbon dioxide capture unit, is adapted to store the captured carbon dioxide;

[0009] A low-temperature flue gas storage unit is connected to the waste heat boiler and is suitable for storing the waste heat boiler flue gas;

[0010] The first heat exchanger is connected to the low-temperature flue gas storage unit and is adapted to allow the stored waste heat boiler flue gas to exchange heat in the first heat exchanger.

[0011] Geothermal energy storage unit, suitable for storing media heated by geothermal energy;

[0012] The second heat exchanger is connected to the geothermal energy storage unit and is adapted to allow the stored medium to exchange heat in the second heat exchanger.

[0013] A hot water storage unit is connected to the waste heat boiler and is suitable for storing the hot water generated by the waste heat boiler during the unit's peak shaving process.

[0014] The third heat exchanger is connected to the hot water storage unit and is adapted to allow the stored hot water to exchange heat in the second heat exchanger;

[0015] A high-temperature flue gas storage unit is connected to a gas turbine and is suitable for storing the gas turbine flue gas;

[0016] The fourth heat exchanger, together with the high-temperature flue gas storage unit, is adapted to allow the stored gas turbine flue gas to exchange heat in the fourth heat exchanger;

[0017] The carbon dioxide storage unit is connected to the catalytic reforming unit via the first heat exchanger, the second heat exchanger, the third heat exchanger, and the fourth heat exchanger, which is suitable for ensuring that the carbon dioxide sent to the catalytic reforming unit reaches high temperature and high pressure.

[0018] In one optional embodiment, the carbon dioxide storage unit, the first heat exchanger, the second heat exchanger, the third heat exchanger, the fourth heat exchanger, and the catalytic reforming unit are connected in sequence.

[0019] In one optional embodiment, the low-temperature flue gas storage unit, the geothermal energy storage unit, the hot water storage unit, and the high-temperature flue gas storage unit are all located underground.

[0020] In one optional embodiment, the geothermal-assisted combined cycle unit waste heat recovery system further includes:

[0021] A separation unit, connected to the catalytic reforming unit, is adapted to separate impurities from the hydrogen gas.

[0022] In one optional embodiment, the geothermal-assisted combined cycle unit waste heat recovery system further includes:

[0023] A burner, connected to the separation unit, is adapted to burn the impurities.

[0024] In one alternative implementation, the burner is connected to the carbon dioxide storage unit.

[0025] In one alternative embodiment, the burner is connected to the waste heat boiler.

[0026] In one alternative implementation, the burner and the high-temperature flue gas storage unit form a cycle.

[0027] In one optional embodiment, the geothermal-assisted combined cycle unit waste heat recovery system further includes:

[0028] A quench tower, connected to the carbon dioxide capture unit and the carbon dioxide storage unit, is adapted to lower the temperature of the captured carbon dioxide.

[0029] According to a second aspect of the embodiments of this application, a geothermal-assisted combined cycle unit catalytic reforming method is also provided, comprising:

[0030] The medium heated by geothermal energy is stored in the geothermal energy storage unit;

[0031] Part of the flue gas generated by the waste heat boiler is stored in the low-temperature flue gas storage unit, the hot water generated by the waste heat boiler during the unit's peak shaving process is stored in the hot water storage unit, and the flue gas generated during the gas turbine's start-up and peak shaving is stored in the high-temperature flue gas storage unit.

[0032] The residual flue gas generated by the waste heat boiler is transported to the carbon dioxide capture unit;

[0033] The captured carbon dioxide is transported to the carbon dioxide storage unit;

[0034] The stored carbon dioxide is transported to the catalytic reforming unit after being heated in the first heat exchanger, the second heat exchanger, the third heat exchanger, and the fourth heat exchanger.

[0035] The above-mentioned technical solution of this application has the following beneficial technical effects:

[0036] The geothermal-assisted combined cycle catalytic reforming system of this application uses the carbon dioxide captured in the system as a catalyst for natural gas catalytic reforming. Furthermore, the waste heat from the flue gas and water in the system, supplemented by geothermal energy, is used to heat the captured carbon dioxide, enabling it to reach a high temperature and high pressure state. This not only allows the natural gas and carbon dioxide to undergo catalytic reforming but also saves additional energy consumption, which is beneficial to improving the power generation efficiency of the system.

[0037] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0038] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly described below. These drawings are incorporated in and constitute a part of this specification. They illustrate embodiments conforming to this application and, together with the specification, serve to explain the technical solutions of this application. It should be understood that the following drawings only show some embodiments of this application and should not be considered as limiting the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0039] Figure 1This paper shows a schematic diagram of a geothermal-assisted combined cycle catalytic reforming system provided in an embodiment of this application.

[0040] Reference numerals: 1. Gas turbine; 2. Waste heat boiler; 3. Steam turbine; 4. Generator; 5. Natural gas supply unit; 6. Carbon dioxide capture unit; 7. Carbon dioxide storage unit; 8. Compressor; 9. Quenching tower; 10. Catalytic reforming unit; 11. Separation unit; 12. Burner; 13. Low-temperature flue gas storage unit; 14. Geothermal energy storage unit; 15. Hot water storage unit; 16. High-temperature flue gas storage unit; 17. First heat exchanger; 18. Second heat exchanger; 19. Third heat exchanger; 20. Fourth heat exchanger. Detailed Implementation

[0041] It should be noted that, unless otherwise defined, the technical or scientific terms used in one or more embodiments of this specification should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in one or more embodiments of this specification do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word covers the element or object listed after the word and its equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0042] A gas-steam combined cycle unit is a system that generates electricity by burning natural gas. However, the combustion of natural gas produces a large amount of carbon dioxide. To reduce carbon dioxide emissions, hydrogen is typically added to the gas turbine.

[0043] A common method for producing hydrogen is the catalytic reforming of natural gas. However, the catalytic reforming reaction requires high temperature and high pressure conditions, which leads to additional energy consumption and reduces the power generation efficiency of the power generation system.

[0044] Therefore, this application provides a geothermal-assisted combined cycle unit catalytic reforming system and method to improve the problem of reduced power generation efficiency caused by hydrogen production through catalytic reforming in existing combined cycle unit power generation systems.

[0045] To make the objectives, technical solutions, and advantages of this application clearer, they will be described in detail below with reference to specific drawings and embodiments.

[0046] refer to Figure 1 , Figure 1 A schematic diagram of a geothermal-assisted combined cycle catalytic reforming system provided in an embodiment of this application is shown.

[0047] The geothermal-assisted combined cycle catalytic reforming system provided in this application includes a combined cycle unit. The combined cycle unit includes a gas turbine 1, a waste heat boiler 2, a steam turbine 3, a generator 4, and a natural gas supply unit 5. The gas turbine 1 is connected to the generator 4, and the gas turbine 1 performs work by burning natural gas to drive the generator 4 to generate electricity. The waste heat boiler 2 is connected to the gas turbine 1 and is used to recover waste heat from the flue gas of the gas turbine 1 and generate high-temperature flue gas. The steam turbine 3 is connected to the waste heat boiler 2, and the steam turbine 3 performs work under the action of the high-temperature flue gas to drive the generator 4 to generate electricity. The natural gas supply unit 5 is connected to the gas turbine 1 and is used to supply natural gas to the gas turbine 1. In this way, combined gas and steam power generation can be achieved.

[0048] In this embodiment, the geothermal-assisted combined cycle catalytic reforming system also includes a carbon dioxide capture unit 6. The carbon dioxide capture unit 6 is connected to the waste heat boiler 2 and is used to capture carbon dioxide from the flue gas discharged from the waste heat boiler 2. This capture of carbon dioxide from the flue gas reduces the carbon dioxide content in the emitted flue gas, thus contributing to environmental protection. Furthermore, as the amount of carbon dioxide captured in the unit system increases, this system can periodically seal a portion of the carbon dioxide underground, achieving the beneficial effect of reducing carbon emissions from the power plant.

[0049] In this embodiment, the geothermal-assisted combined cycle catalytic reforming system further includes a carbon dioxide storage unit 7. The carbon dioxide storage unit 7 is connected to the carbon dioxide capture unit 6 and is used to store the captured carbon dioxide. This enables the storage of captured carbon dioxide. Furthermore, the stored carbon dioxide can be used as a byproduct, generating additional economic benefits.

[0050] It should be understood that a compressor 8 can be installed between the carbon dioxide storage unit 7 and the carbon dioxide capture unit 6. In specific implementations, the compressor 8 can be used to compress carbon dioxide and store it in the carbon dioxide storage unit 7. This increases the amount of carbon dioxide stored.

[0051] In addition, a quench tower 9 can be installed between the carbon dioxide storage unit 7 and the carbon dioxide capture unit 6. In practice, the quench tower 9 can be used to cool the captured carbon dioxide. This facilitates the compression and storage of carbon dioxide.

[0052] In this embodiment, the geothermal-assisted combined cycle unit catalytic reforming system further includes a catalytic reforming unit 10. The catalytic reforming unit 10 is connected to the natural gas supply unit 5 and the gas turbine 1, and is used to catalytically reform the natural gas to generate hydrogen. In a specific implementation, the generated hydrogen can be supplied to the gas turbine 1 as part of its fuel. This reduces the carbon dioxide content in the exhaust gas.

[0053] It should be understood that a separation unit 11, such as a pressure swing adsorption (PSA) separator, can be installed between the catalytic reforming unit 10 and the gas turbine 1. In specific implementations, the separation unit 11 can be used to separate impurities from the hydrogen. Specifically, after the natural gas undergoes catalytic reforming, it can produce hydrogen and carbon-containing gases, such as carbon monoxide and carbon dioxide. By using the separation unit 11 to separate the carbon-containing gases from the hydrogen, the carbon dioxide content in the flue gas can be further reduced.

[0054] Additionally, the separation unit 11 can also be connected to the burner 12. In a specific implementation, the carbon monoxide separated by the separation unit 11 can be discharged into the burner 12 for combustion. This avoids carbon monoxide poisoning. The carbon dioxide produced by the combustion of carbon monoxide can be stored in the carbon dioxide storage unit 7 or transported to the waste heat boiler 2 as high-temperature flue gas. That is, the burner 12 can be connected to the carbon dioxide storage unit 7 / waste heat boiler 2.

[0055] In this embodiment, the geothermal-assisted combined cycle catalytic reforming system further includes a low-temperature flue gas storage unit 13, a hot water storage unit 15, and a high-temperature flue gas storage unit 16. The low-temperature flue gas storage unit 13 is connected to the waste heat boiler 2 and is used to store a portion of the flue gas discharged from the waste heat boiler 2. The hot water storage unit 15 is connected to the waste heat boiler 2 and is used to store the hot water generated by the waste heat boiler 2 during peak shaving. The high-temperature flue gas storage unit 16 is connected to the gas turbine 1 and is used to store the flue gas generated by the gas turbine 1 during startup and peak shaving. This enables the recovery of flue gas and water in the system. In specific implementations, the stored flue gas and water can be used for further waste heat recovery.

[0056] In practice, when it is necessary to separate flue gas and fuel gas, appropriate diverters can be installed. Furthermore, when it is necessary to store flue gas, appropriate pressure devices (air pumps) can be installed.

[0057] It should be understood that the low-temperature flue gas storage unit 13, the hot water storage unit 15, and the high-temperature flue gas storage unit 16 can be insulated to reduce energy loss. In the embodiments of this application, the low-temperature flue gas storage unit 13, the hot water storage unit 15, and the high-temperature flue gas storage unit 16 can be buried underground, and the strata can be used to insulate the low-temperature flue gas storage unit 13, the hot water storage unit 15, and the high-temperature flue gas storage unit 16.

[0058] It should be noted that the temperature of the flue gas discharged from the waste heat boiler 2 is generally between 90℃ and 110℃, the temperature of the hot water discharged from the waste heat boiler 2 is generally between 300℃ and 400℃, and the temperature of the flue gas discharged from the gas turbine 1 is generally above 500℃.

[0059] In this embodiment, the carbon dioxide storage unit 7 can be connected to the catalytic reforming unit 10. In a specific implementation, the carbon dioxide storage unit 7 can supply carbon dioxide to the catalytic reforming unit 10 so that the natural gas and carbon dioxide undergo a catalytic reforming reaction.

[0060] In this embodiment, the geothermal-assisted combined cycle catalytic reforming system further includes a first heat exchanger 17, a third heat exchanger 19, and a fourth heat exchanger 20. The first heat exchanger 17 is connected to the low-temperature flue gas storage unit 13, and is adapted to allow the stored waste heat boiler 2 flue gas to exchange heat in the first heat exchanger 17. The third heat exchanger 19 is connected to the hot water storage unit 15, and is adapted to allow the stored hot water to exchange heat in the second heat exchanger 18. The fourth heat exchanger 20 is connected to the high-temperature flue gas storage unit 16, and is adapted to allow the stored gas turbine 1 flue gas to exchange heat in the fourth heat exchanger 20. In a specific implementation, the carbon dioxide storage unit 7 and the catalytic reforming unit 10 can be connected via the first heat exchanger 17, the third heat exchanger 19, and the fourth heat exchanger 20, so that carbon dioxide can exchange heat in the first heat exchanger 17, the third heat exchanger 19, and the fourth heat exchanger 20 before entering the catalytic reforming unit 10. Specifically, the flue gas and water stored in the low-temperature flue gas storage unit 13, the hot water storage unit 15, and the high-temperature flue gas storage unit 16 can be used to heat carbon dioxide. In this way, not only can waste heat be recovered, but the natural gas can also meet the high temperature and high pressure conditions when reacting with carbon dioxide.

[0061] In practical applications, the hot water storage unit 15 and the high-temperature flue gas storage unit 16 cannot continuously store hot water and high-temperature flue gas. This can lead to fluctuations in the temperature and pressure of carbon dioxide, and may even prevent the conditions required for the reaction from being reached, thus affecting the reaction efficiency of natural gas and carbon dioxide.

[0062] Therefore, in this embodiment, other methods can also be used to heat carbon dioxide to compensate for the inadequacy of hot water and high-temperature flue gas as heat sources.

[0063] In some embodiments, the geothermal-assisted combined cycle catalytic reforming system further includes a geothermal energy storage unit 14 and a second heat exchanger 18. The geothermal energy storage unit 14 stores a medium heated by geothermal energy, such as brine. The second heat exchanger 18 is connected to the geothermal energy storage unit 14 and allows the stored medium to exchange heat within the second heat exchanger 18. In a specific embodiment, the carbon dioxide storage unit 7 and the catalytic reforming unit 10 can also be connected via the second heat exchanger 18, allowing the carbon dioxide to absorb heat from the medium, thereby reducing temperature fluctuations in the carbon dioxide.

[0064] In a specific configuration, the geothermal energy storage unit 14 can be installed underground to continuously absorb heat radiated from underground, so as to avoid fluctuations in carbon dioxide temperature.

[0065] Compared to using electric heating to heat carbon dioxide, geothermal energy is a green energy source that not only saves energy but also reduces environmental pollution.

[0066] It should be understood that under the influence of geothermal energy, the temperature of the medium will generally remain around 300℃. In specific implementation, the carbon dioxide storage unit 7 and the catalytic reforming unit 10 can be connected sequentially through the first heat exchanger 17, the second heat exchanger 18, the third heat exchanger 19, and the fourth heat exchanger 20. This allows the carbon dioxide temperature to gradually increase, which is beneficial for improving heat exchange efficiency.

[0067] In addition, in this embodiment, heat can be added to the high-temperature flue gas to compensate for the inability to continuously store the high-temperature flue gas.

[0068] In some embodiments, a circulation is formed between the high-temperature flue gas storage unit 16 and the burner 12. In a specific implementation, the flue gas in the high-temperature flue gas storage unit 16 can circulate between the burner 12 and the high-temperature flue gas storage unit 16, and during the circulation process, the flue gas can be heated by the combustion of carbon monoxide, thereby enabling the replenishment of heat to the high-temperature flue gas to compensate for the inability to continuously store the high-temperature flue gas.

[0069] The geothermal-assisted combined cycle catalytic reforming system of this application uses the carbon dioxide captured in the system as a catalyst for natural gas catalytic reforming. Furthermore, the waste heat from the flue gas and water in the system, supplemented by geothermal energy, is used to heat the captured carbon dioxide, enabling it to reach a high temperature and high pressure state. This not only allows the natural gas and carbon dioxide to undergo catalytic reforming but also saves additional energy consumption, which is beneficial to improving the power generation efficiency of the system.

[0070] This application also provides a geothermal-assisted catalytic reforming method for a combined cycle unit, including:

[0071] Step S1: Store the medium heated by geothermal energy in the geothermal energy storage unit;

[0072] Step S2: Store a portion of the flue gas generated by the waste heat boiler 2 in the low-temperature flue gas storage unit 13, store the hot water generated by the waste heat boiler 2 during the unit's peak shaving process in the hot water storage unit 15, and store the flue gas generated by the gas turbine 1 during startup and peak shaving in the high-temperature flue gas storage unit 16.

[0073] Step S3: The residual flue gas generated by the waste heat boiler 2 is transported to the carbon dioxide capture unit 6;

[0074] Step S4: The captured carbon dioxide is transported to the carbon dioxide storage unit 7;

[0075] Step S5: After the stored carbon dioxide is heat-exchanged in the first heat exchanger 17, the second heat exchanger 18, the third heat exchanger 19 and the fourth heat exchanger 20, it is transported to the catalytic reforming unit 10.

[0076] The geothermal-assisted combined cycle catalytic reforming system of this application uses the carbon dioxide captured in the system as a catalyst for natural gas catalytic reforming. Furthermore, the waste heat from the flue gas and water in the system, supplemented by geothermal energy, is used to heat the captured carbon dioxide, enabling it to reach a high temperature and high pressure state. This not only allows the natural gas and carbon dioxide to undergo catalytic reforming but also saves additional energy consumption, which is beneficial to improving the power generation efficiency of the system.

[0077] One or more embodiments in 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 in this specification should be included within the protection scope of this application.

[0078] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A geothermal-assisted combined cycle catalytic reforming system, characterized in that, include: The catalytic reforming unit is suitable for catalytically reforming natural gas and carbon dioxide to produce hydrogen. A carbon dioxide capture unit is connected to a waste heat boiler and is suitable for capturing carbon dioxide in the flue gas of the waste heat boiler, the temperature of which is 90℃-110℃. A carbon dioxide storage unit, connected to the carbon dioxide capture unit, is adapted to store the captured carbon dioxide; A low-temperature flue gas storage unit is connected to the waste heat boiler and is suitable for storing the waste heat boiler flue gas; The first heat exchanger is connected to the low-temperature flue gas storage unit and is adapted to allow the stored waste heat boiler flue gas to exchange heat in the first heat exchanger. Geothermal energy storage unit, suitable for storing media heated by geothermal energy; The second heat exchanger is connected to the geothermal energy storage unit and is adapted to allow the stored medium to exchange heat in the second heat exchanger. A hot water storage unit is connected to the waste heat boiler and is suitable for storing the hot water generated by the waste heat boiler during the unit's peak shaving process. The third heat exchanger is connected to the hot water storage unit and is adapted to allow the stored hot water to exchange heat in the second heat exchanger; A high-temperature flue gas storage unit is connected to a gas turbine and is suitable for storing the gas turbine flue gas; The fourth heat exchanger, together with the high-temperature flue gas storage unit, is adapted to allow the stored gas turbine flue gas to exchange heat in the fourth heat exchanger; The carbon dioxide storage unit is connected to the catalytic reforming unit via the first heat exchanger, the second heat exchanger, the third heat exchanger, and the fourth heat exchanger, which is suitable for ensuring that the carbon dioxide sent to the catalytic reforming unit reaches high temperature and high pressure.

2. The geothermal energy-assisted combined cycle catalytic reforming system according to claim 1, characterized in that, The carbon dioxide storage unit, the first heat exchanger, the second heat exchanger, the third heat exchanger, the fourth heat exchanger, and the catalytic reforming unit are connected in sequence.

3. The geothermal-assisted combined cycle catalytic reforming system according to claim 1, characterized in that, The low-temperature flue gas storage unit, the geothermal energy storage unit, the hot water storage unit, and the high-temperature flue gas storage unit are all located underground.

4. The geothermal energy-assisted combined cycle catalytic reforming system according to claim 1, characterized in that, The geothermal energy-assisted combined cycle catalytic reforming system also includes: A separation unit, connected to the catalytic reforming unit, is adapted to separate impurities from the hydrogen gas.

5. The geothermal energy-assisted combined cycle catalytic reforming system according to claim 4, characterized in that, The geothermal energy-assisted combined cycle catalytic reforming system also includes: A burner, connected to the separation unit, is adapted to burn the impurities.

6. The geothermal energy-assisted combined cycle catalytic reforming system according to claim 5, characterized in that, The burner is connected to the carbon dioxide storage unit.

7. The geothermal-assisted combined cycle catalytic reforming system according to claim 5, characterized in that, The burner is connected to the waste heat boiler.

8. The geothermal-assisted combined cycle catalytic reforming system according to claim 5, characterized in that, The burner and the high-temperature flue gas storage unit form a cycle.

9. The geothermal-assisted combined cycle catalytic reforming system according to claim 1, characterized in that, The geothermal energy-assisted combined cycle catalytic reforming system also includes: A quench tower, connected to the carbon dioxide capture unit and the carbon dioxide storage unit, is adapted to lower the temperature of the captured carbon dioxide.

10. A method for catalytic reforming using a geothermal energy-assisted combined cycle unit catalytic reforming system as described in any one of claims 1-9, characterized in that, include: The medium heated by geothermal energy is stored in the geothermal energy storage unit; Part of the flue gas generated by the waste heat boiler is stored in the low-temperature flue gas storage unit, the hot water generated by the waste heat boiler during the unit's peak shaving process is stored in the hot water storage unit, and the flue gas generated during the gas turbine's start-up and peak shaving is stored in the high-temperature flue gas storage unit. The residual flue gas generated by the waste heat boiler is transported to the carbon dioxide capture unit; The captured carbon dioxide is transported to the carbon dioxide storage unit; The stored carbon dioxide is transported to the catalytic reforming unit after being heated in the first heat exchanger, the second heat exchanger, the third heat exchanger, and the fourth heat exchanger.

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