Integrated methanol-to-hydrogen and high and low temperature fuel cell cogeneration system and method

Abstract

The application discloses a kind of integrated methanol hydrogen production and high-low temperature fuel cell cogeneration system and method, the system includes methanol reforming hydrogen production module, low temperature fuel cell module and high temperature fuel cell module;The hydrogen used in the low temperature fuel cell module comes from hydrogen storage tank, the hydrogen used in the high temperature fuel cell module comes from methanol reforming hydrogen production module;The exhaust gas generated by the low temperature fuel cell module and high temperature fuel cell module is combusted after passing through combustor, to provide heat for methanol reforming hydrogen production module;Through low temperature fuel cell module and high temperature fuel cell module, user side is powered, the heat generated by high temperature fuel cell module and low temperature fuel cell module is used for heating user side;The application provides hydrogen for high-temperature PEMFC module with low hydrogen dependence by methanol reforming hydrogen production module, provides high-purity hydrogen for low-temperature PEMFC module with high hydrogen dependence, reduces the use of high-purity hydrogen in the whole system, and reduces the cost of using hydrogen.

Description

Technical Field

[0001] This invention relates to the field of fuel cell technology, specifically to an integrated methanol-to-hydrogen and high / low temperature fuel cell combined heat and power system and method. Background Technology

[0002] Combined heat and power (CHP) technology using fuel cells is a promising distributed energy solution. It not only has the advantages of high efficiency, no pollution and low noise, but also makes full use of waste heat, which greatly improves the overall energy utilization rate and has attracted widespread attention worldwide.

[0003] Proton exchange membrane fuel cells (PEMFCs) use a proton-conducting polymer membrane as the electrolyte to convert the chemical energy of hydrogen into electrical energy, while simultaneously releasing heat. The theoretical efficiency can reach 94.5% (based on the lower calorific value of the fuel). Based on operating temperature, they are divided into low-temperature proton exchange membrane fuel cells (LT-PEMFCs) and high-temperature proton exchange membrane fuel cells (HT-PEMFCs), with operating temperature ranges of 60–80℃ and 120–200℃, respectively. Because the LT-PEMFC catalyst is intolerant to CO impurities and is prone to catalyst poisoning and deactivation, it requires a high-purity hydrogen supply (purity not less than 99.99%). The higher operating temperature of HT-PEMFCs allows the catalyst to tolerate CO concentrations up to 3% vol, significantly reducing dependence on high-purity hydrogen.

[0004] For the operation of fuel cell cogeneration systems, a stable hydrogen source is required. Currently, there are still many key issues to be resolved in the "hydrogen production-storage-transportation-refueling-use" technology chain, especially in terms of safety. High-pressure gaseous storage and transportation is the most commonly used method, but there is still considerable room for optimization in terms of safety, cost, and energy density. Due to the existence of the above issues, the safety of fuel cell cogeneration systems has been significantly affected. At the same time, existing fuel cell cogeneration systems also suffer from low energy utilization and do not make good use of waste heat in the system. Summary of the Invention

[0005] To address the problems existing in the prior art, this invention provides an integrated methanol-to-hydrogen and high-low temperature fuel cell cogeneration system. It couples methanol-to-hydrogen, HT-PEMFC power generation, and LT-PEMFC power generation to achieve cogeneration, which can reduce the dependence of the fuel cell CHP system on high-purity hydrogen and improve the energy utilization rate of the system.

[0006] The technical solution of the present invention is as follows:

[0007] In a first aspect of the present invention, an integrated methanol-to-hydrogen and high- and low-temperature fuel cell cogeneration system is provided, comprising a methanol reforming hydrogen production module, a low-temperature fuel cell module, and a high-temperature fuel cell module.

[0008] The hydrogen used in the low-temperature fuel cell module comes from a hydrogen storage tank, while the hydrogen used in the high-temperature fuel cell module comes from a methanol reforming hydrogen production module. The exhaust gases generated by the low-temperature and high-temperature fuel cell modules are burned in a burner to provide heat to the methanol reforming hydrogen production module. The low-temperature and high-temperature fuel cell modules supply power to the user side, and the heat generated by the high-temperature and low-temperature fuel cell modules supplies heat to the user side.

[0009] In some embodiments of the present invention, the coolant outlet of the high-temperature fuel cell module is connected to the coolant inlet of the low-temperature fuel cell module via a preheater and a first heat exchanger, and the outlet of the low-temperature fuel cell module is connected to the coolant inlet of the high-temperature fuel cell module via a first cooling pump and a deionizer.

[0010] In some embodiments of the present invention, the first heat exchanger is connected to a waste heat utilization component, which includes a hot water storage tank and radiators.

[0011] In some embodiments of the present invention, the cathode inlets of both the low-temperature fuel cell module and the high-temperature fuel cell module are connected to an air source via pipes, and air filters and compressors are installed on the pipes.

[0012] In some embodiments of the present invention, the cathode outlet and anode outlet of the fuel cell stack of the low-temperature fuel cell module and the high-temperature fuel cell module are both connected to the burner via pipes.

[0013] In some embodiments of the present invention, a first steam-water separator is provided on the pipe connecting the stack anode outlet of the cryogenic fuel cell module to the burner.

[0014] In some embodiments of the present invention, the methanol reforming hydrogen production module includes a methanol-water solution storage tank, an evaporator, and a reformer connected in sequence, wherein the evaporator and the reformer are respectively connected to the gas outlet of the burner.

[0015] In some embodiments of the present invention, the gas outlet of the reformer is connected to the anode inlet of the high-temperature fuel cell stack via a second heat exchanger and a second steam-water separator.

[0016] In some embodiments of the present invention, the second heat exchanger is also connected to a waste heat recovery assembly, which includes an expander, an air-cooled condenser, and a working fluid pump connected in sequence. The second heat exchanger and the waste heat recovery assembly form a circulation system, and the expander is connected to a generator.

[0017] In a second aspect of the present invention, a method for integrating methanol-to-hydrogen production with high- and low-temperature fuel cell cogeneration is provided, comprising the following steps:

[0018] The hydrogen storage tank provides high-purity hydrogen to the cryogenic fuel cell module, while the hydrogen produced by the methanol reforming hydrogen production module is supplied to the high-temperature fuel cell module. The electricity generated by the cryogenic and high-temperature fuel cell modules is supplied to the user side, and the heat generated by the cryogenic and high-temperature fuel cell modules during operation is used to the user side, realizing combined heat and power.

[0019] One or more technical solutions of the present invention have the following beneficial effects:

[0020] (1) The cogeneration system provided by the present invention can realize cogeneration by integrating methanol reforming hydrogen production module, high temperature PEMFC module and low temperature PEMFC module. At the same time, it reduces the dependence on high purity hydrogen, improves the safety of system operation, and improves the energy utilization rate by recovering and utilizing coolant and waste heat of fuel cell tail gas, thereby improving the flexibility and stability of cogeneration system.

[0021] (2) The cogeneration system provided by the present invention is equipped with a high-temperature PEMFC module and a low-temperature PEMFC module. The methanol reforming hydrogen production module provides hydrogen to the high-temperature PEMFC module which is not highly dependent on hydrogen, and provides high-purity hydrogen to the low-temperature PEMFC module which is highly dependent on hydrogen, thereby reducing the use of high-purity hydrogen in the entire system and reducing the cost of hydrogen use.

[0022] (3) The cogeneration system provided by the present invention performs coordinated thermal management of the high-temperature PEMFC module and the low-temperature PEMFC module. By adjusting the flow rates of the first cooling pump and the second cooling pump, the heat dissipation of the two fuel cells is matched, thereby improving the power generation efficiency of the high-temperature PEMFC module and the low-temperature PEMFC module. At the same time, the heat generated by the two fuel cells is recovered together through the heat exchanger, thereby improving the heat recovery efficiency.

[0023] (4) The cogeneration system provided by the present invention can switch between various operating conditions as needed, such as LT-PEMFC module operating alone, dual system operating simultaneously with only LT-PEMFC module requiring humidification, and dual system operating simultaneously with both requiring humidification, thereby improving the flexibility of system use.

[0024] (5) The cogeneration system provided by the present invention can fully recover the waste heat generated in the system, including the recovery of high-temperature exhaust gas from the burner and the recovery of heat from the coolant. The high-temperature exhaust gas generated by the burner provides waste heat drive for the methanol reforming hydrogen production module to realize methanol steam reforming. The heat of the battery stack carried away by the coolant is not only used to heat the anode inlet of the HT-PEMFC battery stack, but also to provide heat to the user side, thereby improving the energy utilization rate of the entire system. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the system structure principle of the present invention;

[0026] Figure 2 This is a schematic diagram illustrating the user-side waste heat utilization principle of the present invention;

[0027] Figure 3 This is a schematic diagram illustrating the waste heat recovery principle of the present invention.

[0028] In the diagram: 1. Air filter, 2. Compressor, 3. First three-way regulating valve, 4. Humidifier, 5. Second three-way regulating valve, 6. Third three-way regulating valve, 7. LT-PEMFC fuel cell stack, 7a. LT-PEMFC fuel cell stack cathode inlet, 7b. LT-PEMFC fuel cell stack anode inlet, 7c. LT-PEMFC fuel cell stack anode outlet, 7d. LT-PEMFC fuel cell stack cathode outlet, 7e. LT-PEMFC fuel cell stack coolant outlet, 7f. LT-PEMFC 8. Fuel cell stack coolant inlet, 9. Hydrogen storage tank, 10. Pressure reducing valve, 11. Fourth three-way regulating valve, 12. Fifth three-way regulating valve, 13. Hydrogen circulation pump, 14. First gas-liquid separator, 15. First cooling pump, 16. Deionizer, 16a. HT-PEMFC fuel cell stack cathode inlet, 16b. HT-PEMFC fuel cell stack anode inlet, 16c. HT-PEMFC fuel cell stack coolant outlet, 16d. HT-PEMFC fuel cell stack coolant outlet. Inlet, 16e. HT-PEMFC stack cathode outlet, 16f. HT-PEMFC stack anode outlet, 17. Preheater, 18. First heat exchanger, 19. Sixth three-way regulating valve, 20. Second cooling pump, 21. DC-DC converter, 22. Seventh three-way regulating valve, 23. Eighth three-way regulating valve, 24. Burner, 25. Ninth three-way regulating valve, 26. Methanol-water solution storage tank, 27. Feed pump, 28. Evaporator, 29. Reformer, 30. Second heat exchanger 31. Second steam-water separator; 32. Waste heat recovery assembly; 33. First water circulation pump; 34. Hot water storage tank; 34a. Hot water storage tank heat source side inlet; 34b. Hot water storage tank heat source side outlet; 34c. Hot water storage tank heating side outlet; 34d. Hot water storage tank heating side inlet; 34e. Hot water storage tank hot water outlet; 35. Generator; 36. Expander; 37. Air-cooled condenser; 38. Working fluid pump; 39. Second water circulation pump; 40. Radiator; 41. Regulating valve. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0030] Example 1

[0031] Currently, methanol steam reforming hydrogen production technology is relatively mature. Methanol has high liquid energy density, mature production process, and high safety and cost advantages in production, transportation, refueling and storage. Combining online hydrogen production technology and fuel cell technology to build an efficient and safe CHP system layout is highly feasible.

[0032] Therefore, in a typical embodiment of the present invention, an integrated methanol-to-hydrogen and high / low temperature fuel cell combined heat and power system is proposed, comprising a methanol reforming hydrogen production module, a low-temperature fuel cell module, and a high-temperature fuel cell module; the hydrogen used in the low-temperature fuel cell module comes from a hydrogen storage tank, and the hydrogen used in the high-temperature fuel cell module comes from the methanol reforming hydrogen production module; the exhaust gas generated by the low-temperature fuel cell module and the high-temperature fuel cell module is burned in a burner to provide heat to the methanol reforming hydrogen production module; power is supplied to the user side through the low-temperature fuel cell module and the high-temperature fuel cell module, and the heat generated by the high-temperature fuel cell module and the low-temperature fuel cell module is used to supply heat to the user side.

[0033] Taking a combined heat and power system (CHP) system that uses proton exchange membrane batteries in both low-temperature and high-temperature fuel cell modules as an example, the schematic diagram is as follows: Figure 1 As shown, the low-temperature fuel cell module includes an LT-PEMFC stack 7, which is provided with an LT-PEMFC stack cathode inlet 7a, an LT-PEMFC stack anode inlet 7b, an LT-PEMFC stack anode outlet 7c, an LT-PEMFC stack cathode outlet 7d, an LT-PEMFC stack coolant outlet 7e, and an LT-PEMFC stack coolant inlet 7f; the high-temperature fuel cell module includes an HT-PEMFC stack 16, which is provided with an HT-PEMFC stack cathode inlet 16a, an HT-PEMFC stack anode inlet 16b, an HT-PEMFC stack coolant outlet 16c, an HT-PEMFC stack coolant inlet 16d, an HT-PEMFC stack cathode outlet 16e, and an HT-PEMFC stack anode outlet 16f.

[0034] Air filter 1 inlet is connected to the external environment, air filter 1 outlet is connected to compressor 2 inlet, compressor 2 outlet is connected to first three-way regulating valve 3, first three-way regulating valve 3 splits into two paths, one path is connected to third three-way regulating valve 6, the other path is connected to humidifier 4 inlet, humidifier 4 outlet is connected to second three-way regulating valve 5, second three-way regulating valve 5 splits into two paths, one path is connected to third three-way regulating valve 6, the other path is connected to LT-PEMFC stack cathode inlet 7a, LT-PEMFC stack cathode outlet 7d is connected to first steam-water separator 13 inlet, first steam-water separator 13... The outlet of water separator 13 is connected to the seventh three-way regulating valve 22. The outlet of hydrogen storage tank 8 is connected to pressure reducing valve 9. Pressure reducing valve 9 is connected to the fourth three-way regulating valve 10. The fourth three-way regulating valve 10 is connected to the anode inlet 7b of the LT-PEMFC stack. The anode outlet 7c of the LT-PEMFC stack is connected to the fifth three-way regulating valve 11. The fifth three-way regulating valve 11 is divided into two paths: one path is connected to the eighth three-way regulating valve 23, and the other path is connected to the inlet of hydrogen circulation pump 12. The outlet of hydrogen circulation pump 12 is connected to the fourth three-way regulating valve 10. The eighth three-way regulating valve 23 is connected to the burner 24.

[0035] Air is filtered by air filter 1 and pressurized by compressor 2, then flows into humidifier 4 via first three-way regulating valve 3, and into LT-PEMFC stack cathode inlet 7a via second three-way regulating valve 5. Hydrogen starts from hydrogen storage tank 8, is pressurized by pressure reducing valve 9, and flows into LT-PEMFC stack anode inlet 7b via fourth three-way regulating valve 10. After energy conversion, the stack cathode exhaust gas is discharged from LT-PEMFC stack cathode outlet 7d, and enters burner 24 via first steam-water separator 13 and seventh three-way regulating valve 22. The stack anode exhaust gas is discharged from LT-PEMFC stack anode outlet 7c and split via fifth three-way regulating valve 11. One path flows through hydrogen circulation pump 12 into fourth three-way regulating valve 10, and the other path flows through eighth three-way regulating valve 23 into burner 24.

[0036] Furthermore, the outlet of the methanol-water solution storage tank 26 is connected to the inlet of the feed pump 27, the outlet of the feed pump 27 is connected to the cold-side inlet of the evaporator 28, the cold-side outlet of the evaporator 28 is connected to the inlet of the reformer 29, the outlet of the reformer 29 is connected to the hot-side inlet of the second heat exchanger 30, and the hot-side outlet of the second heat exchanger 30 is connected to the inlet of the second steam-water separator 31. Furthermore, the cold-side inlet of the preheater 17 is connected to the outlet of the second steam-water separator 31, the cold-side outlet of the preheater 17 is connected to the anode inlet 16b of the HT-PEMFC fuel cell stack, the anode outlet 16f of the HT-PEMFC fuel cell stack is connected to the eighth three-way regulating valve 23, the third three-way regulating valve 06 is connected to two input terminals, respectively connected to the first three-way regulating valve 03 and the second three-way regulating valve 05, the output terminal of the third three-way regulating valve 6 is connected to the cathode inlet 16a of the HT-PEMFC fuel cell stack, and the cathode outlet 16e of the HT-PEMFC fuel cell stack is connected to the seventh three-way regulating valve 22.

[0037] The raw material for the methanol-to-hydrogen module originates from the methanol-water solution storage tank 26, undergoes methanol-water vapor reforming via the raw material pump 27, evaporator 28, and reformer 29, is cooled on the hot side by the second heat exchanger 30, and then dehydrated by the second steam-water separator 31 to obtain hydrogen-containing converted gas usable by the HT-PEMFC stack. The hydrogen-containing converted gas from the outlet of the second steam-water separator 31 is preheated on the cold side by the preheater 17 and enters the anode of the HT-PEMFC stack. The air from the outlet of the compressor 2 flows into the cathode of the HT-PEMFC stack via the first three-way regulating valve 3 and the third three-way regulating valve 6. After energy conversion, the tail gas from the cathode of the HT-PEMFC stack is discharged from the cathode outlet 16e and enters the burner 24 via the seventh three-way regulating valve 22. The tail gas from the anode of the HT-PEMFC stack is discharged from the anode outlet f and enters the burner 24 via the eighth three-way regulating valve 23, thus treating unreacted gases.

[0038] The outlet of the second steam-water separator 31 is connected to the cold side inlet of the preheater 17, and the cold side outlet of the preheater 17 is connected to the anode inlet 16b of the HT-PEMFC stack, so as to utilize the residual heat of the hot side coolant to preheat the anode intake gas.

[0039] Furthermore, the LT-PEMFC stack 7 and HT-PEMFC stack 16 perform coordinated thermal management. The LT-PEMFC stack coolant outlet 7e is connected to the inlet of the first cooling pump 14, the outlet of the first cooling pump 14 is connected to the inlet of the deionizer 15, the outlet of the deionizer 15 is connected to the HT-PEMFC stack coolant inlet 16d, the HT-PEMFC stack coolant outlet 16c is connected to the hot side inlet of the preheater 17, the hot side outlet of the preheater 17 is connected to the hot side inlet of the first heat exchanger 18, and the hot side outlet of the first heat exchanger 18 is connected to the sixth three-way regulating valve 19. The sixth three-way regulating valve 19 is divided into two paths: one path is connected to the LT-PEMFC stack coolant inlet 7f, and the other path is connected to the inlet of the second cooling pump 20. The coolant outlet of the second cooling pump 20 merges with the coolant outlet of the first cooling pump 14 and is connected to the inlet of the deionizer 15. By adjusting the flow rates of the first cooling pump 14 and the second cooling pump 20, the heat dissipation of the two stacks is matched.

[0040] The coolant generated by the LT-PEMFC stack 7 flows into the HT-PEMFC stack 16 via the first cooling pump 14 and deionizer 15, and then circulates back to the LT-PEMFC stack 7 via the hot side of the preheater 17, the hot side of the first heat exchanger 18, and the sixth three-way regulating valve 19. When the heat dissipation requirements of the two stacks are not coordinated, part of the coolant flows through the sixth three-way regulating valve 19 and the second cooling pump 20 to merge with the coolant at the outlet of the first cooling pump 14. By controlling the flow rates of the first cooling pump 14 and the second cooling pump 20, the heat dissipation of the stacks can be flexibly coordinated.

[0041] Furthermore, the first heat exchanger 18 is connected to a waste heat utilization component, which includes a hot water storage tank 34 and radiators 40, specifically as follows: Figure 2 As shown, the hot water storage tank's heat source side outlet 34b is connected to the inlet of the first water circulation pump 33, the outlet of the first water circulation pump 33 is connected to the cold side inlet of the first heat exchanger 18, and the cold side outlet of the first heat exchanger 18 is connected to the hot water storage tank's heat source side inlet 34a, realizing the recovery of waste heat from the hot side coolant to the hot water storage tank. The hot water storage tank's heating side outlet 34c is connected to the inlet of the second water circulation pump 39, the outlet of the second water circulation pump 39 is connected to the inlet of the radiator 40, and the outlet of the radiator 40 is connected to the hot water storage tank's heating side inlet 34d, realizing the heating supply to the user side. The hot water storage tank's hot water outlet 34e is connected to the regulating valve 41, realizing the hot water supply.

[0042] Furthermore, the outlet of burner 24 is connected to the ninth three-way regulating valve 25, which has two outlets, connected to the cold side inlet of evaporator 28 and the heating side inlet of reformer 29 respectively, so as to realize the use of waste heat to drive methanol steam reforming.

[0043] Furthermore, the second heat exchanger 30 is also connected to a waste heat recovery assembly, such as... Figure 3 As shown, the cold-side outlet of the second heat exchanger 30 is connected to the inlet of the expander 36, the outlet of the expander 36 is connected to the inlet of the air-cooled condenser 37, the expander 36 is coaxially connected to the generator 35, the outlet of the air-cooled condenser 37 is connected to the inlet of the working fluid pump 38, and the outlet of the working fluid pump 38 is connected to the cold-side inlet of the second heat exchanger 39, thereby realizing the recovery of waste heat from the converted gas.

[0044] Furthermore, the LT-PEMFC stack 7 and the HT-PEMFC stack 16 are respectively connected to the DC-DC converter 21. The electrical energy generated by the LT-PEMFC stack 7 and the HT-PEMFC stack 16 is input into the DC-DC converter 21 to meet the power demand of the user side and the power equipment.

[0045] In this embodiment, the LT-PEMFC stack 7 and the HT-PEMFC stack 16 share an air source, and there are three air supply modes. In mode one, the air outlet of the compressor 2 is supplied entirely to the LT-PEMFC stack 7 via the first three-way regulating valve 3, the humidifier 4, and the second three-way regulating valve 5, which is suitable for the scenario where the LT-PEMFC system operates alone. In mode two, the air outlet of the compressor is split via the first three-way regulating valve 3. One path is supplied to the cathode of the LT-PEMFC stack via the humidifier 4 and the second three-way regulating valve 5, and the other path is supplied to the cathode of the HT-PEMFC stack via the third three-way regulating valve 6 and the cold side of the preheater 17, which is suitable for the scenario where the two systems operate simultaneously and only the LT-PEMFC system needs humidification. In mode three, the air outlet of the compressor 2, based on mode two, is partially bypassed to the third three-way regulating valve 6 via the second three-way regulating valve 3, which is suitable for the scenario where the two systems operate simultaneously and both need humidification.

[0046] In this embodiment, the waste heat recovery system comprises three parts. Part one: the HT-PEMFC stack anode inlet gas passes through the cold side of the preheater 17 to recover part of the coolant waste heat. Part two: water passes through the hot water storage tank 34 heat source side outlet, the first water circulation pump 33, the cold side of the first heat exchanger 18, and the hot water storage tank 34 heat source side inlet, and the coolant waste heat is recovered to the hot water storage tank 34. Part three: the high-temperature exhaust gas from the burner 24 is split through the ninth three-way regulating valve 25, one path connecting to the hot side inlet of the evaporator 28, and the other path connecting to the reformer 29, and the waste heat is used for methanol-to-hydrogen production. As an optional implementation, the cold side of the second heat exchanger 30 is connected to the waste heat recovery component, and the working fluid flows out from the cold side outlet of the evaporator 28, passes through the expander 36, the air-cooled condenser 37, and the working fluid pump 38, and circulates back to the cold side inlet of the evaporator 28. The expander 36 drives the generator to generate electricity, thereby realizing the recovery of the reformed gas waste heat.

[0047] Example 2

[0048] In a typical embodiment of the present invention, a method for integrating methanol-to-hydrogen and high- and low-temperature fuel cell cogeneration is proposed, comprising the following steps:

[0049] The hydrogen storage tank provides high-purity hydrogen to the cryogenic fuel cell module, while the hydrogen produced by the methanol reforming hydrogen production module is supplied to the high-temperature fuel cell module. The electricity generated by the cryogenic and high-temperature fuel cell modules is supplied to the user side, and the heat generated by the cryogenic and high-temperature fuel cell modules during operation is used to the user side, realizing combined heat and power.

[0050] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. A combined methanol-to-hydrogen and high / low temperature fuel cell cogeneration system, characterized in that, This includes a methanol reforming hydrogen production module, a low-temperature fuel cell module, and a high-temperature fuel cell module; The hydrogen used in the low-temperature fuel cell module comes from a hydrogen storage tank, and the hydrogen used in the high-temperature fuel cell module comes from a methanol reforming hydrogen production module. The exhaust gas generated by the low-temperature fuel cell module and the high-temperature fuel cell module is burned by a burner to provide heat to the methanol reforming hydrogen production module. The low-temperature fuel cell module and the high-temperature fuel cell module provide power to the user side, and the heat generated by the high-temperature fuel cell module and the low-temperature fuel cell module provides heat to the user side. The coolant outlet of the high-temperature fuel cell module is connected to the coolant inlet of the low-temperature fuel cell module via a preheater and a first heat exchanger. The coolant outlet of the low-temperature fuel cell module is connected to the coolant inlet of the high-temperature fuel cell module via a first cooling pump and a deionizer. The cathode outlet and anode outlet of both the low-temperature fuel cell module and the high-temperature fuel cell module are connected to the burner via pipes.

2. The integrated methanol-to-hydrogen and high / low temperature fuel cell cogeneration system as described in claim 1, characterized in that, The first heat exchanger is connected to a waste heat utilization component, which includes a hot water storage tank and radiators.

3. The integrated methanol-to-hydrogen and high / low temperature fuel cell cogeneration system as described in claim 1, characterized in that, The cathode inlets of both the low-temperature fuel cell module and the high-temperature fuel cell module are connected to an air source via pipes, and air filters and compressors are installed on the pipes.

4. The integrated methanol-to-hydrogen and high / low temperature fuel cell cogeneration system as described in claim 1, characterized in that, A first steam-water separator is installed on the pipe connecting the stack anode outlet of the cryogenic fuel cell module to the burner.

5. The integrated methanol-to-hydrogen and high / low temperature fuel cell cogeneration system as described in claim 1, characterized in that, The methanol reforming hydrogen production module includes a methanol-water solution storage tank, an evaporator, and a reformer connected in sequence. The evaporator and the reformer are respectively connected to the gas outlet of the burner.

6. The integrated methanol-to-hydrogen and high / low temperature fuel cell cogeneration system as described in claim 5, characterized in that, The gas outlet of the reformer is connected to the anode inlet of the high-temperature fuel cell stack via a second heat exchanger and a second steam-water separator.

7. The integrated methanol-to-hydrogen and high / low temperature fuel cell cogeneration system as described in claim 6, characterized in that, The second heat exchanger is also connected to a waste heat recovery assembly, which includes an expander, an air-cooled condenser, and a working fluid pump connected in sequence. The second heat exchanger and the waste heat recovery assembly form a circulation system, and the expander is connected to a generator.

8. A method for integrating methanol-to-hydrogen and high / low temperature fuel cell cogeneration, employing the cogeneration system as described in any one of claims 1-7, characterized in that, Includes the following steps: The hydrogen storage tank provides high-purity hydrogen to the cryogenic fuel cell module, while the hydrogen produced by the methanol reforming hydrogen production module is supplied to the high-temperature fuel cell module. The electricity generated by the cryogenic and high-temperature fuel cell modules is supplied to the user side, and the heat generated by the cryogenic and high-temperature fuel cell modules during operation is used to the user side, realizing combined heat and power.

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