An electroless auxiliary type medium temperature reaction stack

Abstract

The present application relates to the field of electric pile system, especially to a non-electric auxiliary medium-temperature reaction electric pile. Before the electric pile starts, the first combustion methanol path and the first combustion air path provide energy for the circulating medium heating unit combustion, the heat generated by the circulating medium heating unit combustion is transmitted to the electric pile through the heat exchange connection with the electric pile to meet the electric pile starting adjustment, and then after the electric pile starts, the second combustion methanol path and the second combustion air path provide heat for the methanol water reforming in the reforming reaction unit, the hydrogen generated by the reforming reaction is transported to the electric pile, and the electrode air path provides oxygen for the electric pile reaction. After the electric pile starts normally, a large amount of heat is generated by the electric pile reaction, at this time, the combustion area of the circulating medium heating unit is closed and is changed into a heat dissipation function to avoid overheating of the electric pile. The whole system can realize self-starting without electric auxiliary heating. The scheme can not only simplify the complexity of the system, but also realize more efficient, environmentally friendly and economic energy utilization.

Description

Technical Field

[0001] This invention relates to the field of fuel cell systems, and more particularly to a non-electrically assisted intermediate-temperature reactor fuel cell. Background Technology

[0002] The methanol reforming process for hydrogen production involves multiple steps. First, methanol and water are mixed in a specific ratio, and then the mixture is fed into a reforming reaction unit. Within this unit, methanol and water undergo a reforming reaction under the action of a catalyst, producing a gaseous mixture containing hydrogen. This hydrogen-containing gaseous mixture then undergoes a series of purification steps. An electric fuel cell stack is a device that directly converts chemical energy into electrical energy. In the stack, hydrogen combines with oxygen through an electrochemical reaction to produce electricity and water. However, during the initial startup phase, the stack's stability is not ideal due to its relatively low operating temperature. To ensure a smooth startup and optimal operating condition, preheating is typically required. Currently, the common preheating method is to heat the stack using electric heating technology. However, this method has some drawbacks, such as increasing the complexity of the entire system structure and rendering the electric heating components redundant after the stack has started normally.

[0003] Therefore, researchers are seeking a new technological solution to achieve the goal of starting up the fuel cell stack without electrical heating. This solution would not only simplify the system's complexity but also avoid the idleness of the electrically heated components after the stack starts up, thereby improving the overall system efficiency and economy. In this way, more efficient, environmentally friendly, and economical hydrogen energy utilization can be achieved. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an electric auxiliary medium-temperature reactor stack, thereby solving the problem of complex reactor stack systems.

[0005] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: A non-electrically assisted medium-temperature reactor stack includes a reforming methanol water circuit, a first combustion methanol circuit, a second combustion methanol circuit, a circulating water circuit, a first combustion air circuit, a second combustion air circuit, an electrode air circuit, a reforming reaction unit, a reactor stack, and a circulating medium heating unit. The circulating medium heating unit is connected to the reactor stack via a heat exchange component. The reforming zone outlet of the reforming reaction unit is connected to the reactor stack. The combustion zone of the reforming reaction unit is connected to the second combustion methanol circuit and the second combustion air circuit, respectively. The reforming zone inlet of the reforming reaction unit is connected to the reforming methanol water circuit. The combustion zone of the circulating medium heating unit is connected to the first combustion air circuit and the first combustion methanol circuit, respectively. The electrode air circuit is connected to the reactor stack.

[0006] Furthermore, the exhaust port of the fuel cell stack is connected to the combustion zone of the reforming reaction unit, and a second check valve is installed on the pipeline connecting the exhaust port of the fuel cell stack to the combustion zone of the reforming reaction unit.

[0007] Furthermore, the circulating water circuit includes an air-cooled condenser, a heat circulation pump, and a first plate heat exchanger, and the circulating medium heating unit, air-cooled condenser, heat circulation pump, fuel cell stack, and first plate heat exchanger are connected in sequence to form a circulating connection.

[0008] Furthermore, the electrode air path includes a cathode air filter, a cathode fan, and a cathode check valve connected in sequence. The cathode check valve is connected to the fuel cell stack, and the pipeline connecting the cathode check valve and the fuel cell stack is connected to the first plate heat exchanger for heat exchange.

[0009] Furthermore, the first methanol combustion circuit includes a first methanol tank and a combustion pump, and the first methanol tank is connected to the combustion zone of the circulating medium heating unit through the combustion pump.

[0010] Furthermore, the second methanol combustion path includes a second methanol tank, a first reforming pump, and a first check valve connected in sequence. The first check valve is connected to the combustion zone of the reforming reaction unit, and the pipeline connecting the first check valve to the combustion zone of the reforming reaction unit is connected to the circulating medium heating unit for heat exchange.

[0011] Furthermore, the reformed methanol water circuit includes a methanol water tank, a second reforming pump, and a second plate heat exchanger arranged in sequence. The second plate heat exchanger is connected to the reforming zone inlet of the reforming reaction unit. The tail gas of the reforming reaction unit is connected to the second plate heat exchanger through a pipeline and then connected to a water recovery condenser.

[0012] Furthermore, the first combustion air path includes a first air filter and a first combustion fan arranged in sequence, and the first combustion fan is connected to the combustion zone of the circulating medium heating unit.

[0013] Furthermore, the second combustion air path includes a second air filter, a second combustion fan, and a third plate heat exchanger arranged in sequence. The third plate heat exchanger is connected to the combustion zone of the reforming reaction unit, and the exhaust gas outlet of the circulating medium heating unit is connected to the third plate heat exchanger for heat exchange through a pipeline.

[0014] This invention provides an electric auxiliary-free intermediate-temperature reactor stack, comprising a reforming methanol-water circuit, a first combustion methanol circuit, a second combustion methanol circuit, a circulating water circuit, a first combustion air circuit, a second combustion air circuit, an electrode air circuit, a reforming reaction unit, a reactor stack, and a circulating medium heating unit. The circulating medium heating unit is connected to the reactor stack via a heat exchange component. The reforming zone outlet of the reforming reaction unit is connected to the reactor stack. The combustion zone of the reforming reaction unit is connected to the second combustion methanol circuit and the second combustion air circuit, respectively. The reforming zone inlet of the reforming reaction unit is connected to the reforming methanol-water circuit. The combustion zone of the circulating medium heating unit is connected to the first combustion air circuit and the first combustion methanol circuit, respectively. The electrode air circuit is connected to the reactor stack. In this way, before the fuel cell stack starts up, the first combustion methanol path and the first combustion air path provide energy for the combustion of the circulating medium heating unit. The heat generated by the combustion of the circulating medium heating unit is transferred to the fuel cell stack through the heat exchange connection to meet the startup regulation of the fuel cell stack. After the fuel cell stack starts up, the second combustion methanol path and the second combustion air path provide heat for the reforming of methanol and water in the reforming reaction unit. The hydrogen produced by the reforming reaction is transported to the fuel cell stack. The electrode air path provides oxygen for the fuel cell stack reaction. After the fuel cell stack starts up normally, the fuel cell stack reaction generates a large amount of heat. At this time, the combustion zone of the circulating medium heating unit is shut down and converted to heat dissipation function to avoid overheating of the fuel cell stack. The entire system can achieve self-starting without electric auxiliary heating. This scheme can not only simplify the complexity of the system, but also improve the efficiency and economy of the entire system, and achieve more efficient, environmentally friendly and economical energy utilization. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the system principle of a non-electrically assisted intermediate-temperature reactor of the present invention.

[0016] The attached diagram lists the components represented by each number as follows:

[0017] 1. Fuel cell stack; 2. Reforming reaction unit; 3. Circulating medium heating unit; 4. Second check valve; 5. Air-cooled condenser; 6. Heat circulation pump; 7. First plate heat exchanger; 8. Cathode air filter; 9. Cathode fan; 10. Cathode check valve; 11. First methanol tank; 12. Combustion pump; 13. Second methanol tank; 14. First reforming pump; 15. First check valve; 16. Methanol water tank; 17. Second reforming pump; 18. Second plate heat exchanger; 19. Water recovery condenser; 20. First air filter; 21. First combustion fan; 22. Second air filter; 23. Second combustion fan; 24. Third plate heat exchanger. Detailed Implementation

[0018] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0019] In the description of this invention, it should be understood that the terms "upper", "lower", "center", "inner", "outer", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0020] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] like Figure 1As shown, this invention provides a non-electrically assisted medium-temperature fuel cell stack, comprising a reforming methanol-water circuit, a first combustion methanol circuit, a second combustion methanol circuit, a circulating water circuit, a first combustion air circuit, a second combustion air circuit, an electrode air circuit, a reforming reaction unit 2, a fuel cell stack 1, and a circulating medium heating unit 3. The circulating medium heating unit 3 is connected to the fuel cell stack 1 via a heat exchange component. The reforming zone outlet of the reforming reaction unit 2 is connected to the fuel cell stack 1. The combustion zone of the reforming reaction unit 2 is connected to the second combustion methanol circuit and the second combustion air circuit, respectively. The reforming zone inlet of the reforming reaction unit 2 is connected to the reforming methanol-water circuit. The combustion zone of the circulating medium heating unit 3 is connected to the first combustion air circuit and the first combustion methanol circuit, respectively. The electrode air circuit is connected to the fuel cell stack 1. Before the fuel cell stack 1 is started, the first combustion methanol circuit and the first combustion air circuit need to be started first, as these two systems will provide the necessary combustion energy for the circulating medium heating unit 3. The heat generated during combustion in the circulating medium heating unit 3 is effectively transferred to the fuel cell stack 1 through a heat exchange connection. This process is to meet the temperature regulation required for the startup of the fuel cell stack 1. Once the fuel cell stack 1 successfully starts up, the second combustion methanol path and the second combustion air path will be activated. These two systems will provide the necessary heat for the reforming reaction of methanol and water in the reforming reaction unit 2. The hydrogen produced by the reforming reaction will be supplied to the fuel cell stack 1 for its use. At the same time, the electrode air path will provide sufficient oxygen for the reaction in the fuel cell stack 1. When the fuel cell stack 1 enters normal operation, the reaction in the fuel cell stack 1 will generate a large amount of heat. At this time, we need to shut down the combustion zone of the circulating medium heating unit 3 and convert it to a heat dissipation function to prevent the fuel cell stack 1 from overheating. The entire system can still achieve self-starting without electric auxiliary heating. This design not only simplifies the complexity of the system but also significantly improves the efficiency and economy of the entire system. In this way, we can achieve more efficient, environmentally friendly, and economical energy utilization.

[0022] The electric auxiliary intertemperature reactor of the present invention, such as Figure 1As shown, based on the previously described technical solution, another option is to connect the exhaust gas outlet of the fuel cell stack 1 to the combustion zone of the reforming reaction unit 2, and install a second check valve 4 on the pipeline connecting the exhaust gas outlet of the fuel cell stack 1 to the combustion zone of the reforming reaction unit 2. In this way, by connecting the exhaust gas outlet of the fuel cell stack 1 to the combustion zone of the reforming reaction unit 2, the useful components in the exhaust gas can be reused. The exhaust gas typically contains unreacted hydrogen and other combustible gases, which can be sent to the combustion zone of the reforming reaction unit 2 for secondary combustion, thereby improving fuel utilization and the overall efficiency of the system. Furthermore, the second check valve 4 installed on the pipeline prevents the high-temperature gas in the combustion zone of the reforming reaction unit 2 from flowing back into the fuel cell stack 1, ensuring the safe operation of the fuel cell stack 1. This design not only optimizes energy use but also enhances the stability and safety of the system.

[0023] The electric auxiliary intertemperature reactor of the present invention, such as Figure 1 As shown, based on the previously described technical solution, the circulating water circuit can also include an air-cooled condenser 5, a heat circulation pump 6, and a first plate heat exchanger 7. The circulating medium heating unit 3, air-cooled condenser 5, heat circulation pump 6, fuel cell stack 1, and first plate heat exchanger 7 are sequentially connected to form a circulating connection. Thus, before starting the fuel cell stack 1, we need to shut down the air-cooled condenser 5. This is because we need the circulating medium heating unit 3 to start working and generate sufficient heat to provide the necessary thermal energy support for the startup of the fuel cell stack 1. Only after the entire system enters normal operating condition can we open the air-cooled condenser 5 and simultaneously shut down the circulating medium heating furnace. The purpose of this is to switch the system from heating mode to heat dissipation mode, thereby effectively dissipating the heat generated by the fuel cell stack 1 during the reaction process. In this way, we can ensure that the fuel cell stack 1 always operates within the optimal temperature range, thereby guaranteeing its efficient and stable operating performance.

[0024] The electric auxiliary intertemperature reactor of the present invention, such as Figure 1As shown, based on the previously described technical solution, the electrode air path can also be: the electrode air path includes a cathode air filter 8, a cathode fan 9, and a cathode check valve 10 connected in sequence. The cathode check valve 10 is connected to the fuel cell stack 1, and the pipeline connecting the cathode check valve 10 and the fuel cell stack 1 is connected to the first plate heat exchanger 7 for heat exchange. In this way, the electrode air path, through the sequentially connected cathode air filter 8, cathode fan 9, and cathode check valve 10, ensures clean and continuous air supply. The cathode air filter 8 first removes particulate matter from the air, ensuring the quality of the air entering the system and extending the service life of the fuel cell stack 1. The cathode fan 9 provides the necessary air pressure and flow rate to ensure that air can effectively pass through the fuel cell stack 1 to support the electrochemical reaction. The cathode check valve 10 prevents the backflow of gas in the fuel cell stack 1 in the event of system shutdown or failure, protecting the fuel cell stack 1 from damage. In addition, the pipeline connecting the cathode check valve 10 and the fuel cell stack 1 is connected to the first plate heat exchanger 7 for heat exchange. The air entering the fuel cell stack 1 can absorb part of the heat after the reaction in the fuel cell stack 1, thereby preheating the air and preventing the reaction efficiency of the fuel cell stack 1 from being affected by the low temperature of the air entering the fuel cell stack 1. This improves the energy efficiency of the entire system and also enhances the stability and safety of the system.

[0025] The electric auxiliary intertemperature reactor of the present invention, such as Figure 1 As shown, based on the previously described technical solution, the first methanol combustion circuit can also be configured as follows: the first methanol combustion circuit includes a first methanol tank 11 and a combustion pump 12, with the first methanol tank 11 connected to the combustion zone of the circulating medium heating unit 3 via the combustion pump 12. Thus, the design of the first methanol combustion circuit, by connecting the first methanol tank 11 to the combustion zone of the circulating medium heating unit 3 via the combustion pump 12, achieves efficient methanol combustion and rapid heat transfer. This structural design allows for a stable and continuous supply of methanol to the combustion zone, ensuring the stability and controllability of the combustion process. The use of the combustion pump 12 ensures precise control of the methanol delivery pressure and flow rate, thereby improving combustion efficiency and thermal energy utilization. Furthermore, the direct connection between the combustion zone and the methanol tank reduces intermediate steps, lowers system complexity, and improves system reliability and ease of maintenance. Overall, this working principle not only improves thermal energy conversion efficiency but also ensures the safe and stable operation of the system, demonstrating significant beneficial effects.

[0026] The electric auxiliary intertemperature reactor of the present invention, such as Figure 1As shown, based on the previously described technical solution, the second methanol combustion path can also be: The second methanol combustion path includes a second methanol tank 13, a first reforming pump 14, and a first check valve 15 connected in sequence. The first check valve 15 is connected to the combustion zone of the reforming reaction unit 2, and the pipeline connecting the first check valve 15 to the combustion zone of the reforming reaction unit 2 is connected to the circulating medium heating unit 3 for heat exchange. Thus, the second methanol combustion path, through the sequentially connected second methanol tank 13, first reforming pump 14, and first check valve 15, ensures a stable supply and delivery of methanol. The second methanol tank 13 stores methanol, the first reforming pump 14 pumps methanol into the system, and the first check valve 15 prevents reverse gas flow, ensuring the safe and smooth operation of the system. Furthermore, the first check valve 15's connection to the combustion zone of the reforming reaction unit 2 allows methanol to smoothly enter the combustion zone for combustion. The first check valve 15 is connected to the combustion zone of the reforming reaction unit 2 via a pipeline that is also connected to the circulating medium heating unit 3 for heat exchange. This absorbs the heat from the reaction of the fuel cell stack 1 into the circulating medium heating unit 3, ensuring that the methanol entering the reforming reaction unit 2 can be atomized and fully combusted, thereby further increasing energy utilization.

[0027] The electric auxiliary intertemperature reactor of the present invention, such as Figure 1 As shown, based on the previously described technical solution, the reformed methanol water circuit can also be configured as follows: the reformed methanol water circuit includes a methanol water tank 16, a second reforming pump 17, and a second plate heat exchanger 18 connected in sequence. The second plate heat exchanger 18 is connected to the inlet of the reforming zone of the reforming reaction unit 2. The tail gas of the reforming reaction unit 2 is connected to the second plate heat exchanger 18 via a pipeline and then connected to a water recovery condenser 19. Thus, the reformed methanol water circuit provided by this invention achieves high efficiency and energy saving through its working principle. The methanol water tank 16 serves as a raw material storage unit, ensuring a stable supply of the methanol-water mixture required for the reforming reaction. The second reforming pump 17 draws the methanol-water mixture from the methanol water tank 16 and provides the necessary pressure to ensure the mixture can smoothly pass through the entire system. The second plate heat exchanger 18 utilizes the heat from the tail gas of the reforming reaction unit 2 to preheat the methanol-water mixture, thereby reducing the energy consumption required by the reforming reaction unit 2 and improving the thermal efficiency of the entire system. The tail gas from reforming reaction unit 2 is connected to the second plate heat exchanger 18, which not only recovers the heat from the tail gas but also further recovers the water vapor through the water recovery condenser 19, achieving resource recycling and reducing raw material consumption. Overall, this valve stem achieves efficient energy utilization and environmental sustainability through optimized design of the reformed methanol water circuit.

[0028] The electric auxiliary intertemperature reactor of the present invention, such as Figure 1As shown, based on the technical solution described above, the first combustion air path can also be: the first air filter 20 and the first combustion fan 21 are connected in sequence, and the first combustion fan 21 is connected to the combustion zone of the circulating medium heating unit 3. In this way, the design of the first combustion air path, through the sequentially connected first air filter 20 and first combustion fan 21, ensures that the air used during combustion is purified, thereby avoiding the negative impact of dust and other particulate matter on combustion efficiency and combustion quality. The first air filter 20 first removes impurities from the air, ensuring the quality of the air entering the combustion zone, while the first combustion fan 21 provides the necessary air pressure and air volume, ensuring sufficient air supply to the combustion zone. This working principle not only improves combustion efficiency but also reduces pollutant emissions, while ensuring the stable operation of the circulating medium heating unit 3 and extending the service life of the equipment.

[0029] The electric auxiliary intertemperature reactor of the present invention, such as Figure 1 As shown, based on the previously described technical solution, the second combustion air path can also be: the second combustion air path includes a second air filter 22, a second combustion fan 23, and a third plate heat exchanger 24 arranged in sequence. The third plate heat exchanger 24 is connected to the combustion zone of the reforming reaction unit 2, and the exhaust gas outlet of the circulating medium heating unit 3 is connected to the third plate heat exchanger 24 via a pipeline for heat exchange. Thus, by designing the second combustion air path, including the sequential connection of the second air filter 22, the second combustion fan 23, and the third plate heat exchanger 24, effective filtration and forced air supply to the air entering the combustion zone are achieved, ensuring the stability and efficiency of the combustion process. The second air filter 22 ensures air cleanliness, avoiding interference from dust and other impurities in the combustion process, while the second combustion fan 23 provides the necessary airflow, ensuring the oxygen supply required for combustion. The third plate heat exchanger 24 is connected to the combustion zone of the reforming reaction unit 2, enabling the effective utilization of the heat generated by combustion. The heat is transferred through the third plate heat exchanger 24 to the air entering the reforming reaction unit 2, thereby improving the overall system thermal efficiency. This design not only improves combustion efficiency and thermal energy utilization but also ensures stable system operation and environmental cleanliness, resulting in significant economic and environmental benefits.

[0030] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A non-electrically assisted intermediate-temperature reactor stack, characterized in that: The system includes a reforming methanol water circuit, a first combustion methanol circuit, a second combustion methanol circuit, a circulating water circuit, a first combustion air circuit, a second combustion air circuit, an electrode air circuit, a reforming reaction unit (2), an electric stack (1), and a circulating medium heating unit (3). The circulating medium heating unit (3) is connected to the electric stack (1) through a heat exchange component. The reforming zone outlet of the reforming reaction unit (2) is connected to the electric stack (1). The combustion zone of the reforming reaction unit (2) is connected to the second combustion methanol circuit and the second combustion air circuit, respectively. The reforming zone inlet of the reforming reaction unit (2) is connected to the reforming methanol water circuit. The combustion zone of the circulating medium heating unit (3) is connected to the first combustion air circuit and the first combustion methanol circuit, respectively. The electrode air circuit is connected to the electric stack (1).

2. The non-electrically assisted intermediate-temperature reactor stack according to claim 1, characterized in that: The exhaust port of the fuel cell stack (1) is connected to the combustion zone of the reforming reaction unit (2), and a second check valve (4) is provided on the pipeline connecting the exhaust port of the fuel cell stack (1) to the combustion zone of the reforming reaction unit (2).

3. The non-electrically assisted intermediate-temperature reactor stack according to claim 1, characterized in that: The circulating water circuit includes an air-cooled condenser (5), a heat circulation pump (6), and a first plate heat exchanger (7). The circulating medium heating unit (3), the air-cooled condenser (5), the heat circulation pump (6), the fuel cell stack (1), and the first plate heat exchanger (7) are connected in sequence to form a circulating connection.

4. The non-electrically assisted intermediate-temperature reactor stack according to claim 3, characterized in that: The electrode air path includes a cathode air filter (8), a cathode fan (9), and a cathode check valve (10) connected in sequence. The cathode check valve (10) is connected to the fuel cell stack (1), and the pipeline connecting the cathode check valve (10) and the fuel cell stack (1) is connected to the first plate heat exchanger (7) for heat exchange.

5. The non-electrically assisted intermediate-temperature reactor stack according to claim 1, characterized in that: The first methanol combustion circuit includes a first methanol tank (11) and a combustion pump (12). The first methanol tank (11) is connected to the combustion zone of the circulating medium heating unit (3) through the combustion pump (12).

6. The non-electrically assisted intermediate-temperature reactor stack according to claim 1, characterized in that: The second methanol combustion path includes a second methanol tank (13), a first reforming pump (14) and a first check valve (15) connected in sequence. The first check valve (15) is connected to the combustion zone of the reforming reaction unit (2), and the pipeline connecting the first check valve (15) to the combustion zone of the reforming reaction unit (2) is connected to the circulating medium heating unit (3) for heat exchange.

7. The non-electrically assisted intermediate-temperature reactor stack according to claim 1, characterized in that: The reformed methanol water circuit includes a methanol water tank (16), a second reforming pump (17), and a second plate heat exchanger (18) connected in sequence. The second plate heat exchanger (18) is connected to the reforming zone inlet of the reforming reaction unit (2). The tail gas of the reforming reaction unit (2) is connected to the second plate heat exchanger (18) through a pipeline and connected to a water recovery condenser (19).

8. The non-electrically assisted intermediate-temperature reactor stack according to claim 1, characterized in that: The first combustion air path includes a first air filter (20) and a first combustion fan (21) connected in sequence, and the first combustion fan (21) is connected to the combustion zone of the circulating medium heating unit (3).

9. The non-electrically assisted intermediate-temperature reactor stack according to claim 1, characterized in that: The second combustion air path includes a second air filter (22), a second combustion fan (23), and a third plate heat exchanger (24) arranged in sequence. The third plate heat exchanger (24) is connected to the combustion zone of the reforming reaction unit (2), and the exhaust gas outlet of the circulating medium heating unit (3) is connected to the third plate heat exchanger (24) through a pipeline for heat exchange.

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