A mild controllable hydrogen production and heat power combined device by magnesium hydride hydrolysis

Abstract

A mild and controllable magnesium hydride hydrolysis hydrogen production thermoelectric combined unit includes a hydrogen production module, a fuel cell power generation module, a heat recovery module, and a control module. The hydrogen production module includes a reactor, a water tank, a water pump, and a cooling system. The outlet of the water tank is connected to the inlet of the water pump via a pipe. The outlet of the water pump is connected to the reactor via a first multi-channel valve group and several inlet pipes. Each inlet pipe enters the reactor and extends to the bottom. Several through holes are arranged axially and circumferentially in the side wall of the inlet pipe, and magnesium hydride solid fuel and temperature sensors are arranged around the through holes. This invention precisely controls the amount of water pumped into the reactor containing magnesium hydride solid fuel according to demand, thereby controlling the hydrogen production rate. This invention controls the temperature through the cooling system and recovers the heat generated during the hydrolysis reaction through the heat recovery device, which can further improve the energy utilization efficiency of the system.

Description

Technical Field

[0001] This invention relates to the field of chemistry, and more particularly to hydrogen production equipment, especially a mild and controllable thermoelectric combined unit for producing hydrogen by magnesium hydride hydrolysis. Background Technology

[0002] Proton exchange membrane fuel cells (PEMFCs) are devices that directly convert the chemical energy of hydrogen and oxygen in the air into electrical energy. They offer advantages such as high conversion efficiency, zero pollution, low noise, and high safety and reliability, and have been widely used in various fields. Solid-state hydrogen storage, as a safe and long-term method for storing hydrogen with high hydrogen storage density, has certain advantages in applications such as portable power supplies, emergency power supplies, and backup power supplies. Magnesium is one of the most abundant light alloys on Earth, and my country has very rich magnesium reserves, ranking second in the world. Magnesium hydride, produced by the hydrogenation of magnesium, has a very high hydrogen storage density (7.6 wt%) and has attracted widespread attention. Magnesium hydride releases hydrogen in two ways: thermal decomposition and hydrolysis. Thermal decomposition is an endothermic reaction with a high enthalpy change, requiring temperatures above 400℃ to release hydrogen. Hydrolysis, on the other hand, is an exothermic reaction that can occur at room temperature, releasing 15.2% of the mass of solid magnesium hydride, twice that of thermal decomposition. Therefore, the hydrolysis of magnesium hydride to produce hydrogen has attracted widespread research interest.

[0003] MgH2 ——> Mg+H2 ΔH=74.5kJ / mol

[0004] MgH2+2H2O ——> Mg(OH)2+2H2 ΔH=-277 kJ / mol

[0005] However, due to the difficulty in controlling the hydrolysis rate of magnesium hydride, most current magnesium hydride hydrolysis hydrogen production power generation devices are below 1kW in power, and the hydrolysis reaction temperature of magnesium hydride products is relatively high, between 300-500℃. Research shows that at temperatures above 350℃, the main product of the MgH2 hydrolysis reaction is magnesium oxide, while at temperatures below 300℃, the main product is magnesium hydroxide. At high temperatures, when the hydrolysis product is magnesium oxide, the required molar ratio of magnesium hydride to water is 1:1, requiring less water and making it suitable for applications with strict system weight requirements, such as drones and individual soldier power systems. When the product is magnesium hydroxide, the molar ratio of magnesium hydride to water is 1:2, requiring more water and making it more suitable for applications with less stringent system weight requirements, such as stationary power supplies. The higher reaction temperatures necessitate a series of thermal insulation measures to prevent risks such as burns to operators. When the reaction temperature reaches above 400℃, magnesium hydride self-decomposition reaction will occur, leading to a decrease in the overall hydrogen production of the system. Therefore, it is necessary to study and develop a magnesium hydride hydrolysis hydrogen production system at a milder temperature (below 200℃). Summary of the Invention

[0006] The purpose of this invention is to provide a mild and controllable thermoelectric combined device for producing hydrogen by magnesium hydride hydrolysis, which solves the technical problem of excessively high reaction temperature in the prior art for producing hydrogen by magnesium hydride hydrolysis.

[0007] The present invention discloses a mild and controllable magnesium hydride hydrolysis hydrogen production thermoelectric combined device, comprising a hydrogen production module, a fuel cell power generation module, a heat recovery module, and a control module. The hydrogen production module includes a reactor, a water tank, a water pump, and a cooling system. The outlet of the water tank is connected to the inlet of the water pump through a pipe. The outlet of the water pump is connected to the reactor through a first multi-channel valve group and several inlet pipes. Each inlet pipe enters the reactor and extends to the bottom of the reactor. Several through holes are arranged in the side wall of the inlet pipe along the axial and circumferential directions. Magnesium hydride solid fuel and a temperature sensor are arranged around each through hole. Several first pressure sensors, a gas collecting pipe, and a hydrogen outlet are arranged in the reactor. The gas collecting pipe is connected to the hydrogen outlet, and the hydrogen outlet is connected to the hydrogen inlet of the fuel cell power generation module through a pipe.

[0008] The cooling system includes a coolant container and a cooling pump. The outlet of the coolant container is connected to the inlet of the cooling pump via a pipe. The outlet of the cooling pump is connected to the reactor via a second multi-channel valve group and several cooling pipes. One end of each cooling pipe enters the magnesium hydride solid fuel in the reactor and surrounds the water inlet pipe and temperature sensor. Then the cooling pipe leaves the reactor and is connected to the inlet of the coolant container. The heat recovery module is installed on the cooling pipe between the reactor and the coolant container.

[0009] The control terminals of the water pump, the first multi-channel valve group, the temperature sensor, the first pressure sensor, the fuel cell power generation module, the cooling pump, and the second multi-channel valve group are respectively connected to the control module.

[0010] Furthermore, the reactor is equipped with a safety pressure relief valve and an electronic exhaust valve at the top.

[0011] Furthermore, the fuel cell power generation module includes a stack, and a second pressure sensor, a solenoid valve, a gas-liquid separator, a filter, and a pressure reducer are sequentially installed on the pipeline between the reactor and the stack. The solenoid valve is connected to an exhaust valve, and the stack is connected to an air supply device.

[0012] Furthermore, the air supply device is an open cathode structure fan or a closed cathode structure air compressor or air pump.

[0013] Furthermore, the temperature sensor is a thermocouple or a high-temperature platinum resistance thermometer.

[0014] Furthermore, the heat recovery module includes a cold water tank and a cold water supply device. The cooling pipe between the reactor and the coolant container forms a flat heat dissipation structure and is immersed in the cold water tank. The outlet of the cold water supply device is connected to the inlet of the cold water tank through a pipe and a control valve. The outlet of the cold water tank is connected to a hot water output terminal.

[0015] Furthermore, the heat recovery module adopts a flat-plate heat sink structure.

[0016] Furthermore, any cooling pipe flows through the entire reactor both horizontally and vertically, or flows through the reactor in sections, including an upper section, a middle section, and a lower section, or a left section, a middle section, and a right section.

[0017] Furthermore, the first multi-channel valve group and the second multi-channel valve group are each composed of multiple integrated solenoid valves, or are composed of individual solenoid valves, or are composed of a first multi-channel pump group and a second multi-channel pump group, or are composed of multiple pump groups and multiple valve groups.

[0018] Compared with existing technologies, the advantages of this invention are positive and significant. This invention precisely controls the pumping of water into a reactor containing magnesium hydride solid fuel, adjusting the amount of water fed in based on hydrogen production requirements, thereby controlling the hydrogen production output. Since the hydrolysis reaction is exothermic, this invention controls the temperature through a cooling system and recovers the heat generated during the hydrolysis reaction through a heat recovery device, further improving the system's energy utilization efficiency. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the modules of a mild and controllable magnesium hydride hydrolysis hydrogen production thermoelectric combined device according to the present invention.

[0020] Figure 2 This is a schematic diagram of the specific structure of a mild and controllable magnesium hydride hydrolysis hydrogen production thermoelectric combined device according to the present invention.

[0021] Figure 3 This is a schematic diagram of the reactor interior in a mild and controllable magnesium hydride hydrolysis hydrogen production thermoelectric combined unit according to the present invention. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments. However, the present invention is not limited to these embodiments. Any similar structures and similar variations of the present invention should be included within the scope of protection of the present invention. The use of directions such as up, down, front, back, left, and right in the present invention is only for the convenience of description and is not intended to limit the technical solution of the present invention.

[0023] like Figures 1-3As shown, the present invention provides a mild and controllable magnesium hydride hydrolysis hydrogen production thermoelectric combined device, including a hydrogen production module, a fuel cell power generation module, a heat recovery module, and a control module. The hydrogen production module includes a reactor 1, a water tank 2, a water pump 3, and a cooling system. The outlet of the water tank 2 is connected to the inlet of the water pump 3 through a pipe. The outlet of the water pump 3 is connected to the reactor 1 through a first multi-channel valve group 4 and several water inlet pipes 5. Each water inlet pipe 5 enters the reactor 1 and extends to the bottom of the reactor 1. Several through holes are arranged in the side wall of the water inlet pipe 5 along the axial and circumferential directions. Magnesium hydride solid fuel and a temperature sensor 6 are arranged around each through hole. The reactor 1 is provided with several first pressure sensors, a gas collecting pipe 7, and a hydrogen outlet. The gas collecting pipe 7 is connected to the hydrogen outlet, and the hydrogen outlet is connected to the hydrogen inlet of the fuel cell power generation module through a pipe.

[0024] The cooling system includes a coolant container 8 and a cooling pump 9. The outlet of the coolant container 8 is connected to the inlet of the cooling pump 9 through a pipe. The outlet of the cooling pump 9 is connected to the reactor 1 through a second multi-channel valve group 10 and several cooling pipes 11. One end of each cooling pipe 11 enters the magnesium hydride solid fuel in the reactor 1 and surrounds the water inlet pipe 5 and the temperature sensor 6. Then the cooling pipe 11 leaves the reactor 1 and is connected to the inlet of the coolant container 8. The heat recovery module is set on the cooling pipe 11 between the reactor 1 and the return port of the coolant container 8.

[0025] The control terminals of the water pump 3, the first multi-channel valve group 4, the temperature sensor 6, the first pressure sensor, the fuel cell power generation module, the cooling pump 9, and the second multi-channel valve group 10 are respectively connected to the control module.

[0026] Furthermore, a safety pressure relief valve 25 and an electronic exhaust valve are provided on the top of the reactor 1.

[0027] Furthermore, the fuel cell power generation module includes a stack 12. A second pressure sensor 13, a solenoid valve 14, a gas-liquid separator 15, a filter 16, and a pressure reducer 17 are sequentially installed on the pipeline between the reactor 1 and the stack 12. The solenoid valve 14 is connected to an exhaust valve 18, and the stack 12 is connected to an air supply device 19.

[0028] Furthermore, the air supply device 19 is an open cathode structure fan or a closed cathode structure air compressor or air pump.

[0029] Furthermore, the temperature sensor 6 is a thermocouple or a high-temperature platinum resistance thermometer.

[0030] Furthermore, the heat recovery module includes a cold water tank 20 and a cold water supply device 21. The cooling pipe 11 between the reactor 1 and the coolant container 8 forms a flat heat dissipation structure 22 and is immersed in the cold water tank 20. The outlet of the cold water supply device 21 is connected to the inlet of the cold water tank 20 through a pipe and a control regulating valve 23. The outlet of the cold water tank 20 is connected to a hot water output terminal 24.

[0031] Furthermore, the heat recovery module adopts a flat-plate heat sink structure.

[0032] Furthermore, any cooling pipe 11 flows through the entire reactor in both the transverse and longitudinal directions, or flows through the reactor in sections, including an upper section, a middle section, and a lower section, or a left section, a middle section, and a right section.

[0033] Furthermore, the first multi-channel valve group 4 and the second multi-channel valve group 10 are each composed of multiple integrated solenoid valves, or are composed of individual solenoid valves, or are composed of a first multi-channel pump group and a second multi-channel pump group structure, or are composed of multiple pump groups and multiple valve groups.

[0034] Specifically, in this embodiment, the reactor 1, water pump 3, first multi-channel valve group 4, temperature sensor 6, pressure sensor, cooling pump 9, second multi-channel valve group 10, heat recovery module, safety relief valve 25, electronic exhaust valve, fuel cell stack 12, solenoid valve 14, gas-liquid separator 15, filter 16, pressure reducer 17, exhaust valve 18, air supply device 19, open cathode structure fan, closed cathode structure air compressor, air pump, thermocouple, flat plate heat dissipation structure 22, cold water supply device 21, control regulating valve 23, and flat plate heat sink structure all adopt well-known solutions in the prior art, which are already understood by those skilled in the art and will not be described in detail here.

[0035] The working principle of this embodiment is as follows:

[0036] The hydrogen production module includes reactor 1, water tank 2, and auxiliary components (including water pump 3, filter 16, pressure reducer 17, and various valve groups). The magnesium hydride hydrolysis reactor 1 and water tank 2 are designed separately. The control module controls the flow rate of pumped water and coolant, as well as the opening and closing of the first multi-channel valve group 4 and the second multi-channel valve group 10, based on the temperature and pressure feedback from the first pressure sensor and temperature sensor 6, thereby controlling the water pumping volume and thus controlling the hydrogen production. Water from water tank 2 enters reactor 1 as needed via water pump 3 and the first multi-channel valve group 4. The magnesium hydride solid fuel in reactor 1 undergoes a hydrolysis reaction with the pumped water to produce hydrogen. The produced hydrogen passes through a gas-liquid separator 15 to remove water vapor, a filter 16 to remove impurities, and a pressure reducer 17 to reduce pressure before being supplied to the fuel cell stack 12. An electrochemical reaction occurs inside the fuel cell stack 12, converting the chemical energy of the fuel into electrical energy for use by the external load 26.

[0037] Reactor 1 is made of stainless steel or other high-temperature and high-pressure resistant materials. Reactor 1 preheats the incoming water into steam via electric heating. The steam enters reactor 1 through multiple through-holes in the inlet pipe 5, ensuring thorough and uniform contact between the water and magnesium hydride particles within reactor 1. The magnesium hydride particles are micron-sized particles, ranging from 3 to 100 microns, and can also be micron-sized particles further processed into blocks or other desired shapes.

[0038] A fuel cell power generation module is a proton exchange membrane fuel cell system with air or oxygen as the cathode and hydrogen as the anode. The hydrogen comes from a hydrogen production module, and the air or oxygen comes from auxiliary equipment such as high-pressure gas tanks, fans, gas pumps, or air compressors. Chemical energy is converted into electrical energy through electrochemical reactions.

[0039] The fuel cell stack 12 can draw in or blow in air using a fan or other means with an open cathode structure, or it can draw in air using an air compressor or air pump with a closed cathode structure, or it can supply air using an oxygen tank, air tank, or other means. All of these are within the scope of protection of this invention.

[0040] II. Since the magnesium hydride hydrolysis reaction is exothermic, the waste heat generated by the hydrolysis reaction needs to be discharged from reactor 1 promptly and quickly in order to maintain the temperature within the set range. The internal temperature of reactor 1 is regulated by the cooling system controlled by the control module, and the waste heat generated by the hydrolysis reaction is dissipated by the cooling system. When the temperature sensor 6 detects that the temperature at a certain point is higher than the target temperature, the control module controls the second multi-channel valve group 10 to open the corresponding cooling pipe 11 to cool the inside of reactor 1. The target temperature inside reactor 1 is within the range of 100-200℃. The coolant after passing through reactor 1 exchanges heat with the cold water in the cold water tank 20 and flows back to reactor 1. The control module controls the opening and closing of the cold water supply device 21 according to the temperature in the cold water tank 20, and the hot water output terminal 24 is used to supply hot water for external use.

[0041] Depending on the dimensions of reactor 1, the cooling pipe 11 can be selected to flow through the entire interior of reactor 1 along the height direction, or it can flow through reactor 1 in sections, such as the upper, middle, and lower sections, or the left, middle, and right sections. The coolant can be ethylene glycol, deionized water, glycerin, silicone oil, or a mixture of the above, or other heat-conducting liquids.

[0042] The cooling pipes are made of stainless steel or other high-temperature resistant metal materials. The cooling pipes outside the reactor 1 are arranged in a plate, cluster, or wave shape to facilitate heat dissipation.

[0043] Third, the heat recovery module recovers the heat transferred from the hydrogen production module to provide hot water or other heating systems for external use. The heat recovery module can also be a plate-type or other easily heat-dissipating structure, using natural cooling from the outside air or fan-blown heat sinks to provide indoor heating.

[0044] Fourth, the opening and closing frequency of each water inlet pipe is controlled by the first multi-channel valve group 4, and the opening and closing frequency of the coolant is controlled by the second multi-channel valve group 10. The first multi-channel valve group 4 and the second multi-channel valve group 10 can be integrated together by multiple solenoid valves 14, or each solenoid valve 14 can be placed separately and controlled individually; the first multi-channel valve group 4 and the second multi-channel valve group 10 can also be replaced by a first multi-channel multi-pump group and a second multi-channel pump group structure, or can be composed of multiple pump groups and multiple valve groups, all of which fall within the protection scope of this invention.

[0045] V. The control module can be a single main control board that controls all modules, or each module can have its own sub-control module, which is then controlled by the main control board based on the read parameters. The control module continuously reads and analyzes the parameters of other modules and controls the operation of each component within other modules according to the requirements of the external load 26 and the external heating system.

[0046] VI. The number and distribution of temperature sensors 6, water inlet pipes 5, and cooling pipes can be determined based on the actual output power requirements and the size of reactor 1. Multiple gas collecting pipes 7 and hydrogen outlets within reactor 1 ensure that the generated hydrogen can be safely and quickly transported out of reactor 1. The water inlet rate is determined based on the pressure feedback within reactor 1, thereby controlling the pressure within reactor 1 below 2 bar. Furthermore, if the target pressure is exceeded, the safety relief valve 25 opens to reduce the pressure, ensuring that the pressure within reactor 1 remains within the set operating pressure.

[0047] It is important to note that Figure 2 The diagram shown is for illustrative purposes only and does not represent the actual order. The order of the components can be adjusted according to actual needs.

[0048] The present invention will be illustrated below with two examples.

[0049] Example 1:

[0050] In one specific embodiment of the present invention, reactor 1 is filled with magnesium hydride particles of 3-50 micrometers in size. Water is introduced through 2-4 porous stainless steel pipes. A cooling pipe 11, resembling a spring, surrounds the water inlet pipe 5. Thermocouples are evenly distributed at the upper, middle, and lower positions of the water inlet pipe 5. The cooling pipe 11 is arranged in sections in the upper, middle, and lower regions of reactor 1. Hydrogen is collected through porous stainless steel pipes and then passes through a gas-liquid separator 15, a filter 16, and a pressure reducer 17 before entering the fuel cell stack 12. Air is supplied to the cathode of the fuel cell stack 12 by an air compressor. Hydrogen and oxygen from the air undergo an electrochemical reaction in the fuel cell stack 12 to produce electricity and water. The system's control module continuously monitors the thermocouple temperature inside reactor 1, the reading of the first pressure sensor inside reactor 1, the temperature of each component, and the voltage and current of the fuel cell stack 12, as well as controlling the opening and closing of the water pump 3, cooling pump 9, the first multi-channel valve group 4, and the second multi-channel valve group 10. Ethylene glycol is used as the coolant, and the target temperature inside reactor 1 is 150°C. The external cooling pipe of reactor 1 adopts a flat plate structure and is immersed in the cold water tank 20 to provide hot water to the outside as needed.

[0051] Example 2:

[0052] In another specific embodiment of the present invention, reactor 1 is filled with magnesium hydride particles of 3-50 micrometers in size. Water is introduced through 2-4 porous stainless steel pipes. Cooling pipes, resembling springs, surround the water inlet pipes 5. Thermocouples are evenly distributed at the top and bottom of the water inlet pipes 5. The cooling pipes are arranged in sections in the upper and lower regions of reactor 1. Hydrogen is collected through porous stainless steel pipes and then passes through a gas-liquid separator 15, a filter 16, and a pressure reducer 17 before entering the fuel cell stack 12. Air is supplied to the cathode of the fuel cell stack 12 by a fan. Hydrogen and oxygen from the air undergo an electrochemical reaction in the fuel cell stack 12 to produce electricity and water. The system's control module continuously monitors the thermocouple temperature inside reactor 1, the reading of the first pressure sensor inside reactor 1, the temperature of each component, and the voltage and current of the fuel cell stack 12, as well as controlling the opening and closing of the water pump 3, cooling pump 9, the first multi-channel valve group 4, and the second multi-channel valve group 10. Ethylene glycol is used as the coolant, and the target temperature inside reactor 1 is 150°C. The external cooling pipe of reactor 1 adopts a flat radiator structure for natural heat dissipation, which can be used in low temperatures in winter.

[0053] To achieve controllability in the magnesium hydride hydrolysis reaction, it is essential to ensure that the two reaction products are isolated and that the amounts of reactants participating in the hydrogen production reaction can be precisely controlled, with the supply of reactants able to be increased, decreased, or stopped as needed. For the two reactants, magnesium hydride and water, water, being a more fluid liquid, is easier to control precisely. Therefore, this invention precisely controls the amount of water pumped into reactor 1 containing solid magnesium hydride fuel, adjusting the water inflow according to the hydrogen production requirements, thereby controlling the hydrogen production. Since the hydrolysis reaction is exothermic, this invention controls the temperature through a cooling system and recovers the heat generated during the hydrolysis reaction through a heat recovery device, further improving the system's energy utilization efficiency.

Claims

1. A mild and controllable thermoelectric combined unit for producing hydrogen from magnesium hydride hydrolysis, characterized in that: The system includes a hydrogen production module, a fuel cell power generation module, a heat recovery module, and a control module. The hydrogen production module includes a reactor (1), a water tank (2), a water pump (3), and a cooling system. The outlet of the water tank (2) is connected to the inlet of the water pump (3) through a pipe. The outlet of the water pump (3) is connected to the reactor (1) through a first multi-channel valve group (4) and several inlet pipes (5). Each inlet pipe (5) enters the reactor (1) and extends to the bottom of the reactor (1). Several through holes are arranged along the axial and circumferential directions in the side wall of the inlet pipe (5). Magnesium hydride solid fuel and a temperature sensor (6) are arranged around each through hole. Several first pressure sensors, a gas collecting pipe (7), and a hydrogen outlet are arranged in the reactor (1). The gas collecting pipe (7) is connected to the hydrogen outlet. The hydrogen outlet is connected to the hydrogen inlet of the fuel cell power generation module through a pipe. The cooling system includes a coolant container (8) and a cooling pump (9). The outlet of the coolant container (8) is connected to the inlet of the cooling pump (9) via a pipe. The outlet of the cooling pump (9) is connected to the reactor (1) via a second multi-channel valve group (10) and several cooling pipes (11). One end of each cooling pipe (11) enters the magnesium hydride solid fuel in the reactor (1) and surrounds the water inlet pipe (5) and the temperature sensor (6). Then, the cooling pipe (11) leaves the reactor (1) and is connected to the inlet of the coolant container (8). The heat recovery module is installed on the cooling pipe (11) between the reactor (1) and the coolant container (8). The control terminals of the water pump (3), the first multi-channel valve group (4), the output terminal of the temperature sensor (6), the output terminal of the first pressure sensor, the control terminal of the fuel cell power generation module, the control terminal of the cooling pump (9), and the control terminal of the second multi-channel valve group (10) are respectively connected to the control module.

2. The mild and controllable magnesium hydride hydrolysis hydrogen production thermoelectric combined unit according to claim 1, characterized in that: The reactor (1) is equipped with a safety relief valve (25) and an electronic exhaust valve at the top.

3. The mild and controllable magnesium hydride hydrolysis hydrogen production thermoelectric combined unit according to claim 1, characterized in that: The fuel cell power generation module includes a stack (12). A second pressure sensor (13), a solenoid valve (14), a gas-liquid separator (15), a filter (16) and a pressure reducer (17) are sequentially installed on the pipeline between the reactor (1) and the stack (12). The solenoid valve (14) is connected to an exhaust valve (18), and the stack (12) is connected to an air supply device (19).

4. The mild and controllable magnesium hydride hydrolysis hydrogen production thermoelectric combined unit according to claim 3, characterized in that: The air supply device (19) is an open cathode structure fan or a closed cathode structure air compressor or air pump.

5. The mild and controllable magnesium hydride hydrolysis hydrogen production thermoelectric combined unit according to claim 1, characterized in that: The temperature sensor (6) is a thermocouple or a high-temperature platinum resistance thermometer.

6. The mild and controllable magnesium hydride hydrolysis hydrogen production thermoelectric combined unit according to claim 1, characterized in that: The heat recovery module includes a cold water tank (20) and a cold water supply device (21). The cooling pipe (11) between the reactor (1) and the coolant container (8) forms a flat heat dissipation structure (22) and is immersed in the cold water tank (20). The outlet of the cold water supply device (21) is connected to the inlet of the cold water tank (20) through a pipe and a control regulating valve (23). The outlet of the cold water tank (20) is connected to a hot water output terminal (24).

7. The mild and controllable magnesium hydride hydrolysis hydrogen production thermoelectric combined unit according to claim 1, characterized in that: The heat recovery module adopts a flat-plate heat sink structure.

8. The mild and controllable magnesium hydride hydrolysis hydrogen production thermoelectric combined unit according to claim 1, characterized in that: Any cooling pipe (11) flows through the entire reactor in both the transverse and longitudinal directions, or flows through the reactor in sections, including the upper section, the middle section and the lower section, or the left section, the middle section and the right section.

9. The mild and controllable magnesium hydride hydrolysis hydrogen production thermoelectric combined unit according to claim 1, characterized in that: The first multi-channel valve group (4) and the second multi-channel valve group (10) are each composed of multiple integrated solenoid valves, or are composed of individual solenoid valves, or are composed of the structure of the first multi-channel pump group and the second multi-channel pump group, or are composed of multiple pump groups and multiple valve groups.

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