A multi-reactor sodium borohydride hydrolysis hydrogen production system

Abstract

This invention provides a multi-reactor sodium borohydride hydrolysis hydrogen production system, comprising a raw material tank, multiple reactors connected in parallel, and a gas-liquid separator. The raw material tank has an outlet at its bottom, and each of the multiple reactors has an inlet at its bottom. The outlet of the raw material tank is connected to the inlets of the multiple reactors. A feed pump is installed between the outlet of the raw material tank and the inlets of the multiple reactors. Gas outlets are located at the top of both the multiple reactors and the gas-liquid separator, and these gas outlets are connected to the gas inlet of the gas-liquid separator. By connecting multiple reactors in parallel and feeding the reaction materials into each reactor separately using feed pumps, this invention improves the hydrogen production stability of high-flow-rate hydrolysis hydrogen production reactions. The feed rate of the feed pumps can be controlled as needed, allowing for rapid matching of new hydrogen production rates during fuel cell load changes.

Description

Technical Field

[0001] This utility model relates to the field of hydrogen production technology, specifically to a multi-reactor sodium borohydride hydrolysis hydrogen production system. Background Technology

[0002] While hydrogen energy and fuel cells have developed rapidly in recent years, their widespread adoption in civilian applications has been relatively slow. This is mainly because the challenges of hydrogen storage and transportation limit its use far from manufacturing sites. Currently, the more mature decentralized hydrogen supply methods are high-pressure gaseous hydrogen and cryogenic liquid hydrogen. However, high-pressure gaseous hydrogen carries the risk of high pressure and has poor overall safety; cryogenic liquid hydrogen has high storage costs and is prone to leakage. In contrast, on-site hydrogen production is more suitable for providing hydrogen sources for mobile fuel cell applications or for use as a hydrogen source in field operations.

[0003] Common on-site hydrogen production methods mainly involve natural gas and methanol reforming. These methods have some problems in practical applications: First, the time required to reach stable output after the reaction starts is relatively long; second, these reforming reactions require an external heat source or consume some fuel for heating, making the overall equipment relatively complex. In contrast, sodium borohydride hydrolysis hydrogen production is a simpler on-site hydrogen production technology with the following advantages: (1) High hydrogen storage density. Sodium borohydride itself contains up to 10.6 wt% hydrogen, and under the catalytic action of the catalyst, hydrolysis to hydrogen is relatively complete, reaching more than 90%. (2) Convenient adjustment of hydrogen production rate. The hydrogen production rate can be easily adjusted by controlling the concentration of sodium borohydride solution and the feed flow rate. (3) The reaction can be started at room temperature without the need for an additional heat source. (4) Low requirements for water quality. Sodium borohydride can be dissolved in tap water, lake water or seawater, and its solution can react efficiently with the catalyst to produce hydrogen, making it particularly suitable for use near water sources.

[0004] For hydrogen production by sodium borohydride hydrolysis, when the required hydrogen supply flow rate is large, such as supplying hydrogen to fuel cells with a power output range of tens of kilowatts and a large variation range of fuel cell output power, a single hydrolysis reactor is not capable of meeting the requirement of high-stability hydrogen supply. Utility Model Content

[0005] The present invention provides a multi-reactor sodium borohydride hydrolysis hydrogen production system, which can solve the problem of insufficient hydrogen supply stability when the hydrogen supply flow rate is large in existing sodium borohydride hydrolysis hydrogen production systems.

[0006] This utility model provides a multi-reactor sodium borohydride hydrolysis hydrogen production system, including a raw material tank, multiple reactors connected in parallel, and a gas-liquid separator. The bottom of the raw material tank is provided with a discharge port, and the bottom of each of the multiple reactors is provided with a feed port. The discharge port of the raw material tank is connected to the feed ports of the multiple reactors respectively. A feed pump is provided between the discharge port of the raw material tank and the feed ports of the multiple reactors. The top of the multiple reactors and the top of the gas-liquid separator are provided with gas outlets, and the gas outlets of the multiple reactors are connected to the gas inlet of the gas-liquid separator.

[0007] The beneficial effects of the embodiments of this utility model are as follows: In the embodiments of this utility model, by setting up multiple reactors in parallel and feeding the reaction raw materials into the multiple reactors respectively through the feed pump, the hydrogen production stability of the high-flow-rate hydrolysis hydrogen production reaction can be improved. The feeding speed of the feed pump can be controlled as needed, and the new hydrogen production speed can be quickly matched when the fuel cell load changes.

[0008] In one embodiment, each of the plurality of reactors is provided with a purge port at its top, the purge port is connected to a nitrogen source, and a first solenoid valve and a one-way valve are provided between the nitrogen source and the purge port.

[0009] The beneficial effects of the embodiments of this utility model are as follows: In the embodiments of this utility model, by blowing nitrogen gas into the reactor through the purge port, the air in the hydrogen production system can be discharged.

[0010] In one embodiment, a temperature transmitter, a first pressure transmitter, and a safety valve are provided on the top of each of the plurality of reactors, and the first pressure transmitter is communicatively connected to the feed pump.

[0011] The beneficial effects of the embodiments of this utility model are as follows: In the embodiments of this utility model, by installing a temperature transmitter and a first pressure transmitter on the reactor, the temperature and pressure inside the reactor can be monitored. By communicating with the feed pump, the feed pump is shut off when the first pressure transmitter detects that the reactor has reached the set high pressure, thereby preventing excessive pressure in the hydrogen production system.

[0012] In one embodiment, the gas outlet of the gas-liquid separator is connected to a hydrogen-using device, and a mass flow meter, a pressure gauge, and a back pressure valve are sequentially arranged between the gas outlet of the gas-liquid separator and the hydrogen-using device. The gas-liquid separator is equipped with a wire mesh demister.

[0013] The beneficial effects of the embodiments of this utility model are as follows: In the embodiments of this utility model, by setting a mass flow meter, a pressure gauge, and a back pressure valve, the pressure and flow rate of hydrogen supply can be monitored in real time. By setting a wire mesh demister, mist entrainment can be eliminated.

[0014] In one embodiment, the system further includes a mixing tank, which is provided with a solid material inlet, a water inlet, and a liquid outlet. The mixing tank is equipped with a stirring device. The water inlet is connected to a water pump. The liquid outlet of the mixing tank is connected to the feed inlet of the raw material tank. A transfer pump and a check valve are provided between the liquid outlet of the mixing tank and the feed inlet of the raw material tank.

[0015] The beneficial effects of the embodiments of this utility model are as follows: In the embodiments of this utility model, by setting up a mixing tank, the sodium borohydride solution can be automatically prepared on demand, and the mixing container and the raw material storage container are separate, that is, the mixing process will not affect the normal hydrolysis hydrogen production reaction, so that hydrogen can be supplied continuously for a long time and at a large flow rate. At the same time, the on-demand preparation does not require a large container to store the sodium borohydride solution, thereby reducing the size of the device.

[0016] In one embodiment, the mixing tank is equipped with a first liquid level indicator, which is communicatively connected to the water inlet pump, the transfer pump, and the feed pump; the raw material tank is equipped with a second liquid level indicator, which is communicatively connected to the transfer pump; the water inlet pump is communicatively connected to the motor of the stirring device; the top of the mixing tank is equipped with a vent, and the bottom of the mixing tank is equipped with a drain port; the top of the raw material tank is equipped with a vent, and the bottom of the raw material tank is equipped with a drain port.

[0017] The beneficial effects of the embodiments of this utility model are as follows: In the embodiments of this utility model, by communicating with the first liquid level indicator and the inlet pump, the inlet pump can be automatically turned on after a specific period of time when the first liquid level indicator reaches a low level, and turned off when the first liquid level indicator reaches a high level, thereby controlling the liquid level in the mixing tank and the mixing process. By communicating with the first liquid level indicator and the transfer pump, the transfer pump can be turned on when the first liquid level indicator reaches a high level, and turned off when the first liquid level indicator reaches a low level, thereby realizing automatic delivery of raw materials from the mixing tank to the raw material tank. By communicating with the first liquid level indicator and the feed pump, the feed pump can be automatically turned on when the first liquid level indicator reaches a high level for the second time, thereby starting the delivery of raw materials into the reactor and initiating the hydrogen production reaction. By communicating with the second liquid level indicator and the transfer pump, the transfer pump can be turned on when the second liquid level indicator reaches a low level, thereby controlling the liquid level in the raw material tank. By establishing a communication connection between the water inlet pump and the motor of the agitator, the agitator can be turned on when the water inlet pump is turned on and turned off when the water inlet pump is turned off.

[0018] In one embodiment, the system further includes a water washing tower, the top of which is provided with an air outlet, and the side of which is provided with a washing water inlet and an air inlet. The air inlet of the water washing tower is connected to the gas outlet of the plurality of reactors, the air outlet of the water washing tower is connected to the gas inlet of the gas-liquid separator, the washing water inlet is connected to an external water source, and a one-way valve is provided between the external water source and the washing water inlet.

[0019] The beneficial effects of the embodiments of this utility model are as follows: In the embodiments of this utility model, the water washing tower can remove a small amount of alkaline substances carried in the hydrogen gas at the reactor outlet.

[0020] In one embodiment, the system further includes a waste liquid tank, which has an inlet and a pressure balance port at its top and a drain port at its bottom. The bottom of the water washing tower and the bottom of the gas-liquid separator also have drain ports. The sides of the plurality of reactors have liquid overflow ports, and the bottoms of the plurality of reactors have vent ports. The drain ports of the water washing tower, the gas-liquid separator, the vent ports of the reactors, and the liquid overflow ports of the reactors are all connected to the inlet of the waste liquid tank. The pressure balance port is connected to the gas outlets of the plurality of reactors and the inlet of the water washing tower.

[0021] The beneficial effects of the embodiments of this utility model are as follows: In the embodiments of this utility model, the waste liquid tank can store the waste liquid generated in the hydrogen production process and automatically discharge the waste liquid from the system.

[0022] In one embodiment, a third level indicator is provided on the side of the water washing tower, and a third solenoid valve is provided between the drain port of the water washing tower and the inlet of the waste liquid tank. The third level indicator is communicatively connected to the third solenoid valve. A fourth level indicator is provided on the gas-liquid separator, and a fourth solenoid valve is provided between the drain port of the gas-liquid separator and the inlet of the waste liquid tank. The fourth level indicator is communicatively connected to the fourth solenoid valve. A fifth level indicator is provided on the side of the waste liquid tank, and a fifth solenoid valve is provided at the drain port of the waste liquid tank. The fifth level indicator is communicatively connected to the fifth solenoid valve. A second solenoid valve is provided between the vent port of the reactor and the inlet of the waste liquid tank. The feed pump is communicatively connected to the second solenoid valve.

[0023] The beneficial effects of the embodiments of this utility model are as follows: In the embodiments of this utility model, by communicating with the third liquid level indicator and the third solenoid valve, the third solenoid valve can be opened when the third liquid level indicator reaches a high level and closed when the third liquid level indicator reaches a low level, thereby controlling the liquid level in the water washing tower. By communicating with the fourth liquid level indicator and the fourth solenoid valve, the fourth solenoid valve can be opened when the fourth liquid level indicator reaches a high level and closed when the fourth liquid level indicator reaches a low level, thereby controlling the liquid level in the gas-liquid separator. By communicating with the fifth liquid level indicator and the fifth solenoid valve, the fifth solenoid valve can be opened when the fifth liquid level indicator reaches a high level and closed when the fifth liquid level indicator reaches a low level, thereby controlling the liquid level in the waste liquid tank. By communicating with the feed pump and the second solenoid valve, the second solenoid valve can be closed when the feed pump is on and opened when the feed pump is off, thereby allowing the remaining solution in the reactor to enter the waste liquid tank through the drain pipe, quickly stopping hydrogen production. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of the multi-reactor sodium borohydride hydrolysis hydrogen production system provided in an embodiment of this utility model.

[0026] Figure Descriptions: 1-Inlet pump; 2-Mixing tank; 3-Agitator; 4-First level indicator; 5-Transfer pump; 6-Raw material tank; 7-Second level indicator; 8-Feed pump; 9-Reactor; 10-Temperature transmitter; 11-First pressure transmitter; 12-Safety valve; 13-First solenoid valve; 14-Second solenoid valve; 15-Water washing tower; 16-Third level indicator; 17-Third solenoid valve; 18-Second pressure transmitter; 19-Gas-liquid separator; 20-Fourth level indicator; 21-Fourth solenoid valve; 22-Mass flow meter; 23-Pressure gauge; 24-Back pressure valve; 25-Waste liquid tank; 26-Fifth level indicator; 27-Fifth solenoid valve. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0028] Please see Figure 1 This application provides a multi-reactor sodium borohydride hydrolysis hydrogen production system, including a mixing tank 2, a raw material tank 6, multiple reactors 9 connected in parallel, a water washing tower 15, a gas-liquid separator 19, and a waste liquid tank 25.

[0029] The mixing tank 2 is equipped with a solid material inlet, a water inlet, and a liquid outlet. A vent is located at the top of the mixing tank 2, and a drain outlet is located at the bottom. An agitator 3 is installed inside the mixing tank 2. The water inlet is connected to a water pump 1. A first liquid level indicator 4 is installed on the mixing tank 2, and the first liquid level indicator 4 is communicatively connected to the water pump 1. The first liquid level indicator 4 has high and low liquid level responses and is interlocked with the water pump 1. When the liquid level is low, the water pump 1 automatically turns on after a specific time; when the liquid level is high, the water pump 1 turns off. Simultaneously, the water pump 1 is communicatively connected to the motor of the agitator 3, and the two motors are interlocked. When the water pump 1 is on, the agitator 3 is on; when the water pump 1 is off, the agitator 3 is off.

[0030] The raw material tank 6 has a vent at the top and a discharge port and a drain port at the bottom. The outlet of the mixing tank 2 is connected to the inlet of the raw material tank 6. A transfer pump 5 and a check valve are installed between the outlet of the mixing tank 2 and the inlet of the raw material tank 6. A second level indicator 7 is installed on the raw material tank 6 and is communicatively connected to the transfer pump 5. When the second level indicator 7 reaches a low level, the transfer pump 5 starts. A first level indicator 4 is communicatively connected to the transfer pump 5. When the first level indicator 4 reaches a high level, the transfer pump 5 starts; when the first level indicator 4 reaches a low level, the transfer pump 5 stops.

[0031] Each of the multiple reactors 9 has a feed inlet at its bottom, a gas outlet and a purge port at its top, a liquid overflow port on its side, and an vent at its bottom. The purge port is connected to a nitrogen source, and a first solenoid valve 13 and a check valve are installed between the nitrogen source and the purge port. The outlet of the raw material tank 6 is connected to the feed inlets of the multiple reactors 9, and a feed pump 8 is installed between the outlet of the raw material tank 6 and the feed inlets of the multiple reactors 9. The feed pump 8 has multiple speed settings, each corresponding to a different delivery rate, and can switch between different speed settings. Each of the multiple reactors 9 has a temperature transmitter 10, a first pressure transmitter 11, and a safety valve 12 installed at its top. The first pressure transmitter 11 is communicatively connected to the feed pump 8 and has a high-pressure response, interlocked with the feed pump 8 as a safety setting; when the pressure reaches the set value, the feed pump 8 shuts off. The first liquid level indicator 4 is connected to the feed pump 8. The feed pump 8 is interlocked with the high liquid level response of the first liquid level indicator 4. When the first liquid level indicator 4 reaches the high liquid level for the second time, the feed pump 8 will automatically start.

[0032] The gas outlets of multiple reactors 9 are all connected to the gas inlet of gas-liquid separator 19. A gas outlet is located at the top of gas-liquid separator 19, and this outlet is connected to a hydrogen-using device. A mass flow meter 22, a pressure gauge 23, and a back pressure valve 24 are sequentially installed between the gas outlet of gas-liquid separator 19 and the hydrogen-using device. A wire mesh demister is installed within gas-liquid separator 19. A drain port is located at the bottom of gas-liquid separator 19. A fourth liquid level indicator 20 is installed on gas-liquid separator 19.

[0033] The washing tower 15 has an air outlet at its top, a washing water inlet and an air inlet on its side, and a liquid drain at its bottom. The air inlet of the washing tower 15 is connected to the gas outlets of multiple reactors 9, and the air outlet of the washing tower 15 is connected to the gas inlet of the gas-liquid separator 19. The washing water inlet is connected to an external water source, and a one-way valve is installed between the external water source and the washing water inlet. A third liquid level indicator 16 is installed on the side of the washing tower 15.

[0034] The waste liquid tank 25 has an inlet and a pressure balance port at its top, and a drain port at its bottom. The drain ports of the water scrubbing tower 15, the gas-liquid separator 19, the vent of the reactor 9, and the liquid overflow port of the reactor 9 are all connected to the inlet of the waste liquid tank 25. The pressure balance port is connected to the gas outlets of multiple reactors 9 and the air inlet of the water scrubbing tower 15. A second pressure transmitter 18 is installed between the air outlet of the water scrubbing tower 15 and the gas inlet of the gas-liquid separator 19. A fifth level indicator 26 is installed on the side of the waste liquid tank 25.

[0035] A third solenoid valve 17 is installed between the drain port of the water washing tower 15 and the inlet port of the waste liquid tank 25. The third liquid level indicator 16 is communicatively connected to the third solenoid valve 17. The third liquid level indicator 16 is equipped with high and low liquid level response and is interlocked with the third solenoid valve 17. When the liquid level is high, the third solenoid valve 17 is opened, and when the liquid level is low, the third solenoid valve 17 is closed.

[0036] A fourth solenoid valve 21 is provided between the drain port of the gas-liquid separator 19 and the inlet port of the waste liquid tank 25. The fourth liquid level indicator 20 is communicatively connected to the fourth solenoid valve 21. The fourth liquid level indicator 20 is equipped with high and low liquid level response and is interlocked with the fourth solenoid valve 21. When the liquid level is high, the fourth solenoid valve 21 is opened, and when the liquid level is low, the fourth solenoid valve 21 is closed.

[0037] A second solenoid valve 14 is installed between the vent of reactor 9 and the inlet of waste liquid tank 25. Feed pump 8 is communicatively connected to the second solenoid valve 14. Feed pump 8 and the second solenoid valve are interlocked. When feed pump 8 is open, the second solenoid valve 14 is closed. When feed pump 8 is closed, the second solenoid valve 14 is opened.

[0038] The waste liquid tank 25 is equipped with a fifth solenoid valve 27 at its discharge port, and a fifth liquid level indicator 26 is communicatively connected to the fifth solenoid valve 27. The fifth liquid level indicator 26 is equipped with high and low liquid level responses and is interlocked with the fifth solenoid valve 27. When the liquid level is high, the fifth solenoid valve 27 is open, and when the liquid level is low, the fifth solenoid valve 27 is closed.

[0039] The control method of this hydrogen production system achieves automatic hydrogen production through the following steps: Step 1: In the first stage, the external sodium borohydride solid material conveying device begins to convey a specific weight of solid material into the mixing tank 2 and completes the feeding within a specific time period; (In Step 1, the sodium borohydride solid material can be stored in a silo and enter the mixing tank by screw conveyor. The time for a single material conveying is about 3 minutes, and the feeding time can be set to 5-8 minutes) Step Two: After feeding is completed, the water inlet pump 1 automatically starts, and the stirring device 3 is interlocked and activated. The water inlet pump 1 adds water to the mixing tank 2. The solid material and water come into contact and begin to dissolve under the action of stirring to form a solution. When the first liquid level indicator 4 reaches the high liquid level, the water inlet pump 1 is turned off, and the stirring device 3 is interlocked and turned off. (In Step Two, the external water source can be tap water, lake water, river water, seawater, etc. Since the amount of sodium borohydride solid material and water added to the mixing tank each time is fixed, the concentration of the sodium borohydride solution is also fixed.) Step 3: The transfer pump 5 is interlocked and transferred to the raw material tank 6 from the mixing tank 2. When the first liquid level indicator 4 reaches the low liquid level, the transfer pump 5 is turned off. Step 4: At this point, the second stage begins, and the external sodium borohydride solid material conveying device starts conveying a specific weight of solid material to the mixing tank 2 again; Step 5: After the feeding is completed, the water pump 1 will start automatically and the stirring device 3 will be interlocked and started. The water pump 1 will add water to the mixing tank 2. The solid material and water will come into contact and begin to dissolve under the action of stirring to form a solution. When the first liquid level indicator 4 reaches the high liquid level, the water pump 1 will be turned off and the stirring device 3 will be interlocked and turned off. Step Six: At this point, the feed pump 8 is interlocked and remains open thereafter; (In Step Six, after the feed pump 8 is turned on, it begins to transport sodium borohydride solution from the raw material tank 6 to multiple reactors 9. The solution enters from the bottom inlet of reactor 9 and, after contacting the catalyst, undergoes a hydrolysis reaction to produce hydrogen. After a certain residence time, when the liquid level of the sodium borohydride solution in the reactor reaches the height of the side liquid overflow port, the fully reacted solution flows out from the liquid overflow pipe and is collected into one stream before entering the waste liquid tank 25. Hydrogen gas flows out from the gas outlet pipe at the top of reactor 9 and is collected into one stream before entering the water washing tower 15. In the water washing tower 15, a small amount of alkaline substances entrained in the hydrogen gas are washed away after contact with the spray water. The hydrogen gas exits from the water washing tower 15...) The gas enters the gas-liquid separator 19 through the top outlet, while the washing water is automatically discharged into the waste liquid tank 25 under the interlocking action of the third liquid level indicator 16 and the third solenoid valve 17. The hydrogen entering the gas-liquid separator 19, after gas-liquid separation, has its liquid phase remaining at the bottom of the separator. The hydrogen then passes through a wire mesh demister to eliminate mist entrainment before entering the rear end through the gas outlet at the top of the separator 19. After the flow rate is detected by the mass flow meter 22 and the pressure is stabilized by the back pressure valve 24, it is supplied externally. The liquid phase in the gas-liquid separator 19 is automatically discharged into the waste liquid tank 25 under the interlocking action of the fourth liquid level indicator 21 and the fourth solenoid valve 20. The waste liquid in the waste liquid tank 25 is automatically discharged from the system under the interlocking action of the fifth liquid level indicator 26 and the fifth solenoid valve 27. Step 7: When the second liquid level indicator 7 reaches the low liquid level, the transfer pump 5 is interlocked and starts to transfer the sodium borohydride solution in the mixing tank 2 to the raw material tank 6. When the first liquid level indicator 4 reaches the low liquid level, the transfer pump 5 is shut down. (In step 7, the transfer pump 5 transfers the sodium borohydride solution at a rate greater than the feed pump 8 delivers the sodium borohydride solution to the reactor 9.) Step 8: Repeat steps 4, 5, and 7 continuously; (In step 8, the continuous supply of sodium borohydride solution is ensured through the cyclical conveying of sodium borohydride solid material, solution preparation, and solution transfer process, and this process does not affect the continuous hydrolysis hydrogen production reaction, thus enabling long-term continuous hydrogen supply.) Step Nine: End hydrogen production. At this point, feed pump 8 is shut off, and the second solenoid valve 14 is interlocked and opened, stopping hydrogen production. (In Step Nine, after the hydrogen production reaction ends and feed pump 8 is shut off, the second solenoid valve 14 opens, allowing the remaining solution in reactor 9 to flow into waste liquid tank 25 through the drain pipe, quickly stopping hydrogen production.) The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A multi-reactor sodium borohydride hydrolysis hydrogen production system, characterized in that, The system includes a raw material tank (6), multiple reactors (9) connected in parallel, and a gas-liquid separator (19). The bottom of the raw material tank (6) is provided with a discharge port, and the bottom of each of the multiple reactors (9) is provided with a feed port. The discharge port of the raw material tank (6) is connected to the feed port of each of the multiple reactors (9). A feed pump (8) is provided between the discharge port of the raw material tank (6) and the feed port of each of the multiple reactors (9). The top of each of the multiple reactors (9) and the top of the gas-liquid separator (19) are provided with a gas outlet. The gas outlets of each of the multiple reactors (9) are connected to the gas inlet of the gas-liquid separator (19).

2. The multi-reactor sodium borohydride water hydrolysis hydrogen production system of claim 1, wherein, Each of the multiple reactors (9) is provided with a purge port at the top, the purge port is connected to a nitrogen source, and a first solenoid valve (13) and a one-way valve are provided between the nitrogen source and the purge port.

3. The multi-reactor sodium borohydride water hydrolysis hydrogen generation system of claim 1, wherein, Each of the multiple reactors (9) is equipped with a temperature transmitter (10), a first pressure transmitter (11) and a safety valve (12) at its top. The first pressure transmitter (11) is communicatively connected to the feed pump (8).

4. The multi-reactor sodium borohydride water hydrolysis hydrogen production system of claim 1, wherein, The gas outlet of the gas-liquid separator (19) is connected to the hydrogen-using equipment. A mass flow meter (22), a pressure gauge (23), and a back pressure valve (24) are sequentially installed between the gas outlet of the gas-liquid separator (19) and the hydrogen-using equipment. A wire mesh demister is installed in the gas-liquid separator (19).

5. The multi-reactor sodium borohydride water hydrolysis hydrogen generation system of claim 1, wherein, It also includes a mixing tank (2), which is provided with a solid material inlet, a water inlet and a liquid outlet. A stirring device (3) is provided inside the mixing tank (2). The water inlet is connected to a water pump (1). The liquid outlet of the mixing tank (2) is connected to the feed inlet of the raw material tank (6). A transfer pump (5) and a one-way valve are provided between the liquid outlet of the mixing tank (2) and the feed inlet of the raw material tank (6).

6. The multi-reactor sodium borohydride hydrolysis hydrogen production system according to claim 5, characterized in that, The mixing tank (2) is equipped with a first liquid level indicator (4), which is communicatively connected to the water inlet pump (1), the transfer pump (5) and the feed pump (8); the raw material tank (6) is equipped with a second liquid level indicator (7), which is communicatively connected to the transfer pump (5); the water inlet pump (1) is communicatively connected to the motor of the stirring device (3); the top of the mixing tank (2) is equipped with a vent, and the bottom of the mixing tank (2) is equipped with a drain port; The top of the raw material tank (6) is provided with a vent, and the bottom of the raw material tank (6) is provided with a drain port.

7. The multi-reactor sodium borohydride water hydrolysis hydrogen generation system of claim 1, wherein, It also includes a water washing tower (15), the top of which is provided with an air outlet, and the side of which is provided with a washing water inlet and an air inlet. The air inlet of the water washing tower (15) is connected to the gas outlet of the plurality of reactors (9), the air outlet of the water washing tower (15) is connected to the gas inlet of the gas-liquid separator (19), the washing water inlet is connected to an external water source, and a one-way valve is provided between the external water source and the washing water inlet.

8. The multi-reactor sodium borohydride water hydrolysis hydrogen generation system of claim 7, wherein, It also includes a waste liquid tank (25), the top of which is provided with a liquid inlet and a gas pressure balance port, the bottom of which is provided with a liquid outlet, the bottom of the water washing tower (15) and the bottom of the gas-liquid separator (19) are both provided with liquid outlets, the sides of the plurality of reactors (9) are provided with liquid overflow ports, the bottom of the plurality of reactors (9) is provided with vent ports, the liquid outlet of the water washing tower (15), the liquid outlet of the gas-liquid separator (19), the vent port of the reactor (9) and the liquid overflow port of the reactor (9) are all connected to the liquid inlet of the waste liquid tank (25), and the gas pressure balance port is connected to the gas outlet of the plurality of reactors (9) and the gas inlet of the water washing tower (15).

9. The multi-reactor sodium borohydride water hydrolysis hydrogen generation system of claim 8, wherein, A third level indicator (16) is provided on the side of the water washing tower (15), and a third solenoid valve (17) is provided between the drain port of the water washing tower (15) and the inlet of the waste liquid tank (25). The third level indicator (16) is communicatively connected to the third solenoid valve (17). A fourth level indicator (20) is provided on the gas-liquid separator (19), and a fourth solenoid valve (21) is provided between the drain port of the gas-liquid separator (19) and the inlet of the waste liquid tank (25). The fourth level indicator (20) is communicatively connected to the fourth solenoid valve (21). A second solenoid valve (14) is provided between the vent of the reactor (9) and the inlet of the waste liquid tank (25). The feed pump (8) is communicatively connected to the second solenoid valve (14). A second pressure transmitter (18) is provided between the gas outlet of the water washing tower (15) and the gas inlet of the gas-liquid separator (19). The waste liquid tank (25) is provided with a fifth liquid level indicator (26) on its side, and a fifth solenoid valve (27) is provided at the drain port of the waste liquid tank (25). The fifth liquid level indicator (26) is communicatively connected to the fifth solenoid valve (27).

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