A general electrolyzed water hydrogen production test system and test method that can be used with multiple stacks

Abstract

The present invention provides a general electrolyzed water hydrogen production test system that can be used in multiple stacks in parallel. The system includes hydrogen side outlet stop valves provided at the hydrogen side outlets of each electrolytic cell stack. All the hydrogen side outlet stop valves are connected in parallel and aggregated. A hydrogen side temperature sensor is installed on the aggregated pipeline and is connected to a hydrogen separator. A hydrogen side pressure regulating valve, a hydrogen side pressure sensor, and a hydrogen side water replenishing switch valve are installed on the upper side of the hydrogen separator. A hydrogen side liquid level gauge is installed on the parallel side, and a hydrogen side drain valve and a hydrogen side return water valve are installed on the lower side. A hydrogen side cooler, a hydrogen side raw material circulation pump, a hydrogen side inlet stop valve, and the hydrogen side inlet of the electrolytic cell stack are sequentially connected to the rear end of the hydrogen side return water valve. The connection situation of the oxygen side outlet stop valve is similar to that of the hydrogen side outlet stop valve. Both sides of the electrolytic cell stack are respectively connected to the positive and negative poles of a DC power supply. The present invention also provides a corresponding test method. The present invention can be applied to multiple types of electrolytic cell stacks and can be used for performance testing of multiple electrolytic cell stacks connected in parallel.

Description

Technical Field

[0001] The present invention relates to the field of hydrogen production by electrolyzing water, and in particular to a general-purpose hydrogen production test system and test method for electrolyzing water that can be used with multiple stacks in parallel. Background Art

[0002] As a technology that is currently most promising for large-scale hydrogen production by combining clean energy, the performance and stability of the electrolytic cell stack for hydrogen production by electrolyzing water have received extensive attention.

[0003] Currently, the commercially available hydrogen production technologies can be divided into alkaline electrolytic hydrogen production (AEC), pure water electrolytic hydrogen production (PEMEC), and weak alkaline electrolytic hydrogen production (AEMEC). However, for the above hydrogen production technologies, there is currently no general-purpose test system that can meet the requirements for detecting their performance and stability. Summary of the Invention

[0004] The purpose of the present invention is to provide a general-purpose hydrogen production test system and test method for electrolyzing water that can be used with multiple stacks in parallel to meet the test requirements of the normal-temperature hydrogen production technologies of different types of electrolytic cell stacks.

[0005] To achieve the above purpose, the present invention provides a general-purpose hydrogen production test system for electrolyzing water that can be used with multiple stacks in parallel. The system is used for multiple electrolytic cell stacks of the same specification and includes a hydrogen-side outlet shut-off valve provided at the hydrogen-side outlet of each electrolytic cell stack and an oxygen-side outlet shut-off valve provided at the oxygen-side outlet of each electrolytic cell stack; all the hydrogen-side outlet shut-off valves are connected in parallel and aggregated, and a hydrogen-side temperature sensor is installed on the pipeline after the aggregation of the hydrogen-side outlet shut-off valves and is connected to a hydrogen separator. A hydrogen-side pressure regulating valve, a hydrogen-side pressure sensor, and a hydrogen-side water replenishing switch valve are installed on the upper side of the hydrogen separator. A hydrogen-side liquid level gauge is installed on the parallel side of the hydrogen separator. A hydrogen-side drain valve and a hydrogen-side return water valve are installed on the lower side of the hydrogen separator; the rear end of the hydrogen-side return water valve is sequentially connected with a hydrogen-side cooler, a hydrogen-side raw material circulation pump, a hydrogen-side inlet shut-off valve, and the hydrogen-side inlet of the electrolytic cell stack; all the oxygen-side outlet shut-off valves are connected in parallel and aggregated, and an oxygen-side temperature sensor is installed on the pipeline after the aggregation of the oxygen-side outlet shut-off valves and is connected to an oxygen separator. An oxygen-side pressure regulating valve, an oxygen-side pressure sensor, and an oxygen-side water replenishing switch valve are installed on the upper side of the oxygen separator. An oxygen-side liquid level gauge is installed on the parallel side of the oxygen separator. A hydrogen-side drain valve and an oxygen-side return water valve are installed on the lower side of the oxygen separator; the rear end of the oxygen-side return water valve is sequentially connected with an oxygen-side cooler, an oxygen-side raw material circulation pump, an oxygen-side inlet shut-off valve, and the oxygen-side inlet of the electrolytic cell stack.

[0006] The number of the hydrogen-side inlet stop valves, oxygen-side inlet stop valves, and electrolyzer stacks is multiple; the multiple hydrogen-side inlet stop valves are connected in parallel with each other through a hydrogen-side raw material circulation pump, and each hydrogen-side inlet stop valve is respectively connected to the hydrogen-side inlet of one of the electrolyzer stacks; the multiple oxygen-side inlet stop valves are connected in parallel with each other through an oxygen-side raw material circulation pump, and each oxygen-side inlet stop valve is respectively connected to the oxygen-side inlet of one of the electrolyzer stacks.

[0007] The inlet ends of the hydrogen-side water replenishment on-off valve and the oxygen-side water replenishment on-off valve are both connected to the same water replenishment pump, and the water replenishment pump is arranged to supply raw water, and the raw water is deionized water or lye.

[0008] The hydrogen-side pressure sensor and the hydrogen-side pressure regulating valve are communicatively connected, and the oxygen-side pressure sensor and the oxygen-side pressure regulating valve are communicatively connected, so that the hydrogen-side pressure sensor transmits the detected pressure signal to the hydrogen-side pressure regulating valve, and the oxygen-side pressure sensor transmits the detected pressure signal to the oxygen-side pressure regulating valve.

[0009] The hydrogen-side liquid level gauge is communicatively connected to the hydrogen-side water replenishment on-off valve and the hydrogen-side drain valve respectively, so that the hydrogen-side liquid level gauge transmits the detected liquid level signal to the hydrogen-side water replenishment on-off valve and the hydrogen-side drain valve; the oxygen-side liquid level gauge is communicatively connected to the oxygen-side water replenishment on-off valve and the oxygen-side drain valve respectively, so that the oxygen-side liquid level gauge transmits the detected liquid level signal to the oxygen-side water replenishment on-off valve and the oxygen-side drain valve.

[0010] The control requirements for the liquid level height represented by the liquid level signal detected by the hydrogen-side liquid level gauge are: it cannot be lower than the low-side detection site of the hydrogen-side liquid level gauge, and it cannot be higher than the water replenishment port on the hydrogen separator; and the control requirements for the liquid level height represented by the liquid level signal detected by the oxygen-side liquid level gauge are: it cannot be lower than the low-side detection site of the oxygen-side liquid level gauge, and it cannot be higher than the water replenishment port on the oxygen separator.

[0011] The hydrogen-side temperature sensor is communicatively connected to the hydrogen-side cooler, so that the hydrogen-side temperature sensor transmits the detected temperature signal to the hydrogen-side cooler.

[0012] The oxygen-side temperature sensor is communicatively connected to the oxygen-side cooler, so that the oxygen-side temperature sensor transmits the detected temperature signal to the oxygen-side cooler.

[0013] The electrolyzer stack is connected to a DC power supply, so that the DC power supply provides the direct current required for electrolysis; the DC power supply has multiple electrolysis gears and can supply power to multiple electrolyzer stacks simultaneously; the DC power supply can record the voltage and current provided to each electrolyzer stack, and can record the total voltage and total current required for electrolysis.

[0014] On the other hand, the present invention provides a general electrolyzed water hydrogen production test method that can be used with multiple stacks, which is based on the general electrolyzed water hydrogen production test system that can be used with multiple stacks described above, and can be switched between four working modes, and the working modes include a test mode of a strong base hydrogen production electrolyzer stack, a test mode of a pure water hydrogen production electrolyzer stack, an electrolyte bilateral circulation test mode of a weak base hydrogen production electrolyzer stack, and an electrolyte hydrogen side circulation test mode of a weak base hydrogen production electrolyzer stack.

[0015] In the test mode of the strong base hydrogen production electrolyzer stack, the general electrolyzed water hydrogen production test method that can be used with multiple stacks includes:

[0016] S1: Connect the general electrolyzed water hydrogen production test system that can be used with multiple stacks to multiple electrolyzer stacks;

[0017] S2: Open the oxygen side inlet stop valve, hydrogen side inlet stop valve, oxygen side outlet stop valve, and hydrogen side outlet stop valve before and after the electrolyzer stack of the general electrolyzed water hydrogen production test system that can be used with multiple stacks; close the hydrogen side drain valve and oxygen side drain valve, and open the hydrogen side makeup water switch valve and oxygen side makeup water switch valve so that strong base solution is injected into the hydrogen separator and oxygen separator until the control requirements of the liquid level height indicated by the liquid level signal are met, and then close the hydrogen side makeup water switch valve and oxygen side makeup water switch valve;

[0018] S3: Open the oxygen side raw material circulation pump, hydrogen side raw material circulation pump, oxygen side return water valve, and hydrogen side return water valve;

[0019] S4: After the strong base solution fills the inside of the general electrolyzed water hydrogen production test system that can be used with multiple stacks, apply direct current to the measured electrolyzer stack;

[0020] S5: The hydrogen side pressure regulating valve and the oxygen side pressure regulating valve respectively adjust the valve opening according to the data measured by the hydrogen side pressure sensor and the oxygen side pressure sensor and the required outlet pressure; the hydrogen side makeup water switch valve and the oxygen side makeup water switch valve are respectively opened or closed according to the liquid level height indicated by the liquid level signal detected by the hydrogen side liquid level gauge and the oxygen side liquid level gauge and the control requirements of the liquid level height; the hydrogen side cooler and the oxygen side cooler respectively control their cooling power according to the data detected by the hydrogen side temperature sensor and the oxygen side temperature sensor and the required temperature;

[0021] In the test mode of the pure water hydrogen production electrolyzer stack, the general electrolyzed water hydrogen production test method that can be used with multiple stacks includes:

[0022] S1’: Connect the general electrolyzed water hydrogen production test system that can be used with multiple stacks to multiple electrolyzer stacks;

[0023] S2’: Open the oxygen-side inlet stop valve, oxygen-side outlet stop valve, and hydrogen-side outlet stop valve before and after the electrolytic cell stack of the multi-stack usable general-purpose electrolytic water hydrogen production test system, and close the hydrogen-side inlet stop valve; close the hydrogen-side drain valve and oxygen-side drain valve, and close the hydrogen-side make-up water switch valve and open the oxygen-side make-up water switch valve so that deionized water is injected into the oxygen separator until the liquid level height of the oxygen separator meets the control requirements of the liquid level height indicated by the liquid level signal. At this time, close the oxygen-side make-up water switch valve;

[0024] S3’: Open the oxygen-side raw material circulation pump and oxygen-side return water valve, while keeping the hydrogen-side raw material circulation pump and hydrogen-side return water valve closed;

[0025] S4’: When deionized water fills the entire oxygen-side circuit of the electrolytic cell stack, apply direct current to the measured electrolytic cell stack;

[0026] S5’: The hydrogen-side pressure regulating valve and oxygen-side pressure regulating valve respectively adjust the valve opening according to the data measured by the hydrogen-side pressure sensor and oxygen-side pressure sensor and the required outlet pressure; the hydrogen-side make-up water switch valve remains closed, and the oxygen-side make-up water switch valve is opened or closed according to the liquid level height indicated by the liquid level signal detected by the oxygen-side liquid level gauge and the control requirements of this liquid level height; the hydrogen-side cooler does not work, and the oxygen-side cooler controls its cooling power according to the data detected by the oxygen-side temperature sensor and the required temperature;

[0027] In the electrolyte double-side circulation test mode of the weak-alkali hydrogen production electrolytic cell stack, the multi-stack usable general-purpose electrolytic water hydrogen production test method is the same as the multi-stack usable general-purpose electrolytic water hydrogen production test method in the test mode of the strong-alkali hydrogen production electrolytic cell stack;

[0028] In the electrolyte hydrogen-side circulation test mode of the weak-alkali hydrogen production electrolytic cell stack, the multi-stack usable general-purpose electrolytic water hydrogen production test method includes:

[0029] S1”: Connect the multi-stack usable general-purpose electrolytic water hydrogen production test system to multiple electrolytic cell stacks;

[0030] S2”: Open the hydrogen-side inlet stop valve, oxygen-side outlet stop valve, and hydrogen-side outlet stop valve before and after the electrolytic cell stack of the multi-stack usable general-purpose electrolytic water hydrogen production test system, and close the oxygen-side inlet stop valve; close the hydrogen-side drain valve and oxygen-side drain valve, and open the hydrogen-side make-up water switch valve and close the oxygen-side make-up water switch valve so that weak-alkali lye is injected into the hydrogen separator until the liquid level height of the hydrogen separator meets the control requirements of the liquid level height indicated by the liquid level signal. At this time, close the hydrogen-side make-up water switch valve;

[0031] S3”: Keep the oxygen-side raw material circulation pump and oxygen-side return water valve closed, and open the hydrogen-side raw material circulation pump and hydrogen-side return water valve;

[0032] S4”: After the weak base alkaline solution fills the entire hydrogen-side circuit of the electrolyzer stack, direct current is applied to the measured electrolyzer stack.

[0033] S5”: The hydrogen-side pressure regulating valve and the oxygen-side pressure regulating valve respectively adjust the valve opening according to the data measured by the hydrogen-side pressure sensor and the oxygen-side pressure sensor and the required outlet pressure; the oxygen-side water replenishment switch valve remains closed, and the hydrogen-side water replenishment switch valve is opened or closed according to the liquid level height indicated by the liquid level signal detected by the hydrogen-side liquid level gauge and the control requirements for this liquid level height; the oxygen-side cooler does not work, and the hydrogen-side cooler controls its cooling power according to the data detected by the hydrogen-side temperature sensor and the required temperature.

[0034] The general-purpose electrolytic water hydrogen production test system that can be used with multiple stacks, through the respective parallel circuits on the hydrogen side and the oxygen side, can simultaneously meet the test requirements of the normal-temperature hydrogen production technology of different types of electrolyzer stacks, and can be used for the performance test of multiple electrolyzer stacks in parallel, conveniently and efficiently detecting the volt-ampere characteristic curves of alkaline electrolysis, pure water electrolysis, and weak base electrolysis hydrogen production electrolyzers, the influence of hydrogen production efficiency on working temperature and pressure, and the feasibility of using multiple electrolyzer stacks in combination. Description of the Drawings

[0035] Figure 1 It is a schematic structural diagram of the general-purpose electrolytic water hydrogen production test system that can be used with multiple stacks of the present invention.

[0036] Figure 2 It is a schematic diagram of the wiring method between the electrolyzer stack and the DC power supply of the present invention.

[0037] Figure 3 It is a working principle diagram of the test mode of the strong base hydrogen production electrolyzer stack and the electrolyte double-side circulation test mode of the weak base hydrogen production electrolyzer stack of the general-purpose electrolytic water hydrogen production test method that can be used with multiple stacks of the present invention.

[0038] Figure 4 It is a working principle diagram of the test mode of the pure water hydrogen production electrolyzer stack of the general-purpose electrolytic water hydrogen production test method that can be used with multiple stacks of the present invention.

[0039] Figure 5 It is a working principle diagram of the electrolyte hydrogen-side circulation test mode of the weak base hydrogen production electrolyzer stack of the general-purpose electrolytic water hydrogen production test method that can be used with multiple stacks of the present invention.

[0040] Reference Signs:

[0041] Multiple electrolyzer stacks stack1, stack2, stack3, stack4, hydrogen-side pressure regulating valve 1, hydrogen-side pressure sensor 2, hydrogen separator 3, hydrogen-side liquid level gauge 4, hydrogen-side make-up water on-off valve 5, make-up water pump 6, oxygen-side make-up water on-off valve 7, oxygen-side liquid level gauge 8, oxygen separator 9, oxygen-side pressure sensor 10, oxygen-side pressure regulating valve 11, oxygen-side return water valve 12, oxygen-side drain valve 13, oxygen-side cooler 14, oxygen-side raw material circulation pump 15, oxygen-side temperature sensor 16, hydrogen-side drain valve 17, hydrogen-side cooler 18, hydrogen-side raw material circulation pump 19, oxygen-side inlet stop valve 20, hydrogen-side inlet stop valve 21, oxygen-side outlet stop valve 22, hydrogen-side outlet stop valve 23, hydrogen-side temperature sensor 24, hydrogen-side return water valve 25, DC power supply 26. Detailed implementation mode

[0042] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0043] Embodiment 1 A general electrolytic water hydrogen production test system that can be used in multiple stacks

[0044] As Figure 1 shown is a general electrolytic water hydrogen production test system that can be used in multiple stacks, which is used for multiple electrolyzer stacks stack1, stack2, stack3, stack4 of the same specification, and includes: hydrogen-side pressure regulating valve 1, hydrogen-side pressure sensor 2, hydrogen separator 3, hydrogen-side liquid level gauge 4, hydrogen-side make-up water on-off valve 5, make-up water pump 6, oxygen-side make-up water on-off valve 7, oxygen-side liquid level gauge 8, oxygen separator 9, oxygen-side pressure sensor 10, oxygen-side pressure regulating valve 11, oxygen-side return water valve 12, oxygen-side drain valve 13, oxygen-side cooler 14, oxygen-side raw material circulation pump 15, oxygen-side temperature sensor 16, hydrogen-side drain valve 17, hydrogen-side cooler 18, hydrogen-side raw material circulation pump 19, oxygen-side inlet stop valve 20, hydrogen-side inlet stop valve 21, oxygen-side outlet stop valve 22, hydrogen-side outlet stop valve 23, hydrogen-side temperature sensor 24 and hydrogen-side return water valve 25.

[0045] Among them, the multiple electrolyzer stacks stack1, stack2, stack3, and stack4 are the test objects of the present invention. A hydrogen-side outlet stop valve 23 is provided at the hydrogen-side outlet of each electrolyzer stack. All the hydrogen-side outlet stop valves 23 are connected in parallel and aggregated. A hydrogen-side temperature sensor 24 is installed on the pipeline after the aggregation of the hydrogen-side outlet stop valves 23 and is connected to the hydrogen separator 3. A hydrogen-side pressure regulating valve 1, a hydrogen-side pressure sensor 2, and a hydrogen-side water replenishing switch valve 5 are installed on the upper side of the hydrogen separator 3. A hydrogen-side liquid level gauge 4 is installed on the parallel side (i.e., the side surface) of the hydrogen separator 3. A hydrogen-side drain valve 17 and a hydrogen-side return water valve 25 are installed on the lower side of the hydrogen separator 3. The rear end of the hydrogen-side return water valve 25 is successively connected to a hydrogen-side cooler 18, a hydrogen-side raw material circulation pump 19, a hydrogen-side inlet stop valve 21, and the hydrogen-side inlet of the electrolyzer stack. The number of the hydrogen-side inlet stop valves 21 and the electrolyzer stacks is multiple. The multiple hydrogen-side inlet stop valves 21 are connected in parallel with each other through the hydrogen-side raw material circulation pump 19. Each hydrogen-side inlet stop valve 21 is respectively connected to the hydrogen-side inlet of one of the electrolyzer stacks.

[0046] An oxygen-side outlet stop valve 22 is provided at the oxygen-side outlet of each electrolyzer stack stack1, stack2, stack3, and stack4. All the oxygen-side outlet stop valves 22 are connected in parallel and aggregated. An oxygen-side temperature sensor 16 is installed on the pipeline after the aggregation of the oxygen-side outlet stop valves 22 and is connected to the oxygen separator 9. An oxygen-side pressure regulating valve 11, an oxygen-side pressure sensor 10, and an oxygen-side water replenishing switch valve 7 are installed on the upper side of the oxygen separator 9. An oxygen-side liquid level gauge 8 is installed on the parallel side of the oxygen separator 9. A hydrogen-side drain valve 13 and an oxygen-side return water valve 12 are installed on the lower side of the oxygen separator 9. The rear end of the oxygen-side return water valve 12 is successively connected to an oxygen-side cooler 14, an oxygen-side raw material circulation pump 15, an oxygen-side inlet stop valve 20, and the oxygen-side inlet of the electrolyzer stack. The number of the oxygen-side inlet stop valves 20 and the electrolyzer stacks is multiple. The multiple oxygen-side inlet stop valves 20 are connected in parallel with each other through the oxygen-side raw material circulation pump 15. Each oxygen-side inlet stop valve 20 is respectively connected to the oxygen-side inlet of one of the electrolyzer stacks.

[0047] The inlet ends of the hydrogen-side water replenishing switch valve 5 and the oxygen-side water replenishing switch valve 7 are both connected to the same water replenishing pump 6, and the water replenishing pump 6 is arranged to supply raw water. Among them, the raw water can be deionized water or alkali solution, and the alkali solution is a weak alkali solution or a strong alkali solution.

[0048] The hydrogen-side pressure sensor 2 and the hydrogen-side pressure regulating valve 1 are communicatively connected, and the oxygen-side pressure sensor 10 and the oxygen-side pressure regulating valve 11 are communicatively connected. Therefore, the hydrogen-side pressure sensor 2 can transmit the detected pressure signal to the hydrogen-side pressure regulating valve 1 to control the opening degree of the hydrogen-side pressure regulating valve 1, and the oxygen-side pressure sensor 10 can transmit the detected pressure signal to the oxygen-side pressure regulating valve 11 to control the opening degree of the oxygen-side pressure regulating valve 11.

[0049] The hydrogen-side liquid level gauge 4 is respectively communicatively connected to the hydrogen-side water replenishment switch valve 5 and the hydrogen-side drain valve 17. Therefore, the hydrogen-side liquid level gauge 4 can transmit the liquid level signal it detects to the hydrogen-side water replenishment switch valve 5 and the hydrogen-side drain valve 17 to control the opening and closing of these two valves.

[0050] The oxygen-side liquid level gauge 8 is respectively communicatively connected to the oxygen-side water replenishment switch valve 7 and the oxygen-side drain valve 13. Therefore, the oxygen-side liquid level gauge 8 can transmit the liquid level signal it detects to the oxygen-side water replenishment switch valve 7 and the oxygen-side drain valve 13 to control the opening and closing of the valves.

[0051] In this embodiment, the control requirements for the liquid level height represented by the liquid level signal are as follows: it cannot be lower than the low-side detection site of the liquid level gauge and cannot be higher than the water replenishment port on the separator. For strong and weak alkaline electrolytes (i.e., raw water), it is necessary to ensure that after electrolytic water consumption, the change in the electrolyte concentration in the device is within 1% (compared with the national standard GBT37562-2019 required for current relevant industrial applications, which is 27-32%, the requirements of the test system of this application are higher).

[0052] That is to say, in this embodiment, when the hydrogen-side liquid level gauge 4 (or the oxygen-side liquid level gauge 8) detects that the liquid level height represented by the liquid level signal is higher than the water replenishment port on the hydrogen separator 3 (or the oxygen separator 9), the hydrogen-side drain valve 17 (or the oxygen-side drain valve 13) opens; when the liquid level height represented by the liquid level signal is lower than the water replenishment port on the hydrogen separator 3 (or the oxygen separator 9), the hydrogen-side drain valve 17 (or the oxygen-side drain valve 13) closes. Thus, the control requirements for the liquid level height represented by the liquid level signal are met.

[0053] Similarly, when the hydrogen-side liquid level gauge 4 (or the oxygen-side liquid level gauge 8) detects that the liquid level height represented by the liquid level signal is lower than the low-side detection site of the hydrogen-side liquid level gauge 4 (or the oxygen-side liquid level gauge 8), the hydrogen-side water replenishment switch valve 5 (or the oxygen-side water replenishment switch valve 7) opens; when the liquid level height represented by the liquid level signal is higher than the low-side detection site of the hydrogen-side liquid level gauge 4 (or the oxygen-side liquid level gauge 8), the hydrogen-side water replenishment switch valve 5 (or the oxygen-side water replenishment switch valve 7) closes. Thus, the control requirements for the liquid level height represented by the liquid level signal are met.

[0054] The hydrogen-side temperature sensor 24 is communicatively connected to the hydrogen-side cooler 18. Thus, the hydrogen-side temperature sensor 24 can transmit the temperature signal it detects to the hydrogen-side cooler 18 to control the cooling capacity and further control the temperature entering the hydrogen separator 3. In this embodiment, the required temperature entering the hydrogen separator 3 needs to be controlled at 60°C - 95°C, which is set according to requirements.

[0055] The oxygen-side temperature sensor 16 is communicatively connected to the oxygen-side cooler 14. Thus, the oxygen-side temperature sensor 16 can transmit the detected temperature signal to the oxygen-side cooler 14 to control the cooling capacity, and further control the temperature entering the oxygen separator 9. Among them, the required temperature entering the oxygen separator 9 is the same as the required temperature entering the hydrogen separator 3, and the required temperature entering the oxygen separator 9 needs to be controlled within 60°C - 95°C, which is set according to requirements.

[0056] As Figure 1 and Figure 2 shown, the electrolytic cell stack is connected to the DC power supply 26, so that the DC power required for electrolysis is provided by the DC power supply 26; the DC power supply 26 has multiple electrolysis gears and can supply power to multiple electrolytic cell stacks simultaneously; the DC power supply 26 can record the voltage and current provided to each electrolytic cell stack 26, and can record the total voltage and total current required for electrolysis.

[0057] The required test data of the general-purpose electrolytic water hydrogen production test system that can be used in multiple stacks of the present invention include: the volt-ampere characteristic curve of the electrolytic cell stack, the influence of hydrogen production efficiency on working temperature and pressure, and the feasibility of using multiple electrolytic cell stacks in combination. Among them, the volt-ampere characteristic curve of the electrolytic cell stack is obtained by recording the voltage and current data through the DC power supply 26 to obtain the corresponding curve. The influence of hydrogen production efficiency on working temperature and pressure is obtained by measuring the liquid level with the hydrogen-side liquid level gauge 4 and the oxygen-side liquid level gauge 8, measuring the temperature with the oxygen-side temperature sensor 16 and the hydrogen-side temperature sensor 24, and measuring the pressure with the hydrogen-side pressure sensor 2 and the oxygen-side pressure sensor 10.

[0058] Embodiment 2 General-purpose electrolytic water hydrogen production test method that can be used in multiple stacks

[0059] Based on the general-purpose electrolytic water hydrogen production system that can be used in multiple stacks described above, the general-purpose electrolytic water hydrogen production test method that can be used in multiple stacks can be switched between four working modes, and the working modes include the test mode of the strong-alkali hydrogen production electrolytic cell stack, the test mode of the pure-water hydrogen production electrolytic cell stack, the electrolyte double-side circulation test mode of the weak-alkali hydrogen production electrolytic cell stack, and the electrolyte hydrogen-side circulation test mode of the weak-alkali hydrogen production electrolytic cell stack.

[0060] As Figure 3 shown is the first working mode of the general-purpose electrolytic water hydrogen production test method that can be used in multiple stacks. This working mode is the test mode of the strong-alkali hydrogen production electrolytic cell stack, that is, in this working mode, the electrolytic cell stack is a strong-alkali hydrogen production electrolytic cell stack. The characteristics of the strong-alkali hydrogen production electrolytic cell stack are that the hydrogen side and the oxygen side cannot withstand differential pressure operation, and there must be electrolyte circulation on both the hydrogen side and the oxygen side during operation.

[0061] In this working mode, the general-purpose electrolytic water hydrogen production test method that can be used in multiple stacks specifically includes the following steps:

[0062] Step S1: Connect the general-purpose electrolytic water hydrogen production test system that can be used with multiple stacks to multiple electrolytic cell stacks.

[0063] Step S2: Open the oxygen-side inlet stop valve 20, hydrogen-side inlet stop valve 21, oxygen-side outlet stop valve 22, and hydrogen-side outlet stop valve 23 before and after the electrolytic cell stack of the general-purpose electrolytic water hydrogen production test system that can be used with multiple stacks; close the hydrogen-side drain valve 17 and oxygen-side drain valve 13, and open the hydrogen-side makeup water switch valve 5 and oxygen-side makeup water switch valve 7, so that the strong alkali lye is injected into the hydrogen separator 3 and oxygen separator 9 through the makeup water pump 6 until the control requirements of the liquid level height indicated by the liquid level signal are met (that is, it cannot be lower than the low-side detection site of the liquid level gauge and cannot be higher than the makeup water port on the separator), and at this time, close the hydrogen-side makeup water switch valve 5 and oxygen-side makeup water switch valve 7.

[0064] In this embodiment, the strong alkali lye is a potassium hydroxide solution with a mass fraction of 30% or a sodium hydroxide solution with a mass fraction of 25%.

[0065] Among them, if multiple alkaline electrolytic cell stacks are to be measured in parallel, open the oxygen-side inlet stop valve 20, hydrogen-side inlet stop valve 21, oxygen-side outlet stop valve 22, and hydrogen-side outlet stop valve 23 before and after each electrolytic cell stack; if a single electrolytic cell stack is to be measured, only open the oxygen-side inlet stop valve 20, hydrogen-side inlet stop valve 21, oxygen-side outlet stop valve 22, and hydrogen-side outlet stop valve 23 before and after the electrolytic cell stack to be measured.

[0066] Step S3: Open the oxygen-side raw material circulation pump 15, hydrogen-side raw material circulation pump 19, oxygen-side return water valve 12, and hydrogen-side return water valve 25 to fill the inside of the general-purpose electrolytic water hydrogen production test system that can be used with multiple stacks with the strong alkali lye and maintain the liquid levels in the hydrogen separator 3 and oxygen separator 9.

[0067] The above steps S1 - S3 are used to ensure that there is electrolyte on both the hydrogen side and oxygen side of the alkaline electrolytic cell stack.

[0068] Step S4: After the strong alkali lye fills the inside of the general-purpose electrolytic water hydrogen production test system that can be used with multiple stacks, apply direct current to the measured electrolytic cell stack, and the electrolytic cell stack starts to generate hydrogen and oxygen. Thus, hydrogen and the unreacted electrolyte enter the hydrogen separator 3, and oxygen and the unreacted electrolyte enter the oxygen separator 9.

[0069] Step S5: The hydrogen-side pressure regulating valve 1 and the oxygen-side pressure regulating valve 11 respectively adjust the valve opening according to the data measured by the hydrogen-side pressure sensor 2 and the oxygen-side pressure sensor 10 and the required outlet pressure, so as to stabilize the outlet pressure; the hydrogen-side water replenishing switch valve 5 and the oxygen-side water replenishing switch valve 7 respectively open or close according to the liquid level height indicated by the liquid level signals detected by the hydrogen-side liquid level gauge 4 and the oxygen-side liquid level gauge 8 and the control requirements for the liquid level height, so as to maintain a stable liquid level in the hydrogen separator 3 and the oxygen separator 9; the hydrogen-side cooler 18 and the oxygen-side cooler 14 respectively control their cooling power according to the data detected by the hydrogen-side temperature sensor 24 and the oxygen-side temperature sensor 16 and the required temperature.

[0070] Thus, through the above-mentioned step S5, it is ensured that the hydrogen side and the oxygen side are equalized in pressure during operation.

[0071] In the step S5, the required outlet pressure is set according to the demand, generally should be within 0 - 3.5 MPa. The control requirements for the liquid level height indicated by the liquid level signal are: it cannot be lower than the low-side detection site of the liquid level gauge, and cannot be higher than the water replenishing port on the separator. The required temperature is controlled at 60°C - 95°C and is set according to the demand.

[0072] In the step S5, since the electrolytic cell stack reaction consumes water, therefore, in the step S5, the water replenishing pump 6 is set to provide deionized water. When the liquid levels measured by the hydrogen-side liquid level gauge 4 and the oxygen-side liquid level gauge 8 are relatively low (for example, lower than the low-side detection site of the liquid level gauge), the hydrogen-side water replenishing switch valve 5 and the oxygen-side water replenishing switch valve 7 are opened, and the water replenishing pump 6 injects deionized water into the separator, and closes the corresponding hydrogen-side water replenishing switch valve 5 and oxygen-side water replenishing switch valve 7 after reaching the specified liquid level.

[0073] It should be noted that although hydrogen and oxygen are generated by electrolysis and water is consumed, the liquid level will be low, but the water consumption rate is much lower than the water replenishing rate. Therefore, sometimes it is necessary to close the hydrogen-side water replenishing switch valve 5 and the oxygen-side water replenishing switch valve 7 according to the control requirements of the liquid level height to cut off the water replenishment and prevent the water in the separator from overflowing.

[0074] As Figure 4 shown in the second working mode of the universal electrolytic water hydrogen production test method that can be used in multiple stacks of the present invention, this working mode is the test mode of the pure water hydrogen production electrolytic cell stack, that is, in this working mode, all the electrolytic cell stacks are pure water hydrogen production electrolytic cell stacks. The characteristics of the pure water hydrogen production electrolytic cell stack are that the hydrogen side pressure is slightly higher than the oxygen side, and only the oxygen side of the pure water hydrogen production electrolytic cell stack needs to be filled with water during operation.

[0075] In this working mode, the universal electrolytic water hydrogen production test method that can be used in multiple stacks specifically includes the following steps:

[0076] Step S1’: Connect the general-purpose electrolytic water hydrogen production test system that can be used with multiple stacks to multiple electrolytic cell stacks;

[0077] Step S2’: Open the oxygen-side inlet stop valve 20, oxygen-side outlet stop valve 22, and hydrogen-side outlet stop valve 23 before and after the electrolytic cell stack of the general-purpose electrolytic water hydrogen production test system that can be used with multiple stacks, and close the hydrogen-side inlet stop valve 21; close the hydrogen-side drain valve 17 and oxygen-side drain valve 13, and close the hydrogen-side make-up water switch valve 5 and open the oxygen-side make-up water switch valve 7, so that deionized water is injected into the oxygen separator 9 through the make-up water pump 6 until the liquid level height of the oxygen separator 9 meets the control requirements of the liquid level height indicated by the liquid level signal (that is, it cannot be lower than the low-side detection site of the liquid level gauge and cannot be higher than the make-up water port on the separator). At this time, close the oxygen-side make-up water switch valve 7.

[0078] Among them, if multiple electrolytic cell stacks are to be measured in parallel, open the oxygen-side inlet stop valve 20, oxygen-side outlet stop valve 22, and hydrogen-side outlet stop valve 23 before and after each electrolytic cell stack, and close the hydrogen-side inlet stop valve 21 of each electrolytic cell stack; if a single alkaline electrolytic cell stack is to be measured, only open the oxygen-side inlet stop valve 20, oxygen-side outlet stop valve 22, and hydrogen-side outlet stop valve 23 before and after the electrolytic cell stack to be measured, and close the hydrogen-side inlet stop valve 21 of this electrolytic cell stack.

[0079] Step S3’: Open the oxygen-side raw material circulation pump 15 and oxygen-side return water valve 12, while the hydrogen-side raw material circulation pump 19 and hydrogen-side return water valve 25 remain closed, so that deionized water fills the entire oxygen-side circuit of the electrolytic cell stack and maintains the liquid level of the oxygen separator 9.

[0080] The above steps S1’-S3’ are used to ensure that the oxygen side of the pure water electrolytic cell stack is filled with water.

[0081] Step S4’: After the deionized water fills the entire oxygen-side circuit of the electrolytic cell stack, apply direct current to the measured electrolytic cell stack, and the electrolytic cell stack starts to generate hydrogen and oxygen. Thus, hydrogen entrained with water mist enters the hydrogen separator 3, and oxygen and unreacted deionized water enter the oxygen separator 9.

[0082] Step S5’: The hydrogen-side pressure regulating valve 1 and oxygen-side pressure regulating valve 11 respectively adjust the valve opening according to the data measured by the hydrogen-side pressure sensor 2 and oxygen-side pressure sensor 10 and the required outlet pressure, so as to stabilize the outlet pressure; the hydrogen-side make-up water switch valve 5 remains closed, and the oxygen-side make-up water switch valve 7 is opened or closed according to the liquid level height indicated by the liquid level signal detected by the oxygen-side liquid level gauge 8 and the control requirements of this liquid level height, so as to maintain a stable liquid level in the oxygen separator 9; the hydrogen-side cooler 18 does not work, and the oxygen-side cooler 14 controls its cooling power according to the data detected by the oxygen-side temperature sensor 16 and the required temperature.

[0083] In the step S5’, the required outlet pressure is set according to requirements, generally within 0 - 3.5 MPa. The control requirements for the liquid level height indicated by the liquid level signal are: it cannot be lower than the low-side detection site of the liquid level gauge and cannot be higher than the water replenishment port on the separator. The required temperature is controlled at 60°C - 95°C and set according to requirements.

[0084] Thus, through step S5’, the hydrogen-side pressure of the pure water electrolyzer stack is slightly higher than the oxygen-side pressure.

[0085] In the step S5’, since water is consumed during the reaction of the electrolyzer stack, the makeup water pump 6 is set to supply deionized water in the step S5’. When the liquid level measured by the oxygen-side liquid level gauge 8 is low (for example, lower than the low-side detection site of the liquid level gauge), the oxygen-side makeup water switch valve 7 opens, allowing the makeup water pump 6 to inject deionized water into the oxygen separator, and closing the corresponding oxygen-side makeup water switch valve 7 after reaching the specified liquid level.

[0086] The third and fourth working modes of the test method of the general-purpose electrolytic water hydrogen production test system that can be used in multiple stacks are both test modes for the weak-alkali hydrogen production electrolyzer stack. In the third and fourth working modes, the electrolyzer stack is a weak-alkali hydrogen production electrolyzer stack. The characteristic of the weak-alkali hydrogen production electrolyzer stack is that the hydrogen side and the oxygen side can withstand a certain differential pressure. The difference is that during operation, in the third working mode, both the hydrogen side and the oxygen side are filled with moisture, and the third working mode is the electrolyte double-side circulation test mode for the weak-alkali hydrogen production electrolyzer stack; in the fourth working mode, the hydrogen side of the electrolyzer stack is filled with moisture, which is the electrolyte hydrogen-side circulation test mode for the weak-alkali hydrogen production electrolyzer stack.

[0087] Among them, in the electrolyte double-side circulation test mode of the weak-alkali hydrogen production electrolyzer stack, since both the hydrogen side and the oxygen side need to be filled with moisture, the steps of the corresponding test method are as Figure 3 shown, which are exactly the same as the general-purpose electrolytic water hydrogen production test method that can be used in multiple stacks in the working mode of testing the strong-alkali hydrogen production electrolyzer stack described above. The only difference is that the test objects of the two are different. In the electrolyte double-side circulation test mode of the weak-alkali hydrogen production electrolyzer stack, the electrolyzer stack is a weak-alkali hydrogen production electrolyzer stack.

[0088] In the electrolyte hydrogen-side circulation test mode of the weak-alkali hydrogen production electrolyzer stack, only the hydrogen side needs to be filled with moisture, and the schematic diagram of the test method of the general-purpose electrolytic water hydrogen production test system that can be used in multiple stacks is as Figure 5 shown, which includes the following steps:

[0089] Step S1”: Connect the general-purpose electrolytic water hydrogen production test system described above to multiple electrolyzer stacks;

[0090] Step S2”: Open the hydrogen-side inlet stop valve 21, oxygen-side outlet stop valve 22, and hydrogen-side outlet stop valve 23 before and after the electrolytic cell stack of the multi-stack and general-purpose electrolytic water hydrogen production test system, and close the oxygen-side inlet stop valve 20; close the hydrogen-side drain valve 17 and oxygen-side drain valve 13, and open the hydrogen-side makeup water switch valve 5 and close the oxygen-side makeup water switch valve 7, so that the weak alkaline lye is injected into the hydrogen separator 3 through the makeup water pump 6 until the liquid level height of the hydrogen separator 3 meets the control requirements of the liquid level height indicated by the liquid level signal (that is, it cannot be lower than the low-side detection site of the liquid level gauge and cannot be higher than the makeup water port on the separator), and then close the hydrogen-side makeup water switch valve 5.

[0091] Among them, the weak alkaline lye is a potassium hydroxide solution with a mass fraction of 5%.

[0092] Among them, if multiple electrolytic cell stacks are to be measured in parallel, open the hydrogen-side inlet stop valve 21, oxygen-side outlet stop valve 22, and hydrogen-side outlet stop valve 23 before and after each electrolytic cell stack, and close the oxygen-side inlet stop valve 20 of each electrolytic cell stack; if a single alkaline electrolytic cell stack is to be measured, only need to open the hydrogen-side inlet stop valve 21, oxygen-side outlet stop valve 22, and hydrogen-side outlet stop valve 23 before and after the electrolytic cell stack to be measured, and close the oxygen-side inlet stop valve 20 of this electrolytic cell stack.

[0093] Step S3”: Keep the oxygen-side raw material circulation pump 15 and oxygen-side return water valve 12 closed, and open the hydrogen-side raw material circulation pump 19 and hydrogen-side return water valve 25 to fill the entire hydrogen-side circuit of the electrolytic cell stack with the weak alkaline lye (i.e., raw material water) and maintain the liquid level of the hydrogen separator 3.

[0094] The above steps S1 - S3 are used to ensure that the hydrogen side of the electrolytic cell stack is filled with water.

[0095] Step S4”: After the weak alkaline lye fills the entire hydrogen-side circuit of the electrolytic cell stack, apply direct current to the measured electrolytic cell stack, and the electrolytic cell stack starts to generate hydrogen and oxygen. Thus, hydrogen entrained with water mist enters the hydrogen separator 3, and oxygen and unreacted raw material water enter the oxygen separator 9. That is to say, there is basically no water in the hydrogen separator 3.

[0096] Step S5”: The hydrogen-side pressure regulating valve 1 and oxygen-side pressure regulating valve 11 respectively adjust the valve opening according to the data measured by the hydrogen-side pressure sensor 2 and oxygen-side pressure sensor 10 and the required outlet pressure, so that the hydrogen-side pressure is slightly higher than or equal to the oxygen-side pressure; keep the oxygen-side makeup water switch valve 7 closed, and the hydrogen-side makeup water switch valve 5 is opened or closed according to the liquid level height indicated by the liquid level signal detected by the hydrogen-side liquid level gauge 4 and the control requirements of this liquid level height, so as to maintain a stable liquid level in the hydrogen separator 3; the oxygen-side cooler 14 does not work, and the hydrogen-side cooler 18 controls its cooling power according to the data detected by the hydrogen-side temperature sensor 24 and the required temperature.

[0097] Thus, in step S5”, a certain pressure difference is maintained between the hydrogen separator 3 and the oxygen separator 9.

[0098] In the step S5”, the required outlet pressure is set according to requirements, generally should be between 0 - 3.5 MPa. The control requirements for the liquid level height indicated by the liquid level signal are: it cannot be lower than the low-side detection site of the liquid level gauge and cannot be higher than the water replenishing port on the separator. The required temperature is controlled at 60°C - 95°C and set according to requirements.

[0099] In the step S5”, since water is consumed during the electrolytic cell stack reaction, therefore, in the step S5”, the makeup water pump 6 is set to supply deionized water. When the liquid level measured by the hydrogen-side liquid level gauge 4 is low, the hydrogen-side makeup water switch valve 5 is opened, and the makeup water pump 6 injects deionized water into the hydrogen separator. After reaching the specified liquid level, the corresponding hydrogen-side makeup water switch valve 5 is closed.

[0100] In addition, the step S5” may further include: the oxygen-side drain valve 13 is opened or closed according to the data measured by the oxygen-side liquid level gauge 8 to control its opening and closing to maintain the liquid level, thereby maintaining a stable liquid level in the oxygen separator 9.

[0101] The above is only the preferred embodiment of the present invention and is not used to limit the scope of the present invention. Various changes can be made to the above embodiments of the present invention. All simple, equivalent changes and modifications made according to the claims and the content of the specification of the present invention application fall within the scope of the claims of the present invention patent. Those not described in detail in the present invention are all conventional technical contents.

Claims

1. A general electrolytic water hydrogen production test method that can be used in multiple stacks, characterized in that, It is based on a general electrolytic water hydrogen production test system that can be used with multiple stacks. The general electrolytic water hydrogen production test system is used for multiple electrolytic cell stacks of the same specification, and it includes a hydrogen-side outlet shut-off valve provided at the hydrogen-side outlet of each electrolytic cell stack and an oxygen-side outlet shut-off valve provided at the oxygen-side outlet of each electrolytic cell stack; All the hydrogen-side outlet shut-off valves are connected in parallel and aggregated. A hydrogen-side temperature sensor is installed on the pipeline after the aggregation of the hydrogen-side outlet shut-off valves and is connected to a hydrogen separator. A hydrogen-side pressure regulating valve, a hydrogen-side pressure sensor, and a hydrogen-side water replenishing switch valve are installed on the upper side of the hydrogen separator. A hydrogen-side liquid level gauge is installed on the parallel side of the hydrogen separator. A hydrogen-side drain valve and a hydrogen-side return water valve are installed on the lower side of the hydrogen separator; The rear end of the hydrogen-side return water valve is provided with a hydrogen-side cooler, a hydrogen-side raw material circulation pump, a hydrogen-side inlet shut-off valve, and the hydrogen-side inlet of the electrolytic cell stack connected in sequence; All the oxygen-side outlet shut-off valves are connected in parallel and aggregated. An oxygen-side temperature sensor is installed on the pipeline after the aggregation of the oxygen-side outlet shut-off valves and is connected to an oxygen separator. An oxygen-side pressure regulating valve, an oxygen-side pressure sensor, and an oxygen-side water replenishing switch valve are installed on the upper side of the oxygen separator. An oxygen-side liquid level gauge is installed on the parallel side of the oxygen separator. A hydrogen-side drain valve and an oxygen-side return water valve are installed on the lower side of the oxygen separator; The rear end of the oxygen-side return water valve is provided with an oxygen-side cooler, an oxygen-side raw material circulation pump, an oxygen-side inlet shut-off valve, and the oxygen-side inlet of the electrolytic cell stack connected in sequence; And the general electrolytic water hydrogen production test method can be switched between four working modes. The working modes include a test mode for a strong alkali hydrogen production electrolytic cell stack, a test mode for a pure water hydrogen production electrolytic cell stack, an electrolyte double-side circulation test mode for a weak alkali hydrogen production electrolytic cell stack, and an electrolyte hydrogen-side circulation test mode for a weak alkali hydrogen production electrolytic cell stack; The number of the hydrogen-side inlet shut-off valves, oxygen-side inlet shut-off valves, and electrolytic cell stacks is multiple; Multiple hydrogen-side inlet shut-off valves are connected in parallel with each other through a hydrogen-side raw material circulation pump, and each hydrogen-side inlet shut-off valve is respectively connected to the hydrogen-side inlet of one of the electrolytic cell stacks; Multiple oxygen-side inlet shut-off valves are connected in parallel with each other through an oxygen-side raw material circulation pump, and each oxygen-side inlet shut-off valve is respectively connected to the oxygen-side inlet of one of the electrolytic cell stacks.

2. The general electrolytic water hydrogen production test method capable of being used in multiple stacks according to claim 1, wherein The inlet ends of the hydrogen-side water replenishing switch valve and the oxygen-side water replenishing switch valve are both connected to the same water replenishing pump. The water replenishing pump is set to provide raw water, and the raw water is deionized water or alkali solution.

3. The general electrolytic water hydrogen production test method capable of being used in multiple stacks according to claim 1, characterized in that The hydrogen-side pressure sensor and the hydrogen-side pressure regulating valve are communicatively connected, and the oxygen-side pressure sensor and the oxygen-side pressure regulating valve are communicatively connected, so that the hydrogen-side pressure sensor transmits the pressure signal detected by it to the hydrogen-side pressure regulating valve, and the oxygen-side pressure sensor transmits the pressure signal detected by it to the oxygen-side pressure regulating valve.

4. The general electrolyzed water hydrogen production test method capable of being used in multiple stacks according to claim 1, wherein The hydrogen-side liquid level gauge is communicatively connected to the hydrogen-side water replenishing switch valve and the hydrogen-side drain valve respectively, so that the hydrogen-side liquid level gauge transmits the liquid level signal detected by it to the hydrogen-side water replenishing switch valve and the hydrogen-side drain valve; The oxygen-side liquid level gauge is communicatively connected to the oxygen-side water replenishing switch valve and the oxygen-side drain valve respectively, so that the oxygen-side liquid level gauge transmits the liquid level signal detected by it to the oxygen-side water replenishing switch valve and the oxygen-side drain valve.

5. The general electrolytic water hydrogen production test method capable of being used in multiple stacks according to claim 4, characterized in that The control requirements for the liquid level height indicated by the liquid level signal detected by the hydrogen-side liquid level gauge are as follows: it shall not be lower than the low-side detection site of the hydrogen-side liquid level gauge and shall not be higher than the water replenishment port on the hydrogen separator; And the control requirements for the liquid level height indicated by the liquid level signal detected by the oxygen-side liquid level gauge are as follows: it shall not be lower than the low-side detection site of the oxygen-side liquid level gauge and shall not be higher than the water replenishment port on the oxygen separator.

6. The general electrolytic water hydrogen production test method capable of being used in multiple stacks as claimed in claim 1, wherein The hydrogen-side temperature sensor is communicatively connected to the hydrogen-side cooler, enabling the hydrogen-side temperature sensor to transmit the temperature signal it detects to the hydrogen-side cooler.

7. The general electrolytic water hydrogen production test method capable of being used in multiple stacks according to claim 6, characterized in that The oxygen-side temperature sensor is communicatively connected to the oxygen-side cooler, enabling the oxygen-side temperature sensor to transmit the temperature signal it detects to the oxygen-side cooler.

8. The general electrolyzed water hydrogen production test method capable of being used in multiple stacks according to claim 6, wherein The electrolytic cell stack is connected to a DC power supply, so that the DC power supply provides the direct current required for electrolysis; the DC power supply can record the voltage and current provided to each electrolytic cell stack and can also record the total voltage and total current required for electrolysis.

9. The general electrolytic water hydrogen production test method capable of being used in multiple stacks according to claim 1, characterized in that In the test mode of the strong-alkali hydrogen production electrolytic cell stack, the general-purpose electrolytic water hydrogen production test method that can be used for multiple stacks includes: Step S1: Connect the general-purpose electrolytic water hydrogen production test system that can be used for multiple stacks to multiple electrolytic cell stacks; Step S2: Open the oxygen-side inlet stop valve, hydrogen-side inlet stop valve, oxygen-side outlet stop valve, and hydrogen-side outlet stop valve before and after the electrolytic cell stack of the general-purpose electrolytic water hydrogen production test system that can be used for multiple stacks; close the hydrogen-side drain valve and oxygen-side drain valve, and open the hydrogen-side water replenishment switch valve and oxygen-side water replenishment switch valve so that the strong-alkali solution is injected into the hydrogen separator and oxygen separator until the control requirements for the liquid level height indicated by the liquid level signal are met, and then close the hydrogen-side water replenishment switch valve and oxygen-side water replenishment switch valve; Step S3: Open the oxygen-side raw material circulation pump, hydrogen-side raw material circulation pump, oxygen-side return water valve, and hydrogen-side return water valve; Step S4: After the strong-alkali solution fills the interior of the general-purpose electrolytic water hydrogen production test system that can be used for multiple stacks, apply direct current to the measured electrolytic cell stack; Step S5: The hydrogen-side pressure regulating valve and oxygen-side pressure regulating valve respectively adjust the valve opening according to the data measured by the hydrogen-side pressure sensor and oxygen-side pressure sensor and the required outlet pressure; the hydrogen-side water replenishment switch valve and oxygen-side water replenishment switch valve respectively open or close according to the liquid level height indicated by the liquid level signals detected by the hydrogen-side liquid level gauge and oxygen-side liquid level gauge and the control requirements for this liquid level height; the hydrogen-side cooler and oxygen-side cooler respectively control their cooling power according to the data detected by the hydrogen-side temperature sensor and oxygen-side temperature sensor and the required temperature; In the test mode of the pure-water hydrogen production electrolytic cell stack, the general-purpose electrolytic water hydrogen production test method that can be used for multiple stacks includes: Step S1': Connect the general-purpose electrolytic water hydrogen production test system that can be used for multiple stacks to multiple electrolytic cell stacks; Step S2': Open the oxygen-side inlet isolation valve, oxygen-side outlet isolation valve, and hydrogen-side outlet isolation valve before and after the electrolytic cell stack of the multi-stack usable general-purpose electrolytic water hydrogen production test system, and close the hydrogen-side inlet isolation valve; close the hydrogen-side drain valve and oxygen-side drain valve, and close the hydrogen-side makeup water switch valve and open the oxygen-side makeup water switch valve so that deionized water is injected into the oxygen separator until the liquid level height of the oxygen separator meets the control requirements of the liquid level height indicated by the liquid level signal, and then close the oxygen-side makeup water switch valve; Step S3': Open the oxygen-side raw material circulation pump and oxygen-side return water valve, while keeping the hydrogen-side raw material circulation pump and hydrogen-side return water valve closed; Step S4': When deionized water fills the entire oxygen-side circuit of the electrolytic cell stack, apply direct current to the measured electrolytic cell stack; Step S5': The hydrogen-side pressure regulating valve and oxygen-side pressure regulating valve respectively adjust the valve opening according to the data measured by the hydrogen-side pressure sensor and oxygen-side pressure sensor and the required outlet pressure; the hydrogen-side makeup water switch valve remains closed, and the oxygen-side makeup water switch valve is opened or closed according to the liquid level height indicated by the liquid level signal detected by the oxygen-side liquid level gauge and the control requirements of this liquid level height; the hydrogen-side cooler does not work, and the oxygen-side cooler controls its cooling power according to the data detected by the oxygen-side temperature sensor and the required temperature; In the electrolyte double-side circulation test mode of the weak-alkali hydrogen production electrolytic cell stack, the multi-stack usable general-purpose electrolytic water hydrogen production test method is the same as the multi-stack usable general-purpose electrolytic water hydrogen production test method in the test mode of the strong-alkali hydrogen production electrolytic cell stack; In the electrolyte hydrogen-side circulation test mode of the weak-alkali hydrogen production electrolytic cell stack, the multi-stack usable general-purpose electrolytic water hydrogen production test method includes: Step S1": Connect the multi-stack usable general-purpose electrolytic water hydrogen production test system to multiple electrolytic cell stacks; Step S2": Open the hydrogen-side inlet isolation valve, oxygen-side outlet isolation valve, and hydrogen-side outlet isolation valve before and after the electrolytic cell stack of the multi-stack usable general-purpose electrolytic water hydrogen production test system, and close the oxygen-side inlet isolation valve; close the hydrogen-side drain valve and oxygen-side drain valve, and open the hydrogen-side makeup water switch valve and close the oxygen-side makeup water switch valve so that weak-alkali solution is injected into the hydrogen separator until the liquid level height of the hydrogen separator meets the control requirements of the liquid level height indicated by the liquid level signal, and then close the hydrogen-side makeup water switch valve; Step S3": Keep the oxygen-side raw material circulation pump and oxygen-side return water valve closed, and open the hydrogen-side raw material circulation pump and hydrogen-side return water valve; Step S4": When the weak-alkali solution fills the entire hydrogen-side circuit of the electrolytic cell stack, apply direct current to the measured electrolytic cell stack; Step S5": The hydrogen-side pressure regulating valve and oxygen-side pressure regulating valve respectively adjust the valve opening according to the data measured by the hydrogen-side pressure sensor and oxygen-side pressure sensor and the required outlet pressure; the oxygen-side makeup water switch valve remains closed, and the hydrogen-side makeup water switch valve is opened or closed according to the liquid level height indicated by the liquid level signal detected by the hydrogen-side liquid level gauge and the control requirements of this liquid level height; the oxygen-side cooler does not work, and the hydrogen-side cooler controls its cooling power according to the data detected by the hydrogen-side temperature sensor and the required temperature.

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