Water electrolysis hydrogen production system

Abstract

The invention discloses a water electrolysis hydrogen production system which comprises an electrolysis hydrogen production unit, a water supplementing amount control unit and a temperature control unit, the water supplementing amount control unit comprises a water return device, an oxygen-water separator, a detection assembly and a control valve assembly, and a water supply main pipe and an oxygen outlet pipe of an electrolysis bath are connected with the oxygen-water separator; the control valve assembly controls connection and disconnection of the water return device and the oxygen-water separator, connection and disconnection of a water inlet pipe of the water return device and starting and stopping of the electrolytic pump, the temperature control unit comprises a cooling circulation system and a heat source device arranged in the oxygen-water separator, a hot side circulation pipeline of the cooling circulation system is connected with the oxygen separator, and a cooling pump is arranged on an inlet pipeline. The cold side circulation pipeline is provided with a temperature adjusting valve, and the detection assembly controls starting and stopping of the heat source device, starting and stopping of the cooling pump, on-off of the temperature adjusting valve and starting and stopping of the electrolytic pump. According to the water electrolysis hydrogen production system, the water quantity required by the system and the initial starting temperature of the electrolytic bath can be guaranteed, the power consumption waiting for temperature rise is saved, and the whole-stage whole machine hydrogen production efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen production, and in particular to a water electrolysis hydrogen production system. Background Art

[0002] At present, the domestic hydrogen production system industry is developing rapidly. Different companies have different technical routes for hydrogen production systems. Among them, if the electrolyzer in the water electrolysis hydrogen production device needs to be started and stopped quickly to adapt to the changes in wind and solar energy, the water supply temperature must meet the technical requirements without affecting the life of the electrolyzer. The conditions are relatively harsh. Many hydrogen production systems often need to run at low load for a period of time to raise the water temperature in the system to the rated temperature, and add new water to offset the increased conductivity of the circulating water during the initial electrolysis process. This process often takes 30-60 minutes. The amount of hydrogen produced in the system at the beginning is low and cannot meet the minimum regeneration gas volume requirement of the purification device. The hydrogen that cannot be purified needs to be emptied. This phenomenon will reduce the efficiency of hydrogen production and seriously affect the economy of the hydrogen production system. In addition, for some pressure systems, when it is necessary to replenish the consumed water in the high-pressure system, most systems use continuously running high-pressure water pumps to maintain water supply balance. When the water pump fails unexpectedly, it is easy to cause the high pressure behind the pump, resulting in the phenomenon that the medium at the rear end of the pump flows back to the front of the pump, increasing the safety risk of the system. Summary of the invention

[0003] The technical problem to be solved by the present invention is that, in view of the defects and shortcomings of the prior art, a water electrolysis hydrogen production system is proposed, in which the water replenishment control unit of the water electrolysis hydrogen production system can detect the liquid level values ​​in the water return device and the oxygen-water separator in real time and automatically replenish water to ensure the water volume required for system operation. The temperature control unit can use the heat source device and the cooling circulation system to adjust the pure water temperature of the system to ensure the initial startup temperature of the electrolytic cell, realize the startup of the electrolytic cell and quickly set it to the rated current. The produced hydrogen is directly introduced into the separation and purification device, saving the power consumption of waiting for temperature rise, reducing the amount of hydrogen venting during the waiting period, and improving the hydrogen production efficiency of the whole machine in all stages.

[0004] The water electrolysis hydrogen production system of the embodiment of the present invention includes: an electrolysis hydrogen production unit, the electrolysis hydrogen production unit includes an electrolyzer, a water supply main pipe, an oxygen outlet pipe and a separation and purification device, the separation and purification device is used to receive the hydrogen generated by the electrolyzer; a water replenishment control unit, the water replenishment control unit includes a water return device, an oxygen-water separator, a detection component and a control valve component, the water return device is connected to the water replenishment pipe inlet of the hydrogen-water separator and is externally connected to a water inlet pipe, the water supply main pipe is connected to the water supply outlet pipe of the oxygen-water separator and is provided with an electrolysis pump, the oxygen outlet pipe is connected to the water return pipe of the oxygen-water separator, the detection component is used to detect the liquid level, temperature and pressure of the oxygen-water separator and detect the liquid level of the water return device, and the control valve component is connected according to the The detection information of the detection component controls the on-off of the water return device and the oxygen-water separator, the on-off of the water inlet pipe of the water return device, and the start-stop of the electrolytic pump; the temperature control unit, the temperature control unit includes a heat source device and a cooling circulation system, the heat source device is arranged in the oxygen-water separator, the cooling circulation system includes a heat exchanger, a hot side circulation pipeline and a cold side circulation pipeline, the hot side circulation pipeline is connected to the oxygen separator, the cold side circulation pipeline is passed through the cooling medium and a temperature regulating valve is arranged on the cold side circulation pipeline, and a cooling pump is arranged on the inlet pipe of the hot side circulation pipeline, and the detection component controls the start-stop of the heat source device, the start-stop of the cooling pump, the on-off of the temperature regulating valve, and the start-stop of the electrolytic pump according to the detection information.

[0005] In the water electrolysis hydrogen production system of the embodiment of the present invention, the water replenishment control unit can detect the liquid level values ​​in the water return device and the oxygen-water separator in real time and automatically replenish water to ensure the water volume required for system operation. The temperature control unit can use the heat source device and the cooling circulation system to adjust the system pure water temperature to ensure the initial startup temperature of the electrolytic cell, realize the startup of the electrolytic cell and quickly set it to the rated current. The produced hydrogen is directly introduced into the separation and purification device, saving the power consumption of waiting for temperature rise, reducing the amount of hydrogen venting during the waiting period, and improving the hydrogen production efficiency of the whole machine in all stages.

[0006] In some embodiments, the detection component includes a first liquid level gauge, a second liquid level gauge, a first pressure sensor, a second pressure sensor, a first temperature sensor and a second temperature sensor. The first liquid level gauge and the second liquid level gauge are used to detect the liquid levels of the water return device and the oxygen-water separator, respectively. The first pressure sensor is used to detect the pressure of the water supply pipe of the oxygen-water separator. The second pressure sensor is used to detect the pressure in the oxygen-water separator. The first temperature sensor and the second temperature sensor respectively detect the temperatures of the oxygen-water separator and the main water supply pipe.

[0007] In some embodiments, it is characterized in that the control valve assembly includes an automatic water replenishment switch valve, a water replenishment pump, a liquid level regulating valve and an automatic switch valve after the water replenishment pump, the automatic water replenishment switch valve is arranged on the water inlet pipe of the water return device, the water replenishment pump, the liquid level regulating valve and the automatic switch valve after the water replenishment pump are arranged on the water replenishment pipe of the hydrogen-water separator and are arranged in sequence along the outlet side of the water return device.

[0008] In some embodiments, the first liquid level meter interlock controls the switch of the water replenishment automatic switch valve;

[0009] The second liquid level meter interlock controls the switch of the water supply pump;

[0010] The water supply pump is interlocked with the first pressure sensor to automatically adjust the frequency;

[0011] The water supply pump automatic switch valve is interlocked with the first pressure sensor and the second pressure sensor;

[0012] The liquid level regulating valve is interlocked with the second liquid level gauge to adjust the valve opening.

[0013] In some embodiments, the first temperature sensor is interlocked with the heat source device, the cooling pump, and the electrolytic pump, and the second temperature sensor is interlocked with the temperature regulating valve.

[0014] In some embodiments, the oxygen-water separator is further provided with a drain pipe, the drain pipe is provided with a drain valve, and the second liquid level meter interlock controls the switch of the drain valve.

[0015] In some embodiments, the water electrolysis hydrogen production system also includes a water quality control unit, which includes a desalination pipeline and a desalination device arranged thereon, and the desalination pipeline is connected in parallel to the hot side circulation pipeline and is provided with a flow regulating valve that can be turned on and off.

[0016] In some embodiments, a first conductivity meter is provided on the water supply main, and the first conductivity meter controls the on-off of the flow regulating valve and the start-stop of the desalination device according to the detected conductivity value.

[0017] In some embodiments, the desalination pipeline includes an inlet branch and an outlet branch at the inlet and outlet ends of the desalination device respectively, the flow regulating valve is arranged on the inlet branch, a desalination flowmeter is arranged on the outlet branch, and the desalination flowmeter is interlocked with the flow regulating valve to adjust the flow rate to maintain it within a set range.

[0018] In some embodiments, a second conductivity meter is further provided on the outlet branch line. When the second conductivity meter triggers a high conductivity limit, an alarm prompt is given that the desalination device and the flow regulating valve should be inspected and maintained. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of a water electrolysis hydrogen production system according to an embodiment of the present invention.

[0020] Reference numerals:

[0021] Return device 1; water supply pump 2; liquid level regulating valve 3; automatic switch valve after water supply pump 4; oxygen-water separator 5; heat source device 6; cooling pump 7; heat exchanger 8; flow regulating valve 9; desalination device 10; temperature regulating valve 11; electrolytic pump 12; electrolytic cell 13; separation and purification device 14; first liquid level gauge 15; second liquid level gauge 16; first pressure sensor 17; second pressure sensor 18; first temperature sensor 19; second temperature sensor 20; first conductivity meter 21; second conductivity meter 22; water supply automatic switch valve 23; automatic drain valve 24; desalination flow meter 25. DETAILED DESCRIPTION

[0022] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0023] like Figure 1 As shown, the water electrolysis hydrogen production system of the embodiment of the present invention includes an electrolysis hydrogen production unit, a water replenishment control unit and a temperature control unit.

[0024] Specifically, the electrolytic hydrogen production unit includes an electrolyzer 13, a water supply main, an oxygen outlet pipe and a separation and purification device 14. The separation and purification device 14 is used to receive the hydrogen generated by the electrolyzer 13. The water replenishment control unit includes a water return device 1, an oxygen-water separator 5, a detection component and a control valve component. The water return device 1 is connected to the water replenishment pipe inlet of the hydrogen-water separator and is externally connected to the water inlet pipe. The water supply main is connected to the water supply outlet pipe of the oxygen-water separator 5 and is provided with an electrolytic pump 12. The oxygen outlet pipe is connected to the water return pipe of the oxygen-water separator 5. The detection component is used to detect the liquid level, temperature and pressure of the oxygen-water separator 5 and detect the liquid level of the water return device 1. The control valve component controls the on-off of the water return device 1 and the oxygen-water separator 5, the on-off of the water inlet pipe of the water return device 1, and the start and stop of the electrolytic pump 12 according to the detection information of the detection component.

[0025] Specifically, Figure 1 As shown, the external water inlet pipe of the water return device 1 can be connected to pure water. When the detection component detects that the liquid level value in the water return device 1 triggers the water replenishment limit, the control valve component can be used to start automatic water replenishment. When the liquid level value triggers the water stop limit, the control valve component is used to close the water replenishment, thereby ensuring that the pure water level of the water return device 1 is within the normal allowable range. In other words, the water replenishment control unit can ensure the water demand for system operation in real time.

[0026] Furthermore, when the liquid level value in the oxygen-water separator 5 triggers the water replenishment limit, the control component can be used to start the water return device 1 to replenish water toward the oxygen-water separator 5. When the liquid level value in the oxygen-water separator 5 triggers the stop water replenishment limit, the control valve component can be used to block the water supply from the water return device 1 to the oxygen-water separator 5 to ensure that the liquid level of the oxygen-water separator 5 is within the normal operating range.

[0027] Furthermore, if Figure 1 As shown, the temperature control unit includes a heat source device 6 and a cooling circulation system. The heat source device 6 is arranged in the oxygen-water separator 5. The cooling circulation system includes a heat exchanger 8, a hot side circulation pipeline and a cold side circulation pipeline. The hot side circulation pipeline is connected to the oxygen separator. The cooling medium is introduced into the cold side circulation pipeline and a temperature regulating valve 11 is arranged on the cold side circulation pipeline. A cooling pump 7 is arranged on the inlet pipe of the hot side circulation pipeline. The detection component controls the start and stop of the heat source device 6, the start and stop of the cooling pump 7, the on and off of the temperature regulating valve 11 and the start and stop of the electrolytic pump 12 according to the detection information.

[0028] Specifically, when the detection component detects that the temperature of the oxygen-water separator 5 triggers the low temperature limit or reaches the specified static time, the heat source device 6, the cooling pump 7 and the electrolytic pump 12 will be turned on. After the cooling pump 7 and the electrolytic pump 12 are running, the temperature of the pure water in the system will be neutralized, and the system will increase the temperature of the pure water through the heat source device 6;

[0029] Furthermore, when the detection component detects that the temperature of the oxygen-water separator 5 triggers the high temperature limit, the heat source device 6, the cooling pump 7 and the electrolytic pump 12 are turned off to ensure that the temperature in the system is within the set range; and when the temperature triggers the high temperature limit, the temperature regulating valve 11 is opened, and the cooling medium cools the system pure water through the heat exchanger 8. When the temperature triggers the low temperature limit, the temperature regulating valve 11 is closed to ensure that the temperature in the system is within the allowable range. Thus, the temperature control unit can ensure the initial startup temperature of the electrolytic cell 13, realize the startup of the electrolytic cell 13 and quickly set it to the rated current, and the produced hydrogen is directly introduced into the separation and purification device 14, saving the power consumption of waiting for the temperature rise, and reducing the amount of hydrogen venting during the waiting period, thereby improving the hydrogen production efficiency of the whole machine at all stages.

[0030] In the water electrolysis hydrogen production system of the embodiment of the present invention, the water replenishment control unit can detect the liquid level values ​​in the water return device 1 and the oxygen-water separator 5 in real time and automatically replenish water to ensure the water volume required for system operation. The temperature control unit can use the heat source device 6 and the cooling circulation system to adjust the system pure water temperature to ensure the initial startup temperature of the electrolytic cell 13, realize the startup of the electrolytic cell 13 and quickly set it to the rated current. The produced hydrogen is directly introduced into the separation and purification device 14, saving the power consumption of waiting for the temperature rise, and reducing the amount of hydrogen venting during the waiting period, thereby improving the hydrogen production efficiency of the whole machine in all stages.

[0031] In some embodiments, Figure 1As shown, the detection component includes a first liquid level gauge 15, a second liquid level gauge 16, a first pressure sensor 17, a second pressure sensor 18, a first temperature sensor 19 and a second temperature sensor 20. The first liquid level gauge 15 and the second liquid level gauge 16 are respectively used to detect the liquid levels of the water return device 1 and the oxygen-water separator 5. The first pressure sensor 17 is used to detect the pressure of the water supply pipe of the oxygen-water separator 5. The second pressure sensor 18 is used to detect the pressure in the oxygen-water separator 5. The first temperature sensor 19 and the second temperature sensor 20 respectively detect the temperature of the oxygen-water separator 5 and the main water supply pipe. The control valve component includes a water supply automatic switch valve 23, a water supply pump 2, a liquid level regulating valve 3 and an automatic switch valve 4 after the water supply pump. The water supply automatic switch valve 23 is arranged on the water inlet pipe of the water return device 1, and the water supply pump 2, the liquid level regulating valve 3 and the automatic switch valve 4 after the water supply pump are arranged on the water supply pipe of the hydrogen-water separator and are arranged in sequence along the outlet side of the water return device 1.

[0032] Furthermore, the first liquid level meter 15 interlocks and controls the switch of the water replenishment automatic switch valve 23. Specifically, the pure water provided by the external public works is delivered to the water replenishment automatic switch valve 23, and the liquid level value of the first liquid level meter 15 interlocks and controls the opening and closing of the water replenishment automatic switch valve 23. When the liquid level of the first liquid level meter 15 triggers the liquid level replenishment limit, the interlock water replenishment automatic switch valve 23 is opened, and when the liquid level of the first liquid level meter 15 triggers the stop water replenishment limit, the interlock water replenishment automatic switch valve 23 is closed, so as to ensure that the pure water level of the return water device 1 is within the normal allowable range.

[0033] Furthermore, the second liquid level meter 16 interlocks and controls the switch of the water replenishment pump 2. Specifically, when the liquid level of the second liquid level meter 16 triggers the water replenishment limit, the interlock water replenishment pump 2 starts, and when the liquid level of the second liquid level meter 16 triggers the stop water replenishment limit, the interlock water replenishment pump 2 is turned off to provide power for water replenishment.

[0034] Furthermore, the water replenishment pump 2 interlocks with the first pressure sensor 17 to automatically adjust the frequency to keep the first pressure sensor 17 higher than the fixed value set by the second pressure sensor 18, ensuring that water replenishment can continue normally when the pressure of the oxygen-water separator 5 changes, and the power source is stable.

[0035] Furthermore, the automatic switch valve of the water supply pump 2 is interlocked with the first pressure sensor 17 and the second pressure sensor 18. Specifically, when the first pressure sensor 17 is higher than the second pressure sensor 18, the automatic switch valve 4 is opened after the water supply pump is interlocked, and when the first pressure sensor 17 is lower than the second pressure sensor 18, the automatic switch valve 4 is closed after the water supply pump is interlocked, so as to prevent the high-pressure oxygen / water in the oxygen-water separator 5 from flowing back into the water return device 1.

[0036] Furthermore, the liquid level regulating valve 3 is interlocked with the second liquid level meter 16 to adjust the valve opening. Thus, the valve opening can be adjusted in real time according to the set liquid level control value of the second liquid level meter 16 to maintain a stable liquid level.

[0037] Further, the first temperature sensor 19 interlocks the heat source device 6, the cooling pump 7 and the electrolytic pump 12, and the second temperature sensor 20 interlocks the temperature regulating valve 11. Specifically, when the first temperature sensor 19 triggers the low temperature limit or reaches the specified static time, the heat source device 6, the cooling pump 7 and the electrolytic pump 12 will be interlocked to open. After the cooling pump 7 and the electrolytic pump 12 are running, the temperature of the pure water in the system will be neutralized. The system will increase the temperature of the pure water in the system through the heat source device 6. When the second temperature sensor 20 triggers the high temperature limit, the heat source device 6, the cooling pump 7 and the electrolytic pump 12 will be interlocked to close to ensure that the temperature in the system is within the set range; when the second temperature sensor 20 triggers the high temperature limit, the interlock temperature regulating valve 11 is opened to automatically adjust the opening, and the cooling water cools the system pure water through the heat exchanger 8. When the second temperature sensor 20 triggers the low temperature limit, the interlock temperature regulating valve 11 is closed to ensure that the temperature in the system is within the allowable range.

[0038] In some embodiments, the oxygen-water separator 5 is further provided with a drain pipe, and the drain pipe is provided with a drain valve, and the second liquid level gauge 16 interlocks and controls the switch of the drain valve. Specifically, when the second liquid level gauge 16 triggers the drain limit interlock to automatically open the drain valve 24, the second liquid level gauge 16 triggers the stop drain limit interlock to automatically close the drain valve 24, thereby ensuring that the liquid level of the oxygen-water separator 5 is within the normal operating range.

[0039] In some embodiments, the water electrolysis hydrogen production system also includes a water quality control unit, which includes a desalination pipeline and a desalination device 10 arranged thereon. The desalination pipeline is connected in parallel to the hot side circulation pipeline and is provided with a flow regulating valve 9 that can be turned on and off.

[0040] Specifically, a first conductivity meter 21 is provided on the water supply main, and the first conductivity meter 21 controls the on / off of the flow regulating valve 9 and the start / stop of the desalination device 10 according to the detected conductivity value. When the first conductivity meter 21 triggers the conductivity high limit interlock flow regulating valve 9 and desalination device 10 to open, and when the first conductivity meter 21 triggers the conductivity low limit interlock flow regulating valve 9 and desalination device 10 to close, the required water quality of the electrolytic cell 13 at the beginning and during operation can be guaranteed, and the single-cell voltage of the electrolytic cell 13 can be reduced, the service life of the electrolytic cell 13 can be extended, and the electrolysis efficiency can be improved.

[0041] Furthermore, the desalination pipeline includes an inlet branch and an outlet branch at the inlet and outlet ends of the desalination device 10 respectively, a flow regulating valve 9 is arranged on the inlet branch, a desalination flowmeter 25 is arranged on the outlet branch, and the desalination flowmeter 25 is interlocked with the flow regulating valve 9 to adjust the flow to maintain it within the set range.

[0042] Furthermore, a second conductivity meter 22 is provided on the outlet branch. When the second conductivity meter 22 triggers the high limit value of conductivity, an alarm prompt is given that the desalination device 10 and the flow control valve 9 should be inspected and maintained.

[0043] In addition, it should be noted that, in the above-mentioned water quality control unit and temperature control unit, if the value of the first temperature sensor 19 in the temperature control unit meets the temperature setting requirement range, but the value of the first conductivity meter 21 is not within the setting requirement range, the heat source device 6 in the temperature control unit will stop running, and the electrolytic pump 12 and the cooling pump 7 will continue to run until the value of the first conductivity meter 21 reaches the setting requirement range, and the electrolytic pump 12 and the cooling pump 7 can stop running; if the value of the first conductivity meter 21 in the water quality control unit meets the conductivity setting requirement range, but the value of the first temperature sensor 19 is not within the setting requirement range, the desalination device 10 and the flow regulating valve 9 in the water quality control unit are closed, and the electrolytic pump 12 and the cooling pump 7 will continue to run until the value of the first temperature sensor 19 reaches the setting requirement range, and the electrolytic pump 12 and the cooling pump 7 can stop running.

[0044] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0045] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0046] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0048] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0049] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A water electrolysis hydrogen production system, characterized in that: include: An electrolytic hydrogen production unit, the electrolytic hydrogen production unit comprising an electrolytic cell, a water supply main, an oxygen outlet pipe and a separation and purification device, the separation and purification device being used to receive the hydrogen produced by the electrolytic cell; A water replenishment control unit, the water replenishment control unit comprises a water return device, an oxygen-water separator, a detection component and a control valve component, the water return device is connected to the water replenishment pipe inlet of the hydrogen-water separator and is externally connected to a water inlet pipe, the water supply main pipe is connected to the water supply outlet pipe of the oxygen-water separator and is provided with an electrolytic pump, the oxygen outlet pipe is connected to the water return pipe of the oxygen-water separator, the detection component is used to detect the liquid level, temperature and pressure of the oxygen-water separator and the liquid level of the water return device, and the control valve component controls the on-off of the water return device and the oxygen-water separator, the on-off of the water inlet pipe of the water return device and the start and stop of the electrolytic pump according to the detection information of the detection component; A temperature control unit, the temperature control unit includes a heat source device and a cooling circulation system, the heat source device is arranged in the oxygen-water separator, the cooling circulation system includes a heat exchanger, a hot side circulation pipeline and a cold side circulation pipeline, the hot side circulation pipeline is connected to the oxygen separator, the cold side circulation pipeline is passed through a cooling medium and a temperature regulating valve is arranged on the cold side circulation pipeline, a cooling pump is arranged on the inlet pipe of the hot side circulation pipeline, and the detection component controls the start and stop of the heat source device, the start and stop of the cooling pump, the on and off of the temperature regulating valve and the start and stop of the electrolysis pump according to the detection information.

2. The water electrolysis hydrogen production system according to claim 1, characterized in that: The detection component includes a first liquid level gauge, a second liquid level gauge, a first pressure sensor, a second pressure sensor, a first temperature sensor and a second temperature sensor. The first liquid level gauge and the second liquid level gauge are respectively used to detect the liquid levels of the water return device and the oxygen-water separator. The first pressure sensor is used to detect the pressure of the water supply pipe of the oxygen-water separator. The second pressure sensor is used to detect the pressure in the oxygen-water separator. The first temperature sensor and the second temperature sensor respectively detect the temperatures of the oxygen-water separator and the main water supply pipe.

3. The water electrolysis hydrogen production system according to claim 2, characterized in that: The control valve assembly includes an automatic water replenishment switch valve, a water replenishment pump, a liquid level regulating valve and an automatic water replenishment pump rear switch valve. The automatic water replenishment switch valve is arranged on the water inlet pipe of the water return device, and the water replenishment pump, the liquid level regulating valve and the automatic water replenishment pump rear switch valve are arranged on the water replenishment pipe of the hydrogen-water separator and are arranged in sequence along the outlet side of the water return device.

4. The water electrolysis hydrogen production system according to claim 3, characterized in that: The first liquid level meter interlock controls the switch of the water replenishment automatic switch valve; The second liquid level meter interlock controls the switch of the water supply pump; The water supply pump is interlocked with the first pressure sensor to automatically adjust the frequency; The water supply pump automatic switch valve is interlocked with the first pressure sensor and the second pressure sensor; The liquid level regulating valve is interlocked with the second liquid level gauge to adjust the valve opening.

5. The water electrolysis hydrogen production system according to claim 3, characterized in that: The first temperature sensor is interlocked with the heat source device, the cooling pump and the electrolytic pump, and the second temperature sensor is interlocked with the temperature regulating valve.

6. The water electrolysis hydrogen production system according to claim 3, characterized in that: The oxygen-water separator is also provided with a drain pipe, and the drain pipe is provided with a drain valve, and the second liquid level meter interlock controls the switch of the drain valve.

7. The water electrolysis hydrogen production system according to claim 1, characterized in that: It also includes a water quality control unit, which includes a desalination pipeline and a desalination device arranged thereon. The desalination pipeline is connected in parallel to the hot side circulation pipeline and is provided with a flow regulating valve that can be turned on and off.

8. The water electrolysis hydrogen production system according to claim 7, characterized in that: The water supply main is provided with a first conductivity meter, and the first conductivity meter controls the on-off of the flow regulating valve and the start and stop of the desalination device according to the detected conductivity value.

9. The water electrolysis hydrogen production system according to claim 8, characterized in that: The desalination pipeline includes an inlet branch and an outlet branch respectively at the inlet end and the outlet end of the desalination device. The flow regulating valve is arranged on the inlet branch. A desalination flowmeter is arranged on the outlet branch. The desalination flowmeter is interlocked with the flow regulating valve to adjust the flow rate and maintain it within a set range.

10. The water electrolysis hydrogen production system according to claim 9, characterized in that: The outlet branch is also provided with a second conductivity meter, and when the second conductivity meter triggers the high limit value of conductivity, it gives an alarm prompt that the desalination device and the flow regulating valve should be inspected and maintained.

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