Water electrolysis hydrogen production system

Abstract

The utility model provides a system for producing hydrogen by electrolyzing water. The system comprises a liquid source; the electrolytic cell assembly is provided with a liquid inlet; an outlet of the main water inlet pipeline is communicated with the liquid inlet, and an inlet is communicated with a liquid source; the heat exchanger is arranged on the main water inlet pipeline; an outlet of the bypass branch communicates with the liquid inlet, and an inlet of the bypass branch communicates with a bypass branch connecting point of the main water inlet pipeline, so that the bypass branch and the heat exchanger are arranged in parallel; a flowmeter and an adjusting assembly. By arranging the bypass branch, heat exchange can be carried out without a heat exchanger during low-flow operation and test, so that accurate temperature control of water is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrogen production equipment, in particular to a water electrolysis hydrogen production system. Background Art

[0002] PEM (proton exchange membrane) water electrolysis hydrogen production system is a common hydrogen production equipment. It uses a proton membrane electrolyzer to electrolyze water and can physically separate high-purity hydrogen and oxygen. The PEM water electrolysis hydrogen production system consists of four parts: water treatment system, gas treatment system, electrolyzer system and voltage conversion system; its working principle is to pass water through the proton membrane in the electrolyzer. Under the action of direct current, water molecules are decomposed into hydrogen ions and hydroxide ions. Hydrogen ions pass through the proton membrane to the cathode side and combine with electrons to form hydrogen, while hydroxide ions combine with electrons on the anode side to form oxygen and water.

[0003] Therefore, water is crucial in the hydrogen production process, and how to ensure that the supplied water meets the requirements of the hydrogen production process (especially the temperature requirements) is crucial. Utility Model Content

[0004] The utility model provides a water electrolysis hydrogen production system to solve the problem that the water electrolysis hydrogen production system in the prior art cannot effectively meet the temperature requirement for water in the hydrogen production process.

[0005] In order to solve the above problems, the utility model provides a water electrolysis hydrogen production system, comprising: a liquid source, used to provide liquid required for electrolysis, the liquid including water; an electrolyzer assembly, used to electrolyze water to produce hydrogen, and having a liquid inlet; a main water inlet pipeline, the outlet of which is connected to the liquid inlet, and the inlet is connected to the liquid source; a heat exchanger, arranged on the main water inlet pipeline, and used to exchange heat with the liquid in the main water inlet pipeline to regulate the liquid temperature; a bypass branch, the outlet of which is connected to the liquid inlet and the inlet of which is connected to the bypass branch connection point of the main water inlet pipeline, so that the bypass branch and the heat exchanger are arranged in parallel; a flow meter, arranged between the bypass branch connection point and the liquid source, and used to measure the flow rate of liquid flowing out of the liquid source; and a regulating assembly, used to cooperate with the main water inlet pipeline and the bypass branch to regulate the flow direction of the liquid.

[0006] Furthermore, when the flow meter measures the flow rate of liquid flowing out of the liquid source to be lower than the set standard, the regulating component regulates the liquid to enter the liquid inlet through the bypass branch; when the flow meter measures the flow rate of liquid flowing out of the liquid source to be not lower than the set standard, the regulating component regulates the liquid to enter the liquid inlet through the main water inlet pipeline and the heat exchanger.

[0007] Further, the regulating component includes a first valve and a second valve; the first valve is arranged on the bypass branch; the second valve is arranged at the inlet end of the heat exchanger; wherein the first valve and the second valve are both manual valves; or, the regulating component includes a controller, a first valve and a second valve; the first valve is arranged on the bypass branch; the second valve is arranged between the inlet end of the heat exchanger and the bypass branch connection point; wherein the first valve and the second valve are both solenoid valves, and are electrically connected to the controller respectively; the controller adjusts the flow direction of the liquid by controlling the opening and closing of the first valve and the second valve; or, the regulating component includes a three-way valve and a controller, the three-way valve is arranged at the bypass branch connection point, the inlet of the three-way valve is connected to the outlet of the flowmeter, the first outlet of the three-way valve is connected to the main water inlet pipeline, and the second outlet of the three-way valve is connected to the bypass branch; the controller is electrically connected to the three-way valve for controlling the on and off of the three-way valve.

[0008] Furthermore, the water electrolysis hydrogen production system also includes a heating component, which is arranged on the electrolyzer component and is used to heat the liquid entering the liquid inlet.

[0009] Furthermore, the water electrolysis hydrogen production system also includes a bubble sensor, which is arranged on the main water inlet pipeline and the bypass branch to detect whether there are bubbles in the liquid.

[0010] Furthermore, the main water inlet pipeline includes an inlet section, an intermediate section and an outlet section which are connected in sequence, the inlet of the main water inlet pipeline is located on the inlet section, and the outlet of the main water inlet pipeline is located on the outlet section; wherein the heat exchanger is arranged on the intermediate section; the inlet of the bypass branch is connected to the inlet section, and the outlet of the bypass branch is connected to the outlet section, so that the bypass branch is arranged in parallel with the intermediate section.

[0011] Furthermore, the water electrolysis hydrogen production system also includes a bubble sensor, which is arranged in the outlet section and is used to detect whether there are bubbles in the liquid entering the liquid inlet; the water electrolysis hydrogen production system also includes a temperature sensor and a pressure sensor, which are arranged at intervals in the outlet section and are used to respectively detect the temperature and pressure of the liquid entering the liquid inlet; the water electrolysis hydrogen production system also includes a filter pipeline and an ion filter arranged on the filter pipeline, and the ion filter is used to filter ions in the liquid; the filter pipeline is arranged in parallel with at least a part of the middle section, so that the liquid in the main water inlet pipeline can selectively pass through the filter pipeline or the middle section.

[0012] Furthermore, the water electrolysis hydrogen production system also includes a throttle valve, which is arranged on the portion of the middle section connected in parallel with the filter pipeline to switch the portion of the middle section connected in parallel with the filter pipeline.

[0013] Furthermore, the water electrolysis hydrogen production system also includes an output pipeline, one end of which is connected to the liquid outlet on the electrolyzer assembly; the liquid source includes a water tank, the water tank has an output port and a circulation port, the circulation port is connected to the other end of the output pipeline to transport the liquid flowing out of the liquid outlet to the water tank for storage; the output port is connected to the inlet of the main water inlet pipeline and the inlet of the bypass branch; the water electrolysis hydrogen production system also includes a temperature sensor and a pressure sensor, the pressure sensor is arranged on the output pipeline, and is used to detect the pressure of the liquid in the output pipeline; the temperature sensor is arranged on the water tank and / or the output pipeline, and is used to detect the temperature of the liquid; the water electrolysis hydrogen production system also includes a conductivity meter, and the conductivity meter is arranged on the water tank, and is used to measure the conductivity of the liquid in the water tank.

[0014] Furthermore, the water electrolysis hydrogen production system also includes a third valve arranged on the main water inlet pipeline, and the third valve is arranged at the outlet end of the heat exchanger; the water electrolysis hydrogen production system also includes a heat exchange pipeline, a fourth valve and a one-way valve respectively arranged on the heat exchange pipeline, and the fourth valve is used to regulate the circulation of the heat exchange medium in the heat exchange pipeline; the heat exchanger has a medium pipeline for circulating the heat exchange medium inside, and the medium pipeline is connected to the heat exchange pipeline; the heat exchange pipeline is used to exchange heat with the main water inlet pipeline.

[0015] By applying the technical solution of the utility model, the utility model sets a bypass branch in parallel with the heat exchanger, so that the water electrolysis hydrogen production system can perform heat exchange without passing through the heat exchanger when performing low water flow operation and testing, thereby avoiding excessive temperature changes of the water, achieving accurate temperature control, and facilitating the efficient and stable operation of the water electrolysis hydrogen production system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0017] Figure 1 The internal structure schematic diagram of the water electrolysis hydrogen production system provided in the embodiment of the utility model is shown.

[0018] The above drawings include the following reference numerals:

[0019] 1. Liquid source; 2. Electrolyzer assembly; 201. Liquid inlet; 202. Liquid outlet; 3. Heating assembly; 4. Main water inlet pipeline; 41. Inlet section; 42. Middle section; 43. Outlet section; 5. Heat exchanger; 6. Bypass branch; 7. Bubble sensor; 8. Temperature sensor; 9. Pressure sensor; 10. Filter pipeline; 11. Ion filter; 12. Throttle valve; 13. Liquid drive pump; 14. Flow meter; 15. First valve; 16. Output pipeline; 17. Water tank; 171. Output port; 172. Circulation port; 18. Conductivity meter; 19. Second valve; 20. Third valve; 21. Heat exchange pipeline; 22. Fourth valve; 23. One-way valve. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0021] like Figure 1 As shown, an embodiment of the utility model provides a water electrolysis hydrogen production system, comprising: a liquid source 1, for providing liquid required for electrolysis, the liquid comprising water; an electrolyzer assembly 2, for electrolyzing water to produce hydrogen, having a liquid inlet 201; a main water inlet pipeline 4, the outlet of which is connected to the liquid inlet 201, and the inlet of which is connected to the liquid source 1; a heat exchanger 5, arranged on the main water inlet pipeline 4, for exchanging heat with the liquid in the main water inlet pipeline 4 to regulate the liquid temperature; a bypass branch 6, the outlet of which is connected to the liquid inlet 201, and the inlet of the bypass branch 6 is connected to the bypass branch connection point of the main water inlet pipeline 4, so that the bypass branch 6 and the heat exchanger 5 are arranged in parallel; the inlet of the bypass branch 6 is connected to the liquid source 1; a flow meter 14, arranged between the bypass branch connection point and the liquid source 1, for measuring the flow rate of the liquid flowing out of the liquid source 1; and a regulating assembly, for cooperating with the main water inlet pipeline 4 and the bypass branch 6 to regulate the flow direction of the liquid.

[0022] When the water electrolysis hydrogen production system is applied, when the flow rate of the liquid flowing out of the liquid source 1 measured by the flow meter 14 is lower than the set standard, the flow direction of the liquid is adjusted by the regulating component to enter the liquid inlet 201 through the bypass branch 6; when the flow rate of the liquid flowing out of the liquid source 1 measured by the flow meter 14 is not lower than the set standard, the flow direction of the liquid is adjusted by the regulating component to enter the liquid inlet 201 through the main water inlet pipeline 4 and the heat exchanger 5. Therefore, by setting the bypass branch 6 in parallel with the heat exchanger 5, the water electrolysis hydrogen production system can be operated and tested at a low water flow rate without heat exchange through the heat exchanger 5, thereby avoiding excessive temperature changes of the water and achieving accurate temperature control.

[0023] In addition, the water electrolysis hydrogen production system may further include a heating component 3, which is arranged on the electrolyzer component 2 and is used to heat the liquid entering the liquid inlet 201. Therefore, by arranging the heating component 3 to heat the liquid entering the liquid inlet 201, the distance between the heating source and the electrolyzer is effectively shortened, thereby avoiding excessive temperature changes of the water and achieving further accurate temperature control.

[0024] It should be noted that the applicant creatively discovered in actual use and experimental process that in the existing PEM water electrolysis hydrogen production system, deionized water (e.g., pure water) is transmitted by a water pump, heated by a heater, and then directly enters the electrolyzer after adjusting the temperature by a heat exchanger to maintain the required water temperature range, such as 60 to 80°C; the applicant found that the traditional technical solution has the following problems: 1. When the hydrogen production system is heated, the heating source is far away from the electrolyzer, resulting in inevitable heat loss of the heated liquid along the way, causing problems such as slow water heating, long time consumption, and inaccurate temperature control; in addition, when the existing water electrolysis hydrogen production system is operated and tested at a low water flow rate, the amount of water passing through the heat exchanger is small and the total amount of heat exchange is basically unchanged, resulting in excessive changes in water temperature, and then inaccurate temperature control; 2. It is impossible to detect bubbles; when there are bubbles in the pipeline, water and bubbles will enter the electrolyzer together, which will not only reduce the oxygen production efficiency, but also cause irreversible damage to the proton exchange membrane of the electrolyzer.

[0025] In the process of producing hydrogen by electrolysis of water, the proton exchange membrane plays the role of separating the anode and the cathode; when bubbles in the water are generated in the electrolytic cell, they will cause irreversible damage to the proton exchange membrane; the applicant has found out the reasons as follows: first, the bubbles in the water may produce mechanical impact on the surface of the proton exchange membrane, which will cause tiny cracks on the surface of the proton exchange membrane. These cracks will cause the proton exchange membrane to lose its original sealing properties, thereby causing the electron flow between the anode and cathode to mix and reduce the electrolysis efficiency; secondly, the bubbles in the water may produce chemical corrosion on the surface of the proton exchange membrane; if the gas inside the bubbles contains a certain amount of oxygen and other gases, when the bubbles come into contact with the proton exchange membrane, the oxygen in the bubbles will react with the material on the surface of the proton exchange membrane to produce an oxidation reaction, causing damage and corrosion to the surface of the proton exchange membrane; the above damage to the proton exchange membrane is irreversible, so once the proton exchange membrane is damaged by bubbles, it will affect the long-term stable operation of the electrolyzer, and even require the replacement of the proton exchange membrane, increasing production costs and maintenance difficulties; therefore, in the process of electrolysis of water to produce hydrogen, measures need to be taken to reduce the damage of bubbles in the water to the proton exchange membrane.

[0026] In order to solve the above problems, the utility model heats the liquid entering the liquid inlet 201 by setting a heating component 3, which effectively shortens the distance between the heating source and the electrolytic cell, thereby avoiding heat loss along the way of the heated liquid, ensuring the rapid heating of pure water, saving time and accurate temperature control; by setting a bypass branch 6 in parallel with the heat exchanger 5, the electrolysis water hydrogen production system can be operated and tested at a low water flow rate without passing through the heat exchanger 5 for heat exchange, thereby avoiding excessive temperature changes of the water and achieving accurate temperature control; compared with the method in which water is driven by a water pump to pass through a plate heat exchanger for heat exchange and then enter the electrolytic cell, the utility model uses the heating component 3 to achieve secondary heating and rapid temperature control of the water, thereby facilitating the efficient and stable operation of the electrolysis water hydrogen production system; the utility model has a simple structure and reliable operation, can be modified on the existing electrolysis water hydrogen production system, and is suitable for large-scale promotion and use.

[0027] It should be noted that the liquid required by the water electrolysis hydrogen production system is mainly water; specifically, the water electrolysis hydrogen production system requires pure distilled water or deionized water as an electrolyte. This is because during the electrolysis process, water molecules will be decomposed into hydrogen and oxygen. If the water contains impurities or ions, it will affect the effect of electrolysis and the purity of hydrogen production. When the water electrolysis hydrogen production system is working, it is necessary to ensure that the water used is pure and that impurities and ions can be removed by filtering or other methods. In addition, in order to improve the efficiency of electrolysis and reduce energy consumption, a small amount of electrolyte, such as sodium hydroxide or potassium hydroxide, can be added to the water to improve the conductivity of the electrolysis. In general, the liquid required in the water electrolysis hydrogen production system is pure water, and possible electrolytes. The selection and quality of these liquids are crucial to the efficiency of hydrogen production by electrolysis and the purity of hydrogen production. Therefore, the main component of the liquid required for electrolysis provided by the liquid source 1 is pure water, and the liquid composition can be flexibly adjusted according to the needs of electrolysis.

[0028] It is also worth noting that: the setting standard proposed by the present invention is a flow concept, which usually refers to the flow rate of water. In the electrolysis water hydrogen production system, the water flow rate can be distinguished according to the following factors: 1. The size of the electrolyzer assembly 2. Water with a lower flow rate is usually suitable for a smaller electrolyzer assembly 2, while a large flow rate is suitable for a larger electrolyzer electrolyzer assembly 2. The size of the electrolyzer assembly 2 determines its ability to process water, and therefore affects the setting of the setting standard; 2. The electrolysis reaction rate in the electrolyzer assembly 2. The reaction rate of hydrogen production by electrolysis of water usually depends on the current density, and the current density is proportional to the flow rate of water flowing through the electrolyzer. Therefore, when it is needed, If a faster reaction rate is required, a larger flow rate of water will be selected, which also affects the setting of the setting standard; 3. The demand for hydrogen, select the appropriate flow rate according to the demand for hydrogen; if a large amount of hydrogen needs to be produced, it is necessary to select a large flow rate of water supply; 4. Energy consumption and cost considerations, water supplies with different flow rates will consume different energy, and will also affect the operating cost of the system. Therefore, energy consumption and cost need to be considered when selecting the flow rate; in summary, the setting standards proposed in the utility model can be set according to factors such as the size of the electrolytic cell assembly 2, the electrolysis reaction rate, the hydrogen demand and energy consumption, so as to improve applicability.

[0029] Optionally, the regulating component includes a first valve 15 and a second valve 19; the first valve 15 is arranged on the bypass branch 6 to control the liquid flow in the bypass branch 6; the second valve 19 is arranged at the inlet end of the heat exchanger 5; wherein the first valve 15 and the second valve 19 are both manual valves, and the flow direction of the liquid is adjusted by manually adjusting the opening and closing of the first valve 15 and the second valve 19. By setting the manual valve, the simplicity of the regulating component is ensured.

[0030] Optionally, the regulating component includes a controller, a first valve 15 and a second valve 19; the first valve 15 is arranged on the bypass branch 6 to control the liquid flow in the bypass branch 6; the second valve 19 is arranged between the inlet end of the heat exchanger 5 and the bypass branch connection point; wherein the first valve 15 and the second valve 19 are both solenoid valves, and are electrically connected to the controller respectively; the controller regulates the flow direction of the liquid by controlling the opening and closing of the first valve 15 and the second valve 19. By setting the solenoid valve and the controller to work in coordination, structural support is provided for the subsequent intelligent and remote control regulating component.

[0031] It should be noted that: in a specific embodiment of the present utility model, the regulating component can also use an existing three-way switching valve, the three-way valve is set at the bypass branch connection point, the inlet end of the three-way switching valve is connected to the liquid drive pump 13 to be described in detail below, and the outlet end of the three-way switching valve is respectively connected to the bypass branch 6 and the inlet end of the heat exchanger 5, and the flow direction of the liquid is regulated by internal switching. The controller can be a single-chip microcomputer, a personal computer, an industrial computer, etc.

[0032] like Figure 1 As shown, the water electrolysis hydrogen production system also includes a bubble sensor 7, which is arranged on the main water inlet pipeline 4 and / or the bypass branch 6, and is used to detect whether there are bubbles in the liquid in the pipeline. By arranging the bubble sensor 7, the water electrolysis hydrogen production system has the function of detecting bubbles in the liquid in the pipeline, and then when there are bubbles in the pipeline, the bubble sensor 7 will detect and trigger the system alarm emergency stop in time, which can protect the electrolyzer assembly 2 in time and avoid irreversible damage to the proton exchange membrane in the electrolyzer assembly 2.

[0033] In a specific embodiment of the present invention, the water electrolysis hydrogen production system also includes a controller and an alarm. The controller is electrically connected to the alarm and the bubble sensor 7, respectively. When the bubble sensor 7 detects bubbles in the liquid in the pipeline, the controller controls the alarm to send out an alarm message and / or an alarm prompt sound to remind the staff to deal with it in time.

[0034] like Figure 1 As shown, the main water inlet pipeline 4 includes an inlet section 41, a middle section 42 and an outlet section 43 which are connected in sequence. The inlet of the main water inlet pipeline 4 is located on the inlet section 41, and the outlet of the main water inlet pipeline 4 is located on the outlet section 43; wherein the heat exchanger 5 is arranged on the middle section 42; the inlet of the bypass branch 6 is connected to the inlet section 41, and the outlet of the bypass branch 6 is connected to the outlet section 43, so that the bypass branch 6 is arranged in parallel with the middle section 42. Such an arrangement realizes the parallel arrangement of the bypass branch 6 and the middle section 42, thereby ensuring the simplification of the structures of the main water inlet pipeline 4 and the bypass branch 6.

[0035] like Figure 1As shown, the water electrolysis hydrogen production system further includes a bubble sensor 7, which is arranged at the outlet section 43 and is used to detect whether there are bubbles in the liquid entering the liquid inlet 201. By arranging the bubble sensor 7 at the outlet section 43, the liquid entering the liquid inlet 201 can be detected by only one bubble sensor 7, which further saves the number of bubble sensors 7, simplifies the structure and reduces the cost.

[0036] like Figure 1 As shown, the water electrolysis hydrogen production system further includes a temperature sensor 8 and a pressure sensor 9, which are arranged at intervals in the outlet section 43 to respectively detect the temperature and pressure of the liquid entering the liquid inlet 201. By arranging the temperature sensor 8 and the pressure sensor 9, real-time monitoring of the temperature and pressure of the liquid entering the liquid inlet 201 is achieved.

[0037] In a specific embodiment of the present invention, the water electrolysis hydrogen production system also includes a controller and an alarm. The controller is electrically connected to the alarm, temperature sensor 8 and pressure sensor 9 respectively. When the temperature sensor 8 and pressure sensor 9 detect abnormal temperature and pressure of the liquid in the pipeline, the controller controls the alarm to send out an alarm message and / or an alarm prompt sound to remind the staff to deal with it in time.

[0038] like Figure 1 As shown, the water electrolysis hydrogen production system further includes a filter pipeline 10 and an ion filter 11 disposed on the filter pipeline 10, and the ion filter 11 is used to filter ions in the liquid; the filter pipeline 10 is arranged in parallel with at least a portion of the middle section 42, so that the liquid in the main water inlet pipeline 4 can selectively pass through the filter pipeline 10 or the middle section 42. By providing the ion filter 11 and the filter pipeline 10, the water electrolysis hydrogen production system has the function of filtering ions (such as metal ions) in water when necessary, thereby effectively reducing the conductivity of water and improving the hydrogen production efficiency when producing hydrogen by electrolysis of water.

[0039] like Figure 1 As shown, the water electrolysis hydrogen production system further includes a throttle valve 12, which is arranged on the portion where the middle section 42 is connected in parallel with the filter pipeline 10, so as to switch the portion where the middle section 42 is connected in parallel with the filter pipeline 10. By setting the throttle valve 12, effective control of the opening and closing of the portion where the middle section 42 is connected in parallel with the filter pipeline 10 is achieved, thereby achieving the switching of the filtering function and the straight-through function.

[0040] like Figure 1 As shown, the water electrolysis hydrogen production system further includes a liquid driven pump 13, which is disposed on the main water inlet pipeline 4 and / or the bypass branch 6, and is used to drive the liquid in the pipeline to flow.

[0041] In a specific embodiment of the present invention, the water electrolysis hydrogen production system further includes a controller, which is electrically connected to the liquid drive pump 13 and the flow meter 14 respectively to control the operation of the liquid drive pump 13 and monitor the flow in real time.

[0042] In another specific embodiment of the utility model, in order to facilitate procurement and installation, the liquid drive pump 13 adopts a peristaltic pump, the heat exchanger 5 adopts a plate heat exchanger, and the flow meter 14 adopts an ultrasonic water flow meter; when electrolyzing water, a programmable power supply is used to provide electrical energy to the electrolytic cell assembly 2 to ensure the controllability and safety of the water electrolysis process.

[0043] like Figure 1 As shown, the water electrolysis hydrogen production system also includes an output pipeline 16, one end of which is connected to the liquid outlet 202 on the electrolyzer assembly 2; the liquid source 1 includes a water tank 17, the water tank 17 has an output port 171 and a circulation port 172, the circulation port 172 is connected to the other end of the output pipeline 16, so as to transport the liquid flowing out of the liquid outlet 202 to the water tank 17 for storage; the output port 171 is connected to the inlet of the main water inlet pipeline 4 and the inlet of the bypass branch 6; the water electrolysis hydrogen production system also includes a temperature sensor 8 and a pressure sensor 9, the pressure sensor 9 is arranged on the output pipeline 16, and is used to detect the pressure of the liquid in the output pipeline 16; the temperature sensor 8 is arranged on the water tank 17 and / or the output pipeline 16, and is used to detect the temperature of the liquid; the water electrolysis hydrogen production system also includes a conductivity meter 18, and the conductivity meter 18 is arranged on the water tank 17, and is used to measure the conductivity of the liquid in the water tank 17. Such an arrangement not only ensures the working reliability and safety of the water electrolysis hydrogen production system, but also simplifies the structure of the water electrolysis hydrogen production system and reduces the cost.

[0044] In a specific embodiment of the present invention, the water electrolysis hydrogen production system also includes a thermal insulation component (as a structure for first regulating the temperature of the liquid) and a liquid level sensor. The thermal insulation component is arranged on the water tank 17 to regulate the temperature of the liquid in the water tank 17; the liquid level sensor is arranged on the water tank 17 to monitor the liquid level of the liquid in the water tank 17.

[0045] like Figure 1 As shown, the water electrolysis hydrogen production system also includes a third valve 20 arranged on the main water inlet pipeline 4, and the third valve 20 is arranged at the outlet end of the heat exchanger 5; the water electrolysis hydrogen production system also includes a heat exchange pipeline 21, a fourth valve 22 and a one-way valve 23 respectively arranged on the heat exchange pipeline 21, and the fourth valve 22 is used to adjust the circulation of the heat exchange medium in the heat exchange pipeline 21; the heat exchanger 5 has a medium pipeline for circulating the heat exchange medium inside, and the medium pipeline is connected to the heat exchange pipeline 21; the heat exchange pipeline 21 is used to exchange heat with the main water inlet pipeline 4. This arrangement not only ensures the reliable heat exchange of the heat exchanger 5, but also makes the heat exchange process efficient and controllable.

[0046] Now the specific working process and principle of the utility model are described in detail as follows: the water electrolysis hydrogen production system proposed in the utility model is a PEM (proton exchange membrane) water electrolysis hydrogen production system. When the electrolyzer is tested, the liquid source 1 is opened so that there is water in the water tank 17, and the liquid drive pump 13 starts to work to pump the water in the water tank 17 into the flow meter 14. The flow rate is determined according to the flow data detected by the flow meter 14; under low flow, the second valve 19 and the third valve 20 are closed, and the first valve 15 is opened (for example: the first valve 15 adopts a manual valve). At this time, the pipeline transportation state is a low water flow mode, and water flows out from the bypass branch 6, and enters the electrolyzer assembly 2 after being detected by the pressure sensor 9, the temperature sensor 8 and the bubble sensor 7. At this time, the low water volume water does not pass through the heat exchanger 5 for heat exchange, but is heated by the heating component 3, so the temperature rise is faster and the temperature control is more precise; and when the bubble sensor 7 detects that the water is mixed with bubbles, it will immediately alarm and stop urgently to protect the electrolytic cell component 2; in the high water flow mode, at this time, the first valve 15 is closed, the second valve 19 and the third valve 20 are opened, and the throttle valve 12 is adjusted. After the water passes through the plate heat exchanger 5 for heat exchange, it flows into the ion filter 11 for ion removal, and then passes through the pressure sensor 9, the temperature sensor 8 and the bubble sensor 7 in turn, and is heated by the heating component 3 (for example: end plate heating) before entering the electrolytic cell component 2 for hydrogen production; when the bubble sensor 7 detects that the water is mixed with bubbles, it will immediately alarm and stop urgently to protect the electrolytic cell component 2.

[0047] It should be noted that: in a specific embodiment of the present utility model, the water electrolysis hydrogen production system also includes a controller with a display function, and the controller is electrically connected to the flow meter 14, the bubble sensor 7, the temperature sensor 8, and the pressure sensor 9, respectively, to collect relevant data; under the condition that the second valve 19, the third valve 20 and the first valve 15 are all solenoid valves, the controller is electrically connected to the second valve 19, the third valve 20 and the first valve 15 to control the opening and closing of the second valve 19, the third valve 20 and the first valve 15 and the mutual coordination working process; in addition, the second valve 19, the third valve 20 and the first valve 15 can also use manual regulating valves for cost saving considerations. At this time, the staff is required to manually adjust the opening and closing of the second valve 19, the third valve 20 and the first valve 15 and the mutual coordination working process according to the flow data displayed by the controller and or the flow meter 14.

[0048] In summary, the utility model provides a water electrolysis hydrogen production system, which heats the liquid entering the liquid inlet 201 by setting a heating component 3, effectively shortening the distance between the heating source and the electrolytic cell, thereby avoiding heat loss along the way of the heated liquid, ensuring rapid heating of the water, saving time and accurate temperature control; by setting a bypass branch 6 in parallel with the heat exchanger 5, the water electrolysis hydrogen production system can be operated and tested at a low water flow rate without passing through the heat exchanger 5 for heat exchange, thereby avoiding excessive temperature changes of the water and achieving accurate temperature control; compared with the prior art in which water is driven by a water pump to pass through a plate heat exchanger for heat exchange and then enters the electrolytic cell, the utility model uses the heating component 3 to achieve secondary heating and rapid temperature control of the water, thereby facilitating the efficient and stable operation of the water electrolysis hydrogen production system.

[0049] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0050] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0051] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0052] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0053] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0054] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A water electrolysis hydrogen production system, characterized in that: include: A liquid source (1), used to provide liquid required for electrolysis, wherein the liquid comprises water; An electrolyzer assembly (2), used for electrolyzing water to produce hydrogen, having a liquid inlet (201); A main water inlet pipeline (4), the outlet of which is in communication with the liquid inlet (201), and the inlet of which is in communication with the liquid source (1); A heat exchanger (5) is arranged on the main water inlet pipeline (4) and is used to exchange heat with the liquid in the main water inlet pipeline (4) to control the temperature of the liquid; a bypass branch (6), wherein the outlet of the bypass branch (6) is in communication with the liquid inlet (201), and the inlet of the bypass branch (6) is in communication with the bypass branch connection point of the main water inlet pipeline (4), so that the bypass branch (6) is arranged in parallel with the heat exchanger (5); a flow meter (14), arranged between the bypass branch connection point and the liquid source (1), and used for measuring the flow rate of the liquid flowing out of the liquid source (1); The regulating component is used to cooperate with the main water inlet pipeline (4) and the bypass branch (6) to regulate the flow direction of the liquid.

2. The water electrolysis hydrogen production system according to claim 1, characterized in that: When the flow rate of liquid flowing out of the liquid source (1) measured by the flow meter (14) is lower than a set standard, the flow direction of the liquid is adjusted by the regulating component to enter the liquid inlet (201) through the bypass branch (6); when the flow rate of liquid flowing out of the liquid source (1) measured by the flow meter (14) is not lower than the set standard, the flow direction of the liquid is adjusted by the regulating component to enter the liquid inlet (201) through the main water inlet pipeline (4) and the heat exchanger (5).

3. The water electrolysis hydrogen production system according to claim 1 or 2, characterized in that: The regulating assembly comprises a first valve (15) and a second valve (19); the first valve (15) is arranged on the bypass branch (6); the second valve (19) is arranged at the inlet end of the heat exchanger (5); wherein the first valve (15) and the second valve (19) are both manual valves; Alternatively, the regulating component comprises a controller, a first valve (15) and a second valve (19); the first valve (15) is arranged on the bypass branch (6); the second valve (19) is arranged between the inlet end of the heat exchanger (5) and the connection point of the bypass branch; wherein the first valve (15) and the second valve (19) are both solenoid valves and are electrically connected to the controller respectively; the controller regulates the flow direction of the liquid by controlling the opening and closing of the first valve (15) and the second valve (19); Alternatively, the regulating component comprises a three-way valve and the controller, wherein the three-way valve is arranged at the connection point of the bypass branch, the inlet of the three-way valve is connected to the outlet of the flow meter (14), the first outlet of the three-way valve is connected to the main water inlet pipeline (4), and the second outlet of the three-way valve is connected to the bypass branch (6); the controller is electrically connected to the three-way valve and is used to control the on and off of the three-way valve.

4. The water electrolysis hydrogen production system according to claim 1, characterized in that: The water electrolysis hydrogen production system further comprises a heating component (3), wherein the heating component (3) is arranged on the electrolyzer component (2) and is used to heat the liquid entering the liquid inlet (201).

5. The water electrolysis hydrogen production system according to claim 1, characterized in that: The water electrolysis hydrogen production system further comprises a bubble sensor (7), which is arranged on the main water inlet pipeline (4) and the bypass branch (6) and is used to detect whether there are bubbles in the liquid.

6. The water electrolysis hydrogen production system according to claim 1, characterized in that: The main water inlet pipeline (4) comprises an inlet section (41), an intermediate section (42) and an outlet section (43) which are connected in sequence; the inlet of the main water inlet pipeline (4) is located on the inlet section (41), and the outlet of the main water inlet pipeline (4) is located on the outlet section (43); wherein the heat exchanger (5) is arranged on the intermediate section (42); the inlet of the bypass branch (6) is connected to the inlet section (41), and the outlet of the bypass branch (6) is connected to the outlet section (43), so that the bypass branch (6) and the intermediate section (42) are arranged in parallel.

7. The water electrolysis hydrogen production system according to claim 6, characterized in that: The water electrolysis hydrogen production system further comprises a bubble sensor (7), wherein the bubble sensor (7) is arranged at the outlet section (43) and is used to detect whether there are bubbles in the liquid entering the liquid inlet (201); The water electrolysis hydrogen production system further comprises a temperature sensor (8) and a pressure sensor (9), wherein the temperature sensor (8) and the pressure sensor (9) are arranged at intervals in the outlet section (43) and are used to respectively detect the temperature and pressure of the liquid entering the liquid inlet (201); The water electrolysis hydrogen production system further comprises a filtering pipeline (10) and an ion filter (11) arranged on the filtering pipeline (10), wherein the ion filter (11) is used to filter ions in a liquid; the filtering pipeline (10) is arranged in parallel with at least a portion of the middle section (42), so that the liquid in the main water inlet pipeline (4) can selectively pass through the filtering pipeline (10) or the middle section (42).

8. The water electrolysis hydrogen production system according to claim 7, characterized in that: The water electrolysis hydrogen production system also includes a throttle valve (12), which is arranged on the portion of the middle section (42) connected in parallel with the filter pipeline (10) to switch the portion of the middle section (42) connected in parallel with the filter pipeline (10).

9. The water electrolysis hydrogen production system according to claim 1, characterized in that: The water electrolysis hydrogen production system further comprises an output pipeline (16), one end of which is in communication with a liquid outlet (202) on the electrolyzer assembly (2); the liquid source (1) comprises a water tank (17), the water tank (17) having an output port (171) and a circulation port (172), the circulation port (172) being in communication with the other end of the output pipeline (16) so as to transport the liquid flowing out of the liquid outlet (202) to the water tank (17) for storage; the output port (171) is in communication with an inlet of the main water inlet pipeline (4) and an inlet of the bypass branch (6); The water electrolysis hydrogen production system further comprises a temperature sensor (8) and a pressure sensor (9); the pressure sensor (9) is arranged on the output pipeline (16) and is used to detect the pressure of the liquid in the output pipeline (16); the temperature sensor (8) is arranged on the water tank (17) and / or the output pipeline (16) and is used to detect the temperature of the liquid; The water electrolysis hydrogen production system further comprises a conductivity meter (18), which is arranged on the water tank (17) and is used to measure the conductivity of the liquid in the water tank (17).

10. The water electrolysis hydrogen production system according to claim 1, characterized in that: The water electrolysis hydrogen production system further comprises a third valve (20) arranged on the main water inlet pipeline (4), and the third valve (20) is arranged at the outlet end of the heat exchanger (5); The water electrolysis hydrogen production system further comprises a heat exchange pipeline (21), a fourth valve (22) and a one-way valve (23) respectively arranged on the heat exchange pipeline (21), wherein the fourth valve (22) is used to regulate the circulation of a heat exchange medium in the heat exchange pipeline (21); the heat exchanger (5) has a medium pipeline inside for circulating a heat exchange medium, and the medium pipeline is connected to the heat exchange pipeline (21); and the heat exchange pipeline (21) is used to exchange heat with the main water inlet pipeline (4).

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