Water electrolysis hydrogen production system

Abstract

The utility model discloses a water electrolysis hydrogen production system, and relates to the technical field of hydrogen production, the water electrolysis hydrogen production system comprises an electrolytic bath and a gas-liquid separator, an electrolysis product flow path is formed between the electrolytic bath and the gas-liquid separator, and the electrolytic bath and the gas-liquid separator are sequentially distributed in the direction from the upstream to the downstream of the electrolysis product flow path; the water electrolysis hydrogen production system further comprises a cooling flow path, the liquid inlet end of the cooling flow path communicates with the gas-liquid separator, and the liquid outlet end of the cooling flow path is connected into the electrolysis product flow path. According to the technical scheme, the alkali liquor in the gas-liquid separator is cooled on the cooling flow path and then introduced into the electrolysis product flow path again, and the cooled low-temperature alkali liquor is mixed with a high-temperature gas-liquid mixture coming out of the electrolysis bath and then enters the gas-liquid separator at a low temperature; therefore, the temperature of materials in the gas-liquid separator is reduced, the separation of a gas-liquid mixture is facilitated, the efficiency of downstream washing and other operations is improved, and the purity of gas is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydrogen production systems, in particular to a water electrolysis hydrogen production system. BACKGROUND

[0002] In the existing water electrolysis hydrogen production system, the gas-liquid mixture generated by the anode and cathode outlets of the electrolytic cell usually directly flows into the gas-liquid separator. However, this design will cause the temperature in the downstream processing process to be too high, and the alkali liquor in the gas-liquid mixture is not easy to be effectively removed, thereby affecting the separation and washing effect and being not conducive to improving the purity of the gas. CONTENT OF THE UTILITY MODEL

[0003] The main purpose of the present application is to provide a water electrolysis hydrogen production system, which aims to reduce the temperature of the gas-liquid mixture entering the gas-liquid separator.

[0004] To achieve the above-mentioned purpose, the water electrolysis hydrogen production system provided by the present application comprises an electrolysis product flow path, the electrolysis product flow path comprises an electrolytic cell and a gas-liquid separator, an electrolysis product flow path is formed between the electrolytic cell and the gas-liquid separator, and the electrolytic cell and the gas-liquid separator are distributed in sequence in the upstream-to-downstream direction of the electrolysis product flow path.

[0005] The water electrolysis hydrogen production system further comprises a cooling flow path, the liquid inlet end of the cooling flow path is in communication with the gas-liquid separator, and the liquid outlet end of the cooling flow path is connected to the electrolysis product flow path.

[0006] In an embodiment, the water electrolysis hydrogen production system further comprises a mixer, the mixer is arranged on the electrolysis product flow path, and the liquid outlet end of the cooling flow path is connected to the mixer.

[0007] In an embodiment, the liquid inlet end of the cooling flow path is connected to the gas-liquid separator, and a first booster pump and a first heat exchanger are arranged on the cooling flow path.

[0008] In an embodiment, the electrolytic cell has a liquid return port, the water electrolysis hydrogen production system further comprises a liquid return flow path, the liquid inlet end of the liquid return flow path is connected to the gas-liquid separator, the liquid outlet end of the liquid return flow path is connected to the liquid return port, a second booster pump and a second heat exchanger are arranged on the liquid return flow path, and the liquid inlet end of the cooling flow path is connected to the liquid return flow path between the second booster pump and the liquid return port.

[0009] In an embodiment, the second heat exchanger is arranged upstream of the second booster pump.

[0010] In an embodiment, a first heat exchanger is arranged on the cooling flow path.

[0011] In an embodiment, the water electrolysis hydrogen production system further comprises a flow meter and a flow regulating valve, the flow meter is arranged on the liquid return flow path, the liquid inlet end of the cooling flow path is located between the second booster pump and the flow regulating valve, and the flow regulating valve is electrically connected with the flow meter.

[0012] In an embodiment, the flow regulating valve is arranged on the cooling flow path and upstream of the first heat exchanger.

[0013] In an embodiment, the water electrolysis hydrogen production system further comprises a temperature sensor and a temperature regulating valve, the temperature sensor is arranged on the electrolysis product flow path and between the gas-liquid separator and the mixer, and the temperature regulating valve is used for regulating the flow of the cooling liquid of the first heat exchanger and is electrically connected with the temperature sensor.

[0014] In an embodiment, the water electrolysis hydrogen production system comprises a plurality of electrolysis cells, the gas-liquid separator comprises a hydrogen side gas-liquid separator and an oxygen side gas-liquid separator, and the plurality of electrolysis cells share the same hydrogen side gas-liquid separator and the same oxygen side gas-liquid separator.

[0015] The technical scheme of the present application uses the alkali solution in the gas-liquid separator, which is introduced into the electrolysis product flow path after being cooled in the cooling flow path, and the low-temperature alkali solution after cooling is mixed with the high-temperature gas-liquid mixture from the electrolysis cell and then enters the gas-liquid separator at a lower temperature, thereby reducing the temperature of the materials inside the gas-liquid separator, enabling the alkali solution in the gas-liquid mixture to be effectively removed, thereby facilitating the separation of the gas-liquid mixture and the efficiency of downstream washing and other operations, and further facilitating the improvement of the purity of the gas. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor based on the structures shown in the drawings.

[0017] Figure 1 The structural schematic diagram of an embodiment of the water electrolysis hydrogen production system provided by the present application is shown in the figure.

[0018] Figure 2 The structural schematic diagram of another embodiment of the water electrolysis hydrogen production system provided by the present application is shown in the figure.

[0019] Figure 3 The structural schematic diagram of still another embodiment of the water electrolysis hydrogen production system provided by the present application is shown in the figure.

[0020] Figure 4Structure diagram of still another embodiment of the water electrolysis hydrogen production system provided in the present application;

[0021] Figure 5 Structure diagram of still another embodiment of the water electrolysis hydrogen production system provided in the present application;

[0022] Figure 6 Structure diagram of still another embodiment of the water electrolysis hydrogen production system provided in the present application;

[0023] Figure 7 Structure diagram of still another embodiment of the water electrolysis hydrogen production system provided in the present application.

[0024] Brief Description of the Drawings:

[0025] 10, water electrolysis hydrogen production system; 100, electrolytic cell; 200, gas-liquid separator; 300, mixer; 410, first booster pump; 420, second booster pump; 510, first heat exchanger; 520, second heat exchanger; 610, flow meter; 620, temperature sensor; 710, flow regulating valve; 720, temperature regulating valve; 810, inlet end of cooling flow path; 820, outlet end of cooling flow path; 910, inlet end of liquid return flow path; 920, outlet end of liquid return flow path.

[0026] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without any creative work fall within the scope of protection of the present application.

[0028] It should be noted that if the present application involves directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship, movement condition, etc. between the components in a certain posture, and if the certain posture changes, the directional indications will also change accordingly.

[0029] In addition, if the description of "first", "second" and the like is involved in the embodiments of the present application, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one of the features. In addition, if "and / or" or "and / or" appears throughout the text, it means that the three parallel schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the present application.

[0030] The present application provides a water electrolysis hydrogen production system 10.

[0031] Please refer to Figure 1 and Figure 5 In an embodiment of the present application, the water electrolysis hydrogen production system 10 includes an electrolysis product flow path, the electrolysis product flow path includes an electrolysis cell 100 and a gas-liquid separator 200, and the electrolysis product flow path is formed between the electrolysis cell 100 and the gas-liquid separator 200. The electrolysis cell 100 and the gas-liquid separator 200 are distributed in the upstream to downstream direction of the electrolysis product flow path. The water electrolysis hydrogen production system 10 further includes a cooling flow path, the inlet end 810 of the cooling flow path is communicated with the gas-liquid separator 200, and the outlet end 820 of the cooling flow path is connected to the electrolysis product flow path.

[0032] Specifically, the electrolysis cell 100 of the water electrolysis hydrogen production system 10 can decompose water into hydrogen and oxygen. The gas generated on the electrode surface of the electrolysis cell 100 will carry a small amount of alkali liquor. The electrolysis product from the electrolysis product outlet of the electrolysis cell 100 is a gas-liquid mixture. The gas-liquid mixture passes through the flow path for gas-liquid separation, washing and cooling, heat exchange, gas-water separation and the like between the electrolysis product outlet of the electrolysis cell 100 and the gas outlet of the water electrolysis hydrogen production system 10 in sequence, which is the electrolysis product flow path of the water electrolysis hydrogen production system 10. The gas-liquid separator 200 is communicated with the electrolysis cell 100, and is used to preliminarily separate the alkali liquor in the gas-liquid mixture. After the preliminary separation of the gas-liquid mixture in the gas-liquid separator 200, the liquid phase remains in the gas-liquid separator 200.

[0033] The liquid inlet end 810 of the cooling flow path is in communication with the gas-liquid separator 200 and receives the lye separated from the gas-liquid separator 200. The lye is cooled in the cooling flow path and then flows from the liquid outlet end 820 of the cooling flow path into the electrolysis product flow path between the electrolysis tank 100 and the gas-liquid separator 200 at a lower temperature, and is mixed with the high-temperature gas-liquid mixture from the electrolysis product outlet of the electrolysis tank 100 (the low temperature and high temperature in the low-temperature lye and high-temperature gas-liquid mixture are relative concepts, that is, the temperature of the lye in the cooling flow path is lower than the temperature of the gas-liquid mixture from the electrolysis tank 100), so as to reduce the temperature of the gas-liquid mixture from the electrolysis product outlet of the electrolysis tank 100, so that the mixed lye and gas-liquid mixture enter the gas-liquid separator 200 at a lower temperature, thereby reducing the temperature of the materials inside the gas-liquid separator 200. The lower temperature helps to reduce the evaporation of water in the gas-liquid mixture, thereby improving the separation accuracy of the gas-liquid separator 200 for gas and lye, so that the lye in the gas-liquid mixture can be effectively removed, thereby facilitating the separation of the gas-liquid mixture and the efficiency of the downstream washing operation, and further facilitating the improvement of the purity of the gas.

[0034] It is worth mentioning that the technical solution of the present application utilizes the lye in the gas-liquid separator 200, cools the lye in the cooling flow path, and then cools the high-temperature gas-liquid mixture from the electrolysis product outlet by the low-temperature lye, instead of directly cooling the gas-liquid mixture by a cooler arranged between the gas-liquid separator 200 and the electrolysis tank 100, thereby avoiding the problem of poor heat exchange efficiency caused by the gas-liquid two-phase of the gas-liquid mixture, and avoiding the problem of shortening the service life of the heat exchanger.

[0035] In addition, the lye separated by the gas-liquid separator 200 is reintroduced into the electrolysis product flow path through the cooling flow path, which on the one hand avoids the waste of lye in the gas-liquid separator 200, and on the other hand significantly reduces the consumption of water or electrolyte, and the water electrolysis hydrogen production system 10 does not need to introduce additional lye, thereby reducing the operating cost.

[0036] The technical solution of the present application utilizes the lye in the gas-liquid separator 200, cools the lye in the cooling flow path, and then cools the high-temperature gas-liquid mixture from the electrolysis product outlet by the low-temperature lye, instead of directly cooling the gas-liquid mixture by a cooler arranged between the gas-liquid separator 200 and the electrolysis tank 100, thereby avoiding the problem of poor heat exchange efficiency caused by the gas-liquid two-phase of the gas-liquid mixture, and avoiding the problem of shortening the service life of the heat exchanger.

[0037] In an embodiment, please refer to Figure 2 and Figure 5The water electrolysis hydrogen production system 10 further comprises a mixer 300 arranged on the electrolysis product flow path, and the outlet end 820 of the cooling flow path is connected to the mixer 300.

[0038] The mixer 300 is arranged between the electrolytic cell 100 and the gas-liquid separator 200, and the outlet end 820 of the cooling flow path is directly connected to the mixer 300, so as to ensure that the cooled low-temperature alkali solution can be uniformly mixed with the high-temperature gas-liquid mixture from the electrolytic cell 100, avoiding local overheating or supercooling caused by temperature fluctuations, which helps to prolong the service life of the equipment and reduce the risk of failure.

[0039] The mixer 300 can be a static mixer, a jet mixer or a stirring mixer, etc. The mixing element of the static mixer is usually spiral, corrugated or other special geometric shapes. When the fluid passes through the mixing element, the fluid is mixed efficiently due to the change of flow channel and shearing effect. The jet mixer uses the high-speed jet of the cooled low-temperature alkali solution through the nozzle to drive the high-temperature gas-liquid mixture to move together, so as to realize mixing. The stirring mixer contains one or more rotating blades, which fully mix the fluid by mechanical stirring.

[0040] In other embodiments, the mixer 300 can not be provided, and the alkali solution in the cooling flow path directly flows into the pipeline of the electrolysis product flow path between the electrolytic cell 100 and the gas-liquid separator 200, so as to reduce the complexity and cost of the equipment. Further, diffusion structure can be used in the pipeline to make the alkali solution and the gas-liquid mixture diffuse and mix naturally in the pipeline. The diffusion structure is designed in the form of a gradually expanding shape or a perforated plate; or a perforated plate or screen is installed in the pipeline to force the alkali solution to pass through small holes or mesh, so as to realize turbulent mixing.

[0041] In an embodiment, please refer to Figure 1 , Figure 2 and Figure 5 The inlet end 810 of the cooling flow path is connected to the gas-liquid separator 200, and the first booster pump 410 and the first heat exchanger 510 are arranged on the cooling flow path.

[0042] The inlet end 810 of the cooling flow path is directly connected to the gas-liquid separator 200 to receive the lye separated from the gas-liquid separator 200. The lye needs to pass through the pipeline in the cooling flow path and the first heat exchanger 510, so there is a certain pressure loss of the lye. The first booster pump 410 is installed on the cooling flow path to increase the pressure of the lye, so as to ensure that the lye in the cooling flow path can flow at a stable flow rate and pressure, avoid the interruption of the lye flow due to insufficient pressure, and thus avoid the problem of uneven mixing of the lye and the gas-liquid mixture. The first heat exchanger 510 is used to cool the high-temperature lye delivered from the gas-liquid separator 200, and the cooled lye is mixed with the high-temperature gas-liquid mixture and then enters the gas-liquid separator 200, thereby reducing the inlet temperature of the gas-liquid separator 200 and improving the efficiency of gas-liquid separation. By arranging the first booster pump 410 and the first heat exchanger 510 on the cooling flow path, the lye in the cooling flow path can flow into the electrolysis product flow path at a stable pressure and temperature, which helps to protect the equipment from thermal stress and mechanical stress, thereby facilitating the stable operation of the entire water electrolysis hydrogen production system 10 and reducing the risk of equipment failure.

[0043] In another embodiment, referring to Figure 3 and Figure 6 , the electrolytic cell 100 has a lye return port, and the water electrolysis hydrogen production system 10 further includes a lye return flow path. The inlet end 910 of the lye return flow path is connected to the gas-liquid separator 200, and the outlet end 920 of the lye return flow path is connected to the lye return port. The second booster pump 420 and the second heat exchanger 520 are arranged on the lye return flow path, and the inlet end 810 of the cooling flow path is connected to the lye return flow path between the second booster pump 420 and the lye return port.

[0044] The electrolytic cell 100 is provided with a lye return port for re-introducing the treated lye into the electrolytic cell 100 to participate in the electrolysis reaction. The inlet end 910 of the lye return flow path is connected to the gas-liquid separator 200 to receive the lye separated from the gas-liquid separator 200, and the outlet end 920 of the lye return flow path is connected to the lye return port of the electrolytic cell 100, so that the treated lye can re-enter the electrolytic cell 100 for recycling. The second booster pump 420 is used to increase the pressure of the lye to ensure that the lye can overcome the resistance of the pipeline in the lye return flow path and the resistance of the second heat exchanger 520 and smoothly flow into the electrolytic cell 100. The second heat exchanger 520 is used to cool the high-temperature lye delivered from the gas-liquid separator 200, thereby reducing the temperature of the lye entering the electrolytic cell 100 and helping to maintain the working temperature of the electrolytic cell 100 within an appropriate range.

[0045] The liquid inlet end 810 of the cooling flow path is connected to the liquid return flow path between the second booster pump 420 and the liquid return port, and the part of the pressurized lye in the liquid return flow path returns to the electrolytic tank 100 and the part of the pressurized lye flows into the electrolytic product flow path through the cooling flow path. The second booster pump 420 not only ensures that the lye in the liquid return flow path can flow into the electrolytic tank 100 at a stable flow rate and pressure, but also ensures that the lye in the cooling flow path can flow into the electrolytic product flow path at a stable flow rate and pressure, thereby avoiding the problem of uneven mixing of the cooled lye in the electrolytic product flow path with the gas-liquid mixture due to the interruption of the flow of the lye in the cooling flow path caused by insufficient pressure. The cooling flow path is connected to the liquid return flow path between the second booster pump 420 and the liquid return port, and the pressurizing effect of the second booster pump 420 is utilized, so that the first booster pump 410 does not need to be additionally arranged on the cooling flow path, thereby reducing the number of booster pumps, simplifying the equipment structure, and reducing the production cost.

[0046] Of course, in other embodiments, the first booster pump 410 can also be arranged on the cooling flow path to further ensure that the lye can flow in the cooling flow path at a stable flow rate and pressure.

[0047] In an embodiment, please refer to Figure 3 , Figure 4 and Figure 6 , the second heat exchanger 520 is arranged upstream of the second booster pump 420.

[0048] The second booster pump 420 and the second heat exchanger 520 are located upstream of the junction of the liquid inlet end 810 of the cooling flow path and the liquid return flow path, and the second heat exchanger 520 is located upstream of the second booster pump 420. The high-temperature lye delivered from the gas-liquid separator 200 is first cooled by the second heat exchanger 520, and then the pressure is increased by the second booster pump 420, and finally enters the electrolytic tank 100. The design sequence of cooling first and then boosting ensures that the lye has a lower temperature when it enters the second booster pump 420, effectively protecting the second booster pump 420 and prolonging its service life. After the temperature of the lye decreases, its volume expansion effect decreases and its flowability is better, which helps the second booster pump 420 to complete the lye delivery task more efficiently and further improves the working efficiency of the second booster pump 420.

[0049] The second heat exchanger 520 is arranged upstream of the second booster pump 420, and the inlet end 810 of the cooling flow path is connected to the liquid return flow path between the second booster pump 420 and the liquid return port, which means that the lye entering the cooling flow path is low-temperature lye, and the first heat exchanger 510 can be omitted on the cooling flow path, or the low-temperature lye in the liquid return flow path can be used to cool and mix the gas-liquid mixture, thereby reducing the number of heat exchangers, simplifying the equipment structure, and reducing the production cost. Of course, the first heat exchanger 510 can also be arranged on the cooling flow path, and the first heat exchanger 510 can be used to cool the low-temperature lye in the liquid return flow path for the second time, so that the lye enters the electrolysis product flow path at a lower temperature, thereby further reducing the temperature of the material in the gas-liquid separator 200, and further improving the separation efficiency of the gas-liquid mixture and the purity of the gas. Moreover, the second heat exchanger 520 and the first heat exchanger 510 together realize heat recovery of the high-temperature lye, thereby reducing the energy consumption of the cooling system.

[0050] In other embodiments, the second heat exchanger 520 is arranged downstream of the second booster pump 420, and the second booster pump 420 and the second heat exchanger 520 are arranged upstream of the intersection of the inlet end 810 of the cooling flow path and the liquid return flow path. The lye in the liquid return flow path is first pressurized and then cooled, and then flows into the cooling flow path as low-temperature lye.

[0051] Alternatively, the second heat exchanger 520 is arranged downstream of the intersection of the inlet end 810 of the cooling flow path and the liquid return flow path. The lye in the liquid return flow path is first pressurized and then cooled, but the lye flowing into the cooling flow path is not cooled and is high-temperature lye, and the first heat exchanger 510 is arranged on the cooling flow path to cool the lye.

[0052] In an embodiment, please refer to Figure 4 and Figure 6 The first heat exchanger 510 is arranged on the cooling flow path.

[0053] The first heat exchanger 510 is used to cool the lye delivered from the liquid return flow path, and the cooled lye is mixed with the high-temperature gas-liquid mixture and then enters the gas-liquid separator 200, thereby reducing the inlet temperature of the gas-liquid separator 200 and improving the separation efficiency. By using the second booster pump 420 on the liquid return flow path and arranging the first heat exchanger 510 on the cooling flow path, the lye in the cooling flow path can flow into the electrolysis product flow path at a stable pressure and temperature, which helps to protect the equipment from thermal stress and mechanical stress, thereby facilitating the stable operation of the entire water electrolysis hydrogen production system 10 and reducing the risk of equipment failure.

[0054] In an embodiment, please refer to Figure 6The water electrolysis hydrogen production system 10 further comprises a flow meter 610 and a flow regulating valve 710. The flow meter 610 is arranged on the liquid return flow path. The liquid inlet end 810 of the cooling flow path is located between the second booster pump 420 and the flow regulating valve 710. The flow regulating valve 710 is electrically connected with the flow meter 610.

[0055] The flow meter 610 is arranged on the liquid return flow path to monitor the flow rate of the alkali solution transported from the gas-liquid separator 200 to the liquid return port of the electrolytic cell 100 in real time. The liquid inlet end 810 of the cooling flow path is located between the second booster pump 420 and the flow regulating valve 710. The flow regulating valve 710 can be arranged on the cooling flow path or the liquid return flow path to regulate the flow rate of the alkali solution diverted from the liquid return flow path to the cooling flow path. The flow regulating valve 710 is electrically connected with the flow meter 610. The flow regulating valve 710 dynamically adjusts the opening degree according to the data provided by the flow meter 610 to flexibly adjust the flow rate ratio in the cooling flow path, so as to ensure that the working state of the cooling flow path and the liquid return flow path is always in the optimal range, thereby maintaining the flow balance of the entire water electrolysis hydrogen production system 10. At the same time, the situation that the flow rate of the alkali solution in the cooling flow path is too large to cause the pipe pressure to be too high or the flow rate is too small to affect the cooling effect is avoided. Through the cooperation of the flow meter 610 and the flow regulating valve 710, the equipment can be effectively protected from adverse working conditions.

[0056] In an embodiment, please refer to Figure 6 The flow regulating valve 710 is arranged on the cooling flow path and upstream of the first heat exchanger 510.

[0057] The flow regulating valve 710 is arranged on the cooling flow path and upstream of the first heat exchanger 510. The alkali solution diverted from the liquid return flow path first passes through the flow regulating valve 710 for flow control, and then enters the first heat exchanger 510 for cooling treatment. This design sequence of flow control first and cooling later ensures that the liquid flow rate entering the first heat exchanger 510 is stable and controllable, and ensures that the fluid flow state in the first heat exchanger 510 is always in the optimal range. Stable flow distribution helps to improve the heat exchange efficiency of the first heat exchanger 510 and avoid the problem of insufficient heat exchange due to excessive or insufficient flow rate.

[0058] In other embodiments, the flow regulating valve 710 can also be arranged on the liquid return flow path and upstream of the flow meter 610 to avoid the situation that the flow rate of the alkali solution in the liquid return flow path is too large to damage the flow meter 610 or the flow rate is too small to cause the flow meter 610 to be inaccurate.

[0059] In an embodiment, please refer to Figure 5 and Figure 6The water electrolysis hydrogen production system 10 further comprises a temperature sensor 620 and a temperature regulating valve 720. The temperature sensor 620 is arranged on the electrolysis product flow path and between the gas-liquid separator 200 and the mixer 300. The temperature regulating valve 720 is used to adjust the flow rate of the cooling liquid in the first heat exchanger 510 and is electrically connected to the temperature sensor 620.

[0060] The temperature sensor 620 is arranged on the electrolysis product flow path and between the gas-liquid separator 200 and the mixer 300, and is used to monitor the temperature of the low-temperature gas-liquid mixture after the low-temperature caustic lye is mixed with the high-temperature gas-liquid mixture. The temperature regulating valve 720 dynamically adjusts the flow rate of the cooling liquid in the first heat exchanger 510 according to the data provided by the temperature sensor 620, adjusts the heat exchange capacity of the first heat exchanger 510 by changing the flow rate of the cooling liquid, and thus accurately adjusts the temperature of the caustic lye in the cooling flow path. The temperature regulating valve 720 can accurately control the flow rate of the cooling liquid according to actual needs, avoiding unnecessary consumption of the cooling liquid and thus reducing the energy consumption of the cooling system. Through the cooperative work of the temperature sensor 620 and the temperature regulating valve 720, the temperature of the gas-liquid mixture entering the gas-liquid separator 200 can be kept within an appropriate range, which helps to improve the separation efficiency of the gas-liquid separator 200 for gas and caustic lye.

[0061] In an embodiment, referring to Figure 7 The water electrolysis hydrogen production system 10 comprises a plurality of electrolytic cells 100, and the gas-liquid separator 200 comprises a hydrogen-side gas-liquid separator and an oxygen-side gas-liquid separator. The plurality of electrolytic cells 100 share the same hydrogen-side gas-liquid separator and the same oxygen-side gas-liquid separator.

[0062] The plurality of electrolytic cells 100 operate simultaneously, each generating hydrogen and oxygen, and delivering the hydrogen-caustic lye gas-liquid mixture to the hydrogen-side gas-liquid separator through the respective hydrogen-side electrolysis product outlet and delivering the oxygen-caustic lye gas-liquid mixture to the oxygen-side gas-liquid separator through the respective oxygen-side electrolysis product outlet. The plurality of electrolytic cells 100 share the same hydrogen-side gas-liquid separator and the same oxygen-side gas-liquid separator, which reduces the number of gas-liquid separators 200 required and improves the utilization rate of the equipment, thereby reducing the manufacturing cost. By increasing the number of electrolytic cells 100 and appropriately adjusting the capacity of the gas-liquid separator 200, it is easy to expand to a configuration of more electrolytic cells 100, which can meet the demand for larger-scale hydrogen production.

[0063] The hydrogen-side gas-liquid mixtures of the plurality of electrolytic cells 100 can be combined together before flowing into the hydrogen-side mixer, realizing the sharing of the hydrogen-side mixer. The hydrogen-side gas-liquid mixtures of the plurality of electrolytic cells 100 can also flow into the respective corresponding hydrogen-side mixers, be cooled first and then flow into the same hydrogen-side gas-liquid separator. The oxygen-side gas-liquid mixtures of the plurality of electrolytic cells 100 are the same, and will not be described here.

[0064] The above merely describes exemplary embodiments of the present application, and is not intended to limit the patent scope of the present application. Any equivalent structural transformation, direct / indirect application in other related technical fields, or the like, made based on the technical concept of the present application, using the content of the present application specification and drawings, is included in the patent protection scope of the present application.

Claims

1. A hydrogen production system by water electrolysis, characterized by, The water electrolysis hydrogen production system (10) comprises an electrolytic tank (100) and a gas-liquid separator (200), an electrolysis product flow path is formed between the electrolytic tank (100) and the gas-liquid separator (200), and the electrolytic tank (100) and the gas-liquid separator (200) are sequentially distributed in the upstream-to-downstream direction of the electrolysis product flow path. The water electrolysis hydrogen production system (10) further comprises a cooling flow path, a liquid inlet end (810) of the cooling flow path is communicated with the gas-liquid separator (200), and a liquid outlet end (820) of the cooling flow path is connected to the electrolysis product flow path.

2. The water electrolysis hydrogen generation system of claim 1, wherein, The water electrolysis hydrogen production system (10) further comprises a mixer (300), the mixer (300) is arranged on the electrolysis product flow path, and the liquid outlet end (820) of the cooling flow path is connected to the mixer (300).

3. The water electrolysis hydrogen generation system of claim 2, wherein, The liquid inlet end (810) of the cooling flow path is connected to the gas-liquid separator (200), and a first booster pump (410) and a first heat exchanger (510) are arranged on the cooling flow path.

4. The water electrolysis hydrogen generation system of claim 2, wherein, The electrolytic tank (100) has a liquid return port, the water electrolysis hydrogen production system (10) further comprises a liquid return flow path, a liquid inlet end (910) of the liquid return flow path is connected to the gas-liquid separator (200), a liquid outlet end (920) of the liquid return flow path is connected to the liquid return port, a second booster pump (420) and a second heat exchanger (520) are arranged on the liquid return flow path, and the liquid inlet end (810) of the cooling flow path is connected to the liquid return flow path between the second booster pump (420) and the liquid return port.

5. The water electrolysis hydrogen generation system of claim 4, wherein, The second heat exchanger (520) is arranged upstream of the second booster pump (420).

6. The water electrolysis hydrogen generation system of claim 4, wherein, The first heat exchanger (510) is arranged on the cooling flow path.

7. The water electrolysis hydrogen generation system of claim 6, wherein, The water electrolysis hydrogen production system (10) further comprises a flow meter (610) and a flow regulating valve (710), the flow meter (610) is arranged on the liquid return flow path, the liquid inlet end (810) of the cooling flow path is located between the second booster pump (420) and the flow regulating valve (710), and the flow regulating valve (710) is electrically connected with the flow meter (610).

8. The water electrolysis hydrogen generation system of claim 7, wherein, The flow regulating valve (710) is arranged on the cooling flow path and upstream of the first heat exchanger (510).

9. The water electrolysis hydrogen generation system of any one of claims 3, 6 to 8, wherein, The water electrolysis hydrogen production system (10) further comprises a temperature sensor (620) and a temperature regulating valve (720), the temperature sensor (620) is arranged on the electrolysis product flow path and between the gas-liquid separator (200) and the mixer (300), the temperature regulating valve (720) is used for regulating the flow of cooling liquid of the first heat exchanger (510) and is electrically connected with the temperature sensor (620).

10. The water electrolysis hydrogen generation system of any one of claims 1 to 8, wherein, The water electrolysis hydrogen production system (10) comprises a plurality of electrolytic tanks (100), the gas-liquid separator (200) comprises a hydrogen-side gas-liquid separator (200) and an oxygen-side gas-liquid separator (200), and the plurality of electrolytic tanks (100) share the same hydrogen-side gas-liquid separator (200) and the same oxygen-side gas-liquid separator (200).

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