Hydrogen production system

Abstract

The utility model discloses a hydrogen production system, and relates to the technical field of hydrogen production. The hydrogen production system comprises an electrolytic bath, a gas-liquid separator, a first heat exchanger, a second circulating pump and a power supply system; the electrolytic bath is provided with a mixture outlet, a circulating liquid outlet and a circulating liquid inlet; the gas-liquid separator is provided with a mixture inlet and an electrolyte outlet; the mixture outlet, the mixture inlet, the electrolyte outlet and the circulating liquid inlet are sequentially connected to form a first circulating loop, and a first control valve is arranged on the first circulating loop; the first heat exchanger is arranged on the first circulation loop and provided with a first electrolyte flow path and a first cooling liquid flow path which are isolated from each other, and the first electrolyte flow path communicates with the electrolyte outlet and the circulation liquid inlet; the circulating liquid outlet, the second circulating pump and the circulating liquid inlet are sequentially connected to form a second circulating loop, and a second control valve is arranged on the second circulating loop; and the electrolyte in the second circulation loop can exchange heat with heat generated by the power supply system. The response speed of the electrolytic cell is increased.

Description

Technical Field

[0001] The present application relates to the technical field of hydrogen production, and particularly relates to a hydrogen production system. Background Art

[0002] With the development of the large-scale hydrogen production system, it has become a trend that multiple electrolyzers share a set of gas-liquid separation systems. In the scenario of hydrogen production with renewable energy fluctuations, when the power generation is low, it can only meet the simultaneous operation of one or a small number of electrolyzers in the system. When the power generation increases, the number of electrolyzers put into use will increase, and the cold start time of each of them cannot quickly respond to the volatility of renewable energy power generation. Summary of the Utility Model

[0003] The main object of the present application is to propose a hydrogen production system, aiming to improve the response speed of electrolyzers in the scenario of hydrogen production with renewable energy fluctuations.

[0004] To achieve the above object, the hydrogen production system proposed in the present application includes an electrolyzer, a gas-liquid separator, a first heat exchanger, a first circulation pump, a second circulation pump, and a power supply system. The electrolyzer has a mixture outlet, a circulating liquid outlet, and a circulating liquid inlet; the gas-liquid separator has a mixture inlet and an electrolyte outlet; the mixture outlet, the mixture inlet, the electrolyte outlet, and the circulating liquid inlet are sequentially connected to form a first circulation loop, and a first control valve is provided on the first circulation loop; the first heat exchanger has a first electrolyte flow path and a first coolant flow path that are isolated from each other. The first heat exchanger is provided on the first circulation loop, and both ends of the first electrolyte flow path are respectively communicated with the electrolyte outlet and the circulating liquid inlet; the first circulation pump is provided on the first circulation loop; the circulating liquid outlet, the second circulation pump, and the circulating liquid inlet are sequentially connected to form a second circulation loop, and a second control valve is provided on the second circulation loop; the electrolyte in the second circulation loop can exchange heat with the heat generated by the power supply system.

[0005] In one embodiment, a part of the second circulation loop extends into the power supply system.

[0006] In one embodiment, the hydrogen production system further includes a second heat exchanger, and the second heat exchanger includes a second electrolyte flow path and a heat exchange liquid flow path that are isolated from each other; the second electrolyte flow path is located on the second circulation loop and is provided between the circulating liquid inlet and the circulating liquid outlet;

[0007] A heat exchange liquid pipe is provided in the hydrogen production system, and the heat exchange liquid flow path is connected to the heat exchange liquid pipe to jointly form a third circulation loop.

[0008] In one embodiment, a third control valve is provided on the third circulation loop.

[0009] In one embodiment, a third circulation pump is further provided on the third circulation loop.

[0010] In one embodiment, the hydrogen production system further includes a coolant source having a first coolant outlet, and the first coolant outlet is communicated with the third circulation loop.

[0011] In one embodiment, a fourth control valve is provided between the first coolant outlet and the third circulation loop.

[0012] In one embodiment, the hydrogen production system further includes a coolant source having a second coolant outlet and a coolant return port, and the power supply system further includes a coolant pipe. The second coolant outlet, the coolant pipe and the coolant return port are sequentially communicated to form a cooling circulation loop.

[0013] In one embodiment, there are two gas-liquid separators, and the two gas-liquid separators are arranged in parallel and are respectively a hydrogen separator and an oxygen separator;

[0014] And / or, there are at least two first control valves, and the at least two first control valves are respectively arranged between the electrolytic cell and the gas-liquid separator and between the first heat exchanger and the electrolytic cell.

[0015] In one embodiment, there are at least two electrolytic cells, and the at least two electrolytic cells are arranged in parallel.

[0016] The technical solution of this application forms a first circulation loop by connecting the mixture outlet of the electrolytic cell, the mixture inlet of the gas-liquid separator, the electrolyte outlet of the gas-liquid separator, and the circulating liquid inlet of the electrolytic cell in sequence. A first heat exchanger is provided on the first circulation loop. The first heat exchanger includes a first electrolyte flow path and a first coolant flow path that are isolated from each other. The two ends of the first electrolyte flow path are respectively connected to the electrolyte outlet and the circulating liquid inlet, so that the electrolytic cell can work normally. When the electrolytic cell is working normally, the mixture generated by electrolysis enters the gas-liquid separator for gas-liquid separation. After separation, the separated electrolyte flows out through the electrolyte outlet of the gas-liquid separator and enters the first electrolyte flow path in the first heat exchanger to exchange heat with the coolant in the first coolant flow path, thereby ensuring that the temperature of the electrolyte flowing back to the electrolytic cell through the circulating liquid inlet will not be too high. By setting a second circulation pump, the circulating liquid outlet of the electrolytic cell, the second circulation pump, and the circulating liquid inlet are connected in sequence to form a second circulation loop. In addition, by setting a power supply system, and the electrolyte in the second circulation loop can exchange heat with the heat generated by the power supply system, then under the power of the second circulation pump, the electrolyte in the electrolytic cell can flow out from the circulating liquid outlet, exchange heat with the heat generated by the power supply system, and then the temperature of the electrolyte in the second circulation loop rises and then flows back into the electrolytic cell from the circulating liquid inlet. In this way, the electrolyte in the electrolytic cell can be heated to maintain it near the working temperature, so that when it needs to be put into work, the temperature of the electrolyte in the electrolytic cell meets the requirements, thereby improving the response speed of the electrolytic cell in the scenario of hydrogen production by renewable energy fluctuations. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0018] Figure 1 FIG. is a schematic structural diagram of an embodiment of a hydrogen production system provided by the present application with one gas-liquid separator;

[0019] Figure 2 FIG. is a schematic structural diagram of an embodiment of a hydrogen production system provided by the present application with two gas-liquid separators;

[0020] Figure 3 FIG. is a schematic structural diagram of another embodiment of a hydrogen production system provided by the present application with one gas-liquid separator;

[0021] Figure 4 FIG. is a schematic structural diagram of another embodiment of a hydrogen production system provided by the present application with two gas-liquid separators.

[0022] Description of the attached drawing reference numerals:

[0023] 100, electrolytic cell; 101, mixture outlet; 102, circulating liquid outlet; 103, circulating liquid inlet;

[0024] 200, gas-liquid separator; 201, mixture inlet; 202, electrolyte outlet;

[0025] 300, first heat exchanger;

[0026] 400, second circulation pump;

[0027] 500, power supply system;

[0028] 600, second heat exchanger;

[0029] 700, third circulation pump;

[0030] 800, coolant source; 801, first coolant outlet; 802, second coolant outlet; 803, coolant return port;

[0031] 910, first circulation pump; 920, first filter; 930, second filter;

[0032] 110, first control valve; 120, second control valve; 130, third control valve; 140, fourth control valve.

[0033] The realization of the purpose of this application, functional features and advantages will be further described in conjunction with the embodiments with reference to the accompanying drawings. Detailed implementation manners

[0034] Next, the technical solutions in the embodiments of this application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without making creative efforts belong to the scope of protection of this application.

[0035] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of this application, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0036] In addition, if the embodiments of the present application involve descriptions such as "first" and "second", the descriptions of "first", "second", etc. are for descriptive purposes only, and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel scenarios. Taking "A and / or B" as an example, it includes scenario A, or scenario B, or the scenario where both A and B are satisfied simultaneously. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present application.

[0037] The present application provides a hydrogen production system.

[0038] In an embodiment of the present application, please refer to Figures 1 to 4 , the hydrogen production system includes an electrolytic cell 100, a gas-liquid separator 200, a first heat exchanger 300, a second circulation pump 400, and a power supply system 500. The electrolytic cell 100 has a mixture outlet 101, a circulating liquid outlet 102, and a circulating liquid inlet 103; the gas-liquid separator 200 has a mixture inlet 201 and an electrolyte outlet 202; the mixture outlet 101, the mixture inlet 201, the electrolyte outlet 202, and the circulating liquid inlet 103 are sequentially connected to form a first circulation loop, and a first control valve 110 is provided on the first circulation loop; the first heat exchanger 300 has a first electrolyte flow path and a first coolant flow path that are isolated from each other. The first heat exchanger 300 is provided on the first circulation loop, and both ends of the first electrolyte flow path are respectively communicated with the electrolyte outlet 202 and the circulating liquid inlet 103; the circulating liquid outlet 102, the second circulation pump 400, and the circulating liquid inlet 103 are sequentially connected to form a second circulation loop, and a second control valve 120 is provided on the second circulation loop; the electrolyte in the second circulation loop can exchange heat with the heat generated by the power supply system 500.

[0039] After the electrolyte is electrolyzed in the electrolytic cell 100 to generate gas, some electrolyte will inevitably be carried in the gas. Therefore, the mixture discharged from the mixture outlet 101 of the electrolytic cell 100 is a mixture of gas and part of the electrolyte.

[0040] The gas-liquid separator 200 is used to separate the gas with electrolyte discharged from the electrolyte, and then discharge the relatively pure gas. The gas-liquid separator 200 has a mixture inlet 201, and the mixture inlet 201 is communicated with the mixture outlet 101 of the electrolytic cell 100, so as to facilitate introducing the mixture discharged from the electrolyte into the gas-liquid separator 200. After the mixture entering the gas-liquid separator 200 is subjected to gas-liquid separation, the electrolyte in the liquid state flows out from the electrolyte outlet 202 of the gas-liquid separator 200, and the electrolyte flowing out from the electrolyte outlet 202 of the gas-liquid separator 200 finally flows into the electrolytic cell 100 through the circulating liquid inlet 103 of the electrolytic cell 100. The mixture outlet 101 of the electrolytic cell 100, the mixture inlet 201 of the gas-liquid separator 200, the electrolyte outlet 202 of the gas-liquid separator 200, and the circulating liquid inlet 103 of the electrolytic cell 100 are connected in sequence to form a circulation loop, which is temporarily defined as the first circulation loop. Such a setting can improve the recycling rate of the lye. It should be noted that the gas-liquid separator 200 also includes a gas outlet, and the gas after gas-liquid separation is discharged from the gas outlet. The gas-liquid separator 200 in the technical solution of the present application can be provided with one or two. When only one gas-liquid separator 200 is provided, the gas-liquid separator 200 can be a hydrogen separator or an oxygen separator. When two gas-liquid separators 200 are provided, the two gas-liquid separators 200 are arranged in parallel, and the two gas-liquid separators 200 can be a hydrogen separator and an oxygen separator respectively. Such a setting can achieve the effect of separately separating the electrolyzed hydrogen and oxygen, so that purer hydrogen and oxygen can be prepared respectively.

[0041] The electrolyte flowing out from the electrolyte outlet 202 of the gas-liquid separator 200 has a high temperature. By providing a first heat exchanger 300 on the first circulation loop, both ends of the first electrolyte flow path of the first heat exchanger 300 are respectively communicated with the electrolyte outlet 202 and the circulating liquid inlet 103. The first heat exchanger 300 also has a first coolant flow path isolated from the first electrolyte flow path. Then, the electrolyte flowing out from the electrolyte outlet 202 of the gas-liquid separator 200 can exchange heat with the coolant in the first coolant flow path in the first electrolyte flow path of the first heat exchanger 300, so as to achieve the cooling effect on the electrolyte, and ensure that the temperature of the electrolyte flowing back into the electrolytic cell 100 is not too high.

[0042] When the temperature of the electrolyte in the electrolytic cell 100 is relatively low, the electrolyte in the electrolytic cell 100 is preheated so that the temperature of the electrolyte rises to an appropriate temperature and then switched to the working state, which can quickly respond to the volatility of the renewable energy power generation. By setting the second circulation pump 400, the circulation liquid outlet 102, the second circulation pump 400, and the circulation liquid inlet 103 are connected in sequence to form a second circulation loop, and the electrolyte in the second circulation loop can exchange heat with the heat generated by the power supply system 500. On the one hand, the waste heat generated by the power supply system 500 can heat the electrolyte in the second circulation loop, so that the temperature of the electrolyte rises when it flows back into the electrolytic cell 100 from the circulation liquid inlet 103, so that it can quickly respond to the volatility of the renewable energy power generation. On the other hand, the electrolyte in the second circulation loop can also cool and dissipate heat from the power supply system 500. Specifically, when the second circulation loop exchanges heat with the heat generated by the power supply system 500, a part of the second circulation loop can extend into the power supply system 500 to directly contact and exchange heat with the hot air in the power supply system 500; or a circulation pipeline is led out from the power supply system 500, and a flowing liquid is introduced into the circulation pipeline. The flowing liquid absorbs heat in the power supply system 500 and flows to the part of the circulation pipeline extending outside the power supply system 500, where it is close to or in contact with the second circulation loop to dissipate heat. At the same time, the electrolyte in the second circulation loop absorbs the heat of the flowing liquid in the part of the circulation pipeline extending outside the power supply system 500 to achieve the effect of heating the electrolyte, so that the temperature of the electrolyte flowing in from the circulation liquid inlet 103 is not too low, so as to more quickly respond to the volatility of the renewable energy power generation. The circulation liquid inlet 103 on the first circulation loop and the circulation liquid inlet 103 on the second circulation loop can be the same inlet or different inlets.

[0043] By providing a first control valve 110 on the first circulation loop and a second control valve 120 on the second circulation loop, the opening and closing state of the first control valve 110 can be controlled to further control whether the electrolytic cell 100 is in a working state or not, and the opening and closing state of the second control valve 120 can be controlled to further control whether the electrolyte in the electrolytic cell 100 is in a circulating heating state. It can be understood that when it is necessary to heat the electrolyte in the electrolytic cell 100, the first control valve 110 is closed and the second control valve 120 is opened to make the second circulation loop unobstructed, so that the electrolyte flows in the second circulation loop; when the electrolytic cell 100 needs to work normally, the first control valve 110 is opened and the second control valve 120 is closed to make the first circulation loop unobstructed, thereby ensuring that the electrolytic cell 100 can work normally. Specifically, the first control valve 110 can be provided between the mixture outlet 101 of the electrolytic cell 100 and the mixture inlet 201 of the gas-liquid separator 200; or the first control valve 110 can be provided between the gas-liquid separator 200 and the first heat exchanger 300; or the first control valve 110 can be provided between the first heat exchanger 300 and the electrolytic cell 100. Or there are at least two first control valves 110, and at least two first control valves 110 are respectively provided between the electrolytic cell 100 and the gas-liquid separator 200 and between the first heat exchanger 300 and the electrolytic cell 100; with such a setting, the on-off state of the first circulation loop can be controlled more precisely. For example, when it is necessary to make the first circulation loop in a disconnected state, after one of the first control valves 110 fails, the first circulation loop can still be controlled to be in a disconnected state through other first control valves 110; in addition, with such a setting, it is also beneficial to disassemble other components on the first circulation loop. The second control valve 120 can be provided between the second circulation pump 400 and the circulation liquid inlet 103, or the second control valve 120 can be provided between the second circulation pump 400 and the circulation liquid outlet 102.

[0044] The technical solution of this application forms a first circulation loop by connecting the mixture outlet 101 of the electrolytic cell 100, the mixture inlet 201 of the gas-liquid separator 200, the electrolyte outlet 202 of the gas-liquid separator 200, and the circulating liquid inlet 103 of the electrolytic cell 100 in sequence. The first heat exchanger 300 is arranged on the first circulation loop. The first heat exchanger 300 includes a first electrolyte flow path and a first coolant flow path that are isolated from each other. The two ends of the first electrolyte flow path are respectively communicated with the electrolyte outlet 202 and the circulating liquid inlet 103, so that the electrolytic cell 100 can work normally. When the electrolytic cell 100 works normally, the mixture generated by electrolysis enters the gas-liquid separator 200 for gas-liquid separation. After separation, the separated electrolyte flows out through the electrolyte outlet 202 of the gas-liquid separator 200 and enters the first electrolyte flow path in the first heat exchanger 300 to exchange heat with the coolant in the first coolant flow path, so as to ensure that the temperature of the electrolyte flowing back to the electrolytic cell 100 through the circulating liquid inlet 103 will not be too high. By setting the second circulation pump 400, the circulating liquid outlet 102 of the electrolytic cell 100, the second circulation pump 400, and the circulating liquid inlet 103 are connected in sequence to form a second circulation loop. In addition, by setting the power supply system 500, and the electrolyte in the second circulation loop can exchange heat with the heat generated by the power supply system 500, then under the power of the second circulation pump 400, the electrolyte in the electrolytic cell 100 can flow out from the circulating liquid outlet 102, exchange heat with the heat generated by the power supply system 500, and then the temperature of the electrolyte in the second circulation loop rises and then flows back into the electrolytic cell 100 from the circulating liquid inlet 103. In this way, the electrolyte in the electrolytic cell 100 can be heated to maintain it near the working temperature, so that when it needs to be put into work, the temperature of the electrolyte in the electrolytic cell 100 meets the requirements, thereby improving the response speed of the electrolytic cell 100 in the scenario of hydrogen production by renewable energy fluctuations. At the same time, the cooling effect of the power supply system 500 is also achieved.

[0045] In an embodiment of this application, please refer to Figure 1 and Figure 2 , a part of the second circulation loop extends into the power supply system 500.

[0046] By extending a part of the second circulation loop into the power supply system 500, a part of the second circulation loop can be directly in contact with the hot air in the power supply system 500, so that the temperature of the electrolyte in the second circulation loop rises significantly, thereby improving the heat exchange efficiency. In addition, by setting it in this way, the number of heat exchangers can also be reduced.

[0047] In another embodiment of this application, please refer to Figure 3 and Figure 4, the hydrogen production system further includes a second heat exchanger 600. The second heat exchanger 600 includes a second electrolyte flow path and a heat exchange liquid flow path that are isolated from each other. The second electrolyte flow path is located on the second circulation loop and is provided between the circulation liquid inlet 103 and the circulation liquid outlet 102. A heat exchange liquid pipe is provided in the hydrogen production system, and the heat exchange liquid flow path is connected to the heat exchange liquid pipe to jointly form a third circulation loop.

[0048] By including a second electrolyte flow path and a heat exchange liquid flow path that are isolated from each other in the second heat exchanger 600, and the second electrolyte flow path is located on the second circulation loop, the second electrolyte flow path serves as a part of the second circulation loop and exchanges heat with the heat exchange liquid in the heat exchange liquid flow path, that is, the electrolyte in the second circulation loop can exchange heat with the heat exchange liquid in the heat exchange liquid flow path. By providing a heat exchange liquid pipe in the hydrogen production system, the heat exchange liquid pipe is connected to the heat exchange liquid flow path to jointly form a third circulation loop. After the heat exchange liquid in the third circulation loop enters the heat exchange liquid pipe in the hydrogen production system, it exchanges heat with the hot air in the hydrogen production system, so that the temperature of the heat exchange liquid in the heat exchange liquid pipe rises, and then flows into the heat exchange liquid flow path of the second heat exchanger 600. The heat exchange liquid exchanges heat with the electrolyte in the second electrolyte flow path again, so that the temperature of the electrolyte rises and the temperature of the heat exchange liquid drops. Then the heat exchange liquid flows back into the heat exchange liquid pipe in the hydrogen production system again. After the electrolyte in the second electrolyte flow path is heated, it flows to the circulation liquid inlet 103 of the electrolyzer 100 and flows back into the electrolyzer 100 through the circulation liquid inlet 103. Specifically, the heat exchange liquid can be water or other liquids, as long as the heat exchange liquid in the heat exchange liquid flow path does not mix with the electrolyte in the second electrolyte flow path. When there are multiple electrolyzers 100, such a setting can avoid gas evolution caused by direct mixing of hot and cold electrolytes, which affects gas quality and system safety; such a setting also avoids the temperature interaction adjustment between the electrolyzer 100 that is being circulated and heated and the electrolytes of other normal working electrolyzers 100, and the operation is simpler, improving the stability of system operation.

[0049] Further, please refer to Figure 3 and Figure 4 , a third control valve 130 is provided on the third circulation loop.

[0050] By providing a third control valve 130 on the third circulation loop, the heat exchange between the electrolyte in the second circulation loop and the heat exchange liquid in the third circulation loop can be controlled according to the actual situation, improving the flexibility of use of the hydrogen production system. For example, when it is necessary to heat the electrolyte in the electrolyzer 100, the third control valve 130 is opened, so that the electrolyte in the second circulation loop can exchange heat with the heat exchange liquid in the third circulation loop to achieve the effect that the electrolyte on the second circulation loop can be heated and raised in temperature.

[0051] Further, please refer to Figure 3 andFigure 4 , a third circulation pump 700 is further provided on the third circulation loop.

[0052] By providing the third circulation pump 700 on the third circulation loop, it is beneficial to provide sufficient power for the flow of the heat exchange liquid on the third circulation loop, and then perform a good heat exchange process with the electrolyte in the second circulation loop, improving the heating efficiency of the electrolyte in the second circulation loop.

[0053] In the embodiment of the present application, please refer to Figure 3 and Figure 4 , the hydrogen production system further includes a coolant source 800. The coolant source 800 has a first coolant outlet 801, and the first coolant outlet 801 is connected to the third circulation loop.

[0054] By providing the coolant source 800, and the coolant source 800 has a first cooling outlet connected to the third circulation loop, the coolant in the coolant source 800 can flow into the third circulation loop through the first coolant outlet 801, so that there can be enough heat exchange liquid flowing in the third circulation loop.

[0055] Of course, in other examples, the coolant source 800 may not be provided, but instead, the heat exchange liquid is pre-filled into the heat exchange liquid flow path and / or the heat exchange liquid pipe before forming the third circulation loop, and then the heat exchange liquid flow path and the heat exchange liquid pipe are connected to form the third circulation loop by welding or other means such as interfaces.

[0056] Based on the solution that the hydrogen production system includes the coolant source 800, further, please refer to Figure 3 and Figure 4 , a fourth control valve 140 is provided between the first coolant outlet 801 and the third circulation loop.

[0057] By providing the fourth control valve 140 between the first coolant outlet 801 and the third circulation loop, the injection of the coolant from the coolant source 800 into the third circulation loop can be controlled through the fourth control valve 140. For example, at the beginning, there is no heat exchange liquid in the third circulation loop, then the fourth control valve 140 can be in an open state to facilitate the coolant in the coolant source 800 to enter the third circulation loop through the fourth control valve 140. After an appropriate amount of coolant is injected into the third circulation loop, the fourth control valve 140 can be closed so that the coolant only circulates in the third circulation loop.

[0058] In the embodiment of the present application, please refer to Figures 1 to 4, the hydrogen production system further includes a coolant source 800, the coolant source 800 has a second coolant outlet 802 and a coolant return port 803, the power supply system 500 further includes a coolant pipe, and the second coolant outlet 802, the coolant pipe, and the coolant return port 803 are connected in sequence to form a cooling circulation loop.

[0059] With such a setting, the coolant pipe can also cool down the power supply system 500, thereby enhancing the stability of the power supply system 500 and ensuring that the power supply system 500 can operate normally. In addition, the coolant pipe and the above-mentioned second circulation loop each share a part of the heat of the power supply system 500, thereby improving the heat dissipation efficiency of the power supply system 500.

[0060] In an embodiment of the present application, please refer to Figures 1 to 4 , a first circulation pump 910 is further provided on the first circulation loop.

[0061] By providing the first circulation pump 910 on the first circulation loop, it is beneficial for the electrolyte to flow on the first circulation loop under normal working conditions, improving the working efficiency of the electrolyte.

[0062] Furthermore, please refer to Figures 1 to 4 , a first filter 920 is further provided on the first circulation loop.

[0063] By providing the first filter 920 on the first circulation loop, the first filter 920 can filter the solid particles on the first circulation loop, thereby ensuring that the electrolyte in the electrolytic cell 100 after circulation has a relatively high purity. Specifically, the first filter 920 can be provided between the electrolyte outlet 202 and the circulating liquid inlet 103, or the first filter 920 can also be provided between the mixture outlet 101 and the mixture inlet 201.

[0064] Furthermore, please refer to Figures 1 to 4 , a second filter 930 is further provided on the second circulation loop.

[0065] By providing the first filter 920 on the first circulation loop, the first filter 920 can filter the solid particles on the second circulation loop, thereby ensuring that the electrolyte with a relatively high purity returns to the electrolytic cell 100 after the electrolyte circulation is heated. Specifically, the second filter 930 can be provided between the second circulation pump 400 and the circulating liquid inlet 103, or it can also be provided between the second circulation pump 400 and the circulating liquid outlet 102.

[0066] In an embodiment of the present application, please refer to Figures 1 to 4 , at least two electrolytic cells 100 are provided, and the at least two electrolytic cells 100 are arranged in parallel.

[0067] When there are at least two electrolyzers 100, if the power generation is low, only one or a small number of electrolyzers 100 in the system can operate simultaneously, and some of the electrolyzers 100 are in a non-operating state. The electrolyte in the non-operating electrolyzers 100 can be circulated and heated on the second circulation loop, waiting to enter the standby state when the temperature is appropriate, so as to facilitate these electrolyzers 100 to immediately enter the operating state. Or before the first electrolyzer 100 starts working, the first electrolyzer 100 can be circulated and heated first, and then the first electrolyzer 100 can be put into the operating state.

[0068] Specifically, when there are multiple electrolyzers 100, a first control valve 110 is respectively provided between the mixture outlet 101 of each electrolyzer 100 and the mixture inlet 201 of the gas-liquid separator 200. Therefore, each control valve can control whether the corresponding electrolyzer 100 can enter the normal operating state. A second control valve 120 is respectively provided between the circulating liquid outlet 102 of each electrolyzer 100 and the second circulation pump 400. Thus, each second control valve 120 can control whether the electrolyte in the corresponding electrolyzer 100 can be heated through the second circulation loop. And / or, a second control valve 120 is provided on the pipeline between the circulating liquid inlet 103 of each electrolyzer 100 and the second circulation pump 400. Thus, each second control valve 120 can control whether the electrolyte in the corresponding electrolyzer 100 can be heated through the second circulation loop. It should be noted that before the first electrolyzer 100 starts working, the second control valve 120 connected to the first electrolyzer 100 can be opened, so that the electrolyte in the first electrolyzer 100 circulates in the second circulation loop driven by the second circulation pump 400. At the same time, heat exchange is carried out with the heat generated by the power supply system 500, so as to achieve the effect of heating the electrolyte in the first electrolyzer 100. After the electrolyte in the first electrolyzer 100 is heated to an appropriate temperature, the second control valve 120 connected to the first electrolyzer 100 is closed, and the first control valve 110 connected to the first electrolyzer 100 is opened to switch the first electrolyzer 100 to the normal operating state. With such a setting, rapid heating of the electrolyte in the first electrolyzer 100 can be achieved, thereby improving its response speed. After the first electrolyzer 100 is switched to the normal operating state, the second control valve 120 corresponding to one or more other electrolyzers 100 can be opened, so that the electrolyte in one other electrolyzer 100 flows on the second circulation loop to enter the standby state or the electrolytes in multiple electrolyzers 100 flow on the second circulation loop simultaneously and enter the standby state simultaneously.

[0069] The above are only exemplary embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structural transformation made under the technical concept of the present application by using the content of the specification and drawings of the present application, or any direct / indirect application in other related technical fields, is included in the patent protection scope of the present application.

Claims

1. A hydrogen production system, characterized in that: include: An electrolytic cell having a mixture outlet, a circulating liquid outlet, and a circulating liquid inlet; A gas-liquid separator, the gas-liquid separator having a mixture inlet and an electrolyte outlet; the mixture outlet, the mixture inlet, the electrolyte outlet and the circulating liquid inlet are sequentially connected to form a first circulation loop, and a first control valve is provided on the first circulation loop; A first heat exchanger, wherein the first heat exchanger has a first electrolyte flow path and a first coolant flow path that are isolated from each other, the first heat exchanger is disposed on the first circulation loop, and two ends of the first electrolyte flow path are respectively connected to the electrolyte outlet and the circulating liquid inlet; a first circulation pump, wherein the first circulation pump is arranged on the first circulation loop; a second circulation pump, the circulation liquid outlet, the second circulation pump and the circulation liquid inlet are sequentially connected to form a second circulation loop, and a second control valve is provided on the second circulation loop; and The power supply system, the electrolyte in the second circulation loop can exchange heat with the heat generated by the power supply system.

2. The hydrogen production system according to claim 1, characterized in that: A portion of the second circulation loop extends into the power supply system.

3. The hydrogen production system according to claim 1, characterized in that: The hydrogen production system further includes a second heat exchanger, the second heat exchanger including a second electrolyte flow path and a heat exchange liquid flow path isolated from each other; the second electrolyte flow path is located on the second circulation loop and is arranged between the circulating liquid inlet and the circulating liquid outlet; A heat exchange liquid pipe is provided in the hydrogen production system, the heat exchange liquid flow path is connected to the heat exchange liquid pipe and together form a third circulation loop, and a portion of the heat exchange liquid pipe extends into the power supply system.

4. The hydrogen production system according to claim 3, characterized in that: The third circulation loop is provided with a third control valve.

5. The hydrogen production system according to claim 4, characterized in that: The third circulation loop is also provided with a third circulation pump.

6. The hydrogen production system according to claim 3, characterized in that: The hydrogen production system further includes a coolant source having a first coolant outlet, and the first coolant outlet is connected to the third circulation loop.

7. The hydrogen production system according to claim 6, characterized in that: A fourth control valve is provided between the first coolant outlet and the third circulation loop.

8. The hydrogen production system according to any one of claims 2 to 7, characterized in that: The hydrogen production system also includes a coolant source, which has a second coolant outlet and a coolant reflux port. The power supply system also includes a coolant pipe. The second coolant outlet, the coolant pipe and the coolant reflux port are connected in sequence to form a cooling circulation loop.

9. The hydrogen production system according to claim 1, characterized in that: The gas-liquid separators are provided with two, which are arranged in parallel and are respectively a hydrogen separator and an oxygen separator; And / or, at least two first control valves are provided, and at least two first control valves are respectively provided between the electrolytic cell and the gas-liquid separator and between the first heat exchanger and the electrolytic cell.

10. The hydrogen production system according to claim 1, characterized in that: There are at least two electrolytic cells, and at least two of the electrolytic cells are arranged in parallel.

Images