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 is provided with an electrolysis product flow path for electrolysis products to flow, the water electrolysis hydrogen production system comprises a gas-liquid separator and a heat exchanger, and the gas-liquid separator and the heat exchanger are sequentially distributed from the upstream to the downstream of the electrolysis product flow path; the heat exchanger is arranged above the gas-liquid separator, and the heat exchanger communicates with the gas-liquid separator through a first drainage flow path. According to the technical scheme, the first drainage flow path is arranged in the heat exchanger and the gas-liquid separator, so that the liquid phase in the heat exchanger can flow into the gas-liquid separator through the first drainage flow path, and the liquid phase in the heat exchanger can converge with the original liquid phase in the gas-liquid separator and then flow back into the electrolytic bath to continue the electrolytic reaction; and the liquid phase in the heat exchanger is prevented from being discharged outwards, so that the liquid phase in the heat exchanger is recycled.

Description

TECHNICAL FIELD

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

[0002] In the existing water electrolysis hydrogen production process, the gas-liquid mixture from the electrolytic tank is subjected to gas-liquid separation and washing, and then the gas phase enters the heat exchanger for cooling. The condensed liquid phase in the heat exchanger is discharged out of the water electrolysis hydrogen production system, causing waste of water resources. 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 recycle the liquid phase in the heat exchanger.

[0004] To achieve the above-mentioned purpose, the water electrolysis hydrogen production system provided by the present application has an electrolysis product flow path for the flow of electrolysis products. The water electrolysis hydrogen production system comprises a gas-liquid separator and a heat exchanger, which are distributed in sequence from upstream to downstream along the electrolysis product flow path. The heat exchanger is arranged above the gas-liquid separator, and the heat exchanger is connected to the gas-liquid separator through a first drainage flow path.

[0005] In an embodiment, the water electrolysis hydrogen production system further comprises a first liquid reservoir. The heat exchanger, the first liquid reservoir and the gas-liquid separator are distributed in sequence from top to bottom and along the upstream to downstream of the first drainage flow path.

[0006] In an embodiment, the gas outlet of the heat exchanger is provided with a gas-water separation structure.

[0007] In an embodiment, the heat exchanger has opposite first and second ends. The first end is provided with a liquid outlet connected to the first liquid reservoir. The liquid outlet is arranged on the bottom wall of the heat exchanger. The bottom wall of the heat exchanger forms an upward slope of at least 5% in the direction from the first end to the second end.

[0008] In an embodiment, the heat exchanger is connected to the first liquid reservoir through a first liquid discharge pipe, and the first liquid discharge pipe is provided with a first on-off valve.

[0009] In an embodiment, the first liquid reservoir is connected to the gas-liquid separator through a second liquid discharge pipe, and the second liquid discharge pipe is provided with a second on-off valve.

[0010] In an embodiment, the water electrolysis hydrogen production system further comprises a liquid level sensor arranged in the first liquid reservoir and capable of acquiring the liquid level in the first liquid reservoir.

[0011] In one embodiment, at least one of the first switching valve and the second switching valve is electrically connected to the liquid level sensor.

[0012] In one embodiment, the water electrolysis hydrogen production system further includes a gas-water separator. The heat exchanger and the gas-water separator are distributed sequentially from upstream to downstream along the electrolysis product flow path. The gas-water separator is connected to the first liquid storage tank through a second drainage flow path, and the second drainage flow path is provided with a third switching valve.

[0013] In one embodiment, the water electrolysis hydrogen production system further includes a gas-water separator and a second liquid storage tank. The heat exchanger and the gas-water separator are distributed sequentially from upstream to downstream along the electrolysis product flow path. The gas-water separator is connected to the second liquid storage tank through a third drainage flow path, and the third drainage flow path is equipped with a fourth switching valve.

[0014] The technical solution of this application sets a first drainage path in the heat exchanger and the gas-liquid separator, so that the liquid phase in the heat exchanger can flow to the gas-liquid separator through the first drainage path. Thus, the liquid phase in the heat exchanger can merge with the original liquid phase in the gas-liquid separator and flow back to the electrolytic cell to continue the electrolytic reaction, avoiding the discharge of liquid phase in the heat exchanger and thus realizing the recycling of liquid phase in the heat exchanger. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0016] Figure 1 A schematic diagram of a water electrolysis hydrogen production system according to an embodiment of the present application;

[0017] Figure 2 A schematic diagram of another embodiment of the water electrolysis hydrogen production system provided in this application;

[0018] Figure 3 A schematic diagram of another embodiment of the water electrolysis hydrogen production system provided in this application;

[0019] Figure 4 A schematic diagram of another embodiment of the water electrolysis hydrogen production system provided in this application;

[0020] Figure 5 for Figure 4 A schematic diagram of the structure of one embodiment of the heat exchanger.

[0021] Explanation of icon numbers:

[0022] 10, water electrolysis hydrogen production system; 100, gas-liquid separator; 200, heat exchanger; 300, first liquid accumulator; 400, second liquid accumulator; 500, liquid level sensor; 600, gas-water separation device; 210, first end; 220, second end; 230, liquid outlet; 240, gas-water separation structure; 710, first liquid discharge pipe; 720, second liquid discharge pipe; 810, first switch valve; 820, second switch valve; 830, third switch valve; 840, fourth switch valve.

[0023] 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

[0024] 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 skilled in the art without creative work fall within the scope of protection of the present application.

[0025] It should be noted that if the present application has directionality indication (such as up, down, left, right, front, back, etc.) in the embodiments, the directionality indication is only used to explain the relative position relationship, movement condition, etc. between the components in a certain posture, and if the certain posture changes, the directionality indication also changes accordingly.

[0026] In addition, if the present application has the description of "first", "second" and the like in the embodiments, 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 explicitly or implicitly include at least one of the features. In addition, "and / or" or "and / or" appears throughout the text, which means that the three parallel schemes include A scheme, or B scheme, or A and B schemes are satisfied at the same time. 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, nor within the scope of protection claimed by the present application.

[0027] The present application proposes a water electrolysis hydrogen production system 10.

[0028] Please refer to Figure 1In an embodiment of the present application, the water electrolysis hydrogen production system 10 has an electrolysis product flow path for electrolysis product flow, and the water electrolysis hydrogen production system 10 comprises a gas-liquid separator 100 and a heat exchanger 200, the gas-liquid separator 100 and the heat exchanger 200 are arranged in sequence along the electrolysis product flow path from upstream to downstream, and the heat exchanger 200 is arranged above the gas-liquid separator 100, and the heat exchanger 200 is connected to the gas-liquid separator 100 through a first drainage flow path.

[0029] Specifically, the electrolytic cell of the water electrolysis hydrogen production system 10 can decompose water into hydrogen and oxygen. The electrolytic cell generally comprises a pair of electrodes (cathode and anode) and an electrolyte solution, and the electrolyte solution is generally KOH lye in the case of an alkaline electrolytic cell. When a direct current is applied to the electrodes, the water in the electrolytic cell will be decomposed on the surface of the electrodes, and will be reduced to hydrogen and hydroxyl ions at the cathode, and will be oxidized to oxygen and hydrogen ions at the anode. The gas generated on the surface of the corresponding electrode of the electrolytic cell will carry a small amount of lye, and the gas-liquid mixture discharged from the electrolysis product outlet of the electrolytic cell is a hydrogen-alkali gas-liquid mixture or an oxygen-alkali gas-liquid mixture. The flow path through which the gas-liquid mixture is processed in sequence between the electrolysis product outlet of the electrolytic cell and the gas outlet of the water electrolysis hydrogen production system 10, i.e., the electrolysis product flow path of the water electrolysis hydrogen production system 10, comprises gas-liquid separation, washing and cooling, heat exchange, and gas-water separation.

[0030] After the gas-liquid mixture leaves the electrolytic cell, it enters the gas-liquid separator 100 along the electrolysis product flow path. The gas-liquid separator 100 is used to preliminarily separate the lye in the gas-liquid mixture, and the liquid phase of the gas-liquid mixture remains in the gas-liquid separator 100 after the preliminary separation in the gas-liquid separator 100. The temperature of the gas-liquid mixture discharged from the electrolytic cell is usually high, which can reach more than 60℃. After the gas-liquid separation and other operations, the gas-liquid mixture still has high temperature and humidity. The heat exchanger 200 is used to cool the gas-liquid mixture. The gas phase in the gas-liquid separator 100 enters the heat exchanger 200 after being washed, and the temperature of the gas phase is reduced, and finally the gas phase leaves the water electrolysis hydrogen production system 10 from the gas outlet. The water carried by the gas phase in the heat exchanger 200 is condensed and remains as liquid phase at the bottom of the heat exchanger 200.

[0031] The first drainage flow path is provided between the heat exchanger 200 and the gas-liquid separator 100, and the liquid phase in the heat exchanger 200 can flow into the gas-liquid separator 100 through the first drainage flow path, and then flow back to the electrolytic cell together with the original liquid phase in the gas-liquid separator 100 to continue the electrolysis reaction, thereby avoiding the discharge of the liquid phase in the heat exchanger 200, achieving the recycling of the liquid phase in the heat exchanger 200, and reducing the waste of water resources.

[0032] The technical scheme of the present application sets the first drainage flow path in the heat exchanger 200 and the gas-liquid separator 100, so that the liquid phase in the heat exchanger 200 can flow to the gas-liquid separator 100 through the first drainage flow path, thereby the liquid phase in the heat exchanger 200 can be combined with the original liquid phase in the gas-liquid separator 100 and then return to the electrolytic tank to continue the electrolysis reaction, avoiding the liquid phase in the heat exchanger 200 from being discharged, and thus realizing the recycling of the liquid phase in the heat exchanger 200.

[0033] In an embodiment, referring to Figure 1 , the water electrolysis hydrogen production system 10 further comprises a first liquid reservoir 300, and the heat exchanger 200, the first liquid reservoir 300 and the gas-liquid separator 100 are sequentially arranged from top to bottom and sequentially arranged from upstream to downstream along the first drainage flow path.

[0034] The first liquid reservoir 300 can be a cavity shell such as a water tank, etc.; it can also be a pipe, a container or other structure capable of storing materials. The first liquid reservoir 300 plays a role in preventing the liquid phase in the gas-liquid separator 100 from backflowing. The liquid phase in the heat exchanger 200 is first discharged into the first liquid reservoir 300, and then the liquid phase in the first liquid reservoir 300 is discharged above the liquid level of the gas-liquid separator 100, so as to reduce the risk of the liquid phase in the gas-liquid separator 100 directly backflowing into the first liquid reservoir 300.

[0035] In an embodiment, referring to Figure 5 , the gas outlet of the heat exchanger 200 is provided with a gas-water separation structure 240.

[0036] When the gas phase after cooling leaves the heat exchanger 200 from the gas outlet of the heat exchanger 200, the gas-water separation structure 240 can intercept the liquid phase therein, so that it flows into the bottom of the heat exchanger 200, and then flows into the first liquid reservoir 300 through the first drainage flow path. The gas-water separation structure 240 can be a metal mesh, a mixed wire mesh, a fiber or the like.

[0037] In other embodiments, the edge of the gas outlet of the heat exchanger 200 can also extend outwardly and / or inwardly by a certain distance to increase the length of the gas-water separation structure 240, thereby improving the separation effect of the gas-water separation structure 240.

[0038] In an embodiment, referring to Figure 5 , the heat exchanger 200 has opposite first and second ends 210 and 220, the first end 210 is provided with a liquid outlet 230 communicating with the first liquid reservoir 300, the liquid outlet 230 is arranged on the bottom wall of the heat exchanger 200, and the bottom wall of the heat exchanger 200 forms an upward slope of at least 5% in the direction from the first end 210 to the second end 220.

[0039] The bottom wall of the heat exchanger 200 forms an upward slope of at least 5% in the direction from the first end 210 to the second end 220 in the installed state, so that the first end 210 where the liquid outlet 230 is located is lower, and the liquid phase in the heat exchanger 200 can be collected to the liquid outlet 230, so that the liquid phase in the heat exchanger 200 can be discharged as completely as possible from the liquid outlet 230. The heat exchanger 200 can be placed as a whole with an inclination, and the bottom wall of the heat exchanger 200 forms an upward slope of at least 5% in the direction from the first end 210 to the second end 220, that is, the axis of the heat exchanger 200 forms an angle with the horizontal line, and the angle is not less than 3°; or the heat exchanger 200 can be placed as a whole horizontally or vertically, and the bottom wall of the heat exchanger 200 is formed with a flow guide slope, and the flow guide slope forms an upward slope of at least 5%.

[0040] In an embodiment, referring to Figures 1 to 4 , the heat exchanger 200 is communicated with the first liquid reservoir 300 through the first liquid discharge pipe 710, and the first liquid discharge pipe 710 is provided with the first on-off valve 810.

[0041] The first liquid discharge pipe 710 is used to communicate the heat exchanger 200 and the first liquid reservoir 300, and ensures that the liquid phase in the heat exchanger 200 can be discharged into the first liquid reservoir 300. Through the first liquid discharge pipe 710, the distance between the heat exchanger 200 and the first liquid reservoir 300 can be flexibly adjusted. The first on-off valve 810 is installed on the first liquid discharge pipe 710, and is used to control the opening and closing of the water discharge flow path between the heat exchanger 200 and the first liquid reservoir 300, so that the discharge time and flow of the liquid phase in the heat exchanger 200 can be flexibly controlled, and the stable operation of the water electrolysis hydrogen production system 10 is ensured.

[0042] In other embodiments, the heat exchanger 200 and the first liquid reservoir 300 can also be communicated by welding, and can also be connected by flanges.

[0043] In an embodiment, referring to Figures 1 to 4 , the first liquid reservoir 300 is communicated with the gas-liquid separator 100 through the second liquid discharge pipe 720, and the second liquid discharge pipe 720 is provided with the second on-off valve 820.

[0044] The second liquid discharge pipe 720 is used to communicate the first liquid reservoir 300 and the gas-liquid separator 100, and ensures that the liquid phase in the first liquid reservoir 300 can be discharged into the gas-liquid separator 100. Through the second liquid discharge pipe 720, the distance between the gas-liquid separator 100 and the first liquid reservoir 300 can be flexibly adjusted. The second on-off valve 820 is installed on the second liquid discharge pipe 720, and is used to control the opening and closing of the water discharge flow path between the gas-liquid separator 100 and the first liquid reservoir 300, so that the discharge time and flow of the liquid phase in the first liquid reservoir 300 can be flexibly controlled, and the stable operation of the water electrolysis hydrogen production system 10 is ensured.

[0045] It can be understood that, referring to Figure 1 When the first switch valve 810 is open, the second switch valve 820 is closed, and the liquid phase in the heat exchanger 200 can be discharged into the first reservoir 300 through the first liquid discharge pipe 710. At this time, the second switch valve 820 is closed, and the gas phase and the liquid phase in the gas-liquid separator 100 cannot be sucked back into the heat exchanger 200 and the first reservoir 300. When the second switch valve 820 is open, the first switch valve 810 is closed, and the liquid phase in the first reservoir 300 can be discharged into the gas-liquid separator 100 through the second liquid discharge pipe 720. At this time, the first switch valve 810 is closed, and the gas phase and the liquid phase in the gas-liquid separator 100 cannot be sucked back into the heat exchanger 200.

[0046] In other embodiments, the gas-liquid separator 100 and the first reservoir 300 can also be connected by welding, and can also be connected by flanges.

[0047] In an embodiment, referring to Figure 3 and Figure 4 The water electrolysis hydrogen production system 10 further comprises a liquid level sensor 500, which is arranged in the first reservoir 300 and can obtain the liquid level in the first reservoir 300.

[0048] The liquid level sensor 500 can obtain the liquid level in the first reservoir 300, play an alarm and interlocking role, and ensure the safety and reliability of the liquid discharge process of the water electrolysis hydrogen production system 10; at the same time, by monitoring the liquid level in real time, potential problems can be found in advance, system failures can be prevented, and the reliability and safety of the water electrolysis hydrogen production system 10 can be improved.

[0049] In an embodiment, referring to Figure 3 and Figure 4 At least one of the first switch valve 810 and the second switch valve 820 is electrically connected with the liquid level sensor 500.

[0050] The liquid level information obtained by the liquid level sensor 500 in the gas-liquid separator 600 can be used for an automatic control system, and the opening and closing of the first switch valve 810 and / or the second switch valve 820 can be automatically controlled according to the change of the liquid level in the first reservoir 300, so that intelligent management is realized and manual intervention is reduced.

[0051] When the water electrolysis hydrogen production system 10 is running and no liquid discharge is performed, the first switch valve 810 is in an open state, the second switch valve 820 is in a closed state, and the liquid phase in the heat exchanger 200 flows into the first liquid reservoir 300. As the liquid level in the first liquid reservoir 300 rises, the liquid level value sensed by the sensor increases, and when it increases to the upper limit of the liquid level setting value, the first switch valve 810 is closed and the second switch valve 820 is opened. At this time, the liquid phase in the first liquid reservoir 300 flows into the liquid level above the gas-liquid separator 100, and when the liquid level in the first liquid reservoir 300 reaches the lower limit of the liquid level setting value, the first switch valve 810 is opened and the second switch valve 820 is closed.

[0052] In other embodiments, the water electrolysis hydrogen production system 10 can also use a timed liquid discharge scheme. When the water electrolysis hydrogen production system 10 is running and no liquid discharge is performed, the first switch valve 810 is in an open state, the second switch valve 820 is in a closed state, and the liquid phase in the heat exchanger 200 flows into the first liquid reservoir 300. As the liquid level in the first liquid reservoir 300 rises, the liquid level value sensed by the sensor increases, and after a period of time (such as 1 hour), the first switch valve 810 is closed and the second switch valve 820 is opened. After another period of time (such as 5 minutes), the first switch valve 810 is opened and the second switch valve 820 is closed. The specific discharge time is selected according to the actual situation.

[0053] In an embodiment, referring to Figure 3 , the water electrolysis hydrogen production system 10 further comprises a gas-water separator 600, and the heat exchanger 200 and the gas-water separator 600 are arranged in sequence along the upstream to downstream of the electrolysis product flow path. The gas-water separator 600 is connected to the first liquid reservoir 300 through a second liquid discharge flow path, and the second liquid discharge flow path is provided with a third switch valve 830.

[0054] The gas-water separator 600 separates water from the gas discharged from the gas outlet of the heat exchanger 200, ensures that the gas discharged from the water electrolysis hydrogen production system 10 is as dry as possible, and helps to reduce the impact of water content in the gas on subsequent processing equipment or storage equipment. The gas-water separator 600 and the first liquid reservoir 300 have a second liquid discharge flow path therebetween, the second liquid discharge flow path is provided with a third switch valve 830, and the third switch valve 830 can control the on-off between the gas-water separator 600 and the first liquid reservoir 300. When the third switch valve 830 is opened, the liquid phase in the gas-water separator 600 can flow into the first liquid reservoir 300 through the second liquid discharge flow path, and then flow into the gas-liquid separator 100 through the second liquid discharge pipe 720. After being combined with the original liquid phase in the gas-liquid separator 100, it returns to the electrolytic tank for further electrolysis reaction, avoiding the external discharge of the liquid phase in the gas-water separator 600, realizing the recycling of the liquid phase in the gas-water separator 600, and further reducing the waste of water resources.

[0055] In an embodiment, referring to Figure 3 The third switch valve 830 is electrically connected with the liquid level sensor 500.

[0056] When the water electrolysis hydrogen production system 10 is running and no liquid discharge is performed, the first switch valve 810 is in an open state, and the second switch valve 820 and the third switch valve 830 are in a closed state. The liquid phase in the heat exchanger 200 flows into the first liquid reservoir 300. As the liquid level on the first liquid reservoir 300 rises, the liquid level value sensed by the sensor increases. When the liquid level value reaches the upper limit of the liquid level setting value, the first switch valve 810 is closed, and the third switch valve 830 is opened. At this time, the liquid phase in the gas-water separator 600 flows above the liquid level of the first liquid reservoir 300. According to the liquid discharge condition of the gas-water separator 600, the third switch valve 830 is closed after a certain period of time, and then the second switch valve 820 is opened. At this time, the liquid phase in the first liquid reservoir 300 flows above the liquid level of the gas-liquid separator 100. When the liquid level in the first liquid reservoir 300 reaches the lower limit of the liquid level setting value, the first switch valve 810 is opened, and the second switch valve 820 and the third switch valve 830 are closed.

[0057] In other embodiments, the water electrolysis hydrogen production system 10 can also use a timed liquid discharge scheme. When the water electrolysis hydrogen production system 10 is running and no liquid discharge is performed, the first switch valve 810 is in an open state, and the second switch valve 820 and the third switch valve 830 are in a closed state. The liquid phase in the heat exchanger 200 flows into the first liquid reservoir 300. As the liquid level on the first liquid reservoir 300 rises, the liquid level value sensed by the sensor increases. After a period of time (such as 1 hour), the first switch valve 810 is closed, and the third switch valve 830 is opened. The liquid phase in the gas-water separator 600 flows into the first liquid reservoir 300. After a period of time (such as 2 minutes), the third switch valve 830 is closed. Then the second switch valve 820 is opened. At this time, the liquid phase in the first liquid reservoir 300 flows above the liquid level of the gas-liquid separator 100. After a period of time (such as 5 minutes), the second switch valve 820 is closed, and then the first switch valve 810 is opened to complete a liquid discharge cycle. The specific discharge time is selected according to the actual situation.

[0058] In an embodiment, referring to Figure 4 The water electrolysis hydrogen production system 10 further includes a gas-water separator 600 and a second liquid reservoir 400. The heat exchanger 200 and the gas-water separator 600 are arranged in sequence along the upstream to downstream of the electrolysis product flow path. The gas-water separator 600 is connected to the second liquid reservoir 400 through a third water discharge flow path. The third water discharge flow path is provided with a fourth switch valve 840.

[0059] Different from the embodiment that the liquid phase in the gas-water separator 600 is discharged to the first liquid reservoir 300, the liquid phase in the gas-water separator 600 in the present embodiment is discharged outside the second liquid reservoir 400 through a third water discharge channel. The third water discharge channel is provided between the gas-water separator 600 and the second liquid reservoir 400, and the third water discharge channel is provided with a fourth on-off valve 840, which can control the connection and disconnection between the gas-water separator 600 and the second liquid reservoir 400. When the fourth on-off valve 840 is opened, the liquid phase in the gas-water separator 600 can flow into the second liquid reservoir 400 through the third water discharge channel, and then be discharged from the water electrolysis hydrogen production system 10 through other pipelines. The liquid phase in the second liquid reservoir 400 can be applied to subsequent other processing equipment. A plurality of fourth on-off valves 840 can be provided on the third water discharge channel, and when one of the fourth on-off valves 840 fails, the other fourth on-off valves 840 can still continue to work, thereby ensuring the stability and reliability of the water electrolysis hydrogen production system 10.

[0060] The above description is only an exemplary embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structural transformation made by using the content of the present application and the drawings, or 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 by water electrolysis having an electrolysis product flow path for flow of electrolysis products, characterized by, The water electrolysis hydrogen production system comprises a gas-liquid separator and a heat exchanger, the gas-liquid separator and the heat exchanger are sequentially distributed along the upstream to downstream of the electrolysis product flow path, the heat exchanger is arranged above the gas-liquid separator, and the heat exchanger is communicated with the gas-liquid separator through a first drainage flow path.

2. The water electrolysis hydrogen generation system of claim 1, wherein, The water electrolysis hydrogen production system further comprises a first liquid reservoir, the heat exchanger, the first liquid reservoir and the gas-liquid separator are sequentially distributed from top to bottom, and sequentially distributed along the upstream to downstream of the first drainage flow path.

3. The water electrolysis hydrogen generation system of claim 2, wherein, The gas outlet of the heat exchanger is provided with a gas-water separation structure.

4. The water electrolysis hydrogen generation system of claim 2, wherein, The heat exchanger has opposite first and second ends, the first end is provided with a liquid outlet communicated with the first liquid reservoir, the liquid outlet is arranged on the bottom wall of the heat exchanger, and the bottom wall of the heat exchanger forms an upward slope of at least 5% in the direction from the first end to the second end.

5. The water electrolysis hydrogen generation system of claim 2, wherein, The heat exchanger is communicated with the first liquid reservoir through a first liquid discharge pipe, and the first liquid discharge pipe is provided with a first on-off valve.

6. The water electrolysis hydrogen generation system of claim 5, wherein, The first liquid reservoir is communicated with the gas-liquid separator through a second liquid discharge pipe, and the second liquid discharge pipe is provided with a second on-off valve.

7. The water electrolysis hydrogen generation system of claim 6, wherein, The water electrolysis hydrogen production system further comprises a liquid level sensor, the liquid level sensor is arranged in the first liquid reservoir and can obtain the liquid level in the first liquid reservoir.

8. The water electrolysis hydrogen generation system of claim 7, wherein, At least one of the first on-off valve and the second on-off valve is electrically connected with the liquid level sensor.

9. The water electrolysis hydrogen generation system of any one of claims 2 to 8, wherein, The water electrolysis hydrogen production system further comprises a gas-water separator, the heat exchanger and the gas-water separator are sequentially distributed along the upstream to downstream of the electrolysis product flow path, the gas-water separator is communicated with the first liquid reservoir through a second drainage flow path, and the second drainage flow path is provided with a third on-off valve.

10. The water electrolysis hydrogen generation system of any one of claims 1 to 8, wherein, The water electrolysis hydrogen production system further comprises a gas-water separator and a second liquid reservoir, the heat exchanger and the gas-water separator are sequentially distributed along the upstream to downstream of the electrolysis product flow path, the gas-water separator is communicated with the second liquid reservoir through a third drainage flow path, and the third drainage flow path is provided with a fourth on-off valve.

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