A gas-liquid separation method for a gas-liquid separation system of an electrolytic hydrogen production device

Abstract

The present invention discloses a gas-liquid separation method of a gas-liquid separation system of an electrolytic hydrogen production device, wherein the gas-liquid separation system comprises a gas-liquid separation tank, a gas cooler, a gas-water separator, an oxygen-water separator and a hydrogen-water separator; the gas-liquid separation method is as follows: the gas-liquid mixture enters the gas cooler after preliminary water removal in the gas-liquid separation tank, is first cooled from bottom to top, and then flows into a small gas-water separator for separation, the separated liquid flows out from the condensate outlet below the gas cooler, and the gas flows out from the gas outlet above the gas cooler; and enters the corresponding oxygen-water separator or hydrogen-water separator for further processing according to the type of separated gas. The present invention realizes the compact setting of the gas-liquid separation system equipment, reduces the equipment cost, and improves the working reliability of the gas-liquid separation system.

Description

Technical Field

[0001] The invention relates to the technical field of hydrogen production by electrolysis of water, and in particular to a gas-liquid separation method of a gas-liquid separation system of a hydrogen production device by electrolysis. Background Art

[0002] As an energy storage medium, hydrogen has the characteristics of high energy density and cleanness and is the key to solving the energy crisis and the green and low-carbon transformation of the energy structure. The basic principle of hydrogen production by water electrolysis is to use electricity to decompose water molecules into hydrogen and oxygen. The whole process does not produce harmful substances, and the raw water resources are abundant and can be supplied almost infinitely. Using renewable energy (such as solar energy and wind energy) to produce hydrogen by water electrolysis can solve the problem of grid absorption and storage, while reducing carbon emissions. This not only realizes the green transformation of energy, but also promotes the absorption and storage of renewable energy.

[0003] After hydrogen is obtained by hydrogen electrolysis, some water is mixed in it, so a gas-liquid separation device is needed. However, the existing gas-liquid separation device first uses some cooling equipment to cool the water in the hydrogen, and then separates it by filtering equipment. Specifically, the gas cooling equipment and the gas-water separation filtering equipment are both separately set, resulting in a large space occupied by the equipment, and will reduce the working reliability of the gas-liquid separation system and increase the manufacturing cost of the equipment. Summary of the invention

[0004] In order to solve the above problems, the present invention proposes a gas-liquid separation method for a gas-liquid separation system of an electrolytic hydrogen production device, aiming to realize a compact setting of the gas-liquid separation system equipment, reduce equipment costs, and improve the working reliability of the gas-liquid separation system. The specific technical solution is as follows: A gas-liquid separation method of a gas-liquid separation system of an electrolytic hydrogen production device, the gas-liquid separation system comprising: a. Gas-liquid separation tank, used to receive and preliminarily separate the gas-liquid mixture; b. A gas cooler connected to the gas-liquid separation tank by a pipe for cooling the gas flowing out of the gas-liquid separation tank; c. A gas-water separator, disposed in the upper part of the gas cooler, for further separating the water in the cooled gas; d. an oxygen-water separator for separating and recovering an aqueous solution containing oxygen; e. a hydrogen-water separator for separating and recovering an aqueous solution containing hydrogen; The gas-liquid separation method is as follows: the gas-liquid mixture enters the gas cooler after preliminary water removal in the gas-liquid separation tank, is cooled from bottom to top, and then flows into the small gas-water separator for separation. The separated liquid flows out from the condensate outlet below the gas cooler, and the gas flows out from the gas outlet above the gas cooler; and enters the corresponding oxygen-water separator or hydrogen-water separator for further processing according to the type of separated gas.

[0005] Specifically, the type of the separated gas is oxygen or hydrogen; the gas-liquid separation tank can be a gas-liquid separation tank for separating oxygen, or a gas-liquid separation tank for separating hydrogen; when the gas flowing out from the gas outlet above the gas cooler is oxygen, it enters the oxygen-water separator for further processing; when the gas flowing out from the gas outlet above the gas cooler is hydrogen, it enters the hydrogen-water separator for further processing.

[0006] In the present invention, a cooling medium channel is provided inside the gas cooler for cooling the gas by means of the cooling medium.

[0007] In the present invention, a gas-water separation element is arranged inside the small gas-water separator to improve the efficiency of gas-water separation.

[0008] In the present invention, the oxygen-water separator and the hydrogen-water separator are both provided with selective permeable membranes for respectively recovering aqueous solutions containing oxygen and hydrogen.

[0009] In the present invention, the gas-liquid separation system further comprises a control system for monitoring and adjusting the working state of each component to ensure stable operation of the system.

[0010] As a further improvement of the present invention, the gas cooler includes a tank body, sealing plates arranged at both ends of the tank body, a number of cooling water pipes connected between the sealing plates at both ends of the tank body and arranged at intervals, a first cover and a second cover respectively arranged on the outside of the sealing plates at both ends of the tank body, and a partition plate arranged in the first cover, the partition plate divides the internal space of the first cover into a cold water inlet chamber and a cold water outlet chamber, and the first cover is also respectively provided with a cold water inlet connected to the cold water inlet chamber and a cold water outlet connected to the cold water outlet chamber; the cooling water pipes are divided into two groups, one group of cooling water pipes is used as gas cooling cooling water pipes for gas cooling in the gas cooler, and the other group of cooling water pipes is used as gas-water separation cooling water pipes for gas-water separation in the gas-water separator.

[0011] Among them, one end of the cooling water pipe for gas cooling is connected to the cold water inlet chamber, and the other end is connected to the internal flow water chamber of the second cover; one end of the cooling water pipe for gas-water separation is connected to the cold water outlet chamber, and the other end is connected to the internal flow water chamber of the second cover.

[0012] The above-mentioned cold water inlet chamber, cooling water pipe for gas cooling, internal flow water chamber, cooling water pipe for gas-water separation and cold water outlet chamber are connected in sequence, thereby forming a cooling medium channel inside the gas cooler; the cooling water pipe for gas-water separation constitutes the gas-water separation element of the small gas-water separator.

[0013] Preferably, the tank body is arranged horizontally and inclined at a certain angle relative to the horizontal direction, the first cover cover is arranged at the high end position of the inclined tank body, and the second cover cover is arranged at the low end position of the inclined tank body; the tank body is respectively provided with a gas inlet and a gas outlet, the gas inlet is arranged at the lower side position of the tank body close to the high end position, and the gas outlet is arranged at the upper side position of the tank body close to the low end position.

[0014] Preferably, the tank body is arranged transversely and inclined at 5 to 20 degrees relative to the horizontal direction.

[0015] Preferably, a liquid storage bag connected to the internal space of the tank body is arranged at the lower part of the tank body, and the condensate outlet is arranged at the lower end of the liquid storage bag.

[0016] Wherein, a valve is arranged on the condensate outlet.

[0017] Preferably, the gas outlet on the tank body and the liquid storage bag on the tank body are arranged in upper and lower positions; and a gas outlet pipeline is connected to the gas outlet.

[0018] As a further improvement of the present invention, the gas-water separator also includes a wire mesh demister for further improving the water removal effect, the wire mesh demister includes a wire mesh assembly arranged inside the tank body and located below the gas outlet of the tank body, the wire mesh assembly includes a wire mesh frame and a wire mesh arranged on the wire mesh frame.

[0019] Preferably, the wire mesh in the wire mesh assembly is a multi-layer laminated wire mesh formed by stacking several layers of wire mesh.

[0020] The working principle of the above-mentioned gas-liquid separation system with built-in wire mesh demister is as follows: The gas-liquid mixture enters the gas cooler after preliminary water removal in the gas-liquid separation tank, is cooled from bottom to top, and then flows into a small gas-water separator for separation. The separated liquid passes through a wire mesh demister to further filter and adjust finer droplets, and then flows out from the condensate outlet below the gas cooler, while the gas flows out from the gas outlet above the gas cooler; and according to the type of separated gas, it enters the corresponding oxygen-water separator or hydrogen-water separator for further processing.

[0021] Taking into account factors such as changes in air flow velocity, the wire mesh demister may retain too much water after working for a period of time, which will reduce its performance in intercepting water droplets. In order to restore its performance in time, the wire mesh demister also includes a wire mesh intermittent shaker arranged on the tank body to prevent the wire mesh of the wire mesh assembly from overloading the water collection amount. The wire mesh intermittent shaker includes four suspension shafts erected at the four corners of the wire mesh frame in the up and down directions, four suspension holes opened on the tank body, an elastic seat ring arranged on the outer wall of the tank and located outside the suspension hole, a support plate arranged at the upper end of the elastic seat ring, an ultrasonic vibrator arranged at the upper end of the support plate, and a tension sensor arranged at the lower end of the support plate for online measuring the water collection weight of the wire mesh assembly. The suspension shaft on the wire mesh frame passes through the suspension hole on the tank body and is connected to the tension sensor.

[0022] In the present invention, the ultrasonic vibrator is connected to an ultrasonic generator, and the ultrasonic generator and the tension sensor are respectively connected to a control system.

[0023] The above-mentioned wire mesh intermittent shaker adopts an intermittent working mode. It is only turned on for a short time when the water collection weight inside the wire mesh component (the amount of water retained in the wire mesh) reaches or exceeds the set value, resulting in a decrease in its water drop interception effect. Its working principle is to drive the wire mesh component to ultrasonic vibration through an ultrasonic vibrator, so that most of the water droplets in the wire mesh are shaken off by the ultrasonic vibration, and a small part of the water droplets are atomized by the ultrasonic vibration, thereby quickly restoring its efficient water drop interception function. Among them, the change in the amount of water retained in the wire mesh is measured by a tension sensor.

[0024] As a preferred solution of the wire mesh assembly in the present invention, the multi-layer laminated wire mesh is connected to the wire mesh frame to form a tile shape as a whole, and flexible corrugated baffles that gently contact the upper inner wall of the tank body are arranged at the four border positions of the wire mesh frame.

[0025] In order to increase the flow area of ​​the wire mesh, one end of the tile-shaped wire mesh assembly extends to a high end position close to the inside of the tank body, and the other end extends to a low end position close to the inside of the tank body, thereby forming a large-area wire mesh water collection layer.

[0026] Considering that a small portion of water droplets retained on the screen will be atomized when the screen assembly is ultrasonically vibrated, in order to reduce or eliminate the overflow of atomized gas in a short period of time, an umbrella-shaped mist collecting hood is provided at the inner center of the joint between the gas outlet pipeline and the gas outlet of the tank body, and an atomized gas recovery bypass pipe extending to the outside is provided on the top of the umbrella-shaped mist collecting hood, the atomized gas recovery bypass pipe is connected to the liquid storage bag and communicated with the internal upper space of the liquid storage bag, and an air pump for forming a negative pressure in the umbrella-shaped mist collecting hood is provided on the atomized gas recovery bypass pipe. The atomized gas can be recovered to the upper space inside the liquid storage bag through the air pump.

[0027] Note that the air pump on the atomizing gas recovery bypass pipe also adopts an intermittent working mode, which is turned on and off synchronously with the ultrasonic vibrator.

[0028] The beneficial effects of the present invention are: First, a gas-liquid separation method of a gas-liquid separation system of an electrolytic hydrogen production device of the present invention can better reduce the gas-liquid temperature and realize the compact setting of the gas-liquid separation system equipment by directly integrating the gas-water separator into the gas cooler, thereby reducing the equipment cost and improving the working reliability of the gas-liquid separation system.

[0029] Second, a gas-liquid separation method of a gas-liquid separation system of an electrolytic hydrogen production device of the present invention can separate finer droplets in the gas and liquid by directly building a wire mesh demister into a gas cooler, thereby further improving the gas-liquid separation effect of the gas-liquid separation system; by setting a wire mesh intermittent shaker on the wire mesh demister, the wire mesh component can always be in the optimal working state, thereby further improving the gas-liquid separation effect. In addition, the built-in wire mesh component adopts a tile-shaped structure, which can be fully expanded and extended in the front, back, left and right directions in the tank body, thereby obtaining a larger interception area, thereby greatly reducing the resistance of the airflow, and further improving the efficiency of gas-liquid separation and the working reliability of gas-liquid separation. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of a gas-liquid separation system of an electrolytic hydrogen production device used in the gas-liquid separation method of the present invention; Figure 2 is Figure 1 A schematic diagram of a structure further improved on the basis of; Figure 3 yes Figure 2 A partial enlarged view of the left part; Figure 4 yes Figure 2 A partial enlarged view of the right part; Figure 5 yes Figure 2Schematic cross-section of the wire mesh assembly.

[0031] In the figure: 1. gas cooler, 2. gas-water separator, 3. tank body, 4. sealing plate, 5. first cover, 6. second cover, 7. partition plate, 8. cold water inlet chamber, 9. cold water outlet chamber, 10. cold water inlet, 11. cold water outlet, 12. cooling water pipe for gas cooling, 13. cooling water pipe for gas-water separation, 14. internal flow water chamber of the second cover, 15. gas inlet, 16. gas outlet, 17. liquid storage bag, 18. gas outlet pipeline, 19. condensate outlet.

[0032] In the figure: 20, wire mesh demister, 21, wire mesh assembly, 22, wire mesh frame, 23, wire mesh, 24, wire mesh intermittent shaker, 25, suspension shaft, 26, suspension hole, 27, elastic seat ring, 28, support plate, 29, ultrasonic vibrator, 30, tension sensor, 31, tile shape, 32, flexible corrugated baffle, 33, umbrella-shaped mist collector, 34, atomized gas recovery bypass pipe, 35, air pump. DETAILED DESCRIPTION

[0033] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0034] like Figures 1 to 5 The figure shows an embodiment of a gas-liquid separation method of a gas-liquid separation system of an electrolytic hydrogen production device of the present invention, wherein the gas-liquid separation system comprises: a. A gas-liquid separation tank (not shown) for receiving and preliminarily separating the gas-liquid mixture; b. A gas cooler 1 connected to the gas-liquid separation tank by a pipe for cooling the gas flowing out of the gas-liquid separation tank; c. A gas-water separator 2, disposed in the upper part of the gas cooler 1, for further separating the water in the cooled gas; d. an oxygen-water separator (not shown) for separating and recovering an aqueous solution containing oxygen; e. a hydrogen-water separator (not shown) for separating and recovering an aqueous solution containing hydrogen; The gas-liquid separation method is as follows: the gas-liquid mixture enters the gas cooler 1 after preliminary water removal in the gas-liquid separation tank, is cooled from bottom to top, and then flows into the small gas-water separator 2 for separation. The separated liquid flows out from the condensate outlet 19 below the gas cooler 1, and the gas flows out from the gas outlet 16 above the gas cooler 1; and enters the corresponding oxygen-water separator or hydrogen-water separator for further processing according to the type of separated gas.

[0035] Specifically, the type of the separated gas is oxygen or hydrogen; the gas-liquid separation tank can be a gas-liquid separation tank for separating oxygen, or a gas-liquid separation tank for separating hydrogen; when the gas flowing out from the gas outlet 16 on the gas cooler 1 is oxygen, it enters the oxygen-water separator for further processing; when the gas flowing out from the gas outlet 16 on the gas cooler 1 is hydrogen, it enters the hydrogen-water separator for further processing.

[0036] In this embodiment, a cooling medium channel is provided inside the gas cooler 1 for cooling the gas by means of a cooling medium.

[0037] In this embodiment, a gas-water separation element is provided inside the small gas-water separator 2 to improve the efficiency of gas-water separation.

[0038] In this embodiment, the oxygen-water separator and the hydrogen-water separator are both provided with selective permeable membranes for respectively recovering aqueous solutions containing oxygen and hydrogen.

[0039] In this embodiment, the gas-liquid separation system further includes a control system for monitoring and adjusting the working status of each component to ensure stable operation of the system.

[0040] As a further improvement of this embodiment, the gas cooler 1 includes a tank body 3, sealing plates 4 arranged at both ends of the tank body 3, a number of cooling water pipes 12 and 13 connected between the sealing plates 4 at both ends of the tank body 3 and arranged at intervals, a first cover 5 and a second cover 6 respectively arranged on the outside of the sealing plates 4 at both ends of the tank body 3, and a partition plate 7 arranged in the first cover 5, the partition plate 7 divides the internal space of the first cover 5 into a cold water inlet chamber 8 and a cold water outlet chamber 9, and the first cover 5 is also respectively provided with a cold water inlet 10 connected to the cold water inlet chamber 8 and a cold water outlet 11 connected to the cold water outlet chamber 9; the cooling water pipes 12 and 13 are divided into two groups, one group of cooling water pipes 12 is used as the gas cooling cooling water pipes 12 for gas cooling in the gas cooler 1, and the other group of cooling water pipes 13 is used as the gas-water separation cooling water pipes 13 for gas-water separation in the gas-water separator 2.

[0041] Among them, one end of the cooling water pipe 12 for gas cooling is connected to the cold water inlet chamber 8, and the other end is connected to the internal water flow chamber 14 of the second cover 6; one end of the cooling water pipe 13 for gas-water separation is connected to the cold water outlet chamber 9, and the other end is connected to the internal water flow chamber 14 of the second cover 2.

[0042] The above-mentioned cold water inlet chamber 8, the cooling water pipe 12 for gas cooling, the internal flow water chamber 14, the cooling water pipe 13 for gas-water separation and the cold water outlet chamber 9 are connected in sequence, thereby forming a cooling medium channel inside the gas cooler 1; the cooling water pipe 13 for gas-water separation constitutes the gas-water separation element of the small gas-water separator 2.

[0043] Preferably, the tank body 3 is arranged horizontally and inclined at a certain angle relative to the horizontal direction, the first cover 5 is arranged at the high end position of the inclined tank body 3, and the second cover 6 is arranged at the low end position of the inclined tank body 3; the tank body 3 is respectively provided with a gas inlet 15 and a gas outlet 16, the gas inlet 15 is arranged at the lower side position of the tank body 3 close to the high end position, and the gas outlet 16 is arranged at the upper side position of the tank body 3 close to the low end position.

[0044] Preferably, the tank body 3 is arranged transversely and inclined at 5 to 20 degrees relative to the horizontal direction.

[0045] Preferably, a liquid storage bag 17 connected to the internal space of the tank body 3 is provided at the lower part of the tank body 3 , and the condensate outlet 19 is provided at the lower end of the liquid storage bag 17 .

[0046] Wherein, the condensate outlet 19 is provided with a valve (not shown in the figure).

[0047] Preferably, the gas outlet 16 on the tank body 3 and the liquid storage bag 17 on the tank body 3 are arranged in upper and lower positions; and a gas outlet pipeline 18 is connected to the gas outlet 16 .

[0048] As a further improvement of this embodiment, the gas-water separator 2 also includes a wire mesh demister 20 for further improving the dewatering effect. The wire mesh demister 20 includes a wire mesh assembly 21 arranged inside the tank body 3 and located below the gas outlet 16 of the tank body 3. The wire mesh assembly 21 includes a wire mesh frame 22 and a wire mesh 23 arranged on the wire mesh frame 22.

[0049] Preferably, the wire mesh 23 in the wire mesh assembly 22 is a multi-layer laminated wire mesh formed by stacking several layers of wire mesh.

[0050] The working principle of the above-mentioned gas-liquid separation system with built-in wire mesh demister 20 is as follows: The gas-liquid mixture enters the gas cooler 1 after preliminary water removal in the gas-liquid separation tank, is cooled from bottom to top, and then flows into the small gas-water separator 2 for separation. The separated liquid passes through the wire mesh demister 20 to further filter and adjust the finer droplets, and then flows out from the condensate outlet 19 below the gas cooler 1, while the gas flows out from the gas outlet 16 above the gas cooler 1; and enters the corresponding oxygen-water separator or hydrogen-water separator for further processing according to the type of separated gas.

[0051] Taking into account factors such as changes in air flow velocity, the wire mesh demister 20 may retain too much water in its wire mesh 23 after working for a period of time, which will reduce its performance in intercepting water droplets. In order to restore its performance in time, the wire mesh demister 20 also includes a wire mesh intermittent shaker 24 arranged on the tank body 3 to prevent the wire mesh of the wire mesh assembly 21 from overloading. The wire mesh intermittent shaker 24 includes four suspension shafts 25 vertically arranged at the four corners of the wire mesh frame 22 in the up and down directions, four suspension holes 26 opened on the tank body 3, an elastic seat ring 27 arranged on the outer wall of the tank body 3 and located outside the suspension hole 26, a support plate 28 arranged at the upper end of the elastic seat ring 27, an ultrasonic vibrator 29 arranged at the upper end of the support plate 28, and a tension sensor 30 arranged at the lower end of the support plate 28 for online measuring the water collection weight of the wire mesh assembly 21. The suspension shaft 25 on the wire mesh frame 22 passes through the suspension hole 26 on the tank body 3 and is connected to the tension sensor 30.

[0052] In this embodiment, the ultrasonic vibrator 29 is connected to an ultrasonic generator, and the ultrasonic generator and the tension sensor 30 are respectively connected to a control system.

[0053] The above-mentioned screen intermittent shaker 24 adopts an intermittent working mode. It is only turned on for a short time when the water collection weight inside the screen assembly 21 (the amount of water retained in the screen) reaches or exceeds the set value, resulting in a decrease in its water drop interception effect. Its working principle is to drive the screen assembly 21 to ultrasonically vibrate through the ultrasonic vibrator 29, so that most of the water droplets in the screen 23 are shaken off by the ultrasonic vibration, and a small part of the water droplets are atomized by the ultrasonic vibration, thereby quickly restoring its efficient water drop interception function. Among them, the change in the amount of water retained in the screen 23 is measured by the tension sensor 30.

[0054] As a preferred solution for the wire mesh assembly in this embodiment, the multi-layer laminated wire mesh 23 is connected to the wire mesh frame 22 to form a tile shape 31 as a whole, and flexible corrugated baffles 32 that gently contact the upper inner wall of the tank body 3 are arranged at the four border positions of the wire mesh frame 22.

[0055] In order to increase the flow area of ​​the wire mesh 23, one end of the tile-shaped wire mesh assembly 21 extends to a high end position close to the inside of the tank body 3, and the other end extends to a low end position close to the inside of the tank body 3, thereby forming a large-area wire mesh water collection layer.

[0056] Considering that a small portion of water droplets retained on the wire mesh 23 will be atomized when the wire mesh assembly 21 is ultrasonically vibrated, in order to reduce or eliminate the overflow of atomized gas in a short period of time, an umbrella-shaped mist collecting hood 33 is provided at the inner center of the joint between the gas outlet pipeline 18 and the gas outlet 16 of the tank body 3, and an atomized gas recovery bypass pipe 34 extending to the outside is provided on the top of the umbrella-shaped mist collecting hood 33, the atomized gas recovery bypass pipe 34 is connected to the liquid storage bag 17 and communicates with the internal upper space of the liquid storage bag 17, and an air pump 35 for forming a negative pressure in the umbrella-shaped mist collecting hood 33 is provided on the atomized gas recovery bypass pipe 34. The atomized gas can be recovered to the upper space inside the liquid storage bag 17 through the air pump 35.

[0057] Note that the air pump 35 on the atomizing gas recovery bypass pipe 34 also adopts an intermittent working mode, and is turned on and off synchronously with the ultrasonic vibrator 29.

[0058] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A gas-liquid separation method for a gas-liquid separation system of an electrolytic hydrogen production device, characterized in that: The gas-liquid separation system comprises: a. Gas-liquid separation tank, used to receive and preliminarily separate the gas-liquid mixture; b. A gas cooler connected to the gas-liquid separation tank by a pipe for cooling the gas flowing out of the gas-liquid separation tank; c. A gas-water separator, disposed in the upper part of the gas cooler, for further separating the water in the cooled gas; d. an oxygen-water separator for separating and recovering an aqueous solution containing oxygen; e. a hydrogen-water separator for separating and recovering an aqueous solution containing hydrogen; The gas-liquid separation method is as follows: the gas-liquid mixture enters the gas cooler after preliminary water removal in the gas-liquid separation tank, is cooled from bottom to top, and then flows into the small gas-water separator for separation. The separated liquid flows out from the condensate outlet below the gas cooler, and the gas flows out from the gas outlet above the gas cooler; and enters the corresponding oxygen-water separator or hydrogen-water separator for further processing according to the type of separated gas.

2. The gas-liquid separation method of the gas-liquid separation system of the electrolytic hydrogen production device according to claim 1, characterized in that: The gas cooler is provided with a cooling medium channel inside for cooling the gas through the cooling medium.

3. The gas-liquid separation method of the gas-liquid separation system of the electrolytic hydrogen production device according to claim 1, characterized in that: The small-sized gas-water separator is provided with a gas-water separation element inside to improve the efficiency of gas-water separation.

4. The gas-liquid separation method of the gas-liquid separation system of the electrolytic hydrogen production device according to claim 1, characterized in that: The oxygen-water separator and the hydrogen-water separator are both provided with selective permeable membranes for respectively recovering aqueous solutions containing oxygen and hydrogen.

5. The gas-liquid separation method of the gas-liquid separation system of the electrolytic hydrogen production device according to claim 1, characterized in that: The gas cooler includes a tank body, sealing plates arranged at both ends of the tank body, a number of cooling water pipes connected between the sealing plates at both ends of the tank body and arranged at intervals, a first cover and a second cover respectively arranged on the outside of the sealing plates at both ends of the tank body, and a partition plate arranged in the first cover, wherein the partition plate divides the internal space of the first cover into a cold water inlet chamber and a cold water outlet chamber, and the first cover is also respectively provided with a cold water inlet connected to the cold water inlet chamber and a cold water outlet connected to the cold water outlet chamber; the cooling water pipes are divided into two groups, one group of cooling water pipes is used as the gas cooling cooling water pipes for gas cooling in the gas cooler, and the other group of cooling water pipes is used as the gas-water separation cooling water pipes for gas-water separation in the gas-water separator.

6. The gas-liquid separation method of the gas-liquid separation system of the electrolytic hydrogen production device according to claim 5, characterized in that: One end of the cooling water pipe for gas cooling is connected to the cold water inlet chamber, and the other end is connected to the internal flow water chamber of the second cover; one end of the cooling water pipe for gas-water separation is connected to the cold water outlet chamber, and the other end is connected to the internal flow water chamber of the second cover.

7. The gas-liquid separation method of the gas-liquid separation system of the electrolytic hydrogen production device according to claim 6, characterized in that: The tank body is arranged transversely and inclined at a certain angle relative to the horizontal direction, the first cover cover is arranged at the high end position of the inclined tank body, and the second cover cover is arranged at the low end position of the inclined tank body; a gas inlet and a gas outlet are respectively arranged on the tank body, the gas inlet is arranged at the lower side position of the tank body close to the high end position, and the gas outlet is arranged at the upper side position of the tank body close to the low end position.

8. The gas-liquid separation method of the gas-liquid separation system of the electrolytic hydrogen production device according to claim 7, characterized in that: A liquid storage bag connected to the inner space of the tank body is arranged at the lower part of the tank body, and the condensate outlet is arranged at the lower end of the liquid storage bag.

9. The gas-liquid separation method of the gas-liquid separation system of the electrolytic hydrogen production device according to claim 8, characterized in that: The gas outlet on the tank body and the liquid storage bag on the tank body are arranged in upper and lower positions; and a gas outlet pipeline is connected to the gas outlet.

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