Three-stage gas-liquid separator for producing hydrogen by electrolyzing water

Abstract

The utility model discloses a three-stage gas-liquid separator for producing hydrogen by electrolyzing water. The three-stage gas-liquid separator comprises a gas-liquid fluid inlet U-shaped spray pipe (1), a gas-liquid separation tank body (4) and a gas cooler (23) from upstream to downstream, the gas-liquid fluid inlet U-shaped spray pipe (1) is connected into the gas-liquid separation tank body (4); a gas-liquid mixture enters through the U-shaped spray pipe inlet (24) and is subjected to three-stage separation through the gas-liquid fluid inlet U-shaped spray pipe (1), the gas-liquid separation tank body (4) and the gas cooler (23), and gas subjected to three-stage separation flows out through the gas outlet (15). According to the horizontal gas-liquid separator, two stages of separation devices are additionally arranged at the inlet and the outlet of the horizontal gas-liquid separator, so that three-stage separation of a gas-liquid mixture is realized, the gas-liquid separation efficiency is improved, the gas purity is improved, and the water content of product gas is reduced.

Description

Technical Field

[0001] The utility model relates to a three-stage gas-liquid separator for producing hydrogen by electrolysis of water, which is particularly suitable for separating a gas-liquid mixture of hydrogen or oxygen produced by electrolysis of an electrolyzer in a water electrolysis hydrogen production device, achieving efficient gas-liquid separation and reducing the water content in the product gas. Background Art

[0002] The main function of the gas separator of the water electrolysis equipment is to separate the gas-liquid mixture of hydrogen or oxygen produced by electrolysis in the electrolyzer into gas and liquid. The gas is collected as the product, and the liquid flows back to the electrolytic hydrogen production system. The traditional horizontal gas-liquid separator adopts a simple gravity separation principle. The gas is lighter than the liquid. The gas flows out from the top of the gas-liquid separation tank, and the liquid flows into the bottom of the gas-liquid separator and returns to the system circulation. However, the separation efficiency of this separator is low, resulting in a higher water content in the product gas, which increases the subsequent purification cost.

[0003] By adding the proposed separation device at the gas-liquid mixture inlet and gas outlet of the horizontal gas-liquid separator, the gas-liquid mixture is separated into three stages, efficient gas-liquid separation is achieved, the water content of the product gas is reduced, the subsequent purification cost is reduced, and the economic benefit is increased.

[0004] In order to solve the above problems, the present utility model is proposed. Utility Model Content

[0005] In order to solve the problems of insufficient separation efficiency and high water content of product gas of the traditional horizontal gas-liquid separator used in water electrolysis hydrogen production equipment, and to achieve efficient gas-liquid separation and reduce the water content of product gas, the utility model designs a three-stage gas-liquid separator for water electrolysis hydrogen production.

[0006] The utility model designs a three-stage gas-liquid separator for electrolysis of water to produce hydrogen, which mainly includes a first-stage separation tube, a second-stage separation shell, a shell internal coating, a third-stage separation tube, a third-stage separation condenser, etc. Its technical scheme is: the gas-liquid mixture produced by the electrolytic cell for electrolysis of water to produce hydrogen enters the gas-liquid separator through a section of U-shaped tube, the tube wall of the U-shaped tube has small holes, the inner wall has a hydrophilic filter, and the gas-liquid mixture completes the first-stage separation in the U-shaped tube; the gas-liquid mixture enters the tank body for gravity separation, and the tank body is provided with a hydrophobic lining to improve the separation efficiency and complete the second-stage separation; after the gas-liquid mixture enters the condenser, the outer tube of the condenser is provided with circulating cooling water, the inner tube is provided with a spoiler, and the top is provided with a wire mesh catcher to improve the separation efficiency, and the remaining liquid will condense and return to the tank body. The utility model uses three-stage separation, and a small separation device is provided before and after entering the tank body to improve the gas-liquid separation efficiency and reduce the water content of the product gas.

[0007] The utility model provides a three-stage gas-liquid separator for producing hydrogen by electrolysis of water, which comprises, from upstream to downstream, a gas-liquid fluid inlet U-shaped nozzle 1, a gas-liquid separation tank body 4 and a gas cooler 23; the gas-liquid fluid inlet U-shaped nozzle 1 is connected to the gas-liquid separation tank body 4;

[0008] The U-shaped nozzle 1 for gas-liquid fluid inlet has dense nozzle holes 2 on its wall, and a hydrophilic filter 3 is provided on the inner side of the nozzle wall. The upstream of the U-shaped nozzle 1 for gas-liquid fluid inlet is a U-shaped nozzle inlet 24, and the downstream is a U-shaped nozzle outlet 25.

[0009] The inner wall of the gas-liquid separation tank body 4 is provided with a hydrophobic and air-philic coating 5, and the bottom of the gas-liquid separation tank body 4 is a liquid area 22 formed by accommodating liquid;

[0010] The gas cooler 23 includes a gas cooler shell side 8 and a gas cooler tube side 10, the gas cooler tube side 10 includes a spoiler 9, the gas cooler shell side 8 is connected to a cooling water inlet 16 and a cooling water outlet 11, and a wire mesh catcher 13 and a wire mesh 14 are provided at the top of the gas cooler 23, and the gas outlet 15 is downstream of the wire mesh catcher 13; wherein the wire mesh catcher 13 is a container for the wire mesh 14.

[0011] The gas-liquid mixture enters through the U-shaped nozzle inlet 24 , undergoes three-stage separation through the gas-liquid fluid inlet U-shaped nozzle 1 , the gas-liquid separation tank 4 and the gas cooler 23 , and the gas after the three-stage separation flows out through the gas outlet 15 .

[0012] Preferably, the gas-liquid mixture enters through the U-shaped nozzle inlet 24, and the liquid in the gas-liquid mixture flows into the liquid area 22 through the nozzle hole 2, thereby achieving primary separation;

[0013] The gas-liquid mixture after the primary separation is sprayed out from the U-shaped nozzle outlet 25 and enters the gas-liquid separation tank 4. The liquid in the gas-liquid mixture after the primary separation falls into the liquid area 22 by gravity, thus achieving secondary separation.

[0014] The gas-liquid mixture after the secondary separation is discharged through the gas outlet 17 of the gas-liquid separator and enters the gas cooler tube side 10 of the gas cooler 23. The cooling water circulates in the gas cooler shell side 8 through the cooling water inlet 16 and the cooling water outlet 11 to cool the gas. The wire mesh catcher 13 at the top of the gas cooler 23 cools and captures the liquid in the gas, and the captured liquid flows back into the liquid area 22. The gas flows out through the gas outlet 15 to achieve three-stage separation.

[0015] The upstream and downstream are defined by the movement direction of the gas-liquid mixture. The gas-liquid mixture enters the three-stage gas-liquid separator from the upstream, and the gas is discharged from the downstream after separation.

[0016] The utility model reduces the water content of the product gas and improves the purity of the product gas through three-stage separation.

[0017] Preferably, the gas-liquid separation tank body 4 has an upper interface 6 and a lower interface 21 of the differential pressure transmitter, and the upper interface 6 and the lower interface 21 of the differential pressure transmitter are connected to the differential pressure transmitter for detecting the gas-liquid pressure differential of the gas-liquid separation tank body 4.

[0018] Preferably, the bottom of the gas-liquid separation tank body 4 is provided with a gas-liquid separator liquid outlet 20 , and the liquid in the liquid area 22 flows out through the gas-liquid separator liquid outlet 20 .

[0019] Preferably, a gas cooler lower flange 7 is provided at the connection between the gas cooler 23 and the gas-liquid separation tank body 4 , and the gas-liquid mixture after the secondary separation enters the gas cooler pipe 10 through the gas cooler lower flange 7 .

[0020] Preferably, the top of the gas cooler 23 is provided with a gas cooler upper flange 12 . The gas cooler upper flange 12 is connected to the wire mesh catcher 13 .

[0021] Preferably, the gas-liquid separation tank body 4 is provided with a liquid level gauge connection flange 18. The liquid level gauge connection flange 18 is used to install an external liquid level gauge and is an essential component of the gas-liquid separator.

[0022] Preferably, the hydrophilic filter 3 is made of a material with good gas barrier properties; and the hydrophobic and gas-philic coating 5 is made of a polytetrafluoroethylene coating.

[0023] Preferably, the three-stage gas-liquid separator is used to separate a mixture of hydrogen and water, or a mixture of oxygen and water produced by the water electrolysis hydrogen production equipment to obtain high-purity, low-water-content hydrogen or oxygen.

[0024] Preferably, the three-stage gas-liquid separator is fixed on the frame of the water electrolysis hydrogen production equipment through a saddle 19 .

[0025] Compared with the prior art, the utility model has the following beneficial effects:

[0026] 1. The utility model realizes three-stage separation of gas-liquid mixture by adding two-stage separation devices to the inlet and outlet of the horizontal gas-liquid separator, thereby improving the gas-liquid separation efficiency, improving the gas purity and reducing the water content of the product gas.

[0027] 2. The U-shaped design of the U-shaped nozzle at the gas-liquid fluid inlet can extend the flow path of the gas-liquid mixture, making the gas inlet as far away from the gas outlet as possible, thereby improving the separation efficiency.

[0028] 3. The gas cooler tube contains spoilers, and cooling water is circulated through the cooling water inlet and cooling water outlet in the gas cooler shell to cool down the gas. The cooled gas passes through the wire mesh catcher at the top to remove liquid again, further improving the separation efficiency.

[0029] 4. The utility model has low design and manufacturing cost, can improve separation efficiency, reduce gas water content, save gas purification cost, and improve economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the structure of a three-stage gas-liquid separator for producing hydrogen by electrolyzing water in the utility model;

[0031] Figure 2 This is a schematic diagram of the structure of a U-shaped nozzle at the gas-liquid fluid inlet of a three-stage gas-liquid separator for producing hydrogen by electrolysis of water in the utility model;

[0032] Figure 3 The utility model is a three-stage gas-liquid separator for electrolyzing water to produce hydrogen, and the gas-liquid fluid inlet U-shaped nozzle Figure 2 Cross-section of the middle AA surface;

[0033] Figure 4 This is a schematic diagram of the structure of a three-stage gas-liquid separator gas cooler for producing hydrogen by electrolysis of water in the utility model;

[0034] Figure 5 The utility model is a three-stage gas-liquid separator gas cooler for electrolyzing water to produce hydrogen Figure 4 Cross-section view of the middle BB surface.

[0035] The names of the figure marks in the figure description: 1-U-shaped nozzle for gas-liquid fluid inlet, 2-nozzle hole, 3-hydrophilic filter, 4-gas-liquid separation tank, 5-hydrophobic and air-philic coating, 6-upper interface of differential pressure transmitter, 7-lower flange of gas cooler, 8-shell side of gas cooler, 9-spoiler, 10-pipe side of gas cooler, 11-cooling water outlet, 12-upper flange of gas cooler, 13-wire mesh catcher, 14-wire mesh, 15-gas outlet, 16-cooling water inlet, 17-gas-liquid separator gas outlet, 18-liquid level gauge connecting flange, 19-saddle, 20-gas-liquid separator liquid outlet, 21-lower interface of differential pressure transmitter, 22-liquid area, 23-gas cooler, 24-U-shaped nozzle inlet, 25-U-shaped nozzle outlet. DETAILED DESCRIPTION

[0036] The utility model is further described in detail below in conjunction with the embodiments.

[0037] Those skilled in the art will understand that the following examples are only used to illustrate the present invention and should not be considered to limit the scope of the present invention. If no specific techniques or conditions are specified in the examples, the techniques or conditions described in the literature in the field or the product instructions are used. If the manufacturer of the materials or equipment used is not specified, they are all conventional products that can be purchased.

[0038] Those skilled in the art will appreciate that, unless expressly stated otherwise, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present utility model refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. It should be understood that when we refer to an element as being "connected" to another element, it may be directly connected to the other element, or there may be intermediate elements. In addition, the "connection" used here may include wireless connection.

[0039] In the description of the present invention, unless otherwise specified, "plurality" means two or more than two. The terms "inside", "upper", "lower", etc., indicating positions or state relationships, are based on the positions or state relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operate in a specific position, and therefore cannot be understood as limiting the present invention.

[0040] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "provided with" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention will be understood according to specific circumstances.

[0041] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein, including technical terms and scientific terms, have the same meaning as the general understanding of ordinary technicians in the field to which the utility model belongs. It should also be understood that those terms such as those defined in general dictionaries should be understood to have the same meaning as the meaning in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless defined as herein.

[0042] Example

[0043] This embodiment is a three-stage gas-liquid separator for producing hydrogen by electrolysis of water, which includes, from upstream to downstream, a gas-liquid fluid inlet U-shaped nozzle 1, a gas-liquid separation tank body 4 and a gas cooler 23; the gas-liquid fluid inlet U-shaped nozzle 1 is connected to the gas-liquid separation tank body 4;

[0044] The U-shaped nozzle 1 for gas-liquid fluid inlet has dense nozzle holes 2 on its wall, and a hydrophilic filter 3 is provided on the inner side of the nozzle wall. The upstream of the U-shaped nozzle 1 for gas-liquid fluid inlet is a U-shaped nozzle inlet 24, and the downstream is a U-shaped nozzle outlet 25.

[0045] The inner wall of the gas-liquid separation tank body 4 is provided with a hydrophobic and air-philic coating 5, and the bottom of the gas-liquid separation tank body 4 is a liquid area 22 formed by accommodating liquid;

[0046] The gas cooler 23 includes a gas cooler shell side 8 and a gas cooler tube side 10, the gas cooler tube side 10 includes a spoiler 9, the gas cooler shell side 8 is connected to a cooling water inlet 16 and a cooling water outlet 11, and a wire mesh catcher 13 and a wire mesh 14 are provided at the top of the gas cooler 23, and the gas outlet 15 is downstream of the wire mesh catcher 13; wherein the wire mesh catcher 13 is a container for the wire mesh 14.

[0047] The gas-liquid mixture enters through the U-shaped nozzle inlet 24 , undergoes three-stage separation through the gas-liquid fluid inlet U-shaped nozzle 1 , the gas-liquid separation tank 4 and the gas cooler 23 , and the gas after the three-stage separation flows out through the gas outlet 15 .

[0048] The gas-liquid mixture enters through the U-shaped nozzle inlet 24, and the liquid in the gas-liquid mixture flows into the liquid area 22 through the nozzle hole 2, achieving primary separation;

[0049] The gas-liquid mixture after the primary separation is sprayed out from the U-shaped nozzle outlet 25 and enters the gas-liquid separation tank 4. The liquid in the gas-liquid mixture after the primary separation falls into the liquid area 22 by gravity, thus achieving secondary separation.

[0050] The gas-liquid mixture after the secondary separation is discharged through the gas outlet 17 of the gas-liquid separator and enters the gas cooler tube side 10 of the gas cooler 23. The cooling water circulates in the gas cooler shell side 8 through the cooling water inlet 16 and the cooling water outlet 11 to cool the gas. The wire mesh catcher 13 at the top of the gas cooler 23 cools and captures the liquid in the gas, and the captured liquid flows back into the liquid area 22. The gas flows out through the gas outlet 15 to achieve three-stage separation.

[0051] The upstream and downstream are defined by the movement direction of the gas-liquid mixture. The gas-liquid mixture enters the three-stage gas-liquid separator from the upstream, and the gas is discharged from the downstream after separation.

[0052] The utility model reduces the water content of the product gas and improves the purity of the product gas through three-stage separation.

[0053] The gas-liquid separation tank body 4 is provided with an upper interface 6 of the differential pressure transmitter and a lower interface 21 of the differential pressure transmitter, and the upper interface 6 of the differential pressure transmitter and the lower interface 21 of the differential pressure transmitter are connected to the differential pressure transmitter for detecting the gas-liquid pressure differential of the gas-liquid separation tank body 4 .

[0054] The bottom of the gas-liquid separation tank body 4 is provided with a gas-liquid separator liquid outlet 20 , and the liquid in the liquid area 22 flows out through the gas-liquid separator liquid outlet 20 .

[0055] A gas cooler lower flange 7 is provided at the connection between the gas cooler 23 and the gas-liquid separation tank body 4 , and the gas-liquid mixture after secondary separation enters the gas cooler pipe 10 through the gas cooler lower flange 7 .

[0056] The top of the gas cooler 23 is provided with a gas cooler upper flange 12 . The gas cooler upper flange 12 is connected to the wire mesh catcher 13 .

[0057] The gas-liquid separation tank body 4 is provided with a liquid level meter connection flange 18. The liquid level meter connection flange 18 is used to install an external liquid level meter and is an essential component of the gas-liquid separator.

[0058] The hydrophilic filter 3 is made of a material with good gas barrier properties; the hydrophobic and gas-philic coating 5 is made of a polytetrafluoroethylene coating.

[0059] The three-stage gas-liquid separator is used to separate a mixture of hydrogen and water, or a mixture of oxygen and water, produced by a water electrolysis hydrogen production device to obtain high-purity hydrogen or oxygen with a low water content.

[0060] The three-stage gas-liquid separator is fixed on the frame of the water electrolysis hydrogen production equipment through a saddle 19 .

[0061] Specifically, Figure 1-Figure 5As shown, the utility model is a three-stage gas-liquid separator for electrolysis of water to produce hydrogen, and its structure mainly includes a U-shaped nozzle for gas-liquid fluid inlet, a nozzle hole, a hydrophilic filter, a gas-liquid separation tank, a hydrophobic and air-philic coating, an upper interface of a differential pressure transmitter, a lower flange of a gas cooler, a gas cooler shell, a spoiler, a gas cooler pipe, a cooling water outlet, an upper flange of a gas cooler, a wire mesh catcher, a wire mesh, a gas outlet, a cooling water inlet, a gas-liquid separator gas outlet, a liquid level gauge connecting flange, a saddle, a gas-liquid separator liquid outlet, a lower interface of a differential pressure transmitter, and a liquid area; its structural features are: the separator is fixed to the frame of the electrolysis of water to produce hydrogen equipment through the saddle, the upper interface of the differential pressure transmitter and the lower interface of the differential pressure transmitter are connected to the differential pressure transmitter for detecting the gas-liquid pressure differential of the gas-liquid separation tank; with a nozzle The U-shaped nozzle of the gas-liquid fluid inlet of the hole and the hydrophilic filter is connected to the gas-liquid separation tank body. After the gas-liquid mixture enters, the first-level separation can be completed in the secondary area. The gas-liquid mixture with low liquid content is sprayed out from the nozzle outlet, and part of the liquid flows into the liquid area from the nozzle hole and flows out through the liquid outlet of the gas-liquid separator; the gas-liquid mixture is provided with a hydrophobic and air-philic coating on the inner wall of the gas-liquid separation tank body, and relies on gravity to complete the secondary separation. The liquid enters the liquid area, and the gas enters the gas cooler pipe through the lower flange of the gas cooler. The pipe contains a spoiler, and the cooling water is circulated in the gas cooler shell through the cooling water inlet and cooling water outlet to cool the gas. A wire mesh catcher is provided at the top to cool and capture the liquid in the gas, and reflux it into the liquid area. The gas flows out through the gas outlet to achieve three-level separation. Through the three-level separation, the water content of the product gas is reduced and the purity of the product gas is improved.

[0062] The U-shaped nozzle pipe wall of the gas-liquid fluid inlet is provided with dense nozzle holes, and a hydrophilic filter is provided on the inner side of the pipe wall, and the filter is made of a material with good gas barrier performance; the inner wall of the gas-liquid separation tank is provided with a hydrophobic and gas-philic coating, and the coating is a polytetrafluoroethylene coating; the gas cooler pipe side includes a spoiler, and the gas cooler shell side is cooled by circulating cooling water through the cooling water inlet and cooling water outlet, and the cooled gas passes through the wire mesh catcher at the top to remove the liquid again; the gas-liquid separator can separate the mixture of hydrogen and water, or the mixture of oxygen and water produced by the water electrolysis hydrogen production equipment, to obtain hydrogen or oxygen with higher purity and lower water content.

[0063] The utility model realizes three-stage separation of gas-liquid mixture by adding two-stage separation devices to the inlet and outlet of the horizontal gas-liquid separator, thereby improving separation efficiency; the U-shaped nozzle design of the gas-liquid fluid inlet can make the gas inlet as far away from the gas outlet as possible, thereby improving separation efficiency; the utility model has low design and manufacturing cost, can improve separation efficiency, reduce gas water content, save gas purification cost, and improve economic benefits.

Claims

1. A three-stage gas-liquid separator for producing hydrogen by electrolysis of water, characterized in that: It comprises, from upstream to downstream, a gas-liquid fluid inlet U-shaped nozzle (1), a gas-liquid separation tank body (4) and a gas cooler (23); the gas-liquid fluid inlet U-shaped nozzle (1) is connected to the gas-liquid separation tank body (4); The U-shaped nozzle (1) for inlet of gas-liquid fluid has a nozzle hole (2) on its wall, and a hydrophilic filter (3) is provided on the inner side of the nozzle wall; the upstream of the U-shaped nozzle (1) for inlet of gas-liquid fluid is a U-shaped nozzle inlet (24), and the downstream is a U-shaped nozzle outlet (25); The inner wall of the gas-liquid separation tank body (4) is provided with a hydrophobic and air-philic coating (5), and the bottom of the gas-liquid separation tank body (4) is a liquid area (22) formed by accommodating liquid; The gas cooler (23) comprises a gas cooler shell side (8) and a gas cooler tube side (10), the gas cooler tube side (10) comprises a spoiler (9), the gas cooler shell side (8) is connected to a cooling water inlet (16) and a cooling water outlet (11), and a wire mesh catcher (13) and a wire mesh (14) are provided at the top of the gas cooler (23), and a gas outlet (15) is located downstream of the wire mesh catcher (13); The gas-liquid mixture enters through the U-shaped nozzle inlet (24), undergoes three-stage separation through the gas-liquid fluid inlet U-shaped nozzle (1), the gas-liquid separation tank (4) and the gas cooler (23), and the gas after the three-stage separation flows out through the gas outlet (15).

2. The three-stage gas-liquid separator according to claim 1, characterized in that: The gas-liquid mixture enters through the U-shaped nozzle inlet (24), and the liquid in the gas-liquid mixture flows into the liquid area (22) through the nozzle hole (2), thereby achieving primary separation; The gas-liquid mixture after the primary separation is sprayed out from the U-shaped nozzle outlet (25) and enters the gas-liquid separation tank (4), and the liquid in the gas-liquid mixture after the primary separation falls into the liquid area (22) by gravity, thereby achieving secondary separation; The gas-liquid mixture after the secondary separation is discharged through the gas outlet (17) of the gas-liquid separator and enters the gas cooler tube side (10) of the gas cooler (23). The cooling water circulates in the gas cooler shell side (8) through the cooling water inlet (16) and the cooling water outlet (11) to cool the gas. The wire mesh catcher (13) at the top of the gas cooler (23) cools and captures the liquid in the gas. The captured liquid flows back into the liquid area (22). The gas flows out through the gas outlet (15), thereby achieving the third-stage separation.

3. The three-stage gas-liquid separator according to claim 1, characterized in that: The gas-liquid separation tank body (4) is provided with an upper interface (6) of a differential pressure transmitter and a lower interface (21) of the differential pressure transmitter. The upper interface (6) of the differential pressure transmitter and the lower interface (21) of the differential pressure transmitter are connected to the differential pressure transmitter for detecting the gas-liquid pressure differential of the gas-liquid separation tank body (4).

4. The three-stage gas-liquid separator according to claim 1, characterized in that: The bottom of the gas-liquid separation tank body (4) is provided with a gas-liquid separator liquid outlet (20), and the liquid in the liquid area (22) flows out through the gas-liquid separator liquid outlet (20).

5. The three-stage gas-liquid separator according to claim 1, characterized in that: The gas cooler (23) is provided with a gas cooler lower flange (7) at the connection point with the gas-liquid separation tank body (4), and the gas-liquid mixture after the secondary separation enters the gas cooler pipe (10) through the gas cooler lower flange (7).

6. The three-stage gas-liquid separator according to claim 1, characterized in that: The top of the gas cooler (23) is provided with a gas cooler upper flange (12).

7. The three-stage gas-liquid separator according to claim 1, characterized in that: The gas-liquid separation tank body (4) is provided with a liquid level meter connecting flange (18).

8. The three-stage gas-liquid separator according to claim 1, characterized in that: The hydrophilic filter (3) is made of a material with good gas barrier properties; the hydrophobic and gas-philic coating (5) is made of a polytetrafluoroethylene coating.

9. The three-stage gas-liquid separator according to claim 1, characterized in that: The three-stage gas-liquid separator is fixed on the frame of the water electrolysis hydrogen production equipment via a saddle (19).

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