CN218232597U - Alkaline water electrolysis hydrogen production gas-liquid separation system and hydrogen production system - Google Patents

Abstract

The utility model belongs to the technical field of hydrogen manufacturing equipment, a hydrogen gas-liquid separation system and hydrogen manufacturing system are made to alkaline water electrolysis is disclosed. The alkaline water electrolysis hydrogen production gas-liquid separation system comprises a pipeline preseparator, a first spiral-flow type gas-liquid separator, a main separator and a second spiral-flow type gas-liquid separator, wherein the pipeline preseparator is used for carrying out preliminary gas-liquid separation on a gas-liquid mixture to be separated, then the first spiral-flow type gas-liquid separator is used for carrying out gas-liquid separation on the gas-liquid mixture after the preseparation again through the centrifugal force effect, gas separated twice enters a gas phase space of the main separator, most of liquid drops with large particle size are separated through gravity settling, and then the gas is output from the main separator, so that the efficiency of the gas-liquid separation is improved.

Description

Alkaline water electrolysis hydrogen production gas-liquid separation system and hydrogen production system

Technical Field

The utility model relates to a hydrogen manufacturing equipment technical field especially relates to a hydrogen manufacturing gas-liquid separation system and hydrogen manufacturing system of alkaline water electrolysis.

Background

The hydrogen is used as a clean and pollution-free energy with high heat value, and occupies a place in the new energy industry. Hydrogen production methods are various, and hydrogen production by water electrolysis is the most important technology for preparing high-purity hydrogen. In the water electrolysis hydrogen production technology, direct current is introduced into an electrolytic tank filled with potassium hydroxide, water molecules are subjected to electrochemical reaction on an electrode and are decomposed into hydrogen and oxygen, and the electrolyte, the hydrogen and the oxygen are separated from gas and liquid by a gas-liquid separator by utilizing the principle of different gas-liquid specific gravities, so that the hydrogen is obtained.

At present, gas-liquid separation in the hydrogen production industry adopts the traditional gravity settling principle to carry out gas-liquid separation, and although the gravity type gas-liquid separator has a simple structure and a wide application range, the equipment is huge and the separation efficiency is low.

Therefore, a gas-liquid separation system for hydrogen production by alkaline water electrolysis is needed to solve the problems in the prior art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an alkaline water electrolysis hydrogen manufacturing gas-liquid separation system has reduced the volume of equipment, has improved gas-liquid separation's efficiency.

To achieve the purpose, the utility model adopts the following technical proposal:

an alkaline water electrolysis hydrogen production gas-liquid separation system, comprising:

the main separator is provided with a first air inlet pipe and a first liquid inlet pipe;

the pipeline preseparator comprises a first air outlet and a first liquid outlet, the first air outlet is communicated with the first air inlet pipe, and the first liquid outlet is communicated with the first liquid inlet pipe;

first spiral-flow type vapour and liquid separator set up in the main separator, first spiral-flow type vapour and liquid separator with first feed liquor pipe intercommunication, first spiral-flow type vapour and liquid separator is configured to carry out gas-liquid separation with the gas-liquid mixture after preseparating, and the gas of separation enters into in the gas phase space of main separator, the liquid of separation enters into in the liquid phase space of main separator.

Optionally, the alkaline water electrolysis hydrogen production gas-liquid separation system further includes a second cyclone gas-liquid separator, the second cyclone gas-liquid separator is communicated with the gas phase space, the second cyclone gas-liquid separator is configured to perform gas-liquid separation on gas in the gas phase space, output the separated gas, and return the separated liquid to the liquid phase space.

Optionally, the pipeline preseparator includes first drain pipe, communicating pipe and first outlet duct, the one end and the first feed liquor pipe intercommunication of first drain pipe, be provided with the venthole on the lateral wall of first drain pipe, first outlet duct one end is provided with turns to the return bend, the other end with first intake pipe intercommunication, communicating pipe one end with the venthole intercommunication, the other end passes through turn to the return bend with first outlet duct intercommunication.

Optionally, the first cyclonic gas-liquid separator is a first cyclone barrel or cyclone tube.

Optionally, the first cyclone cartridge comprises:

a first cylinder;

one end of the second liquid inlet pipe is communicated with the first liquid inlet pipe, and the other end of the second liquid inlet pipe is communicated with the first cylinder;

the second liquid outlet pipe is arranged on the side wall of the first cylinder, one end of the second liquid outlet pipe is communicated with the first cylinder, and the other end of the second liquid outlet pipe is communicated with the liquid phase space;

and the second air outlet pipe is arranged on the axis of the first cylinder, one end of the second air outlet pipe is communicated with the first cylinder, and the other end of the second air outlet pipe is communicated with the gas phase space.

Optionally, the second cyclonic gas-liquid separator is a second cyclone cartridge comprising:

a second cylinder;

one end of the second air inlet pipe is communicated with the gas phase space, and the other end of the second air inlet pipe is communicated with the second cylinder;

one end of the third liquid outlet pipe is communicated with the second cylinder, and the other end of the third liquid outlet pipe is communicated with the liquid phase space;

and the third air outlet pipe is arranged on the axis of the second cylinder and is configured to output the gas separated from the second cylinder.

Optionally, the second cyclonic gas-liquid separator further comprises a wire mesh trap configured to trap droplets in the gas within the second barrel.

Optionally, a flow guiding inclined plane is disposed at the bottom of the second cylinder, and the flow guiding inclined plane is configured to guide the liquid in the second cylinder to the third liquid outlet pipe.

Optionally, the pipe preseparator is connected to the main separator by a flange assembly.

Optionally, the main separator further comprises a main liquid outlet pipe, and the main liquid outlet pipe is arranged at the bottom of the main separator.

A hydrogen production system comprises an alkaline water electrolysis hydrogen production device and the alkaline water electrolysis hydrogen production gas-liquid separation system.

Has the advantages that:

the utility model provides an alkaline water electrolysis hydrogen production gas-liquid separation system, treat the gas-liquid mixture of separation through the pipeline preseparator and carry out preliminary gas-liquid separation, then carry out gas-liquid separation once more through the gas-liquid mixture of centrifugal force effect after preseparating through first spiral-flow type vapour and liquid separator, the gas of twice separation all enters into the gas phase space of main separator, subside through gravity, deviate from behind most large particle diameter liquid drops at output main separator, preseparation is carried out the gas-liquid mixture through setting up pipeline preseparator, can make the volume design of main separator littleer, thereby make this alkaline water electrolysis hydrogen production gas-liquid separation system volume diminish, and the separation efficiency of gas-liquid is higher.

Drawings

FIG. 1 is a schematic structural diagram of a gas-liquid separation system for hydrogen production by alkaline water electrolysis according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a gas-liquid separation system for hydrogen production by alkaline water electrolysis according to a second embodiment of the present invention;

fig. 3 is a schematic structural diagram of a gas-liquid separation system for hydrogen production by alkaline water electrolysis according to a third embodiment of the present invention.

In the figure:

100. a primary separator; 110. a first intake pipe; 120. a first liquid inlet pipe; 130. a main liquid outlet pipe;

200. a pipeline preseparator; 210. a first air outlet pipe; 220. a first liquid outlet pipe; 230. a communicating pipe; 240. a steering elbow;

300. a first cyclonic gas-liquid separator; 310. a first cyclone cartridge; 311. a first cylinder; 312. a second liquid inlet pipe; 313. a second liquid outlet pipe; 314. a second outlet pipe; 320. a swirl tube;

400. a second cyclonic gas-liquid separator; 410. a second cyclone drum; 411. a second cylinder; 4111. a guide slope; 412. a third liquid outlet pipe; 413. a third outlet pipe; 420. a wire mesh drip catcher;

500. a flange assembly.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures associated with the present invention are shown in the drawings, not all of them.

In the description of the present invention, unless otherwise explicitly specified or limited, the terms "connected", "connected" and "fixed" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood as a specific case by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the recitation of a first feature "on" or "under" a second feature may include the recitation of the first and second features being in direct contact, and may also include the recitation of the first and second features not being in direct contact, but being in contact with another feature between them. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used based on the orientations and positional relationships shown in the drawings, and are only for convenience of description and simplification of operation, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

Implement one

The embodiment provides a horizontal alkaline water electrolysis hydrogen production gas-liquid separation system, as shown in fig. 1, the horizontal alkaline water electrolysis hydrogen production gas-liquid separation system comprises a pipeline preseparator 200, a main separator 100, a first cyclone gas-liquid separator 300 and a second cyclone gas-liquid separator 400, one end of the pipeline preseparator 200 is provided with a pipeline input port, the pipeline input port is used for being communicated with an electrolytic bath, the other end of the pipeline preseparator 200 is provided with a first gas outlet and a first liquid outlet, one side of the main separator 100 close to the pipeline preseparator 200 is provided with a first gas inlet pipe 110 and a first liquid inlet pipe 120, the first gas outlet is communicated with the first gas inlet pipe 110, the first liquid outlet is communicated with the first liquid inlet pipe 120, the first cyclone gas-liquid separator 300 is arranged in the main separator 100, the first cyclone gas-liquid separator 300 is communicated with the first liquid inlet pipe 120, the gas-liquid mixture from the electrolytic tank enters a horizontal pipeline from the pipeline input port of the pipeline pre-separator 200 in a slug flow or laminar flow or a combination mode of the slug flow and the laminar flow, flows to the main separator 100 along the horizontal pipeline, in the flowing process, the free gas flows upwards and enters the gas phase space of the main separator 100 through the first gas inlet pipe 110, the rest gas-liquid mixture enters the first cyclone gas-liquid separator 300 through the first liquid inlet pipe 120, under the action of the centrifugal force of the first cyclone gas-liquid separator 300, the gas-liquid mixture after pre-separation is subjected to gas-liquid separation again through the centrifugal force of the first cyclone gas-liquid separator 300, the gas separated by the pipeline pre-separator 200 and the first cyclone gas-liquid separator 300 enters the gas phase space of the main separator 100, the separated liquid enters the liquid phase space of the main separator 100, after gravity settling, most of the large-sized droplets are removed and can be directly output from the main separator 100. The gas-liquid mixture is pre-separated by the pipeline pre-separator 200, so that the volume of the main separator 100 can be designed to be smaller, the volume of the alkaline water electrolysis hydrogen production gas-liquid separation system is reduced, and the gas-liquid separation efficiency is higher.

Preferably, the alkaline water electrolysis hydrogen production gas-liquid separation system further comprises a second cyclone gas-liquid separator 400, the second cyclone gas-liquid separator 400 is arranged at the top of the main separator, so that gas in the gas phase space of the main separator 100 is subjected to gas-liquid separation through the second cyclone gas-liquid separator 400, separated liquid flows back into the main separator 100, the separated gas is output from the main separator 100, liquid drops suspended in the gas are further separated through the action of centrifugal force of the second cyclone gas-liquid separator 400, and the gas-liquid separation efficiency of the alkaline water electrolysis hydrogen production gas-liquid separation system is further improved.

Preferably, the pipe preseparator 200 comprises a first liquid outlet pipe 220, a communicating pipe 230 and a first gas outlet pipe 210, one end of the first liquid outlet pipe 220 is communicated with the first liquid inlet pipe 120, the other end is communicated with the electrolytic bath, a gas outlet hole is arranged on the side wall of the first liquid outlet pipe 220, a turning bent pipe 240 is arranged at the leftmost end of the first gas outlet pipe 210, the rightmost end is communicated with the first gas inlet pipe 110, one end of the communicating pipe 230 is communicated with the gas outlet hole, and the other end is communicated with the first gas outlet pipe 210 through the turning bent pipe 240.

Further, as shown in fig. 1, a plurality of air outlets are arranged on the first liquid outlet pipe 220 at intervals, a plurality of air inlets are arranged on the first air outlet pipe 210 at intervals, the air outlets correspond to the air inlets in a one-to-one manner, the pipeline preseparator 200 includes a plurality of communicating pipes 230, except that the communicating pipe at the leftmost end is communicated with the first air outlet pipe through a transfer elbow, one end of each communicating pipe 230 is communicated with one air outlet, the other end of each communicating pipe is communicated with one air inlet, and by arranging the plurality of communicating pipes 230, it is ensured that in the flowing process of the gas-liquid mixture, gas is initially discharged above the pipeline, gas at the upper side passes through the communicating pipes 230, the first air outlet pipe 210 enters the gas phase space in the main separator 100 through the first air inlet pipe 110, and preliminary gas-liquid separation is realized for the gas-liquid mixture.

Specifically, the first cyclone-type gas-liquid separator 300 in this embodiment is a first cyclone cylinder 310, and the first cyclone cylinder 310 separates the gas in the gas-liquid mixture into the gas phase space of the main separator 100 by centrifugal force.

Preferably, as shown in fig. 1, the first cyclone cylinder 310 includes a first cylinder 311, a second liquid inlet pipe 312, a second liquid outlet pipe 313, and a second gas outlet pipe 314, wherein one end of the second liquid inlet pipe 312 is communicated with the first liquid inlet pipe 120, the other end is communicated with the first cylinder 311, the second liquid outlet pipe 313 is disposed on the side wall of the cylinder, and the second liquid outlet pipe 313 is disposed at the upper end of the second liquid inlet pipe 312, one end of the second liquid outlet pipe 313 is communicated with the first cylinder 311, the other end is communicated with the liquid phase space, the second gas outlet pipe 314 is disposed on the axis of the first cylinder 311, one end of the second gas outlet pipe 314 is communicated with the first cylinder 311, the other end is communicated with the gas phase space, under the action of the rotational flow centrifugal force of the first cylinder 311, the gas-liquid mixture is thrown to the cylinder wall of the first cylinder 311 due to the large density difference, the gas is gathered at the center of the first cylinder 311, and then overflows into the gas phase space of the main separator 100 through the second gas outlet pipe 313 on the side wall of the first cylinder 311, and the liquid enters the liquid phase space of the main separator 100.

Preferably, as shown in fig. 1, the second cyclone-type gas-liquid separator 400 of this embodiment is a second cyclone-type cartridge 410, the second cyclone-type cartridge 410 is disposed at the upper end of the main separator 100, the second cyclone-type cartridge 410 includes a second cylinder 411, a second air inlet pipe, a third liquid outlet pipe 412 and a third gas outlet pipe 413, the second air inlet pipe is disposed at the lower end of the second cylinder 411, one end of the second air inlet pipe is communicated with the gas phase space, the other end of the second air inlet pipe is communicated with the second cylinder 411, the third liquid outlet pipe 412 is disposed on the side wall of the second cylinder 411, one end of the third liquid outlet pipe 412 is communicated with the second cylinder 411, the other end of the third liquid outlet pipe 412 is exposed in the gas phase space of the main separator 100, and the third gas outlet pipe 413 is disposed on the axis of the second cylinder 411. The gas in the gas phase space in the main separator 100 is settled by gravity to remove most of the liquid drops with large particle size, and then enters the second cylinder 411 through the second gas inlet pipe, the liquid drops with large particle size in the gas are further removed through the centrifugal action of the second cylinder 411, the removed liquid drops flow out from the third liquid outlet pipe 412, flow into the liquid phase space through the gas phase space of the main separator 100, and the gas is output through the third gas outlet pipe 413.

Preferably, as shown in fig. 1, the second cyclone-type gas-liquid separator 400 further includes a wire mesh drop trap 420, the wire mesh drop trap 420 is disposed in the second cylinder 411, the gas in the second cylinder 411 flows upward through the wire mesh drop trap 420 and then enters the third gas outlet pipe 413 to be output to the collection container, droplets above 5 μm to 10 μm in the gas are removed under the action of the wire mesh drop trap 420, only droplets below 5 μm to 10 μm in particle size remain in the gas, the separation efficiency can reach above 99%, which greatly reduces the load of the subsequent washing and purifying system, improves the efficiency, and thus effectively reduces the size of the corresponding equipment.

Optionally, the bottom of the second cylinder 411 is provided with a diversion slope, and the third outlet pipe 412 is also inclined towards the main separator 100, the diversion slope is used for diverting the liquid in the second cylinder 411 to the third outlet pipe 412, and the third outlet pipe 412 diverts the liquid to the main separator 100.

Optionally, the pipe preseparator 200 is connected to the main separator 100 through a flange assembly 500, specifically, a first flange is disposed at one end of the first liquid outlet pipe 220 of the pipe preseparator 200, which is close to the main separator 100, and a second flange is disposed at one end of the first liquid inlet pipe 120, which is far from the main separator 100, and the first flange and the second flange are disposed oppositely and fastened through bolts. One end of the first outlet pipe 210 close to the main separator 100 is provided with a third flange, one end of the first inlet pipe 110 far from the main separator 100 is provided with a fourth flange, the third flange and the fourth flange are arranged oppositely, and the third flange is fastened through the fourth flange.

Preferably, the main separator 100 further comprises a main liquid outlet pipe 130, the main liquid outlet pipe 130 is disposed at the bottom of the main separator 100, one end of the main liquid outlet pipe 130 is communicated with the inside of the main separator 100, and the other end is communicated with the electrolytic cell, so that the liquid passing through the gas-liquid separator flows back to the electrolytic cell for circulation, thereby improving the utilization rate of resources.

The horizontal alkaline water electrolysis hydrogen production gas-liquid separation system provided by the embodiment has the working principle that:

the gas-liquid mixture in the electrolytic cell flows into the first liquid outlet pipe 220 through the pipe input port of the pipe pre-separator 200 in a stratified flow or slug flow mode, the gas-liquid mixture flows along the first liquid outlet pipe 220, when passing through the vertical communicating pipe 230, the free gas flows upwards from the vertical communicating pipe 230 and is collected at the first gas outlet pipe 210, and then flows into the gas phase space of the main separator 100, while the liquid in the first liquid outlet pipe 220 flows through the second cyclone through the action of centrifugal force, the gas-liquid mixture is thrown to the cylinder wall due to the large density difference, flows out from the second liquid outlet pipe 313 on the upper side wall of the first cylinder 311, the gas is gathered at the center of the first cyclone cylinder 310, and then overflows from the second gas outlet pipe 314 in the middle into the gas phase space of the main separator 100. The gas separated by the pipe pre-separator 200 and the first cyclone gas-liquid separator 300 is settled by gravity in the main separator 100 to remove most of droplets with large particle size, then enters the second cyclone cylinder 410 from the inlet of the second cyclone cylinder 410, similarly, under the action of cyclone centrifugal force, the droplets in the gas are thrown to the wall surface and flow down, then are gathered at the bottom of the second cylinder 411, flow along the guide inclined plane 4111 with slope at the bottom of the second cylinder 411, flow out through the third liquid outlet pipe 412, pass through the gas phase space of the main separator 100 and enter the liquid phase space of the main separator 100, the gas passes through the screen drop trap 420 upwards, and under the action of the outlet cyclone and the screen drop trap 420, the droplets with the size of more than 5-10 μm are removed.

Example two

This implementation provides a vertical alkaline water electrolysis hydrogen manufacturing gas-liquid separation system, the structure with embodiment one is basically the same, lie in with embodiment one, main separator 100 in this embodiment is vertical to be placed, as shown in fig. 2, the second drain pipe 313 of first spiral-flow type vapour-liquid separator 300 sets up in the bottom of first barrel 311, second feed liquor pipe 312 sets up the upper end at second drain pipe 313, make the fluid get into in first barrel 311 under drive power and action of gravity, increase the whirl degree, impel the gas-liquid mixture better separation, thereby improve the separation efficiency of first spiral-flow type vapour-liquid separator 300.

EXAMPLE III

As shown in fig. 3, this embodiment provides another horizontal alkaline water electrolysis hydrogen production gas-liquid separation system, the structure is basically the same as that of embodiment one, and the structure difference with embodiment one lies in that, in this embodiment, the first cyclone gas-liquid separator 300 is a cyclone tube 320, a cyclone liquid guide plate is arranged in the cyclone tube 320, a gas-liquid mixture forms a cyclone in the pipeline through the flow guide of the cyclone liquid guide plate, the liquid is thrown to the inner wall of the pipeline, the gas is gathered in the middle of the pipeline, a gas core is formed, and then the gas phase space flows out from the pipeline arranged at the center of the pipeline and enters the main separator 100, and the cyclone tube 320 has a simple structure, a lower cost, and is convenient to maintain.

Example four

The embodiment provides a hydrogen production system, which comprises an alkaline water electrolysis hydrogen production device and the alkaline water electrolysis hydrogen production gas-liquid separation system in any embodiment, wherein the alkaline water electrolysis hydrogen production gas-liquid separation system is connected with the alkaline water electrolysis hydrogen production device, and the alkaline water electrolysis hydrogen production gas-liquid separation system can separate gas and liquid of a gas-liquid mixture output from the alkaline water electrolysis hydrogen production device to obtain hydrogen with higher purity, so that the hydrogen production efficiency of the hydrogen production system is improved.

It is to be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. Numerous obvious variations, rearrangements and substitutions will now occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (11)

1. The alkaline water electrolysis hydrogen production gas-liquid separation system is characterized by comprising:

the separator comprises a main separator (100), wherein a first air inlet pipe (110) and a first liquid inlet pipe (120) are arranged on the main separator (100);

the pipeline preseparator (200) comprises a first gas outlet and a first liquid outlet, the first gas outlet is communicated with the first gas inlet pipe (110), and the first liquid outlet is communicated with the first liquid inlet pipe (120);

first spiral-flow type vapour and liquid separator (300), set up in main separator (100), first spiral-flow type vapour and liquid separator (300) with first feed liquor pipe (120) intercommunication, first spiral-flow type vapour and liquid separator (300) are configured as and carry out gas-liquid separation again through the effect of centrifugal force with the gas-liquid mixture after the preseparation, and the gas of separation enters into in the gas phase space of main separator (100), the liquid of separation enters into in the liquid phase space of main separator (100).

2. The alkaline water electrolysis hydrogen production gas-liquid separation system according to claim 1, further comprising a second cyclone gas-liquid separator (400), wherein the second cyclone gas-liquid separator (400) is communicated with the gas phase space, the second cyclone gas-liquid separator (400) is configured to perform gas-liquid separation on the gas in the gas phase space, output the separated gas, and return the separated liquid to the liquid phase space.

3. The alkaline water electrolysis hydrogen production gas-liquid separation system according to claim 1, wherein the pipeline preseparator (200) comprises a first liquid outlet pipe (220), a communicating pipe (230) and a first gas outlet pipe (210), one end of the first liquid outlet pipe (220) is communicated with the first liquid inlet pipe (120), a gas outlet hole is arranged on the side wall of the first liquid outlet pipe (220), a turning bent pipe (240) is arranged at one end of the first gas outlet pipe (210), the other end of the first gas outlet pipe is communicated with the first gas inlet pipe (110), one end of the communicating pipe (230) is communicated with the gas outlet hole, and the other end of the communicating pipe is communicated with the first gas outlet pipe (210) through the turning bent pipe (240).

4. The alkaline water electrolysis hydrogen production gas-liquid separation system according to claim 1, wherein the first cyclone-type gas-liquid separator (300) is a first cyclone barrel (310) or cyclone tube (320).

5. The alkaline water electrolysis hydrogen production gas-liquid separation system according to claim 4, wherein the first cyclone cartridge (310) comprises:

a first barrel (311);

a second liquid inlet pipe (312), one end of which is communicated with the first liquid inlet pipe (120), and the other end of which is communicated with the first cylinder (311);

the second liquid outlet pipe (313) is arranged on the side wall of the first cylinder (311), one end of the second liquid outlet pipe (313) is communicated with the first cylinder (311), and the other end of the second liquid outlet pipe is communicated with the liquid phase space;

and the second air outlet pipe (314) is arranged on the axis of the first cylinder (311), one end of the second air outlet pipe (314) is communicated with the first cylinder (311), and the other end of the second air outlet pipe is communicated with the gas phase space.

6. The alkaline water electrolysis hydrogen production gas-liquid separation system according to claim 2, wherein the second cyclone-type gas-liquid separator (400) is a second cyclone cartridge (410), and the second cyclone cartridge (410) comprises:

a second cylinder (411);

one end of the second air inlet pipe is communicated with the gas phase space, and the other end of the second air inlet pipe is communicated with the second cylinder (411);

a third liquid outlet pipe (412), one end of which is communicated with the second cylinder (411), and the other end of which is communicated with the liquid phase space;

and the third air outlet pipe (413) is arranged on the axis of the second cylinder (411), and the third air outlet pipe (413) is configured to output the gas separated from the second cylinder (411).

7. The alkaline water electrolysis hydrogen production gas-liquid separation system according to claim 6, wherein the second cyclone-type gas-liquid separator (400) further comprises a wire mesh drop trap (420), and the wire mesh drop trap (420) is configured to trap liquid drops in the gas in the second cylinder (411).

8. The alkaline water electrolysis hydrogen production gas-liquid separation system according to claim 6, wherein the bottom of the second cylinder (411) is provided with a flow guiding inclined plane configured to guide the liquid in the second cylinder (411) to the third liquid outlet pipe (412).

9. The alkaline water electrolysis hydrogen production gas-liquid separation system according to claim 1, wherein the pipe pre-separator (200) is connected with the main separator (100) through a flange assembly (500).

10. The alkaline water electrolysis hydrogen production gas-liquid separation system according to claim 1, wherein the main separator (100) further comprises a main liquid outlet pipe (130), and the main liquid outlet pipe (130) is arranged at the bottom of the main separator (100).

11. A hydrogen production system comprising an alkaline water electrolysis hydrogen production apparatus and the alkaline water electrolysis hydrogen production gas-liquid separation system according to any one of claims 1 to 10.

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