A high-efficiency gas-liquid separator for hydrogen recirculation in a proton exchange membrane fuel cell system

Abstract

This invention provides a high-efficiency gas-liquid separator for hydrogen recirculation in a proton exchange membrane fuel cell system, comprising: a shell, the interior of which, from bottom to top, includes a liquid collection section, an air inlet distribution section, a gas-liquid separation section, and a gas emission section. The liquid collection section has a liquid collection chamber; the air inlet distribution section has a cavity and an air inlet extending into the cavity; the gas-liquid separation section has a liquid removal baffle assembly, comprising several vertically arranged liquid removal baffles, each baffle being a corrugated plate with several bent structures; and the gas emission section has a metal braided mesh and a gas collection chamber, the metal braided mesh positioned above the liquid removal baffle assembly, and the gas collection chamber positioned above the metal braided mesh. This invention solves the problems of low hydrogen recirculation flow and uneven droplet separation particle size affecting the stability and lifespan of the recirculation pump in existing technologies.

Description

Technical Field

[0001] This invention relates to the field of proton exchange membrane fuel cell system technology, and more particularly to a high-efficiency gas-liquid separator for recirculation in a proton exchange membrane fuel cell system. Background Technology

[0002] In proton exchange membrane fuel cell systems, to maintain the water balance at the fuel cell anode, reduce concentration polarization during fuel cell operation, improve fuel efficiency, and increase the driving range of vehicles equipped with fuel cell systems, a hydrogen recirculation / emission system is generally included. This system uses a gas-liquid separator to separate liquid water entrained in the recirculated gas, ensuring that the recirculated gas re-enters the fuel cell stack without any liquid water entrainment. Currently, the gas-liquid separators used are mainly divided into two types: cyclone type and baffle type, also known as labyrinth type. Their basic separation principle is to change the flow direction of the gas flow, utilizing the difference in inertial forces between gas and liquid to separate the gas and liquid droplets in the gas flow.

[0003] Cyclone gas-liquid separators use an impeller or intake at the tangent of a circle to rotate the airflow. The difference between centrifugal force and the inertial force of the gas and liquid forces forces liquid droplets out of the airflow, while the gas experiences less centrifugal force and its flow direction remains largely unchanged, thus achieving gas-liquid separation. Cyclone gas-liquid separators have high separation efficiency and controllable particle size when the gas flow rate reaches the design point. However, the separation efficiency decreases significantly when the gas flow rate is below or above the design point, and the pressure drop is also significant at high flow rates. Fuel cells operate under relatively wide conditions with large flow rate variations, and cyclone gas-liquid separators cannot meet the requirements of fuel cells operating at low loads.

[0004] Baffle or labyrinth gas-liquid separators consist of several sets of baffles of different shapes arranged in a labyrinthine pattern on the internal flow channel of the gas-liquid separator. This causes the airflow to change direction multiple times. Gas has low inertia and its flow direction is easily changed, while liquid droplets, due to their high inertia, collide with the baffle walls and accumulate on the baffles, thus separating the droplets from the airflow. Baffle or labyrinth gas-liquid separators have high separation efficiency at low flow rates, but low separation efficiency at high flow rates, and the separation particle size of liquid water is basically uncontrollable.

[0005] The current cyclone gas-liquid separator has a large resistance drop, which limits the hydrogen return flow of the reflux pump and ejector. Moreover, it has low separation efficiency, high water content in the gas flow, and large droplet size when it is not at the design operating point. The resistance drop of the baffle or labyrinth gas-liquid separator is relatively lower than that of the cyclone separator, but the droplet separation size is often uncontrollable, which will affect the performance and life of the reflux pump and ejector. Summary of the Invention

[0006] To address the technical problems of low hydrogen reflux flow rate and uncontrollable uneven droplet size in cyclone or baffle-type gas-liquid separators, which affect the stability and lifespan of the reflux pump, this invention provides a high-efficiency gas-liquid separator for hydrogen reflux in proton exchange membrane fuel cell systems. This invention primarily utilizes liquid-removing baffles and demisting metal braided mesh, leveraging the inertial force differences in the mixed fluids to achieve efficient gas-liquid separation of the mixed gas and uniform, controllable droplet size, thereby improving the hydrogen reflux flow rate and operational stability of the fuel cell.

[0007] The technical means employed in this invention are as follows:

[0008] A high-efficiency gas-liquid separator for hydrogen recirculation in a proton exchange membrane fuel cell system includes: a housing, wherein the interior of the housing comprises, from bottom to top, a liquid collection section, an air inlet distribution section, a gas-liquid separation section, and a gas emission section;

[0009] The liquid collection section is provided with a liquid collection chamber;

[0010] The air intake distribution section is provided with a cavity and an air intake port extending into the cavity;

[0011] The gas-liquid separation section is equipped with a liquid removal baffle assembly, which includes several vertically arranged liquid removal baffles, and the liquid removal baffles are corrugated plates with several bending structures.

[0012] The gas emission section is equipped with a metal woven mesh and a gas collection chamber. The metal woven mesh is located above the liquid removal baffle assembly, and the gas collection chamber is located above the metal woven mesh.

[0013] Furthermore, the outer casing includes a lower part of the gas-liquid separator, a middle part of the gas-liquid separator, and an upper part of the gas-liquid separator;

[0014] The liquid collection section and the gas inlet distribution section are located in the lower part of the gas-liquid separator, the gas-liquid separation section is located in the middle part of the gas-liquid separator, and the gas emission section is located in the upper part of the gas-liquid separator.

[0015] Furthermore, a drain outlet is provided at the bottom of the liquid collection chamber, and a drain valve is provided at the drain outlet. The top of the liquid collection chamber is open and equipped with a gas-liquid separation baffle. A water level sensor is provided at the upper part of the liquid collection chamber.

[0016] Furthermore, an outlet is provided at the top of the gas collecting chamber, and a hydrogen concentration sensor is provided at the upper part of the gas collecting chamber.

[0017] Furthermore, the gas emission section is also provided with a hydrogen discharge port, which is located on the side of the metal braided mesh, and the hydrogen discharge port is equipped with a hydrogen discharge valve.

[0018] Furthermore, the detection range of the hydrogen concentration sensor is 0 to 100%, the accuracy requirement is ±1%, the response time is ≤1 second, the humidity meets 0 to 100% relative humidity, the operating temperature range meets -40℃ to 90℃, and the communication method is CAN2.0A / B.

[0019] Furthermore, in the liquid removal baffle assembly, the distance between adjacent liquid removal baffles is 10-15mm, each liquid removal baffle includes 2-4 bending structures, the width of each bending structure is 20-30mm, and the depth is 10-15mm. The liquid removal baffle is made of polymer material, glass fiber reinforced material corresponding to the polymer material, stainless steel 304 or stainless steel 316, and the polymer material is PPS, PPA, POM or PP.

[0020] Furthermore, the outer shell is made of stainless steel 304, stainless steel 316, PPS, PPA, POM, or corrosion-resistant aluminum alloy 6061 with surface anodizing treatment.

[0021] Furthermore, airflow equalization plates are respectively provided above and below the liquid removal baffle assembly.

[0022] Furthermore, the gas-liquid separator also includes a control unit, and the water level sensor, the drain valve, the hydrogen concentration sensor, and the hydrogen discharge valve are electrically connected to the control unit.

[0023] Compared with the prior art, the present invention has the following advantages:

[0024] 1. The present invention provides a high-efficiency gas-liquid separator for hydrogen recirculation in a proton exchange membrane fuel cell system. By setting up a liquid removal baffle and a metal braided mesh, the amount of liquid water and droplet size brought into the recirculation pump can be reduced throughout the entire operating range of the fuel cell, thereby improving the liquid separation efficiency and the life and performance of the recirculation pump. By using a mold to manufacture the liquid removal baffle, the separation accuracy of the gas-liquid separator and the performance consistency of each gas-liquid separator can be improved, effectively controlling the performance differences between individual gas-liquid separators, which is beneficial for mass production and cost reduction.

[0025] 2. The present invention provides a high-efficiency gas-liquid separator for hydrogen recirculation in a proton exchange membrane fuel cell system. By setting up a liquid removal baffle and a metal braided mesh, the resistance drop is reduced, and the recirculation flow rate of the recirculation pump and ejector can be increased at the same speed, effectively improving the operating stability of the fuel cell and the utilization rate of hydrogen.

[0026] 3. The present invention provides a high-efficiency gas-liquid separator for hydrogen recirculation in a proton exchange membrane fuel cell system, which has a simple structure, strong liquid separation capability, high separation efficiency, controllable droplet size separation, wide flow coverage, and reduced resistance.

[0027] Based on the above reasons, this invention can be widely promoted in fields such as fuel cell technology. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the gas-liquid separator described in this invention.

[0030] Figure 2 This is a cross-sectional view of the gas-liquid separator described in this invention.

[0031] Figure 3 This is an exploded view of the gas-liquid separator described in this invention.

[0032] Figure 4 This is a schematic diagram of the liquid removal baffle type described in this invention.

[0033] Figure 5 This is a schematic diagram of the liquid removal baffle plate aerosol separation principle described in this invention.

[0034] Figure 6 This is a schematic diagram of the gas-liquid separator described in this invention.

[0035] In the diagram: 201, air inlet; 202, air outlet; 203, drain outlet; 204, liquid collection chamber; 205, gas-liquid separation baffle; 206, cavity; 207, airflow equalization plate; 208, liquid removal baffle; 209, metal braided mesh; 210, gas collection chamber; 211, outer shell; 2-1, lower part of gas-liquid separator; 2-2, middle part of gas-liquid separator; 2-3, upper part of gas-liquid separator; 212, connecting flange; 213, hydrogen discharge port; 6, hydrogen concentration sensor; 7, water level sensor; 8, drain valve; 9, hydrogen discharge valve. Detailed Implementation

[0036] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0039] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0040] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0041] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0042] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0043] Example 1

[0044] like Figures 1-4 As shown, the present invention provides a high-efficiency gas-liquid separator for hydrogen recirculation in a proton exchange membrane fuel cell system, including a housing 211, wherein the housing 211 comprises, from bottom to top: a liquid collection section, an air inlet distribution section, a gas-liquid separation section and a gas emission section;

[0045] The outer casing 211 includes a lower gas-liquid separator 2-1, a middle gas-liquid separator 2-2, and an upper gas-liquid separator 2-3, which are fixedly connected from bottom to top by bolts passing through a connecting flange 212.

[0046] The liquid collection section and the gas inlet distribution section are located in the lower part 2-1 of the gas-liquid separator, the gas-liquid separation section is located in the middle part 2-2 of the gas-liquid separator, and the gas emission section is located in the upper part 2-3 of the gas-liquid separator;

[0047] The liquid collection section is provided with a liquid collection chamber 204, the bottom of the liquid collection chamber 204 is provided with a drain outlet 203, the drain outlet 203 is provided with a drain valve 8, and the top of the liquid collection chamber 204 is open and provided with a gas-liquid separation baffle 205.

[0048] The air intake distribution section is provided with a cavity 206 and an air inlet 201 extending into the cavity 206, and the air inlet 201 is located above the liquid collection cavity 204.

[0049] The gas-liquid separation baffle 205 is mainly to prevent the liquid water stored in the liquid collection chamber 204 from being splashed into the gas by the incoming gas-liquid mixture airflow and re-entering the gas, thus preventing secondary entrainment.

[0050] The cavity 206 is used for velocity redistribution during airflow recirculation;

[0051] The gas-liquid separation section is provided with a liquid removal baffle assembly, which includes a plurality of vertically arranged liquid removal baffles 208, and the liquid removal baffles 208 are corrugated plates including a plurality of bending structures.

[0052] Theoretically, the more liquid removal baffles 208 are set, the stronger the liquid separation capability. However, setting too many liquid removal baffles 208 will increase the resistance drop, cause secondary droplet entrainment, and severely reduce the liquid separation efficiency. Once the liquid removal baffle group is determined, the maximum flow rate of the gas-liquid mixture that can be processed can be determined. As long as the gas-liquid mixture is below the maximum flow rate, efficient gas-liquid separation can be achieved. That is, the gas-liquid separator of this embodiment is backward compatible with all flow ranges of the fuel cell system under the determined maximum operating flow rate and can operate efficiently in all operating flow ranges.

[0053] The gas emission section is equipped with a metal braided mesh 209 and a gas collection chamber 210. The metal braided mesh 209 is positioned above the liquid removal baffle assembly, and the gas collection chamber 210 is positioned above the metal braided mesh 209. The metal braided mesh 209 is used to remove small droplets from the gas-liquid mixture. The combined use of the liquid removal baffle 208 and the metal braided mesh 209 can improve the liquid separation efficiency of the gas-liquid separator and control the diameter range of droplets in the gas flow.

[0054] Furthermore, a water level sensor 7 is provided on the upper part of the liquid collection chamber 204.

[0055] Preferably, the water level sensor 7 is a capacitive water level sensor.

[0056] Furthermore, the gas-liquid separator also includes a control unit, and the water level sensor 7 and the drain valve 8 are respectively electrically connected to the control unit;

[0057] The water level sensor 7 is used to detect the water level in the liquid collection chamber 204, transmit the detection signal back to the control unit, and control the opening and closing of the drain valve 8 according to the preset threshold.

[0058] Specifically, when the liquid water level in the collection chamber 204 reaches the level sensed by the water level sensor 7, the control unit controls the drain valve 8 to open based on the detection signal received from the water level sensor 7, thereby draining the liquid water from the collection chamber 204. To avoid the gas-liquid mixture being discharged due to the drain valve 8 being open for too long, the opening time of the drain valve 8 will be determined based on the volume of liquid water in the collection chamber 204.

[0059] Furthermore, an outlet 202 is provided at the top of the gas collecting chamber 210, and a hydrogen concentration sensor 6 is provided on the upper part of the gas collecting chamber 210. The hydrogen concentration sensor 6 is used to detect the volume concentration of the reflux hydrogen in the gas-liquid separator.

[0060] Furthermore, the gas emission section is also provided with a hydrogen discharge port 213, which is located on the side of the metal braided mesh 209, and the hydrogen discharge port 213 is provided with a hydrogen discharge valve 9.

[0061] Preferably, the hydrogen discharge valve 9 is a diaphragm-type direct-acting solenoid valve that operates at freezing temperatures without the need for heating.

[0062] Furthermore, in the liquid removal baffle assembly, the distance between adjacent liquid removal baffles 208 is 10-15 mm.

[0063] Furthermore, such as Figure 5 As shown, the liquid removal baffle 208 includes 2 to 4 bending structures. The width of the bending structure is 20 to 30 mm, the depth is 10 to 15 mm, and the cross-sectional shape is C-shaped (208a) or trapezoidal (208b), but not limited to these.

[0064] Furthermore, the liquid removal baffle 208 is made of a polymer material, a glass fiber reinforced material corresponding to the polymer material, stainless steel 304 or stainless steel 316, and the polymer material is one of PPS, PPA, POM or PP.

[0065] Furthermore, airflow equalization plates 207 are respectively provided above and below the liquid removal baffle assembly. The airflow equalization plates 207 can be used to support the metal woven mesh 209 and to ensure that the gas-liquid mixture enters the liquid removal baffle assembly at the same flow rate.

[0066] Furthermore, the liquid removal baffle 208 is integrally formed by injection molding or 3D printing, and the gas-liquid separation baffle 205 and the airflow equalization plate 207 are also integrally formed by injection molding or 3D printing. To ensure that the gas-liquid separation baffle 205, the airflow equalization plate 207 and the liquid removal baffle 208 can be in close contact with the cavity of the outer shell 211 during installation and are securely installed, mounting slots or buckles are provided at the installation positions in the cavity of the outer shell 211, and the gas-liquid separator baffle 205, the airflow equalization plate 207 and the liquid removal baffle 208 are snapped into place inside the outer shell 211.

[0067] Furthermore, the outer shell 211 can be rectangular or cylindrical or a combination thereof, the cavity cross-section of the outer shell 211 can be square or circular or a combination thereof, the material of the outer shell 211 is one of stainless steel 304, stainless steel 316, PPS, PPA, POM or corrosion-resistant aluminum alloy 6061 with surface anodizing treatment, and the processing method is mold injection molding, 3D printing, etc.

[0068] Furthermore, the lower part 2-1 of the gas-liquid separator, the air inlet 201, and the gas-liquid separation baffle 205 are manufactured as a single unit.

[0069] Furthermore, the middle part 2-2 of the gas-liquid separator, the airflow averaging plate 207 and the liquid removal baffle 208 are manufactured as a single unit. An installation position for the airflow averaging plate 207 is reserved above the liquid removal baffle 208. The number of gas-liquid averaging plates 207 can be increased as needed.

[0070] Furthermore, the detection range of the hydrogen concentration sensor 6 is 0 to 100%, the accuracy requirement is ±1%, the response time is ≤1 second, the humidity meets 0 to 100% relative humidity, the operating temperature range is -40℃ to 90℃, and it adopts CAN2.0A / B communication mode.

[0071] Furthermore, the hydrogen concentration sensor 6 and the hydrogen discharge valve 9 are electrically connected to the control unit.

[0072] Furthermore, all internal structures of the gas-liquid separator are installed using a snap-fit ​​method with slots or buckles to ensure a secure installation. After installation, the gas-liquid separator is subjected to a pressure test to ensure there is no external leakage.

[0073] The gas-liquid separation principle of the liquid removal baffle 208 described in this invention is as follows: Figure 5As shown, due to the different inertial forces of gas and liquid, when the gas-liquid mixture enters the liquid removal baffle assembly, the gas-liquid mixture continues to flow forward. When it encounters a bend, the gas has a lower density and smaller inertial force, making it easier to change its flow direction. The gas will continue to flow along the direction of the bend. However, the liquid has a much higher density than the gas and a larger inertial force. When it encounters a bend, its flow direction is not easily changed. It will collide with the wall of the liquid removal baffle 208 according to its original flow path and accumulate on the wall of the liquid removal baffle 208. As the gas-liquid mixture continues to flow, more and more droplets collide with the wall, forming a liquid film on the wall and accumulating into large droplets. When the weight of the droplet is greater than the drag force of the airflow, the droplet will converge downward into the liquid collection chamber 204.

[0074] The gas-liquid separation principle of the gas-liquid separator is as follows: Figure 6As shown, the working process of the gas-liquid separator is as follows: The gas-liquid mixture flows into the liquid collection chamber 204 through the air inlet 201, where the flow velocity is significantly reduced. Large liquid droplets in the gas flow, under the influence of gravity, are blocked by the gas-liquid separation baffle 205 and enter the liquid collection chamber 204. The gas flow then passes over the gas-liquid separation baffle 205 and enters the cavity 206, flowing upwards and undergoing velocity redistribution within the cavity 206. After passing through the airflow equalization plate 207, the gas flow... The airflow flows uniformly into the flow channel formed by the liquid removal baffle 208 at the same velocity. At the bend of the liquid removal baffle 208, due to the difference in inertial forces between the gas and liquid, the droplets in the airflow collide with and accumulate on the wall surface of the liquid removal baffle 208. When the droplets accumulate to a certain size, they fall off the wall surface under the action of gravity and enter the liquid collection chamber 204. After the airflow passes through 2 to 4 deflection collisions of the liquid removal baffle assembly, 90% of the droplets with a diameter greater than 40 μm in the airflow can be removed. The gas flow continues upward, passing through the gas-liquid separation baffle 205 and the metal braided mesh 209. During this process, low-diameter droplets that are not removed from the gas flow collide with the metal braided mesh 209, aggregate, and fall into the liquid collection chamber 204. The gas flow then enters the gas collection chamber 210. The hydrogen concentration sensor 6 detects the gas flow and transmits the detected hydrogen concentration value to the control unit. The control unit controls the start and stop of the hydrogen discharge valve 9 according to a preset threshold. When the hydrogen concentration value detected by the hydrogen concentration sensor is lower than the threshold preset in the control unit, the control unit controls the hydrogen discharge valve 9 to start, allowing the gas flow to exit the gas-liquid separator through the hydrogen discharge port 213. The discharged gas flow is used to increase the hydrogen concentration so that pure hydrogen can enter. At this time, the mixed gas with the liquid water removed can meet the requirements of the reflux pump and fuel cell for the liquid water content. The mixed gas with the liquid water removed flows out of the gas-liquid separator through the gas outlet 202, and after being pressurized, it returns to the fuel cell to participate in the reaction.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-efficiency gas-liquid separator for hydrogen backflow of a proton exchange membrane fuel cell system, characterized in that it comprises : an outer shell, the inside of which comprises from bottom to top a liquid collecting section, an air inlet distribution section, a gas-liquid separation section, and a gas discharge section; the liquid collecting section is provided with a liquid collecting cavity; the air inlet distribution section is provided with a cavity and an air inlet extending into the cavity; the gas-liquid separation section is provided with a liquid removal baffle group, which comprises a plurality of vertically arranged liquid removal baffles, the liquid removal baffles being corrugated plates comprising a plurality of bending structures; the gas discharge section is provided with a metal mesh and a gas collecting cavity, the metal mesh being arranged above the liquid removal baffle group, and the gas collecting cavity being arranged above the metal mesh; in the liquid removal baffle group, the distance between adjacent liquid removal baffles is 10-15 mm, the liquid removal baffles comprise 2-4 bending structures, the width of the bending structure is 20-30 mm, the depth of the bending structure is 10-15 mm, the material of the liquid removal baffles is high polymer material, high polymer material corresponding glass fiber reinforced material, stainless steel 304 or stainless steel 316, and the high polymer material is PPS, PPA, POM or PP.

2. The high-performance gas-liquid separator for hydrogen backflow of a proton exchange membrane fuel cell system according to claim 1, characterized by, the outer shell comprises a lower part of the gas-liquid separator, a middle part of the gas-liquid separator, and an upper part of the gas-liquid separator; the liquid collecting section and the air inlet distribution section are arranged in the lower part of the gas-liquid separator, the gas-liquid separation section is arranged in the middle part of the gas-liquid separator, and the gas discharge section is arranged in the upper part of the gas-liquid separator.

3. The high-performance gas-liquid separator for hydrogen backflow of a proton exchange membrane fuel cell system according to claim 1, characterized by, a drain port is arranged at the bottom of the liquid collecting cavity, the drain port is provided with a drain valve, the top of the liquid collecting cavity is open and provided with a gas-liquid separation baffle, and a water level sensor is arranged at the upper part of the liquid collecting cavity.

4. The high-performance gas-liquid separator for hydrogen backflow of a proton exchange membrane fuel cell system according to claim 3, characterized by a gas outlet is arranged at the top of the gas collecting cavity, and a hydrogen concentration sensor is arranged at the upper part of the gas collecting cavity.

5. The high-performance gas-liquid separator for hydrogen backflow of a proton exchange membrane fuel cell system according to claim 4, characterized by the gas discharge section is further provided with a hydrogen discharge port, the hydrogen discharge port is located at the side of the metal mesh, and the hydrogen discharge port is provided with a hydrogen discharge valve.

6. The high-performance gas-liquid separator for hydrogen backflow of a proton exchange membrane fuel cell system according to claim 4, characterized by the detection range of the hydrogen concentration sensor is 0-100%, the accuracy requirement is ±1%, the reaction time is ≤1 second, the humidity meets 0-100% relative humidity, the working temperature range meets -40℃-90℃, and the CAN2.0A / B communication mode is adopted.

7. The high-performance gas-liquid separator for hydrogen backflow of a proton exchange membrane fuel cell system according to claim 1, characterized by, the material of the outer shell is stainless steel 304, stainless steel 316, PPS, PPA, POM, or corrosion-resistant aluminum alloy 6061 treated by surface anodization.

8. The high-performance gas-liquid separator for hydrogen backflow of a proton exchange membrane fuel cell system according to claim 1, characterized by, air flow uniformizing plates are arranged above and below the liquid removal baffle group, respectively.

9. The high-performance gas-liquid separator for hydrogen backflow of a proton exchange membrane fuel cell system according to claim 5, characterized by, the gas-liquid separator further comprises a control unit, and the water level sensor, the drain valve, the hydrogen concentration sensor, and the hydrogen discharge valve are electrically connected to the control unit, respectively.

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