CN115528277A - Efficient gas-liquid separator for hydrogen reflux of proton exchange membrane fuel cell system - Google Patents
Efficient gas-liquid separator for hydrogen reflux of proton exchange membrane fuel cell system Download PDFInfo
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- CN115528277A CN115528277A CN202211134308.6A CN202211134308A CN115528277A CN 115528277 A CN115528277 A CN 115528277A CN 202211134308 A CN202211134308 A CN 202211134308A CN 115528277 A CN115528277 A CN 115528277A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04082—Arrangements for control of reactant parameters, e.g. pressure or concentration
- H01M8/04089—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants
- H01M8/04119—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants with simultaneous supply or evacuation of electrolyte; Humidifying or dehumidifying
- H01M8/04156—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants with simultaneous supply or evacuation of electrolyte; Humidifying or dehumidifying with product water removal
- H01M8/04164—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants with simultaneous supply or evacuation of electrolyte; Humidifying or dehumidifying with product water removal by condensers, gas-liquid separators or filters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
- B01D50/20—Combinations of devices covered by groups B01D45/00 and B01D46/00
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Abstract
The invention provides a high-efficiency gas-liquid separator for hydrogen reflux of a proton exchange membrane fuel cell system, which comprises: the shell, supreme collection liquid section, the distribution section that admits air, gas-liquid separation section and the gas emission section of including is followed to inside down of shell, collection liquid section is provided with a collection liquid chamber, the distribution section that admits air is provided with the cavity and stretches into the air inlet of cavity, the gas-liquid separation section is provided with except that liquid folded plate group, remove that liquid folded plate group includes the liquid folded plate that removes of a plurality of vertical settings, remove the buckled plate that the liquid folded plate is for including a plurality of bending structures, the gas emission section is provided with woven wire netting and gas collection chamber, woven wire netting set up in remove liquid folded plate group top, the gas collection chamber set up in woven wire netting top. The technical scheme of the invention solves the problems that the stability and the service life of a reflux pump are influenced by low hydrogen reflux amount and non-uniform droplet separation particle size in the prior art.
Description
Technical Field
The invention relates to the technical field of proton exchange membrane fuel cell systems, in particular to a high-efficiency gas-liquid separator for backflow of a proton exchange membrane fuel cell system.
Background
In order to maintain the water balance of the anode of the fuel cell, reduce the concentration polarization during the operation of the fuel cell, improve the utilization rate of fuel and increase the endurance mileage of a vehicle equipped with the fuel cell system, a proton exchange membrane fuel cell system is generally provided with a hydrogen reflux/discharge system, and liquid water entrained in reflux gas is separated out through a gas-liquid separator, so that the reflux gas does not have liquid water entrainment when entering the fuel cell stack again. At present, the gas-liquid separator mainly includes a cyclone type and a baffle type, also called a labyrinth type, and the basic separation principle is to separate gas and liquid droplets in a gas flow by changing the flow direction of the gas flow and utilizing the difference of inertia forces of the gas and the liquid.
The cyclone gas-liquid separator is characterized in that gas is fed from the tangent of a circle or an impeller, so that the gas flow rotates, liquid drops are thrown out of the gas flow by utilizing the difference between centrifugal force and the inertia force of the gas and separated from the gas flow, the centrifugal force borne by the gas is small, and the flow direction is basically unchanged, so that the gas-liquid separation effect is achieved. The operating conditions of the fuel cell are wide, the flow change is large, and the cyclone gas-liquid separator cannot meet the requirements of the fuel cell during low-load operation.
The baffle or labyrinth gas-liquid separator is characterized in that a plurality of groups of baffles with different forms like a labyrinth are arranged on an internal flow passage of the gas-liquid separator, so that the direction of airflow is changed for many times, the inertia of gas is small, the flowing direction is easy to change, liquid drops collide with the wall surface of the baffle due to large inertia and are gathered on the baffle, and then the liquid drops are separated from the airflow.
The resistance of the cyclone gas-liquid separator used at present is reduced greatly, the hydrogen backflow amount of a backflow pump and an ejector can be limited, and when the cyclone gas-liquid separator is at a non-designed working point, the separation efficiency is low, the water content of airflow is high, the particle size of liquid drops is also large, the resistance reduction of a baffle type or labyrinth gas-liquid separator is lower than that of the cyclone gas-liquid separator, but the particle size of the liquid drops is often uncontrollable, and the performance and the service life of the backflow pump and the ejector can be influenced.
Disclosure of Invention
According to the technical problems that the cyclone type or baffle type gas-liquid separator has low hydrogen reflux amount, the droplet separation particle size is not uniform, the stability and the service life of a reflux pump are uncontrollably influenced, and the like, the high-efficiency gas-liquid separator for hydrogen reflux of a proton exchange membrane fuel cell system is provided. The invention mainly uses the liquid removing folded plate and the defogging metal mesh grid and utilizes the difference of the inertia force of the mixed fluid to realize the high-efficiency gas-liquid separation of the mixed gas and the uniform and controllable particle size of the separated liquid drops, thereby improving the hydrogen reflux quantity of the fuel cell and the operation stability of the fuel cell.
The technical means adopted by the invention are as follows:
a high-efficiency gas-liquid separator for hydrogen reflux of a proton exchange membrane fuel cell system comprises: the shell comprises a liquid collection section, an air inlet distribution section, a gas-liquid separation section and a gas discharge section from bottom to top;
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 folded plate group, the liquid removal folded plate group comprises a plurality of vertically arranged liquid removal folded plates, and the liquid removal folded plates are corrugated plates comprising a plurality of bending structures;
the gas emission section is provided with a metal woven mesh and a gas collection cavity, the metal woven mesh is arranged above the liquid removing folded plate group, and the gas collection cavity is arranged above the metal woven mesh.
Further, the 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 gas inlet distributing section are disposed in a lower portion of the gas-liquid separator, the gas-liquid separating section is disposed in a middle portion of the gas-liquid separator, and the gas discharging section is disposed in an upper portion of the gas-liquid separator.
Further, a water outlet is formed in the bottom of the liquid collecting cavity, a drain valve is arranged on the water outlet, the top of the liquid collecting cavity is open and provided with a gas-liquid separation partition plate, and a water level sensor is arranged on the upper portion of the liquid collecting cavity.
Furthermore, the top of the gas collection cavity is provided with a gas outlet, and the upper part of the gas collection cavity is provided with a hydrogen concentration sensor.
Further, the gas discharge section still is provided with the hydrogen discharge mouth, the hydrogen discharge mouth is located the metal mesh grid side, the hydrogen discharge mouth is provided with the hydrogen discharge valve.
Furthermore, the detection range of the hydrogen concentration sensor is 0-100%, the precision requirement is +/-1%, the reaction time is less than or equal to 1 second, the humidity meets 0-100% relative humidity, the working temperature range meets-40-90 ℃, and a CAN2.0A/B communication mode is adopted.
Further, in the liquid removing folded plate group, the distance between adjacent liquid removing folded plates is 10-15 mm, each liquid removing folded plate comprises 2-4 bending structures, the width of each bending structure is 20-30 mm, the depth of each bending structure is 10-15 mm, the liquid removing folded plates are made of high polymer materials, glass fiber reinforced materials corresponding to the high polymer materials, stainless steel 304 or stainless steel 316, and the high polymer materials are PPS, PPA, POM or PP.
Further, the material of the shell is stainless steel 304, stainless steel 316, PPS, PPA, POM or corrosion-resistant aluminum alloy 6061 with anodized surface.
Furthermore, airflow uniform speed plates are arranged above and below the liquid removal folded plate group respectively.
Further, 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 with the control unit respectively.
Compared with the prior art, the invention has the following advantages:
1. the efficient gas-liquid separator for hydrogen reflux of the proton exchange membrane fuel cell system provided by the invention has the advantages that the liquid removing folded plate and the metal woven net are arranged, the amount of liquid water and the particle size of liquid drops brought into the reflux pump can be reduced in the full operation range of the fuel cell, the liquid separation efficiency and the service life and the performance of the reflux pump are improved, the liquid removing folded plate is manufactured through a mold, the separation precision of the gas-liquid separator and the performance consistency of each gas-liquid separator can be improved, the performance difference among the gas-liquid separator individuals is effectively controlled, the batch production is facilitated, and the cost is reduced.
2. The efficient gas-liquid separator for hydrogen backflow of the proton exchange membrane fuel cell system reduces resistance drop by arranging the liquid removing folded plate and the metal woven mesh, can improve the backflow amount of the backflow pump and the ejector at the same rotating speed, and effectively improves the operation stability of the fuel cell and the utilization rate of hydrogen.
3. The efficient gas-liquid separator for hydrogen reflux of the proton exchange membrane fuel cell system provided by the invention has the advantages of simple structure, strong liquid separation capability, high separation efficiency, controllable droplet particle size separation, wide flow coverage range and reduced resistance.
For the above reasons, the present invention can be widely applied to the fields of fuel cell technology and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic view of a gas-liquid separator according to the present invention.
FIG. 2 is a cross-sectional view of a gas-liquid separator according to the present invention.
Fig. 3 is an exploded view of the gas-liquid separator of the present invention.
FIG. 4 is a schematic view of a fluid removal flap of the present invention.
Fig. 5 is a schematic diagram illustrating the principle of aerosol separation of the liquid removal flap according to the present invention.
FIG. 6 is a schematic view of a gas-liquid separator according to the present invention.
In the figure: 201. an air inlet; 202. an air outlet; 203. a water discharge port; 204. a liquid collection cavity; 205. a gas-liquid separation separator; 206. a cavity; 207. an airflow uniform speed plate; 208. removing the liquid folded plate; 209. a metal mesh grid; 210. a gas collection cavity; 211. a housing; 2-1, the lower part of a gas-liquid separator; 2-2, the middle part of a gas-liquid separator; 2-3, the upper part of a gas-liquid separator; 212. a connecting flange; 213. a hydrogen discharge port; 6. a hydrogen concentration sensor; 7. a water level sensor; 8. a drain valve; 9. a hydrogen discharge valve.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. Any specific values in all examples shown and discussed herein are to be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the absence of any contrary indication, these directional terms are not intended to indicate and imply that the device or element so referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be considered as limiting the scope of the present invention: the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
For ease of description, spatially relative terms such as "over … …", "over … …", "over … …", "over", etc. may be used herein to describe the spatial positional relationship of one device or feature to another device or feature as shown in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and unless otherwise stated, the terms have no special meaning, and therefore, the scope of the present invention should not be construed as being limited.
Example 1
As shown in fig. 1 to 4, the present invention provides a high efficiency gas-liquid separator for hydrogen backflow of a proton exchange membrane fuel cell system, comprising a housing 211, wherein the inside of the housing 211, from bottom to top, comprises: the device comprises a liquid collection section, an air inlet distribution section, a gas-liquid separation section and a gas discharge section;
the shell 211 comprises a lower part 2-1 of the gas-liquid separator, a middle part 2-2 of the gas-liquid separator and an upper part 2-3 of the gas-liquid separator which are fixedly connected through bolts and a connecting flange 212 in sequence from bottom to top;
the liquid collecting section and the gas inlet distributing section are arranged in the lower part 2-1 of the gas-liquid separator, the gas-liquid separating section is arranged in the middle part 2-2 of the gas-liquid separator, and the gas discharging section is arranged in the upper part 2-3 of the gas-liquid separator;
the liquid collecting section is provided with a liquid collecting cavity 204, the bottom of the liquid collecting cavity 204 is provided with a water outlet 203, the water outlet 203 is provided with a drain valve 8, and the top of the liquid collecting cavity 204 is opened and is provided with a gas-liquid separation partition plate 205;
the air inlet distribution section is provided with a cavity 206 and an air inlet 201 extending into the cavity 206, and the air inlet 201 is positioned above the liquid collecting cavity 204;
the gas-liquid separation partition 205 is mainly used for preventing liquid water stored in the liquid collection chamber 204 from being blown by the entering gas-liquid mixture airflow to splash and enter the gas again, so that secondary entrainment occurs;
the cavity 206 is used for redistributing the flow rate when the airflow flows back;
the gas-liquid separation section is provided with a liquid removing folded plate group, the liquid removing folded plate group comprises a plurality of vertically arranged liquid removing folded plates 208, and the liquid removing folded plates 208 are corrugated plates with a plurality of bending structures;
theoretically, the more the number of the liquid removing folded plates 208 are, the stronger the liquid separating capability is, but the too large number of the liquid removing folded plates 208 increases resistance drop, secondary liquid drop entrainment occurs, and liquid separating efficiency is seriously reduced, after the liquid removing folded plate group is determined, the highest flow velocity of the gas-liquid mixture which can be processed can be determined, and the gas-liquid mixture which is lower than the highest flow velocity can be subjected to efficient gas-liquid separation, namely, the gas-liquid separator of the embodiment is compatible with all flow ranges of a fuel cell system downwards in principle under the condition of determining the highest operation flow, and can be operated efficiently in all working flow ranges;
the gas discharge section is provided with a metal woven net 209 and a gas collecting cavity 210, the metal woven net 209 is arranged above the liquid removing folded plate group, the gas collecting cavity 210 is arranged above the metal woven net 209, and the metal woven net 209 is used for removing small liquid drops in gas-liquid mixture airflow; the liquid separation efficiency of the gas-liquid separator can be improved and the diameter range of liquid drops in the air flow can be controlled by matching the liquid removal folding plate 208 with the metal woven net 209.
Further, a water level sensor 7 is arranged at the upper part of the liquid collecting cavity 204.
Preferably, the water level sensor 7 is a capacitive water level sensor.
Further, the gas-liquid separator further comprises a control unit, and the water level sensor 7 and the drain valve 8 are respectively electrically connected with the control unit;
the water level sensor 7 is used for detecting the water level in the liquid collecting cavity 204, transmitting a detection signal back to the control unit and performing on-off control on the drain valve 8 according to a preset threshold value;
specifically, when the water level of the liquid water stored in the liquid collecting chamber 204 reaches the sensing liquid level of the water level sensor 7, the control unit controls the drain valve 8 to be opened according to the received detection signal of the water level sensor 7, so as to discharge the liquid water in the liquid collecting chamber 204, and in order to avoid discharging the gas-liquid mixture due to the overlong opening time of the drain valve 8, the opening time of the drain valve 8 is determined according to the volume of the liquid water in the liquid collecting chamber 204.
Further, the top of the gas collecting cavity 210 is provided with a gas outlet 202, the upper part of the gas collecting cavity 210 is provided with a hydrogen concentration sensor 6, and the hydrogen concentration sensor 6 is used for detecting the volume concentration of the backflow hydrogen in the gas-liquid separator.
Further, the gas discharge section is also provided with a hydrogen discharge port 213, the hydrogen discharge port 213 is positioned on the side surface of the metal mesh grid 209, and the hydrogen discharge port 213 is provided with a hydrogen discharge valve 9.
Preferably, the hydrogen discharge valve 9 is a diaphragm type direct-acting electromagnetic valve, and does not need to be heated when working at the freezing temperature.
Further, in the liquid removal flap set, the distance between the adjacent liquid removal flaps 208 is 10-15 mm.
Further, as shown in fig. 5, the liquid removal flap 208 includes 2 to 4 bending structures, the width of each bending structure is 20 to 30mm, the depth of each bending structure is 10 to 15mm, and the cross-sectional shape is, but not limited to, a C shape (208 a) or a trapezoid shape (208 b).
Further, the liquid removal flap plate 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.
Further, an airflow uniform speed plate 207 is respectively arranged above and below the liquid removing folded plate group, and the airflow uniform speed plate 207 can be used for supporting the metal woven net 209 and enabling the gas-liquid mixture to uniformly enter the liquid removing folded plate group at the same flow rate.
Further, the liquid removal folded plate 208 is integrally formed by injection molding or 3D printing, and the gas-liquid separation partition plate 205 and the gas flow uniform velocity plate 207 are also integrally formed by injection molding or 3D printing; in order to ensure that the gas-liquid separation partition plate 205, the gas flow uniform velocity plate 207 and the liquid removal folded plate 208 can be tightly contacted with the cavity of the housing 211 during installation and are firmly installed, installation clamping grooves or buckles are arranged at installation positions in the cavity of the housing 211, and the gas-liquid separator partition plate 205, the gas flow uniform velocity plate 207 and the liquid removal folded plate 208 are installed inside the housing 211 in a clamping manner.
Further, the outer shape of the housing 211 may be a rectangular parallelepiped or a cylinder and a combination thereof, the cross section of the cavity of the housing 211 may be a square or a circle and a combination thereof, the housing 211 is made of one of stainless steel 304, stainless steel 316, PPS, PPA, POM, or a corrosion-resistant aluminum alloy 6061 subjected to surface anodization, and the processing method is mold injection, 3D printing, and the like.
Further, the lower part 2-1 of the gas-liquid separator, the gas inlet 201 and the gas-liquid separation partition 205 are integrally formed.
Further, the middle part 2-2 of the gas-liquid separator, the gas flow uniform velocity plate 207 and the liquid removal folded plate 208 are integrally processed, an installation position of the gas flow uniform velocity plate 207 is reserved above the liquid removal folded plate 208, and the number of the gas flow uniform velocity plate 207 can be increased according to needs.
Further, the detection range of the hydrogen concentration sensor 6 is 0-100%, the precision requirement is +/-1%, the reaction time is less than or equal to 1 second, the humidity meets 0-100% relative humidity, the working temperature range is-40-90 ℃, and a CAN2.0A/B communication mode is adopted.
Further, the hydrogen concentration sensor 6 and the hydrogen discharge valve 9 are electrically connected to the control unit, respectively.
Furthermore, each structure in the gas-liquid separator is installed in a clamping installation mode of a clamping groove or a clamping buckle, so that firm installation is guaranteed, and after the installation is finished, the gas-liquid separator is subjected to pressure maintaining test to ensure no leakage.
According to the principle of gas-liquid separation of the liquid removal folded plate 208 of the invention, as shown in fig. 5, due to different inertia forces of gas and liquid, after the gas-liquid mixture enters the liquid removal folded plate group, the gas-liquid mixture continues to flow forwards, when the gas-liquid mixture encounters bending, the gas density is low, the inertia force is small, the flow direction is easy to change, the gas can continue to flow along the bending direction, the liquid density is far greater than that of the gas, the inertia force is also large, when the gas-liquid mixture encounters bending, the flow direction is not easy to change, the gas-liquid mixture collides with the wall surface of the liquid removal folded plate 208 according to the original flow path and is gathered on the wall surface of the liquid removal folded plate 208, as the gas-liquid mixture continuously flows, liquid films are formed on the wall surface and are gathered into large liquid drops, and when the gravity of the liquid drops is greater than the drag force of the gas flow, the liquid drops can be gathered downwards into the liquid collection cavity 204.
The gas-liquid separation principle of the gas-liquid separator is shown in fig. 6, and the working process of the gas-liquid separator is as follows: the gas-liquid mixture gas flow flows into the liquid collecting cavity 204 through the gas inlet 201, the flow speed is greatly reduced, large liquid drops in the gas flow are blocked by the gas-liquid separation partition plate 205 under the action of gravity and enter the liquid collecting cavity 204, the gas flow crosses the gas-liquid separation partition plate 205, enters the cavity 206, flows upwards and redistributes the flow speed in the cavity 206, after passing through the gas flow velocity equalizing plate 207, the gas flow can uniformly flow into the flow channel formed by the liquid removing folded plate 208 at the same flow velocity, at the bending position of the liquid removing folded plate 208, due to the difference of gas-liquid inertia force, liquid drops in the gas flow collide with the wall surface of the liquid removing folded plate 208 and are gathered, and when the liquid drops are gathered to a certain size, the liquid drops fall off from the wall surface under the action of gravity and enter the liquid collecting cavity 204, after the airflow is subjected to 2-4 diversion collisions through the liquid removal folded plate group, 90% of droplets with the diameter larger than 40um in the airflow can be removed, the airflow continues to flow upwards and passes through the gas-liquid separation partition plate 205 and the metal woven mesh 209, in the process, droplets with low particle size which are not removed in the airflow collide with the metal woven mesh 209 and are gathered and fall into the liquid collection cavity 204, the airflow enters the gas collection cavity 210, the hydrogen concentration sensor 6 detects the airflow and transmits the detected hydrogen concentration value to the control unit, the control unit performs start-stop control on the hydrogen discharge valve 9 according to a preset threshold value, and when the hydrogen concentration value detected by the hydrogen concentration sensor is lower than the threshold value preset in the control unit, the control unit controls the hydrogen discharge valve 9 to start, the gas flow is discharged out of the gas-liquid separator through the hydrogen discharge port 213, the gas flow is discharged to improve the hydrogen concentration in order to make pure hydrogen enter, at this time, the mixed gas from which the liquid water is removed can meet the requirement of the reflux pump and the fuel cell on the content of the liquid water, and the mixed gas from which the liquid water is removed flows out of the gas-liquid separator through the gas outlet 202 and returns to the fuel cell to participate in the reaction after being pressurized.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A high-efficiency gas-liquid separator for hydrogen reflux of a proton exchange membrane fuel cell system, which is characterized in that,
the method comprises the following steps: the shell comprises a liquid collection section, an air inlet distribution section, a gas-liquid separation section and a gas discharge section from bottom to top;
the liquid collection section is provided with a liquid collection 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 folded plate group, the liquid removal folded plate group comprises a plurality of vertically arranged liquid removal folded plates, and the liquid removal folded plates are corrugated plates with a plurality of bending structures;
the gas emission section is provided with a metal woven mesh and a gas collection cavity, the metal woven mesh is arranged above the liquid removing folded plate group, and the gas collection cavity is arranged above the metal woven mesh.
2. The pem fuel cell system hydrogen return high efficiency gas-liquid separator according to claim 1 wherein said housing comprises a lower gas-liquid separator portion, a middle gas-liquid separator portion and an upper gas-liquid separator portion;
the liquid collecting section and the gas inlet distributing section are disposed in a lower portion of the gas-liquid separator, the gas-liquid separating section is disposed in a middle portion of the gas-liquid separator, and the gas discharging section is disposed in an upper portion of the gas-liquid separator.
3. The high-efficiency gas-liquid separator for hydrogen backflow of a proton exchange membrane fuel cell system according to claim 1, wherein a water outlet is arranged at the bottom of the liquid collection chamber, a water discharge valve is arranged on the water outlet, the top of the liquid collection chamber is open and is provided with a gas-liquid separation partition plate, and a water level sensor is arranged at the upper part of the liquid collection chamber.
4. The high-efficiency gas-liquid separator for the hydrogen backflow of the proton exchange membrane fuel cell system as claimed in claim 3, wherein an air outlet is arranged at the top of the gas collection cavity, and a hydrogen concentration sensor is arranged at the upper part of the gas collection cavity.
5. The high-efficiency gas-liquid separator for hydrogen backflow of a proton exchange membrane fuel cell system according to claim 4, wherein the gas discharge section is further provided with a hydrogen discharge port, the hydrogen discharge port is located on the side surface of the metal woven mesh, and the hydrogen discharge port is provided with a hydrogen discharge valve.
6. The high-efficiency gas-liquid separator for the hydrogen reflux of the proton exchange membrane fuel cell system as claimed in claim 4, wherein the detection range of the hydrogen concentration sensor is 0-100%, the precision requirement is +/-1%, the reaction time is less than or equal to 1 second, the humidity meets 0-100% relative humidity, the working temperature range meets-40-90 ℃, and a CAN2.0A/B communication mode is adopted.
7. The high-efficiency gas-liquid separator for hydrogen backflow of a proton exchange membrane fuel cell system according to claim 1, wherein in the liquid removal flap group, the distance between adjacent liquid removal flaps is 10-15 mm, the liquid removal flaps comprise 2-4 bending structures, the width of each bending structure is 20-30 mm, the depth of each bending structure is 10-15 mm, the liquid removal flaps are made of polymer materials, glass fiber reinforced materials corresponding to the polymer materials, stainless steel 304 or stainless steel 316, and the polymer materials are PPS, PPA, POM or PP.
8. The high-efficiency gas-liquid separator for hydrogen reflux of a proton exchange membrane fuel cell system as claimed in claim 1, wherein the material of the housing is stainless steel 304, stainless steel 316, PPS, PPA, POM, or surface anodized corrosion-resistant aluminum alloy 6061.
9. The high-efficiency gas-liquid separator for hydrogen backflow of a proton exchange membrane fuel cell system according to claim 1, wherein an air flow uniform velocity plate is respectively arranged above and below the liquid removal folded plate group.
10. The high-efficiency gas-liquid separator for hydrogen backflow of a proton exchange membrane fuel cell system according to claim 5, wherein 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 with the control unit respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211134308.6A CN115528277A (en) | 2022-09-16 | 2022-09-16 | Efficient gas-liquid separator for hydrogen reflux of proton exchange membrane fuel cell system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211134308.6A CN115528277A (en) | 2022-09-16 | 2022-09-16 | Efficient gas-liquid separator for hydrogen reflux of proton exchange membrane fuel cell system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115528277A true CN115528277A (en) | 2022-12-27 |
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| CN202211134308.6A Pending CN115528277A (en) | 2022-09-16 | 2022-09-16 | Efficient gas-liquid separator for hydrogen reflux of proton exchange membrane fuel cell system |
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