Tail gas-liquid separation device for fuel cell

Abstract

The utility model discloses a tail gas gas-liquid separation device for a fuel cell, which comprises a separator, two ends of the separator are respectively connected with a gas inlet frame and a gas exhaust frame, and a liquid collection component is arranged in the middle of the separator. Water flow is guided into a primary separation space formed by the air inlet frame and the separator from one side of the air inlet frame, and under the action of gravity, stranded water flow and large liquid drops directly settle to the bottom of the air inlet frame and are further guided into a water storage box through a flow guide hole; meanwhile, the gas and the suspended droplets blocked by the pressing plate are turned back to enter the separation cavity from a channel at the upper part of the pressing plate to be further guided, the suspended droplets are captured by the filler, continuously condensed and enlarged and finally fall and are guided into the water storage box, and a very small amount of droplets can be brought out of the separation cavity by the airflow and enter a small cavity of the exhaust frame; and finally, the liquid collected in the water storage box is discharged through the drainage electromagnetic valve.

Description

TECHNICAL FIELD

[0001] The utility model relates to gas -liquid separation equipment related technical field especially relates to a tail gas gas -liquid separation device for fuel cell. BACKGROUND

[0002] With the technical progress of hydrogen fuel cell industry in our country, hydrogen fuel cell system develops rapidly to high power, and single system power reaches 120kw or even above 200kw. With the increase of system power, how to reduce parasitic power and improve system efficiency becomes a new challenge. Among all fuel cell BOPs, the power required by the air compressor is the highest, and with the development of the system to high power, the parasitic power of the air compressor will increase significantly. In order to reduce the parasitic power consumption of the air compressor, the industry currently generally chooses to use turbine energy recovery air compressor products, which use the principle of turbine expansion to recover part of the energy in the exhaust gas discharged from the stack.

[0003] The water generated in the internal reaction of hydrogen fuel cell system is mainly on the cathode side. Liquid water, water vapor and unreacted air are discharged through tail discharge, resulting in a large amount of water in the tail gas. According to the working principle of turbine, the liquid water and impurities in the recovered gas will cause damage to the turbine blades, affecting the service life of the turbine air compressor. Therefore, it is very important to separate and filter the liquid water and impurities in the tail gas before it enters the expander. However, the existing equipment is difficult to separate the water in the tail gas, or the overall gas-liquid separation effect is poor. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a tail gas gas-liquid separation device for fuel cell to solve the problems of a large amount of water in the tail gas in hydrogen fuel cell system, and the existing equipment is difficult to separate the water in the tail gas, or the overall gas-liquid separation effect is poor.

[0005] To achieve the above purpose, the utility model provides the following technical scheme: a tail gas gas-liquid separation device for fuel cell, comprising a separator, the separator is connected with an air inlet frame and an air outlet frame at both ends respectively, a liquid collecting assembly is arranged in the middle of the separator, a water storage assembly is connected in communication at the bottom of the liquid collecting assembly, and a liquid discharge assembly is connected in communication with the water storage assembly.

[0006] As a preferred, the air inlet frame and the air outlet frame are both funnel-shaped, and the air inlet frame is higher than the air outlet frame.

[0007] As a preferred, the liquid collecting assembly comprises a separation cavity arranged in the middle of the separator, a plurality of liquid drainage grooves are formed at the bottom of the separation cavity, a filler is filled in the middle of the separation cavity, a pressing plate is arranged on the side of the separation cavity close to the air inlet frame, and a protective net is arranged on the side of the separation cavity close to the air outlet frame.

[0008] Preferably, the pressing plate is provided with a cross-shaped baffle corresponding to the separation cavity, and the bottom of the pressing plate is provided with a plurality of flow guide holes.

[0009] Preferably, the top of the separator is symmetrically provided with a fixing frame, the bottom of the separator is provided with a flow guide opening communicated with the water storage assembly, the side of the separator located at the flow guide opening is provided with a backflow groove, and the two ends and the bottom of the separator are provided with mounting grooves, and the mounting grooves are provided with sealing rings.

[0010] Preferably, the water storage assembly comprises a water storage box connected to the bottom of the separator, and the bottom of the water storage box is provided with a liquid outlet.

[0011] Preferably, the side walls of the separator and the water storage box are provided with liquid level sensors, and the bottom of the water storage box is provided with a plurality of mounting columns.

[0012] Preferably, the liquid discharge assembly comprises a water drainage electromagnetic valve fixed to the mounting column, and the water inlet of the water drainage electromagnetic valve is communicated with the liquid outlet.

[0013] The utility model discloses the beneficial effects of:

[0014] 1. The gas-liquid mixed gas in the hydrogen fuel cell system is guided from the one side of the air inlet frame to the first separation space formed by the air inlet frame and the separator, under the action of gravity, the water flow and large liquid drops will directly settle to the bottom of the air inlet frame, and under the action of pressure difference, will be further guided to the water storage box through the flow guide hole; at the same time, the gas and small liquid drops suspended in the air are blocked by the pressing plate, and will re-enter the separation cavity from the channel on the upper part of the pressing plate and be further guided, at this time, the small liquid drops suspended in the air will be captured by the filler, and will be gradually condensed and enlarged and finally fall and be guided to the water storage box, and a small amount of small water drops may be taken out of the separation cavity by the gas flow, enter the small cavity of the air outlet frame and be returned to the water storage box through the backflow groove, and finally the liquid collected in the water storage box is discharged through the water drainage electromagnetic valve, thereby conveniently realizing the separation operation of the gas-liquid mixed gas in the system.

[0015] 2. By arranging the pressing plate and the protective net on the two sides of the separation cavity respectively, the filler filled in the separation cavity is tightly pressed by the pressing plate and the protective net, the small liquid drops suspended in the air are captured by the filler and gradually condensed and enlarged, and are guided to the water storage box through the liquid leakage groove, thereby improving the gas-liquid separation effect of the tail gas.

[0016] 3. When the liquid level in the water storage box rises and is detected by the high liquid level sensor on the side wall of the separator, the water drainage electromagnetic valve will be opened through the system control to carry out the water drainage operation, when the water is drained to the position of the low liquid level sensor on the side wall of the water storage box, the accumulated water in the water storage box is drained, the system will control the water drainage electromagnetic valve to be closed, and the electromagnetic valve has a heating function, can melt ice when starting at low temperature, thereby ensuring the rapid starting of the system.

[0017] 4. The device has compact structure, good separation effect, small pressure loss, ensures energy recovery efficiency of turbine air compressor, accurately controls displacement, ensures all gas enters into expander, improves energy recovery efficiency, filler and protective net have functions of filtering impurities and protecting expander. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a three-dimensional structure schematic diagram of the embodiment of the utility model;

[0019] Figure 2 It is a sectional three-dimensional structure schematic diagram of the embodiment of the utility model;

[0020] Figure 3 It is an enlarged structure schematic diagram of A of the embodiment of the utility model;

[0021] Figure 4 It is an enlarged structure schematic diagram of B of the embodiment of the utility model.

[0022] In the drawing: 1, separator; 2, air inlet frame; 3, air outlet frame; 4, liquid collecting assembly; 41, separation cavity; 42, liquid drainage groove; 44, pressing plate; 441, cross baffle; 442, flow guide hole; 45, protective net; 5, water storage assembly; 51, water storage box; 52, liquid discharge port; 6, liquid discharge assembly; 61, water drainage electromagnetic valve; 7, fixing frame; 8, flow guide port; 9, backflow groove; 10, mounting groove; 11, sealing ring; 12, liquid level sensor; 13, mounting column. DETAILED DESCRIPTION

[0023] The technical scheme in the embodiments of the utility model will be described clearly and completely below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0024] Please refer to Figures 1 to 4The utility model provides a kind of tail gas gas-liquid separation device for fuel cell, including separator 1, the separator 1 two ends are connected with air inlet frame 2 and exhaust frame 3 respectively is equipped with, the separator 1 middle part is equipped with liquid collection component 4, the bottom of liquid collection component 4 is connected with water storage component 5, water storage component 5 is connected with liquid discharge component 6, gas-liquid mixed gas in hydrogen fuel cell system, from the air inlet frame 2 side diversion to the first separation space formed by air inlet frame 2 and separator 1, under the action of gravity, water flow and large droplet will directly settle to the bottom of air inlet frame 2, and under the action of pressure difference, will be further guided to water storage component 5 by diversion hole 442;While gas and suspended small droplet blocked by pressing plate 44, will turn back from the passage of the upper portion of pressing plate 44 into separation cavity 41 and be further guided, small droplet suspended at this time will be captured by filler (not drawn in the figure) in liquid collection component 4, and constantly condense and grow up and finally fall and guide to water storage component 5, while a small amount of water droplet can be carried out separation cavity 41 by airflow, into the small cavity of exhaust frame 3, and backflow to water storage component 5 by backflow groove 9 opened in the bottom wall of separator 1, finally, the liquid collected in water storage component 5 is discharged by liquid discharge component 6, and then the gas-liquid mixed gas separation operation in system is conveniently realized.

[0025] As Figure 1 Indicated, specifically, the air inlet frame 2 and the exhaust frame 3 are funnel-shaped, the air inlet frame 2 is higher than the exhaust frame 3, by setting air inlet frame 2 and exhaust frame 3 funnel-shaped, gas-liquid mixed gas flows from the narrow pipeline of air inlet frame 2 to the expanded pipeline, and then by the expansion and speed reduction effect of first separation space, it is beneficial to the settlement of droplet and the filtration and flow guiding effect of gas-liquid mixed gas.

[0026] As Figure 2 And Figure 3 Indicated, specifically, the liquid collection component 4 includes separation cavity 41 provided in the middle part of the separator 1, a plurality of liquid drainage grooves 42 are opened in the bottom of the separation cavity 41, filler is filled in the middle part of the separation cavity 41, pressing plate 44 is provided on the side of the separation cavity 41 close to the air inlet frame 2, and protective net 45 is provided on the side of the separation cavity 41 close to the exhaust frame 3, by setting pressing plate 44 and protective net 45 on the two sides of separation cavity 41, and then the filler filled into separation cavity 41 is abutted by pressing plate 44 and protective net 45, it is convenient for small droplet suspended in separation cavity 41 from the passage of the upper portion of pressing plate 44 to be captured by filler, gradually condense and grow up, and guided to water storage box 51 by liquid drainage groove 42, improve the effect of gas-liquid separation in tail gas.

[0027] Specifically, the filler is stainless steel gas-liquid filter screen, or other material with trapping and separating effect.

[0028] As Figure 4As shown, in particular, the pressing plate 44 is provided with a cross baffle 441 corresponding to the separation cavity 41, and the bottom of the pressing plate 44 is provided with a plurality of flow guide holes 442. The cross baffle 441 cooperates with the protective net 45 to realize the abutting of the filler filled into the separation cavity 41, and the water settled in the first separation space is guided to the water storage box 51 through the flow guide holes 442.

[0029] In particular, the top of the separator 1 is symmetrically provided with a fixing frame 7, the bottom of the separator 1 is provided with a flow guide opening 8 communicating with the water storage assembly 5, one side of the separator 1 is provided with a backflow groove 9 at the flow guide opening 8, and the two ends and the bottom of the separator 1 are provided with mounting grooves 10. The mounting grooves 10 are sleeved with sealing rings 11. The symmetrically arranged fixing frame 7 facilitates the fixed installation of the separator 1. The flow guide opening 8 arranged at the bottom of the separator 1 facilitates the flow of the separated water to the water storage box 51 for collection. The sealing ring 11 improves the air tightness of the whole device.

[0030] In particular, the water storage assembly 5 includes the water storage box 51 connected to the bottom of the separator 1. The bottom of the water storage box 51 is provided with a liquid outlet 52. The water storage box 51 collects a large amount of water in the gas-liquid mixed gas, and the liquid outlet 52 is communicated with the water inlet of the drain electromagnetic valve 61. By controlling the opening and closing of the drain valve, the collected water in the water storage box 51 is discharged.

[0031] In particular, the separator 1 and the side wall of the water storage box 51 are both provided with liquid level sensors 12, and the bottom of the water storage box 51 is provided with a plurality of mounting columns 13. By installing liquid level sensors 12 on the bottom of the separator 1 and the water storage box 51, the liquid level change of the liquid collected in the bottom of the separator 1 and the water storage box 51 can be monitored in real time, and then discharged further through the drain electromagnetic valve 61.

[0032] In particular, the drain assembly 6 includes the drain electromagnetic valve 61 fixedly arranged on the mounting column 13. The water inlet of the drain electromagnetic valve 61 is communicated with the liquid outlet 52. When the liquid level in the water storage box 51 rises and is detected by the high liquid level sensor 12 on the side wall of the separator 1, the drain electromagnetic valve 61 will be opened by the system control to perform the drainage operation. When the water is drained to the position of the low liquid level sensor 12 on the side wall of the water storage box 51, the accumulated water in the water storage box 51 is drained, and the system will control the drain electromagnetic valve 61 to be closed. The electromagnetic valve has a heating function, which can melt ice when started at low temperature, thereby ensuring the rapid start of the system and improving the effect of gas-liquid separation.

[0033] In particular, the drain electromagnetic valve 61 is a prior art, and thus is not described here.

[0034] The utility model discloses a working principle: when using, the gas-liquid mixed gas in hydrogen fuel cell system is guided from the one side of air intake frame 2 to the first separation space formed by air intake frame 2 and separator 1 under the action of gravity, and the water flow and big liquid drop will directly settle to the bottom of air intake frame 2, and under the action of pressure difference, will be guided to water storage box 51 through the flow guide hole 442 further, and the gas and the small liquid drop suspended are blocked by pressing plate 44, and will turn back from the passage in the upper portion of pressing plate 44 and enter separation chamber 41 and be guided further, at this time, the small liquid drop suspended will be trapped by the filler, and the small water drop possibly taken out separation chamber 41 by the airflow and enters the small cavity of exhaust frame 3 and is returned to water storage box 51 through backflow groove 9, and finally, the liquid collected in water storage box 51 is discharged through the water drainage electromagnetic valve 61, and the separation operation of the gas-liquid mixed gas in the system is realized conveniently.

[0035] The above only is the preferred embodiment of the utility model, and does not use to limit the utility model, and any modification, equivalent replacement or improvement etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A gas-liquid separation device for fuel cell exhaust gas, comprising a separator (1), characterized in that: The separator (1) is connected to an air intake frame (2) and an exhaust frame (3) at both ends respectively. The separator (1) is provided with a liquid collection component (4) in the middle. The bottom of the liquid collection component (4) is connected to a water storage component (5). The water storage component (5) is connected to a drain component (6).

2. The fuel cell exhaust gas-liquid separation device according to claim 1, characterized in that: Both the air intake frame (2) and the exhaust frame (3) are funnel-shaped, with the air intake frame (2) being higher than the exhaust frame (3).

3. The fuel cell exhaust gas-liquid separation device according to claim 1, characterized in that: The liquid collection assembly (4) includes a separation chamber (41) in the middle of the separator (1). Several draining grooves (42) are opened at the bottom of the separation chamber (41). The middle of the separation chamber (41) is filled with packing material. A pressure plate (44) is provided on the side of the separation chamber (41) near the air inlet frame (2). A protective net (45) is provided on the side of the separation chamber (41) near the exhaust frame (3).

4. The fuel cell exhaust gas-liquid separation device according to claim 3, characterized in that: The pressure plate (44) is provided with a cross baffle (441) corresponding to the separation chamber (41), and the bottom of the pressure plate (44) is provided with a plurality of guide holes (442).

5. The fuel cell exhaust gas-liquid separation device according to claim 1, characterized in that: The separator (1) is symmetrically provided with a fixing frame (7) at the top. The bottom of the separator (1) is connected to the water storage component (5) and has a flow guide (8). The separator (1) is provided with a return groove (9) on one side of the flow guide (8). The separator (1) has installation grooves (10) at both ends and at the bottom. The installation groove (10) is fitted with a sealing ring (11).

6. The fuel cell exhaust gas-liquid separation device according to claim 1, characterized in that: The water storage component (5) includes a water storage box (51) connected to the bottom of the separator (1), and the bottom of the water storage box (51) is provided with a drain port (52).

7. The fuel cell exhaust gas-liquid separation device according to claim 6, characterized in that: The separator (1) and the water storage box (51) are both equipped with liquid level sensors (12) on their side walls, and the bottom of the water storage box (51) is equipped with several mounting columns (13).

8. The fuel cell exhaust gas-liquid separation device according to claim 7, characterized in that: The drainage assembly (6) includes a drainage solenoid valve (61) fixedly mounted on the mounting column (13), and the inlet of the drainage solenoid valve (61) is connected to the drainage port (52).

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