Drainage and exhaust device for air path of fuel cell

Abstract

The invention discloses a fuel cell air path drainage and exhaust device which comprises a shell and is characterized in that an inner cavity of the shell is divided into a first cavity and a second cavity by a partition plate, an inlet is formed in the top of the shell and communicated with the top of the first cavity, a plurality of drainage plates distributed in a staggered mode are arranged in the first cavity, and the drainage plates are communicated with the top of the second cavity. The multiple drainage plates and the inner wall of the first cavity jointly form a snakelike drainage channel, a drainage hole communicated with the second cavity is formed in a bottom plate of the first cavity, the longitudinal section of the second cavity is in an L shape, the second cavity is composed of a horizontal cavity and a vertical cavity which are communicated with each other, the drainage hole is located above the horizontal cavity, and the drainage hole is located above the vertical cavity. A bottom plate of the first cavity is connected with an air-water filter cartridge, the air-water filter cartridge is located in the horizontal cavity, the bottom of the vertical cavity is provided with a water outlet, the top of the vertical cavity is provided with an exhaust port, and the water outlet is provided with a first back pressure valve.

Description

Technical Field

[0001] The invention relates to the field of hydrogen fuel cells, in particular to a fuel cell air path hydrophobic exhaust device. Background Art

[0002] The air path system is an important subsystem in the fuel cell system, which can provide oxygen to the stack module. In the traditional air path system, the gas exhausted from the air path system is directly discharged from the fuel cell system, but this will reduce the gas utilization rate of the fuel cell system.

[0003] In order to improve the gas utilization rate of the fuel cell system, some manufacturers will input the gas discharged from the air path system into the energy recovery air compressor. Although this can improve the gas utilization rate, liquid water is not allowed to enter the turbocharger chamber of the energy recovery air compressor. The gas discharged from the air path system is rich in water. Therefore, this gas needs to be separated from the gas and liquid before the air with liquid water removed can be input into the energy recovery air compressor for use.

[0004] The common labyrinth or filling type gas-liquid separation device has limited separation effect, and the separated gas still contains a certain amount of moisture. When this air that has not been separated from the water enters the air compressor, it often causes air compressor failure, thereby affecting the normal operation of the fuel cell system.

[0005] Therefore, a method or device capable of solving the above problems is now needed. Summary of the invention

[0006] The present invention aims to solve the above-mentioned deficiencies in the prior art and proposes a fuel cell air path drain and exhaust device with simple structure, ingenious design, reasonable layout, good gas-water separation effect and high efficiency.

[0007] The technical solution of the present invention is: a fuel cell air path hydrophobic exhaust device, including a shell 1, characterized in that: the inner cavity of the shell 1 is divided into a first chamber 3 and a second chamber 4 by a partition 2, an inlet 5 is opened on the top of the shell 1, and the inlet 5 is connected to the top of the first chamber 3, and a plurality of staggered hydrophobic plates 6 are arranged in the first chamber 3, and the plurality of hydrophobic plates 6 and the inner wall of the first chamber 3 together form a serpentine hydrophobic channel, and a drainage hole 7 connected to the second chamber 4 is opened on the bottom plate of the first chamber 3, The longitudinal section of the second chamber 4 is L-shaped, and it consists of two parts: a horizontal cavity and a vertical cavity that are interconnected. The drainage hole 7 is located above the horizontal cavity. An air-water filter cartridge 8 is connected to the bottom plate of the first chamber 3. The air-water filter cartridge 8 is located in the horizontal cavity. A drainage port 9 is provided at the bottom of the vertical cavity, and an exhaust port 10 is provided at the top of the vertical cavity. A first back pressure valve 11 is provided at the drainage port 9.

[0008] The hydrophobic plate 6 is distributed obliquely, and its free end is relatively low.

[0009] The exhaust port 10 is provided with a second back pressure valve 12 .

[0010] Compared with the prior art, the present invention has the following advantages: The fuel cell air path hydrophobic exhaust device of this structural form has a simple structure, ingenious design, and reasonable layout. It is designed to solve the problems existing in the working process of the traditional gas-water separation device, and a special structure is designed. It allows the water-rich gas to pass through two chambers in turn. In the first chamber, a serpentine channel is formed by a plurality of staggered hydrophobic plates, and the contact time between the air and the hydrophobic plates is increased as much as possible, so as to achieve the purpose of condensing the water-rich air into liquid water. In the second chamber, an air-water filter cartridge is provided, which can further perform air-water separation operation on the gas that has undergone one air-water separation, so as to achieve a better water separation effect. The air after the double water separation treatment can be directly supplied to the air compressor to achieve the purpose of improving the gas utilization rate. The manufacturing process of this hydrophobic exhaust device is simple and the manufacturing cost is low. Therefore, it can be said that it has many advantages and is particularly suitable for promotion and application in this field. Its market prospects are very broad. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the three-dimensional structure of an embodiment of the present invention.

[0012] Figure 2 It is a schematic diagram of the three-dimensional structure (cross-section view) of an embodiment of the present invention.

[0013] Figure 3 It is a front view (cross-section) of an embodiment of the present invention.

[0014] Figure 4 yes Figure 3 AA section view in. DETAILED DESCRIPTION

[0015] The specific implementation of the present invention will be described below with reference to the accompanying drawings. Figures 1 to 4As shown: A fuel cell air path hydrophobic exhaust device includes a shell 1, characterized in that: the inner cavity of the shell 1 is divided into a first chamber 3 and a second chamber 4 by a partition 2, an inlet 5 is opened on the top of the shell 1, and the inlet 5 is connected to the top of the first chamber 3, a plurality of staggered hydrophobic plates 6 are arranged in the first chamber 3, and the plurality of hydrophobic plates 6 and the inner wall of the first chamber 3 together form a serpentine hydrophobic channel, and a drainage hole 7 connected to the second chamber 4 is opened on the bottom plate of the first chamber 3, The longitudinal section of the second chamber 4 is L-shaped, and it consists of two parts: a horizontal cavity and a vertical cavity that are interconnected. The drainage hole 7 is located above the horizontal cavity. An air-water filter cartridge 8 is connected to the bottom plate of the first chamber 3. The air-water filter cartridge 8 is located in the horizontal cavity. A drainage port 9 is provided at the bottom of the vertical cavity, and an exhaust port 10 is provided at the top of the vertical cavity. A first back pressure valve 11 is provided at the drainage port 9.

[0016] The hydrophobic plate 6 is distributed obliquely, and its free end is relatively low.

[0017] The exhaust port 10 is provided with a second back pressure valve 12 .

[0018] The working process of the fuel cell air path dewatering and exhausting device of the embodiment of the present invention is as follows: the inlet 5 of the device is connected to the air outlet pipeline in the fuel cell system, and the exhaust port 10 of the device is connected to the inlet pipeline of the air compressor. The air exhausted from the fuel cell system enters the first chamber 3 through the inlet 5, and the air moves in the serpentine hydrophobic channel formed by the hydrophobic plate 6 and the inner wall of the first chamber 3. During the movement, the water-rich air fully contacts the multiple hydrophobic plates 6, and a part of the water condenses to form liquid water, which gathers at the bottom of the first chamber 3 together with the liquid water originally in the air, and finally is discharged into the second chamber 4 through the drainage hole 7. That is to say, the air undergoes the first gas-water separation in the first chamber 3; The air that has undergone the first gas-water separation will enter the gas-water filter cartridge 8, and undergo a further second gas-water separation therein. The dry gas that has passed through the gas-water filter cartridge 8 will be directly discharged through the exhaust port 10 (entering the air compressor), and the liquid water discharged from the gas-water filter cartridge 8 will be gathered at the bottom of the shell 1 with the liquid water that enters the second chamber 4 from the first chamber 3. After working for a period of time, the first back pressure valve 11 is controlled to open by the control system, and the liquid water is discharged through the drain port 9, thereby realizing the gas-water separation and gas reuse of the gas at the exhaust end of the fuel cell system.

[0019] It should be noted that, although in theory a part of the gas will bypass the gas-water filter cartridge 8 through the drain hole 7 and directly enter the second chamber 4, in reality, there is liquid water in the drain hole 7 most of the time, and the liquid water can seal it to prevent the gas from directly entering the second chamber. In addition, since the aperture of the connection between the first chamber 3 and the second chamber 4 is much larger than the aperture of the drain hole 7, the gas will preferentially enter the second chamber 4 through the above-mentioned connection. Similarly, since the aperture of the drain hole 7 is small, even if a part of the gas enters the second chamber 4 through the drain hole 7, it will not have a substantial impact on the gas-water separation effect of the device.

Claims

1. A fuel cell air path dehumidification and exhaust device, comprising a housing (1), characterized in that: The inner cavity of the shell (1) is divided into a first chamber (3) and a second chamber (4) by a partition (2). An inlet (5) is provided on the top of the shell (1), and the inlet (5) is connected to the top of the first chamber (3). A plurality of staggered hydrophobic plates (6) are arranged in the first chamber (3). The plurality of hydrophobic plates (6) and the inner wall of the first chamber (3) together form a serpentine hydrophobic channel. A drainage hole (7) connected to the second chamber (4) is provided on the bottom plate of the first chamber (3). The second chamber (4) has an L-shaped longitudinal section and is composed of a horizontal chamber and a vertical chamber that are interconnected. The drainage hole (7) is located above the horizontal chamber. An air-water filter cartridge (8) is connected to the bottom plate of the first chamber (3). The air-water filter cartridge (8) is located in the horizontal chamber. A drainage port (9) is provided at the bottom of the vertical chamber, and an exhaust port (10) is provided at the top of the vertical chamber. A first back pressure valve (11) is provided at the drainage port (9).

2. The fuel cell air path drain and exhaust device according to claim 1, characterized in that: The hydrophobic plate (6) is distributed obliquely, and its free end is relatively low.

3. The fuel cell air path drain and exhaust device according to claim 1, characterized in that: A second back pressure valve (12) is provided at the exhaust port (10).

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