A fuel cell power system low temperature start system

Abstract

The utility model provides a kind of fuel cell power generation system low temperature starting system, belong to fuel cell field, the hot air after using air compressor is heated to the current collector plate and air cavity of both ends of electric pile, promote electric pile temperature;Air circulation between electric pile box and BOP box, through air heating in box, ice melting of circulating pump, solenoid valve and other components freezing site, so that component can normally work.The technical scheme includes electric pile box and BOP box;Electric pile box is sealed box, and first temperature sensor and first pressure sensor are arranged in electric pile box;Electric pile box has electric pile;BOP box is sealed box, and second temperature sensor is arranged in BOP box;Air compressor is arranged in BOP box, and air compressor is connected with electric pile by first air supply pipeline;Second air supply pipeline is further arranged in electric pile box, second air supply pipeline is arranged on first air supply pipeline, and second air supply pipeline is divided into two branches and blows air to current collector plate on both sides of electric pile respectively.

Description

Technical Field

[0001] This utility model belongs to the field of fuel cells, and in particular relates to a low-temperature start-up system for a fuel cell power generation system. Background Technology

[0002] Currently, when the ambient temperature is below -40℃, especially close to -50℃, fuel cell power generation systems face difficulties starting up due to factors such as icing inside the membrane electrode assembly, poor performance of single cells near the stack endplates, difficulty in breaking ice with the hydrogen circulation pump, and abnormal solenoid valve function.

[0003] In existing technologies, high-temperature air compressed by an air compressor is circulated and compressed to provide high-temperature air for fuel cell power generation. Although this approach enables the fuel cell air to heat up quickly and reach the required normal operating temperature, it cannot improve the performance of individual cells near the stack endplates and the low-temperature start-up performance of the BOP (Balance of Plant). Summary of the Invention

[0004] To address the technical problems existing in the background art, the first aspect of this utility model provides a low-temperature start-up system for a fuel cell power generation system. This system uses hot air from an air compressor to heat the current collectors and air chamber at both ends of the fuel cell stack, thereby increasing the stack temperature. Air circulates between the fuel cell stack housing and the BOP housing. By heating the air inside the housing, ice is melted from the icy parts of components such as the circulation pump and solenoid valve, enabling the components to operate normally.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A low-temperature start-up system for a fuel cell power generation system includes a fuel cell stack housing and a BOP housing; the fuel cell stack housing is a sealed housing, and a first temperature sensor and a first pressure sensor are installed inside the fuel cell stack housing; the fuel cell stack is located inside the fuel cell stack housing. The BOP enclosure is a sealed enclosure, and a second temperature sensor is installed inside the BOP enclosure; an air compressor is installed inside the BOP enclosure, and the air compressor is connected to the fuel cell stack through a first air supply pipeline; The fuel cell stack housing is also equipped with a second air supply line, which is located on the first air supply line. The second air supply line is divided into two branches to blow air onto the collector plates on both sides of the fuel cell stack.

[0006] In one embodiment, a second proportional valve and a third temperature sensor are provided on the first air supply line. The second proportional valve is located on the side closer to the fuel cell stack, and the third temperature sensor is located on the side closer to the air compressor.

[0007] In one embodiment, the second air supply line is located between the second proportional valve and the third temperature sensor.

[0008] In one embodiment, the fuel cell stack housing and the BOP housing are respectively provided with a first opening on the fuel cell stack side and a first opening on the BOP side. The two openings are connected by a first pipeline, and a first fan and a first switching valve are provided on the first pipeline.

[0009] In one embodiment, a second opening on the fuel cell stack housing and a second opening on the BOP housing are respectively provided on the fuel cell stack side and the BOP side. The two openings are connected by a second pipeline, and a second switching valve is provided on the second pipeline.

[0010] In one implementation, the exhaust port of the fuel cell stack is connected to a third pipeline, and a third switching valve is installed on the third pipeline.

[0011] In one embodiment, a fourth opening is provided on the fuel cell stack housing, the fourth opening is connected to a fourth pipeline, and a fourth switching valve and a second fan are provided on the fourth pipeline.

[0012] In one embodiment, a fifth opening is provided on the BOP housing, a fifth pipeline is fixed in the fifth opening, and a fifth switch valve is provided on the fifth pipeline.

[0013] In one embodiment, a sixth opening is provided on the BOP housing, the sixth opening is connected to a sixth pipeline, and the air compressor is connected to an air filter device through the sixth pipeline.

[0014] In one embodiment, the air filtration device is located outside the BOP enclosure.

[0015] The beneficial effects of this utility model are: 1) The hot air from the air compressor heats the current collectors and air chamber at both ends of the fuel cell stack, raising the stack temperature; the air circulates between the fuel cell stack housing and the BOP housing, and the heating of the air inside the housing melts the ice on the parts of the circulating pump, solenoid valve and other components, enabling the components to work normally.

[0016] 2) The air temperature is regulated by an air temperature control device and monitored by a temperature sensor to prevent the air temperature blowing onto the current collector and the fuel cell stack air cavity from being too high and damaging the fuel cell stack.

[0017] 3) Temperature sensors are installed in the fuel cell stack enclosure and BOP enclosure to prevent the enclosure temperature from becoming too high and causing damage to components.

[0018] 4) A pressure sensor is installed in the fuel cell stack housing to prevent excessive pressure inside the housing from damaging components.

[0019] Advantages of the present invention in additional aspects will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0022] The components include: 1. Fuel cell stack housing; 2. BOP housing; 3. First temperature sensor; 4. Second temperature sensor; 5. Third temperature sensor; 6. First pressure sensor; 7. Second pressure sensor; 8. First air supply line; 9. Second air supply line; 10. Air compressor; 11. Solenoid valve and other components; 12. Air filter; 13. Air temperature control device; 14. Fuel cell stack; 15. First proportional valve; 16. Second proportional valve; 101. First fan; 102. Second fan; 201. First switching valve; 202. Second switching valve; 203. Third switching valve; 204. Fourth switching valve; 205. Fifth switching valve; 206. Sixth switching valve; 301. First pipeline; 302. Second pipeline; 303. Third pipeline; 304. Fourth pipeline; 305. Fifth pipeline; 306. Sixth pipeline. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0025] 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 exemplary embodiments according to the present 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.

[0026] In this utility model, terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "side", and "bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to facilitate the description of the structural relationship between the various components or elements of this utility model and do not specifically refer to any component or element in this utility model. They should not be construed as limiting this utility model.

[0027] In this utility model, terms such as "fixed connection," "connected," and "joined" should be interpreted broadly, indicating a fixed connection, an integral connection, or a detachable connection; a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in this utility model can be determined according to the specific circumstances, and should not be construed as a limitation of this utility model.

[0028] Terminology Explanation: Hydrogen fuel cell: an energy conversion device that converts the chemical energy of hydrogen into electrical energy.

[0029] The fuel cell stack consists of membrane electrode assemblies, bipolar plates, current collectors, end plates, seals, fasteners, etc., and is the main component for fuel cell power generation.

[0030] Fuel cell power generation system: A device that uses hydrogen and air to generate electricity, consisting of a fuel cell stack, an air supply system, a hydrogen supply system, a cooling system, an electrical system, etc.

[0031] Example 1 This embodiment provides a low-temperature start-up system for a fuel cell power generation system, such as... Figure 1 As shown, it includes: a fuel cell stack housing 1 and a BOP housing 2; the fuel cell stack housing 1 is a sealed housing, and a first temperature sensor 3 and a first pressure sensor 6 are installed inside the fuel cell stack housing 1 to detect the temperature data and pressure data of the fuel cell stack housing 1, respectively; the fuel cell stack housing 1 contains a fuel cell stack 14; the BOP housing 2 is a sealed housing, and a second temperature sensor 4 is installed inside the BOP housing 2 to detect the temperature of the BOP housing 2; an air compressor 10 is installed inside the BOP housing 2, and the air compressor 10 is connected to the fuel cell stack 14 through a first air supply line 8; a second air supply line 9 is also installed inside the fuel cell stack housing 1, and the second air supply line 9 is installed on the first air supply line 8, and the second air supply line 9 is divided into two branches to blow air onto the manifolds on both sides of the fuel cell stack 14.

[0032] In a specific embodiment, the BOP housing 2 houses an air compressor 10, an air temperature control device 13, and other components 11 such as a solenoid valve. The air compressor 10 is connected to the fuel cell stack 14 via a first air supply line 8. The air temperature control device 13 is mounted on the first air supply line 8. A third temperature sensor 5, a second proportional valve 16, and a second pressure sensor 7 are sequentially mounted on the first air supply line 8 within the fuel cell stack housing 1. The second pressure sensor 7 is located near the fuel cell stack 14 and is used to detect the air pressure entering the fuel cell stack 14. The third temperature sensor 5 is used to detect the temperature data of the air supplied by the air compressor 10.

[0033] In a specific implementation, a second air supply line 9 is also provided inside the fuel cell stack housing 1. The second air supply line 9 is located on the first air supply line 8 and between the second proportional valve 16 and the third temperature sensor 5. The second air supply line 9 is divided into two branches that blow air onto the manifolds on both sides of the fuel cell stack 14 to increase the temperature of the fuel cell stack 14.

[0034] In a specific implementation, the fuel cell stack housing 1 and the BOP housing 2 are respectively provided with a first opening on the fuel cell stack 14 side and a first opening on the BOP side. The two openings are connected by a first pipeline 301. A first fan 101 and a first switching valve 201 are provided on the first pipeline 301. The opening and closing of the first switching valve 201 are used to control whether the fuel cell stack housing 1 and the BOP housing 2 are connected.

[0035] In a specific implementation, a second opening on the fuel cell stack housing 1 and a second opening on the BOP housing 2 are respectively provided on the fuel cell stack side and the BOP side. The two openings are connected by a second pipeline 302. A second switching valve 202 is provided on the second pipeline 302. The opening and closing of the second switching valve 202 is used to control whether the fuel cell stack housing 1 and the BOP housing 2 are connected.

[0036] Furthermore, the first switch valve 201 opens, the second switch valve 202 opens, the first blower 101 runs, and air circulates between the fuel cell stack housing 1 and the BOP housing 2.

[0037] In a specific implementation, the exhaust port of the fuel cell stack 14 is connected to a third pipeline 303. A second proportional valve 16 and a third switching valve 203 are provided on the third pipeline 303. The third switching valve 203 is used to discharge the air that enters the fuel cell stack 14 through the second proportional valve 16.

[0038] In a specific implementation, a fourth opening is provided on the fuel cell stack housing 1, the fourth opening is connected to a fourth pipeline 304, a fourth switching valve 204 and a second fan 102 are provided on the fourth pipeline 304, the opening and closing of the fourth switching valve 204 are used to control the connection or disconnection between the fuel cell stack housing 1 and the atmospheric environment.

[0039] In a specific implementation, a fifth opening is provided on the BOP housing 2, a fifth pipeline 305 is fixed to the fifth opening, and a fifth switch valve 205 is provided on the fifth pipeline 305. The opening and closing of the fifth switch valve 205 is used to control the connection or disconnection between the BOP housing 2 and the atmospheric environment.

[0040] Furthermore, the fourth switch valve 204 opens, the second fan 102 runs, and air is discharged from the stack housing 1; the fifth switch valve 205 opens, the fourth switch valve 204 opens, the second fan 102 runs, and air enters the BOP housing 2 from the atmospheric environment.

[0041] In a specific implementation, a sixth opening is provided on the BOP housing 2, and the sixth opening is connected to a sixth pipeline 306. The air compressor 10 is connected to the air filter device 12 through the sixth pipeline 306. The air filter device is installed outside the BOP housing 2. A sixth switching valve 206 is provided on the sixth pipeline 306 for connecting or disconnecting the air compressor 10 and the air filter device 12.

[0042] Furthermore, the sixth switch valve 206 opens, the air compressor 10 operates, and atmospheric air enters the air compressor 10 through the air filter device 12. The hot air blown out of the air compressor 10 is split into two paths after passing through the air temperature control device 13. One path passes through the first proportional valve 15 to blow onto the surface of the collector plates at both ends of the fuel cell stack 14, heating the collector plates, and then flows into the fuel cell stack housing 1; the other path passes through the second proportional valve 16 to heat the air cavity of the fuel cell stack 14. The third switch valve 203 opens, and the heated air cavity is discharged into the fuel cell stack housing 1. The third temperature sensor 5 is used to monitor the air temperature after passing through the air temperature control device 13, and the second pressure sensor 7 is used to monitor the air pressure entering the fuel cell stack 14. The opening degree of the first proportional valve 15 and the second proportional valve 16 can control the air flow rate.

[0043] Working principle of this utility model: Before the fuel cell power generation system starts, switch valves 201 and 202 are opened, fan 101 runs, and air circulates between the fuel cell stack housing 1 and the BOP housing 2. The sixth switch valve 206 opens, the first proportional valve 15 opens fully, the second proportional valve 16 closes, the air compressor 10 runs, and the temperature control device adjusts the value monitored by the third temperature sensor 5 to T1, heating the manifolds on both sides of the fuel cell stack 14. The heated air circulates between the fuel cell stack housing 1 and the BOP housing 2, heating the air inside both housings and melting ice buildup on components such as the circulation pump and solenoid valves.

[0044] When the value monitored by the first temperature sensor 3 or the second temperature sensor 4 is greater than T2, the temperature control device is adjusted to adjust the value monitored by the third temperature sensor 5 to T3, the third switching valve 203 is opened, the second proportional valve 16 is opened, and the opening degree of the first proportional valve 15 and the second proportional valve 16 is adjusted to adjust the value monitored by the second pressure sensor 7 to P1.

[0045] When the value monitored by the first pressure sensor 6 is greater than P2, the fourth switch valve 204 opens and the second fan 102 runs; when the value monitored by the first pressure sensor 6 is less than P3, the second fan 102 closes and the fourth switch valve 204 closes.

[0046] When the value detected by the first temperature sensor 3 or the second temperature sensor 4 is greater than T4, the fifth switch valve 205 opens, the fourth switch valve 204 opens, and the second fan 102 runs; when the value detected by the first temperature sensor 3 or the second temperature sensor 4 is lower than T5, the second fan 102 closes, and the fourth switch valve 204 and the fifth switch valve 205 close.

[0047] When the value detected by the first temperature sensor 3 or the second temperature sensor 4 is greater than T6, and the running time is greater than t1, the preheating ends.

[0048] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A low temperature start-up system for a fuel cell power system, characterized by, It includes a fuel cell stack housing and a BOP housing; the fuel cell stack housing is a sealed housing, and a first temperature sensor and a first pressure sensor are installed inside the fuel cell stack housing; the fuel cell stack is located inside the fuel cell stack housing. The BOP enclosure is a sealed enclosure, and a second temperature sensor is installed inside the BOP enclosure; an air compressor is installed inside the BOP enclosure, and the air compressor is connected to the fuel cell stack through a first air supply pipeline; The fuel cell stack housing is also equipped with a second air supply line, which is located on the first air supply line. The second air supply line is divided into two branches to blow air onto the collector plates on both sides of the fuel cell stack.

2. A low temperature start-up system for a fuel cell power system as set forth in claim 1, characterized by, A second proportional valve and a third temperature sensor are installed on the first air supply line. The second proportional valve is located on the side closer to the fuel cell stack, and the third temperature sensor is located on the side closer to the air compressor.

3. A low temperature start-up system for a fuel cell power system as set forth in claim 2, characterized by, The second air supply line is located between the second proportional valve and the third temperature sensor.

4. The low-temperature start-up system for a fuel cell power generation system as described in claim 1, characterized in that, The fuel cell stack housing and the BOP housing are respectively provided with a first opening on the fuel cell stack side and a first opening on the BOP side. The two openings are connected by a first pipeline, and a first fan and a first switching valve are provided on the first pipeline.

5. A low temperature start-up system for a fuel cell power system as set forth in claim 1, characterized by, The fuel cell stack housing and the BOP housing are respectively provided with a second opening on the fuel cell stack side and a second opening on the BOP side. The two openings are connected by a second pipeline, and a second switching valve is provided on the second pipeline.

6. A low temperature start-up system for a fuel cell power system as set forth in claim 1, characterized by, The exhaust port of the fuel cell stack is connected to a third pipeline, and a third switching valve is installed on the third pipeline.

7. A low temperature start-up system for a fuel cell power system as set forth in claim 1, characterized by, The fuel cell stack housing has a fourth opening, which is connected to a fourth pipeline. A fourth switching valve and a second fan are installed on the fourth pipeline.

8. The low-temperature start-up system for a fuel cell power generation system as described in claim 1, characterized in that, The BOP box is provided with a fifth opening, the fifth opening is fixed with a fifth pipeline, and a fifth switch valve is provided on the fifth pipeline.

9. A low-temperature start-up system for a fuel cell power generation system as described in claim 1, characterized in that, The BOP housing is provided with a sixth opening, which is connected to a sixth pipeline. The air compressor is connected to an air filter device through the sixth pipeline.

10. A low temperature start-up system for a fuel cell power system as set forth in claim 9, characterized by, The air filtration device is located outside the BOP enclosure.

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