Refrigerating system utilizing compressed hydrogen

Abstract

The utility model provides a refrigerating system utilizing compressed hydrogen. The refrigerating system comprises an electric pile, a fan, a throttling expansion valve and an expansion evaporation heat exchanger, a hydrogen inlet of the electric pile is sequentially connected with the expansion evaporation heat exchanger and the throttling expansion valve through a pipeline, and the throttling expansion valve is connected with a high-pressure compressed hydrogen source; the air inlet side of the expansion evaporation heat exchanger is connected with a throttling expansion valve; and a fan is arranged below the expansion evaporation heat exchanger. According to the utility model, the economical efficiency of the hydrogen fuel cell automobile is effectively improved, and the energy of high-pressure compressed hydrogen is fully utilized to refrigerate the air conditioner of the automobile cab.

Description

Technical Field

[0001] The utility model belongs to the field of fuel cell systems, and particularly relates to a compressed hydrogen utilization refrigeration system. Background Art

[0002] As a new generation of new energy vehicles, hydrogen fuel cell vehicles have the advantages of high energy conversion efficiency, low noise, and zero pollution, and have broad development prospects in the automotive field. Especially in recent years, with the country's attention to hydrogen energy, hydrogen fuel cell vehicles, as the main scenario of hydrogen energy application, have received extensive attention. The development of hydrogen fuel cell vehicles is of far-reaching significance for promoting the development of new energy vehicles and plays an important role in achieving the country's dual-carbon goal.

[0003] Hydrogen fuel cell vehicles usually use compressed hydrogen with a pressure as high as 35 MPa or 70 MPa as the fuel of the fuel cell. In hydrogen fuel cell vehicles, high-pressure compressed hydrogen usually directly enters the fuel cell stack for reaction after being decompressed by a pressure reducing valve from a high-pressure hydrogen cylinder. The huge energy contained in the compressed hydrogen fails to be effectively utilized, resulting in energy loss.

[0004] In the existing technical solutions, the high-pressure hydrogen in hydrogen fuel cell vehicles directly reduces the pressure of the hydrogen through a pressure reducing valve and is transported to the inside of the stack through a pipeline, without utilizing the energy of the high-pressure hydrogen. Content of the Utility Model

[0005] The utility model overcomes the above defects and provides a compressed hydrogen utilization refrigeration system. The utility model effectively improves the economy of hydrogen fuel cell vehicles and fully utilizes the energy of high-pressure compressed hydrogen to refrigerate the air conditioner in the vehicle cab.

[0006] The technical solution of the utility model is as follows.

[0007] A compressed hydrogen utilization refrigeration system includes a stack, a fan, a throttle expansion valve, and an expansion evaporation heat exchanger; the hydrogen inlet of the stack is sequentially connected to the expansion evaporation heat exchanger and the throttle expansion valve through a pipeline, and the throttle expansion valve is connected to a high-pressure compressed hydrogen source; the intake side of the expansion evaporation heat exchanger is connected to the throttle expansion valve; a fan is arranged below the expansion evaporation heat exchanger. The air blown by the fan passes through the expansion evaporation heat exchanger, and the temperature of the air is reduced through heat exchange, and the cold air is blown to the vehicle cab to achieve the refrigeration effect of the cab.

[0008] Further, the hydrogen outlet of the stack is sequentially connected to a steam-water separator and a hydrogen pump; the hydrogen pump is connected to the hydrogen inlet pipeline of the stack.

[0009] Further, the bottom water / gas discharge port of the steam-water separator is connected to the atmosphere for discharge.

[0010] Further, the high-pressure compressed hydrogen source stores hydrogen in hydrogen cylinders.

[0011] Further, a manual valve is provided between the throttle expansion valve and the high-pressure compressed hydrogen source.

[0012] Further, a hydrogen inlet valve and a proportional valve are provided on the pipeline between the expansion evaporation heat exchanger and the fuel cell stack.

[0013] Further, a pressure sensor is connected to the pipeline between the hydrogen inlet valve and the proportional valve.

[0014] Further, the gas outlet side of the expansion evaporation heat exchanger is connected to the hydrogen inlet valve.

[0015] In a vehicle-mounted fuel cell, the pressure of compressed hydrogen is as high as 35 MPa and 70 MPa, while the hydrogen pressure actually used in the fuel cell system is only 0.2 - 0.6 MPa. A large amount of energy contained in the compressed hydrogen is not fully utilized. The present utility model effectively utilizes the energy of the compressed hydrogen and improves the utilization efficiency of hydrogen.

[0016] One way to utilize the cold energy in the present utility model is to provide the cold energy to the air conditioning system of the vehicle, achieving a significant reduction in the power consumption of the vehicle air conditioning system. The attached drawing presents the schematic diagram of the hydrogen refrigeration air conditioning system. In a normal hydrogen gas pipeline, only a throttle expansion valve and an expansion evaporation heat exchange device need to be added. The heat exchange can adopt the mode of liquid or gas heat exchange and can be combined with the design of the vehicle air conditioning system.

[0017] The throttle expansion valve and the expansion evaporation heat exchange device are provided in the hydrogen gas pipeline of the hydrogen fuel cell engine system of the present utility model and are used in combination with the air conditioning system of the hydrogen fuel cell vehicle.

[0018] In the present utility model, the high-pressure compressed hydrogen coming out of the hydrogen storage cylinder is decompressed through the throttle expansion valve and the expansion evaporation heat exchange device. The present utility model utilizes the cold energy generated after expanding the high-pressure compressed hydrogen through the way of liquid or gas exchange and exchanges it to the air conditioning system to realize the refrigeration function of the air conditioning.

[0019] Compared with the prior art, the advantages of the present utility model are as follows:

[0020] (1) The present utility model effectively utilizes the energy of the high-pressure compressed hydrogen in the hydrogen storage system of the hydrogen fuel cell vehicle;

[0021] (2) The present utility model realizes the combination of the vehicle-mounted high-pressure compressed hydrogen in the hydrogen fuel cell vehicle and the refrigeration function of the vehicle air conditioning;

[0022] (3) The present utility model effectively improves the economy of the hydrogen fuel cell vehicle and fully utilizes the energy of the high-pressure compressed hydrogen to refrigerate the air conditioning in the vehicle cab. Description of the Drawings

[0023] Figure 1 This is a schematic structural diagram of the compression hydrogen refrigeration system utilized by the present utility model.

[0024] Each component in the figure is as follows: fuel cell stack 1, proportional valve 2, hydrogen pump 3, steam-water separator 4, hydrogen inlet valve 5, expansion evaporation heat exchanger 6, throttle expansion valve 7, manual valve 8, hydrogen cylinder 9, and fan 10. Specific implementation manners

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. It should be understood that the accompanying drawings in the present application are only for the purposes of illustration and description, and are not used to limit the protection scope of the present application.

[0026] As Figure 1 shown, this embodiment includes a fuel cell stack 1, a proportional valve 2, a hydrogen pump 3, a steam-water separator 4, a hydrogen inlet valve 5, an expansion evaporation heat exchanger 6, a throttle expansion valve 7, a manual valve 8, a hydrogen cylinder 9, and a fan 10. The hydrogen cylinder 9 is sequentially connected to the manual valve 8, the throttle expansion valve 7, and the expansion evaporation heat exchanger 6. The gas outlet side of the expansion evaporation heat exchanger 6 is sequentially connected to the hydrogen inlet valve 5 and the proportional valve 2. The proportional valve 2 is connected to the hydrogen inlet of the fuel cell stack 1. The hydrogen outlet of the fuel cell stack 1 is sequentially connected to the steam-water separator 4 and the hydrogen pump 3. The hydrogen pump 3 is connected to the hydrogen inlet pipeline of the fuel cell stack. A fan 10 is provided below the expansion evaporation heat exchanger 6 in this embodiment. The bottom water / gas discharge port of the steam-water separator 4 is connected to the atmosphere for discharge. In this embodiment, a pressure sensor is connected to the pipeline between the hydrogen inlet valve 5 and the proportional valve 2.

[0027] As Figure 1 shown, the components within the dashed line are the key components of this embodiment. By expanding high-pressure compressed hydrogen through a throttle expansion valve to achieve pressure reduction, a large amount of cold energy is generated while obtaining low-pressure hydrogen. By transferring and utilizing this cold energy through liquid or gas exchange, the utilization of the energy contained in high-pressure compressed hydrogen can be achieved.

[0028] The usage method of this embodiment is as follows: By opening the manual valve, high-pressure compressed hydrogen flows out from the hydrogen cylinder and passes through the throttle expansion valve. During this process, the pressure of the hydrogen continuously decreases, absorbing heat and generating a large amount of cold energy. The cold energy is exchanged to the air-conditioning system through the expansion evaporation heat exchange device to achieve the refrigeration mode of the automotive air conditioner. When the automotive air conditioner needs refrigeration, it can be achieved without the compressor of the automotive air conditioner itself working, saving energy consumption.

[0029] The above are only the specific embodiments of the present utility model, but not the limitations thereof. Those skilled in the art can make modifications and improvements based on the basic idea of the present invention. However, all other embodiments obtained without creative efforts fall within the scope of protection of the present utility model.

Claims

1. A refrigeration system using compressed hydrogen, characterized in that: It comprises a fuel cell stack (1), a fan (10), a throttling expansion valve (7) and an expansion evaporation heat exchanger (6); the hydrogen inlet of the fuel cell stack (1) is connected to the expansion evaporation heat exchanger (6) and the throttling expansion valve (7) in sequence through a pipeline, and the throttling expansion valve (7) is connected to a high-pressure compressed hydrogen source; the air inlet side of the expansion evaporation heat exchanger (6) is connected to the throttling expansion valve (7); and a fan (10) is arranged below the expansion evaporation heat exchanger (6).

2. A refrigeration system using compressed hydrogen as claimed in claim 1, characterized in that: The hydrogen outlet of the fuel cell stack (1) is connected to the steam-water separator (4) and the hydrogen pump (3) in sequence; and the hydrogen pump (3) is connected to the fuel cell stack hydrogen inlet pipeline.

3. A refrigeration system using compressed hydrogen as claimed in claim 2, characterized in that: The bottom water / gas discharge port of the steam-water separator (4) is connected to the atmosphere for discharge.

4. A refrigeration system using compressed hydrogen as claimed in claim 1, characterized in that: The high-pressure compressed hydrogen source adopts a hydrogen cylinder to store hydrogen.

5. A refrigeration system using compressed hydrogen as claimed in claim 1, characterized in that: A manual valve (8) is provided between the throttling expansion valve (7) and the high-pressure compressed hydrogen source.

6. A refrigeration system using compressed hydrogen as claimed in claim 1, characterized in that: A hydrogen inlet valve (5) and a proportional valve (2) are provided on the pipeline between the expansion evaporation heat exchanger (6) and the fuel cell stack (1).

7. A refrigeration system using compressed hydrogen as claimed in claim 6, characterized in that: A pressure sensor is connected to the pipeline between the hydrogen inlet valve (5) and the proportional valve (2).

8. A refrigeration system using compressed hydrogen as claimed in claim 1, characterized in that: The gas outlet side of the expansion evaporation heat exchanger (6) is connected to the hydrogen inlet valve (5).

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