High-pressure hydrogen precooling heat exchanger

Abstract

The utility model discloses a high-pressure hydrogen precooling heat exchanger which comprises a cover plate, gas side partition plates, liquid side partition plates and a bottom plate, and the gas side partition plates and the liquid side partition plates are alternately arranged between the cover plate and the bottom plate in an array mode. The cover plate, the gas side partition plate, the liquid side partition plate and the bottom plate are integrally formed through vacuum brazing or pressure diffusion welding and are of a cylindrical structure. The heat exchanger is reasonable in structure, good in pressure resistance, high in reliability and high in heat exchange efficiency.

Description

Technical Field

[0001] The utility model relates to the field of radiators, and more specifically, to a high-pressure hydrogen precooling heat exchanger. Background Art

[0002] Hydrogen refueling machines are divided into two pressure levels: 35MPa hydrogenation and 70MPa hydrogenation. Both 35MPa and 70MPa hydrogenation machines must be equipped with precooling heat exchangers. The main reason is that during the process of hydrogenation of the on-board hydrogen supply system with high-pressure hydrogen, if the hydrogen is quickly refilled without temperature control measures, the compression heat and Joule-Thompson effect of the hydrogen refueling process will cause the temperature in the gas cylinder of the on-board hydrogen supply system to rise rapidly, far exceeding the permitted operating temperature range of the hydrogen storage bottle, posing a huge safety hazard. Therefore, hydrogen precooling must be taken before hydrogen refueling.

[0003] Currently, there are two main types of pre-cooling heat exchangers: shell-and-tube pre-cooling heat exchangers and microchannel plate heat exchangers. The disadvantages of the shell-and-tube pre-cooling heat exchanger are large size, poor heat exchange effect, low integration, and need to be installed in the external area of ​​the hydrogenation machine. The multiple interfaces increase the risk of leakage. The advantages are relatively low cost and small size of the microchannel plate. The advantages of the microchannel plate heat exchanger are high heat exchange efficiency, high integration, and can be installed inside the hydrogenation machine. The disadvantage is that the cost is slightly higher. The commercially available microchannel plate heat exchangers are all square structures, and the square structure will have a certain flow dead zone. Utility Model Content

[0004] The utility model aims to provide a high-pressure hydrogen precooling heat exchanger with reasonable structure, good pressure resistance, high reliability and high heat exchange efficiency.

[0005] The technical solution adopted by the utility model to solve this technical problem is: a high-pressure hydrogen precooling heat exchanger, comprising a cover plate, a gas side baffle, a liquid side baffle and a bottom plate, wherein the gas side baffle and the liquid side baffle are alternately arranged in an array between the cover plate and the bottom plate;

[0006] The cover plate, the gas side partition plate, the liquid measuring partition plate and the bottom plate are integrally formed by vacuum brazing or pressure diffusion welding and have a cylindrical structure.

[0007] As a further solution of the utility model, a gas channel is arranged on the surface of the gas-side partition plate, and a liquid channel is arranged on the surface of the liquid-side partition plate.

[0008] As a further solution of the utility model, the channel dimensions of the gas channel and the liquid channel are microchannel structures with a width and a depth both not exceeding 1 mm, the channel widths of the gas channel and the liquid channel are the same, and the channel width is the same as the wall thickness between the channels.

[0009] As a further solution of the utility model, the gas channel is a serpentine flow channel, and the bottom of the channel is rounded.

[0010] As a further solution of the utility model, the liquid channel is a serpentine flow channel, and the bottom of the channel is rounded.

[0011] As a further solution of the utility model, the cover plate, the gas side partition plate, and the liquid side partition plate are all provided with gas side inlet and outlet, liquid side inlet and outlet; the bottom plate is provided with liquid side inlet and outlet;

[0012] The gas side inlet and outlet of the gas side partition are communicated with the gas channel, and the liquid side inlet and outlet of the liquid side partition are communicated with the liquid channel.

[0013] As a further solution of the utility model, a lifting hole and a mounting hole are provided on the cover plate.

[0014] As a further solution of the utility model, the gas side inlet and liquid side outlet of the cover plate, gas side baffle plate, liquid side baffle plate and bottom plate are arranged on one side, and the gas side outlet and liquid side inlet of the cover plate, gas side baffle plate, liquid side baffle plate and bottom plate are arranged on the other side.

[0015] The utility model at least has the following beneficial effects:

[0016] 1. The utility model adopts a plate heat exchanger structure, which is more compact, small in size, high in pressure resistance, flexible in structural design, easy to install, and has a higher heat exchange area and efficiency than shell and tube or sleeve structures. The pre-cooling heat exchanger of this patent is designed as a circular structure, with a larger heat exchange area within the same volume. In addition, the circular structure is more conducive to the arrangement of the flow channel, and a pure countercurrent structure on the cold and hot sides can be realized (from the perspective of heat exchange, the countercurrent has a higher heat exchange efficiency than the downstream, cross flow or reverse differential flow structure).

[0017] 2. Because the working pressure of this heat exchanger is extremely high, the circular heat exchanger structure has a higher pressure resistance when compared and analyzed from the perspective of pressure resistance. The new liquid test and gas side channels are both microchannel structures, which greatly improves the heat exchange capacity of the product while ensuring the pressure resistance.

[0018] 3. Integrated design of liquid test and gas side inlet and outlet with cover plate and bottom plate: The liquid test and gas side inlet and outlet are directly processed on the cover plate and bottom plate. Compared with the welded inlet and outlet joints of heat exchangers on the market, the appearance is more beautiful and there is no risk of leakage.

[0019] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the utility model high-pressure hydrogen precooling heat exchanger;

[0021] Figure 2 This is a top view of the cover plate of the high-pressure hydrogen precooling heat exchanger of the utility model;

[0022] Figure 3 It is a top view of the air side baffle;

[0023] Figure 4 It is a top view of the liquid side partition;

[0024] Figure 5 This is a schematic diagram of the base plate.

[0025] Explanation of the reference numerals: 1 cover plate, 2 gas side partition plate, 3 liquid side partition plate, 4 bottom plate, 5 gas channel, 6 liquid channel, 7 gas side inlet, 8 gas side outlet, 9 liquid side inlet, 10 liquid side outlet, 11 lifting hole and installation hole. DETAILED DESCRIPTION

[0026] The utility model is described in detail and completely below in conjunction with the accompanying drawings. A person of ordinary skill in the art will be able to implement the utility model based on these descriptions. Before describing the utility model in conjunction with the accompanying drawings, it should be particularly pointed out that the technical solutions and technical features provided in each part of the utility model, including the following description, can be combined with each other without conflict.

[0027] In addition, the embodiments of the present invention involved in the following description are generally only a part of the embodiments of the present invention, rather than all of the embodiments. Therefore, based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0028] The following is a further detailed description of the utility model in conjunction with the accompanying drawings and implementations, and its specific implementation process is as follows:

[0029] like Figures 1 to 5As shown, the utility model provides a high-pressure hydrogen precooling heat exchanger, including a cover plate 1, a gas-side baffle 2, a liquid-side baffle 3 and a bottom plate 4. The cover plate 1 and the bottom plate 4 are the top and bottom surfaces of the heat exchanger respectively. The gas-side baffle 2 and the liquid-side baffle 3 are arranged alternately in an array between the cover plate 1 and the bottom plate 4. The high-pressure hydrogen flows in the gas-side baffle 2, and the low-temperature refrigerant flows in the liquid-side baffle. Etching or stamping is recommended for processing the gas-side baffle 2 and the liquid-side baffle. The cover plate 1, the gas-side baffle 2, the liquid-side baffle and the bottom plate 4 are integrally formed by vacuum brazing or pressure diffusion welding as a whole, and have a cylindrical structure. The precooling heat exchanger is designed as a circular structure, and the heat exchange area within the same volume is larger. The cover plate 1 is milled. After processing, the roughness of the welding surface should not be greater than 0.4, and the flatness of the upper and lower surfaces should not be greater than 0.05mm. The material of the cover plate 1 is preferably 316L.

[0030] The technical solution may further include the following technical details to better achieve the technical effect: a gas channel 5 is provided on the surface of the gas-side partition plate 2 , and a liquid channel 6 is provided on the surface of the liquid-side partition plate 3 .

[0031] The technical solution may also include the following technical details to better achieve the technical effect: the channel dimensions of the gas channel 5 and the liquid channel 6 are microchannel structures with a width and a depth not exceeding 1 mm, the channel widths of the gas channel 5 and the liquid channel 6 are the same, and the channel width is the same as the wall thickness between the channels.

[0032] The present technical solution may also include the following technical details to better achieve the technical effect: the gas channel 5 is a serpentine flow channel, the bottom of the channel is rounded to improve the pressure resistance, and the gas side partition 2 is preferably a 316L double mirror panel.

[0033] The technical solution may also include the following technical details to better achieve the technical effect: the liquid channel 6 is a serpentine flow channel, the bottom of the channel is rounded to improve the pressure resistance, and the liquid test partition is preferably a 316L double mirror panel.

[0034] The technical solution may also include the following technical details to better achieve the technical effect: the cover plate 1, the gas side partition plate 2, and the liquid side partition plate 3 are all provided with gas side inlet and outlet, liquid side inlet and outlet; the bottom plate 4 is provided with liquid side inlet and outlet;

[0035] The gas side inlet and outlet of the gas side partition 2 are connected to the gas channel 5, and the liquid side inlet and outlet of the liquid side partition 3 are connected to the liquid channel 6. In the above technical scheme, the liquid side inlet 9 of the cover plate 1, the gas side partition 2, the liquid side partition 3 and the bottom plate 4 are connected to each other, the liquid side outlet 10 of the cover plate 1, the gas side partition 2, the liquid side partition 3 and the bottom plate 4 are connected to each other, the gas side inlet 7 of the cover plate 1, the gas side partition 2 and the liquid side partition 3 are connected to each other, and the gas side outlet 8 of the cover plate 1, the gas side partition 2 and the liquid side partition 3 are connected to each other. The cover plate 1 should have a certain thickness to ensure the processing size of the inlet and outlet interfaces and the mounting holes. The material of the cover plate 1 is preferably 316L. The bottom plate 4 is a flat plate, and its thickness is not less than the minimum pressure-resistant thickness. The material of the bottom plate 4 is preferably 316L.

[0036] The technical solution may also include the following technical details to better achieve the technical effect: the cover plate 1 is provided with a lifting hole and a mounting hole 11. Before welding, the cover plate 1 only needs to process the bottom holes of the gas side inlet and outlet and the liquid side inlet and outlet, and after welding, the lifting hole, mounting hole and gas and liquid side inlet and outlet threads are processed.

[0037] The present technical solution may also include the following technical details to better achieve the technical effect: the gas side inlet 7 and the liquid side outlet 10 of the cover plate 1, the gas side baffle plate 2, the liquid side baffle plate 3 and the bottom plate 4 are arranged on one side, and the gas side outlet 8 and the liquid side inlet 9 of the cover plate 1, the gas side baffle plate 2, the liquid side baffle plate 3 and the bottom plate 4 are arranged on the other side, and the gas side and the liquid side are countercurrently designed to improve the heat exchange effect.

[0038] Although the implementation scheme of the utility model has been disclosed as above, it is not limited to the applications listed in the specification and implementation scheme. It can be fully applied to various fields suitable for the utility model. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the utility model is not limited to the specific details and the embodiments shown and described herein.

Claims

1. A high-pressure hydrogen precooling heat exchanger, characterized in that: It includes a cover plate, a gas side baffle plate, a liquid side baffle plate and a bottom plate, wherein the gas side baffle plate and the liquid side baffle plate are alternately arranged in an array between the cover plate and the bottom plate; The cover plate, the gas side partition plate, the liquid measuring partition plate and the bottom plate are integrally formed by vacuum brazing or pressure diffusion welding and have a cylindrical structure.

2. The high-pressure hydrogen precooling heat exchanger according to claim 1, characterized in that: The surface of the gas-side partition is provided with gas channels, and the surface of the liquid-side partition is provided with liquid channels.

3. The high-pressure hydrogen precooling heat exchanger according to claim 2, characterized in that: The channel dimensions of the gas channel and the liquid channel are microchannel structures with a width and a depth both not exceeding 1 mm. The channel widths of the gas channel and the liquid channel are the same, and the channel width is the same as the wall thickness between the channels.

4. The high-pressure hydrogen precooling heat exchanger according to claim 2, characterized in that: The gas channel is a serpentine flow channel, and the bottom of the channel is rounded.

5. The high-pressure hydrogen precooling heat exchanger according to claim 2, characterized in that: The liquid channel is a serpentine flow channel, and the bottom of the channel is rounded.

6. The high-pressure hydrogen precooling heat exchanger according to claim 2, characterized in that: The cover plate, the gas side partition plate, and the liquid side partition plate are all provided with gas side inlet and outlet, liquid side inlet and outlet; the bottom plate is provided with liquid side inlet and outlet; The gas side inlet and outlet of the gas side partition are communicated with the gas channel, and the liquid side inlet and outlet of the liquid side partition are communicated with the liquid channel.

7. The high-pressure hydrogen precooling heat exchanger according to claim 6, characterized in that: The cover plate is provided with a lifting hole and a mounting hole.

8. The high-pressure hydrogen precooling heat exchanger according to claim 6, characterized in that: The gas side inlet and liquid side outlet of the cover plate, gas side baffle plate, liquid side baffle plate and bottom plate are arranged on one side, and the gas side outlet and liquid side inlet of the cover plate, gas side baffle plate, liquid side baffle plate and bottom plate are arranged on the other side.

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