Hydrogen refueling station cooling system and hydrogen refueling station

Abstract

The invention discloses a hydrogen refueling station cooling system and a hydrogen refueling station, which are applied to the technical field of hydrogen refueling stations, and are characterized in that a gas inlet of a first compression module is connected with a hydrogen gas source, and a gas outlet of the first compression module is connected to a gas inlet of a normal-temperature heat exchange module; an air outlet of the normal-temperature heat exchange module is connected to a first air inlet of the second compression module; an air outlet of the second compression module is connected to an air inlet of the step-by-step heat exchange module; an air outlet of the step-by-step heat exchange module is connected to an air inlet of the energy recovery module; a first gas outlet of the energy recovery module is connected to a gas inlet of the low-temperature gas storage module, and a second gas outlet of the energy recovery module extends to a gas inlet of the second compression module, so that the cooling power consumption is reduced while hydrogen precooling is realized through the step-by-step heat exchange module and the energy recovery module, and the operation cost of the hydrogen refueling station is further reduced; and a traditional precooling mode that high-temperature hydrogen is directly cooled through a low-temperature medium is replaced, the low-temperature hydrogen preparation reliability is enhanced, and the hydrogen precooling cost is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of hydrogen refueling stations, and in particular to a cooling system for a hydrogen refueling station and a hydrogen refueling station. Background Art

[0002] With the enhancement of environmental awareness, new energy vehicles, especially hydrogen energy vehicles, are gradually becoming popular among the public. Hydrogen refueling stations are equipment for filling hydrogen into the hydrogen storage tanks of hydrogen energy vehicles. In order to reduce the time of hydrogen refueling, large-flow hydrogen refueling stations are booming. In large-flow hydrogen refueling stations, the hydrogen compressor compresses the hydrogen and sends it into the hydrogen storage tank. The hydrogen refueling machine sucks the hydrogen in the hydrogen storage tank and sends it into the hydrogen energy vehicle storage tank. In this process, the hydrogen compressor compresses the hydrogen, which will increase the pressure of the hydrogen and expand and generate heat. When filling the hydrogen storage tank of the hydrogen energy vehicle with hydrogen, in order to obtain more, faster and safer hydrogen, it is necessary to pre-cool the hydrogen at ambient temperature to the temperature entering the hydrogen energy vehicle. The optimal temperature of the vehicle hydrogen storage tank (for example, -40°C). Therefore, large-flow hydrogen refueling stations are often equipped with hydrogen refueling station cooling systems. Existing hydrogen refueling station cooling systems usually use cooling units to generate low-temperature media, and then use the low-temperature media to perform convective heat exchange on hydrogen to generate low-temperature hydrogen. In existing hydrogen refueling station cooling systems, since cooling units are high-energy-consuming equipment, the energy consumption generated by hydrogen cooling at hydrogen refueling stations is huge every day, resulting in high operating costs for hydrogen refueling stations. Moreover, since the hydrogen pre-cooling temperature is low, the hydrogen refueling station cooling system usually improves the cooling effect by cooling the hydrogen multiple times, but the heat transfer efficiency is often low and the cooling effect is not ideal. Summary of the invention

[0003] The present application provides a hydrogen refueling station cooling system and a hydrogen refueling station, which are used to solve the problems of high operating costs of hydrogen refueling stations in the prior art and unsatisfactory cooling efficiency and cooling effect of the cooling system of the hydrogen refueling station. Specifically, the technical solutions provided by the present application are as follows:

[0004] On the one hand, the present application provides a cooling system for a hydrogen refueling station, including a first compression module, a normal temperature heat exchange module, a second compression module, a step-by-step heat exchange module, an energy recovery module, and a low-temperature gas storage module; the air inlet of the first compression module is connected to a hydrogen gas source, and the air outlet of the first compression module is connected to the air inlet of the normal temperature heat exchange module; the first compression module is used to compress the normal temperature hydrogen input from the hydrogen gas source to a first pressure value and then output it to the normal temperature heat exchange module; the air outlet of the normal temperature heat exchange module is connected to the first air inlet of the second compression module; the normal temperature heat exchange module is used to perform normal temperature heat exchange on the high temperature hydrogen of the first pressure value input to the first compression module to obtain the normal temperature hydrogen of the first pressure value and then output it to the second compression module; the air outlet of the second compression module is connected to the air inlet of the step-by-step heat exchange module; the second compression module is used to compress the normal temperature hydrogen of the first pressure value input to the normal temperature heat exchange module After the hydrogen is compressed to a second pressure value, it is output to a step-by-step heat exchange module; the outlet of the step-by-step heat exchange module is connected to the inlet of the energy recovery module; the step-by-step heat exchange module is used to perform at least two stages of heat exchange with a gradually decreasing temperature on the high-temperature hydrogen of the second pressure value input by the second compression module to obtain low-temperature hydrogen of the second pressure value and then output it to the energy recovery module; the first outlet of the energy recovery module is connected to the inlet of the low-temperature gas storage module, and the second outlet of the energy recovery module extends to the inlet of the second compression module; the energy recovery module is used to expand the low-temperature hydrogen of the second pressure value input by the step-by-step heat exchange module to negative-temperature hydrogen of the first pressure value and then output it to the low-temperature gas storage module, and provide power for the second compression module during the expansion of the low-temperature hydrogen of the second pressure value; the low-temperature gas storage module is used to store the negative-temperature hydrogen of the first pressure value output by the energy recovery module.

[0005] In a possible embodiment, the first compression module includes a first high-pressure pump; the air inlet of the first high-pressure pump is connected to the hydrogen gas source through a first heat dissipation pipeline, and the air outlet of the first high-pressure pump is connected to the air inlet of the normal temperature heat exchange module through a second heat dissipation pipeline.

[0006] In a possible embodiment, the normal temperature heat exchange module includes a first high-pressure gas storage tank for normal temperature heat exchange; the air inlet of the first high-pressure gas storage tank is connected to the air outlet of the first compression module through a second heat dissipation pipeline, and the air outlet of the first high-pressure gas storage tank is connected to the first air inlet of the second compression module through a third heat dissipation pipeline.

[0007] In a possible embodiment, the second compression module includes a second high-pressure pump and a third high-pressure pump; the first air inlet of the second high-pressure pump is connected to the air outlet of the normal temperature heat exchange module through a third heat dissipation pipeline, the air outlet of the second high-pressure pump is connected to the first air inlet of the third high-pressure pump through a fourth heat dissipation pipeline, and the air outlet of the third high-pressure pump is connected to the air inlet of the step-by-step heat exchange module through a fifth heat dissipation pipeline.

[0008] In one possible embodiment, the energy recovery module includes a turbine; the air inlet of the turbine is connected to the air outlet of the step-by-step heat exchange module through a first insulating pipeline, the air outlet of the turbine is connected to the air inlet of the low-temperature gas storage module through a second insulating pipeline, and the turbine is transmission-connected to the second high-pressure pump or the third high-pressure pump in the second compression module; the turbine is used to expand the low-temperature hydrogen of the second pressure value input into the step-by-step heat exchange module to negative temperature hydrogen of the first pressure value and then output it to the low-temperature gas storage module, and drive the second high-pressure pump or the third high-pressure pump during the expansion of the low-temperature hydrogen at the second pressure value.

[0009] In a possible implementation, the low-temperature gas storage module includes a second high-pressure gas storage tank; an air inlet of the second high-pressure gas storage tank is connected to a first air outlet of the energy recovery module through a second thermally insulated pipeline.

[0010] In a possible embodiment, the step-by-step heat exchange module includes at least two stages of heat exchange units connected in sequence; in the at least two stages of heat exchange units, the air inlet of the first stage heat exchange unit is connected to the air outlet of the second compression module through a fifth heat dissipation pipeline, and the air outlet of the last stage heat exchange unit is connected to the air inlet of the energy recovery module through a first insulation pipeline.

[0011] In one possible embodiment, at least two stages of heat exchange units include a normal temperature heat exchange unit and a low temperature heat exchange unit; the air inlet of the normal temperature heat exchange unit is connected to the air outlet of the second compression module through a fifth heat dissipation pipeline, the air outlet of the normal temperature heat exchange unit is connected to the air inlet of the low temperature heat exchange unit through a sixth heat dissipation pipeline, and the air outlet of the low temperature heat exchange unit is connected to the air inlet of the energy recovery module through a first insulation pipeline.

[0012] In a possible embodiment, the normal temperature heat exchange unit includes a first ultra-high pressure gas storage tank for normal temperature heat exchange, and the low temperature heat exchange unit includes a low temperature heat exchanger and a second ultra-high pressure gas storage tank; the air inlet of the first ultra-high pressure gas storage tank is connected to the air outlet of the second compression module through a fifth heat dissipation pipeline, the air outlet of the first ultra-high pressure gas storage tank is connected to the first air inlet of the second ultra-high pressure gas storage tank through a sixth heat dissipation pipeline, the first air outlet of the second ultra-high pressure gas storage tank is connected to the air inlet of the energy recovery module through a first insulation pipeline, the air inlet of the low temperature heat exchanger is connected to the second air outlet of the second ultra-high pressure gas storage tank through a seventh heat dissipation pipeline, and the air outlet of the low temperature heat exchanger is connected to the second air inlet of the second ultra-high pressure gas storage tank through an eighth heat dissipation pipeline.

[0013] On the other hand, the present application provides a hydrogen refueling station, comprising the above-mentioned hydrogen refueling station cooling system.

[0014] The beneficial effects of this application are as follows:

[0015] The present application realizes hydrogen precooling through a step-by-step heat exchange module and an energy recovery module, while reducing cooling power consumption, thereby reducing the operating cost of the hydrogen refueling station. It also replaces the traditional hydrogen precooling method of directly cooling high-temperature hydrogen to negative-temperature hydrogen through a low-temperature medium, thereby enhancing the reliability of low-temperature hydrogen production and reducing the cost of hydrogen precooling.

[0016] Other features and advantages of the present application will be described in the subsequent description, and in part, will become apparent from the description, or will be understood by practicing the present application. The purpose and other advantages of the present application can be realized and obtained by the structures specifically pointed out in the written description, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0018] Figure 1 A schematic diagram of a component structure of a cooling system for a hydrogen refueling station in an embodiment of the present application;

[0019] Figure 2 This is another schematic diagram of the structure of the cooling system of the hydrogen refueling station in the embodiment of the present application;

[0020] Figure 3 This is another schematic diagram of the composition structure of the cooling system of the hydrogen refueling station in the embodiment of the present application. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and beneficial effects of this application clearer, the technical solution in the embodiment of this application will be clearly and completely described below in conjunction with the drawings in the embodiment of this application. Obviously, the described embodiment is only a part of the embodiment of this application, not all the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0022] In order to facilitate those skilled in the art to better understand the present application, the technical terms involved in the present application are briefly introduced below.

[0023] Normal temperature hydrogen refers to the temperature of hydrogen at room temperature, which can be understood as ambient temperature. For example, normal temperature hydrogen can be, but is not limited to, 15°C, 28°C, 30°C, 32°C, 35°C, etc.

[0024] Low-temperature hydrogen is the temperature of hydrogen after room-temperature hydrogen is subjected to low-temperature heat exchange. It can be understood as the transition temperature between high-temperature hydrogen and negative-temperature hydrogen. The transition temperature is negatively correlated with the amount of cryogenic medium used and can be flexibly set according to actual conditions. For example, low-temperature hydrogen can be but is not limited to 0°C or -2°C.

[0025] Negative temperature hydrogen is the temperature of low-temperature hydrogen after it is expanded by depressurization. It can be understood as the target pre-cooling temperature and can be flexibly set according to actual conditions. For example, negative temperature hydrogen can be but is not limited to -40°C, -42°C, etc.

[0026] The first pressure value is the hydrogen pressure after compressing the room-temperature hydrogen output from the long-tube trailer or the hydrogen refueling station gas source, and can be flexibly set according to actual needs. For example, the first pressure value can be but is not limited to 50 MPa.

[0027] The second pressure value is the hydrogen pressure after further compressing the hydrogen at the first pressure value, and can be flexibly set according to actual needs. For example, the second pressure value can be but is not limited to 85 MPa.

[0028] It should be noted that the terms "first", "second", etc. mentioned in this application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be interchangeable where appropriate, so that the embodiments described herein can be implemented in an order other than that illustrated or described herein.

[0029] After introducing the technical terms involved in this application, the technical solutions provided by this application are described in detail.

[0030] The present application embodiment provides a cooling system for a hydrogen refueling station. Figure 1 As shown, the hydrogen refueling station cooling system provided in the embodiment of the present application at least includes a first compression module 110, a normal temperature heat exchange module 120, a second compression module 130, a step-by-step heat exchange module 140, an energy recovery module 150, and a low-temperature gas storage module 160;

[0031] The air inlet of the first compression module 110 is connected to the hydrogen gas source, and the air outlet of the first compression module 110 is connected to the air inlet of the normal temperature heat exchange module 120; the first compression module 110 is used to compress the normal temperature hydrogen input from the hydrogen gas source to a first pressure value and then output it to the normal temperature heat exchange module 120;

[0032] The air outlet of the normal temperature heat exchange module 120 is connected to the first air inlet of the second compression module 130; the normal temperature heat exchange module 120 is used to perform normal temperature heat exchange on the high temperature hydrogen of the first pressure value input by the first compression module 110 to obtain the normal temperature hydrogen of the first pressure value and then output it to the second compression module 130;

[0033] The gas outlet of the second compression module 130 is connected to the gas inlet of the step-by-step heat exchange module 140; the second compression module 130 is used to compress the normal temperature hydrogen gas of the first pressure value input by the normal temperature heat exchange module 120 to a second pressure value and then output it to the step-by-step heat exchange module 140;

[0034] The gas outlet of the step-by-step heat exchange module 140 is connected to the gas inlet of the energy recovery module 150; the step-by-step heat exchange module 140 is used to perform at least two stages of heat exchange with a gradually decreasing temperature on the high-temperature hydrogen of the second pressure value input by the second compression module 130 to obtain low-temperature hydrogen of the second pressure value and then output it to the energy recovery module 150;

[0035] The first gas outlet of the energy recovery module 150 is connected to the gas inlet of the low-temperature gas storage module 160, and the second gas outlet of the energy recovery module 150 extends to the gas inlet of the second compression module 130; the energy recovery module 150 is used to expand the low-temperature hydrogen of the second pressure value input by the step-by-step heat exchange module 140 to negative temperature hydrogen of the first pressure value and then output it to the low-temperature gas storage module 160, and provide power for the second compression module 130 during the expansion process of the low-temperature hydrogen of the second pressure value;

[0036] The low-temperature gas storage module 160 is used to store the negative-temperature hydrogen gas of the first pressure value output by the energy recovery module 150 .

[0037] In practical applications, after the long tube trailer or the gas source of the hydrogen filling station arrives at the station, it is input to the first compression module 110, and the room temperature hydrogen is compressed to a first pressure value (for example, 50 MPa) by the first compression module 110 and then output to the room temperature heat exchange module 120. The room temperature heat exchange module 120 heats the high temperature hydrogen with a first pressure value (for example, 50 MPa) generated by the compression work of the first compression module 110 to room temperature (i.e., ambient temperature) and then outputs it to the second compression module 130. The second compression module 130 compresses the room temperature hydrogen with a first pressure value (for example, 50 MPa) to a second pressure value (for example, 85 MPa) and then outputs it to the step-by-step heat exchange module 140. The step-by-step heat exchange module 140 heats the second compression module 110 to a second pressure value (for example, 85 MPa). The high-temperature hydrogen gas of the second pressure value (e.g., 85 MPa) generated by the compression work of the step-by-step heat exchange module 130 reaches a low temperature (e.g., 0°C) through at least two stages of heat exchange with gradually decreasing heat exchange temperatures, and then is output to the energy recovery module 150. The energy recovery module 150 performs work under the driving action of the low-temperature (e.g., 0°C) hydrogen gas of the second pressure value (e.g., 85 MPa) output by the step-by-step heat exchange module 140, thereby decompressing and expanding the low-temperature (e.g., 0°C) hydrogen gas of the second pressure value (e.g., 85 MPa) to the negative temperature (e.g., -40°C) hydrogen gas of the first pressure value (e.g., 50 MPa), and then is output to the low-temperature gas storage module 160 for storage. At the same time, the low-temperature (e.g., 0°C) hydrogen gas of the second pressure value (e.g., 85 MPa) is stored in the low-temperature (e.g., 0°C) hydrogen gas of the first pressure value (e.g., 50 MPa). In the process of hydrogen gas pressure relief and expansion at a second pressure value (e.g., 85 MPa), the energy recovery module 150 provides power to the second compression module 130. In this way, the temperature of the hydrogen stored in the low-temperature gas storage module 160 is pre-cooled to the optimal temperature for entering the hydrogen storage tank of the hydrogen energy vehicle, so that the hydrogen fuel cell vehicle can be directly refilled by the hydrogen filling machine, thereby improving the refilling efficiency. In addition, the energy recovery module 150 performs work under the driving action of the low-temperature (e.g., 0°C) hydrogen gas at the second pressure value (e.g., 85 MPa) output by the step-by-step heat exchange module 140, which can reduce the pre-cooling energy consumption. In addition, the energy recovery module 150 also provides power to the second compression module 130 during the process of hydrogen gas pressure relief and expansion at a second pressure value (e.g., 85 MPa) at a low temperature (e.g., 0°C). The power can further reduce the pre-cooling energy consumption, thereby reducing the cooling power consumption while realizing hydrogen pre-cooling, thereby reducing the operating cost of the hydrogen refueling station. In addition, in the hydrogen pre-cooling process, the traditional hydrogen pre-cooling method of directly cooling high-temperature hydrogen to negative-temperature hydrogen only through a low-temperature medium is replaced, but first through normal temperature heat exchange and then through at least two stages of heat exchange with a gradually decreasing heat exchange temperature, thereby effectively reducing the use of low-temperature medium, thereby not only alleviating the problem of low efficiency and high cost of hydrogen pre-cooling due to directly cooling high-temperature hydrogen to negative-temperature hydrogen only through a low-temperature medium, but also enhancing the reliability of low-temperature hydrogen production, reducing the cost of hydrogen pre-cooling, and further reducing the operating cost of the hydrogen refueling station.

[0038] In specific implementation, the first compression module 110 can use a variety of structures to implement its functions. For example, see Figure 2As shown, the first compression module 110 may include a first high-pressure pump 111; the air inlet of the first high-pressure pump 111 is connected to the hydrogen gas source through a first heat dissipation pipeline, and the air outlet of the first high-pressure pump 111 is connected to the air inlet of the normal temperature heat exchange module 120 through a second heat dissipation pipeline.

[0039] In practical applications, the first compression module 110 can compress the room temperature hydrogen gas input from the long tube trailer or the hydrogen station gas source to a first pressure value (eg, 50 MPa) through the first high pressure pump 111 and then output it to the room temperature heat exchange module 120 .

[0040] In specific implementation, the normal temperature heat exchange module 120 can adopt a variety of structures to achieve its function, for example, see Figure 2 As shown, the normal temperature heat exchange module 120 may include a first high-pressure gas storage tank 121 for normal temperature heat exchange; the air inlet of the first high-pressure gas storage tank 121 is connected to the air outlet of the first compression module 110 through a second heat dissipation pipeline, and the air outlet of the first high-pressure gas storage tank 121 is connected to the first air inlet of the second compression module 130 through a third heat dissipation pipeline.

[0041] In actual applications, the normal temperature heat exchange module 120 can use a first high-pressure gas storage tank 121 (for example, a 50MPa high-pressure gas tank) to compress the high-temperature hydrogen of the first pressure value (for example, 50MPa) generated by the first compression module 110 to exchange heat to normal temperature (i.e., ambient temperature) and then output it to the second compression module 130.

[0042] In specific implementation, the second compression module 130 can use a variety of structures to implement its functions. For example, see Figure 2 As shown, the second compression module 130 may include a second high-pressure pump 131 and a third high-pressure pump 132; the first air inlet of the second high-pressure pump 131 is connected to the air outlet of the normal temperature heat exchange module 120 through a third heat dissipation pipeline, the air outlet of the second high-pressure pump 131 is connected to the first air inlet of the third high-pressure pump 132 through a fourth heat dissipation pipeline, and the air outlet of the third high-pressure pump 132 is connected to the air inlet of the step-by-step heat exchange module 140 through a fifth heat dissipation pipeline.

[0043] In practical applications, in order to effectively avoid the problem that the energy recovery module 150 provides insufficient power to the second compression module 130, which makes it difficult for the second compression module 130 to compress the room-temperature hydrogen with a first pressure value (for example, 50 MPa) to a second pressure value (for example, 85 MPa), the second compression module 130 includes at least two high-pressure pumps, a second high-pressure pump 131 and a third high-pressure pump 132. The room-temperature hydrogen with a first pressure value (for example, 50 MPa) is compressed to a second pressure value (for example, 85 MPa) by the second high-pressure pump 131 and the third high-pressure pump 132 and then output to the step-by-step heat exchange module 140.

[0044] In specific implementation, the step-by-step heat exchange module 140 can adopt a variety of structures to achieve its function. For example, see Figure 2 As shown, the step-by-step heat exchange module 140 may include at least two stages of heat exchange units 141 connected in sequence; in the at least two stages of heat exchange units 141, the air inlet of the first stage heat exchange unit 141 is connected to the air outlet of the second compression module 130 through the fifth heat dissipation pipeline, and the air outlet of the last stage heat exchange unit 141 is connected to the air inlet of the energy recovery module 150 through the first insulation pipeline.

[0045] In actual applications, the step-by-step heat exchange module 140 can heat the high-temperature hydrogen with a second pressure value (e.g., 85 MPa) generated by the compression work of the second compression module 130 to low-temperature hydrogen (e.g., 0°C) step by step through at least two-stage heat exchange units 141 with gradually decreasing heat exchange temperatures. For example, the high-temperature hydrogen with a second pressure value (e.g., 85 MPa) generated by the compression work of the second compression module 130 is heat-exchanged to low-temperature hydrogen (e.g., 0°C) step by step through a three-stage heat exchange unit 141 with heat exchange temperatures of 32°C, 10°C, and 0°C, respectively. For another example, the high-temperature hydrogen with a second pressure value (e.g., 85 MPa) generated by the compression work of the second compression module 130 is heat-exchanged to low-temperature hydrogen (e.g., -2°C) step by step through a four-stage heat exchange unit 141 with heat exchange temperatures of 36°C, 20°C, 10°C, and -2°C, respectively.

[0046] Preferably, see Figure 3 As shown, the at least two-stage heat exchange unit 141 may include a normal temperature heat exchange unit 142 and a low temperature heat exchange unit 143; the air inlet of the normal temperature heat exchange unit 142 is connected to the air outlet of the second compression module 130 through a fifth heat dissipation pipeline, the air outlet of the normal temperature heat exchange unit 142 is connected to the air inlet of the low temperature heat exchange unit 143 through a sixth heat dissipation pipeline, and the air outlet of the low temperature heat exchange unit 143 is connected to the air inlet of the energy recovery module 150 through a first insulation pipeline.

[0047] In actual applications, the step-by-step heat exchange module 140 successively exchanges the high-temperature hydrogen of the second pressure value (e.g., 85 MPa) generated by the compression work of the second compression module 130 to low-temperature (e.g., 0°C) hydrogen through the normal temperature heat exchange unit 142 and the low-temperature heat exchange unit 143, thereby cooling the high-temperature hydrogen at a relatively low cost, thereby further reducing the hydrogen cooling cost and the operating cost of the hydrogen refueling station.

[0048] In specific implementation, the normal temperature heat exchange unit 142 and the low temperature heat exchange unit 143 can adopt various structures to realize their functions. For example, Figure 3As shown, the normal temperature heat exchange unit 142 may include a first ultra-high pressure gas tank 1421 for normal temperature heat exchange, and the low temperature heat exchange unit 143 may include a second ultra-high pressure gas tank 1431 and a low temperature heat exchanger 1432; the air inlet of the first ultra-high pressure gas tank 1421 is connected to the air outlet of the second compression module 130 through a fifth heat dissipation pipeline, the air outlet of the first ultra-high pressure gas tank 1421 is connected to the first air inlet of the second ultra-high pressure gas tank 1431 through a sixth heat dissipation pipeline, the first air outlet of the second ultra-high pressure gas tank 1431 is connected to the air inlet of the energy recovery module 150 through a first insulation pipeline, the air inlet of the low temperature heat exchanger 1432 is connected to the second air outlet of the second ultra-high pressure gas tank 1431 through a seventh heat dissipation pipeline, and the air outlet of the low temperature heat exchanger 1432 is connected to the second air inlet of the second ultra-high pressure gas tank 1431 through an eighth heat dissipation pipeline.

[0049] In actual applications, the first ultra-high pressure gas tank 1421 (for example, an 85 MPa ultra-high pressure gas tank) outputs the high-temperature hydrogen of the second pressure value (for example, 85 MPa) generated by the compression work of the second high-pressure pump 131 and the third high-pressure pump 132 to the second ultra-high pressure gas tank 1431 (for example, an 85 MPa ultra-high pressure gas tank) after heat exchange to room temperature (i.e., ambient temperature). The second ultra-high pressure gas tank 1431 exchanges the room-temperature hydrogen of the second pressure value (for example, 85 MPa) with heat to a low temperature (for example, 0°C) through a low-temperature heat exchanger 1432 with a built-in low-temperature medium (for example, ice water, refrigerant, etc.) and then outputs it to the energy recovery module 150.

[0050] In specific implementation, the energy recovery module 150 can adopt various structures to realize its function, for example, Figure 2 and Figure 3 As shown, the energy recovery module 150 may include a turbine 151; the air inlet of the turbine 151 is connected to the air outlet of the step-by-step heat exchange module 140 through a first insulated pipeline, the air outlet of the turbine 151 is connected to the air inlet of the low-temperature gas storage module 160 through a second insulated pipeline, and the turbine 151 is connected to the second high-pressure pump 131 (such as Figure 2 as shown) or the third high pressure pump 132 (as shown Figure 3 The turbine 151 is used to expand the low-temperature hydrogen of the second pressure value input by the step-by-step heat exchange module 140 to the negative temperature hydrogen of the first pressure value and then output it to the low-temperature gas storage module 160, and drive the second high-pressure pump 131 or the third high-pressure pump 132 during the expansion of the low-temperature hydrogen of the second pressure value.

[0051] In actual applications, the energy recovery module 150 can achieve pressure relief and energy recovery through the turbine 151. The expansion of hydrogen in the second ultra-high pressure gas storage tank 1431 drives the turbine 151 to rotate and do work. The expansion back pressure of the turbine 151 can be flexibly set according to actual needs. For example, the expansion back pressure of the turbine 151 is a first pressure value (for example, 50 MPa). The turbine 151 decompresses and expands the low-temperature (for example, 0°C) hydrogen of the second pressure value (for example, 85 MPa) into the negative temperature (that is, the target pre-cooling temperature, for example, -40°C) hydrogen of the first pressure value (for example, 50 MPa) by rotating and doing work, and then outputs it to the low-temperature gas storage module 160. At the same time, the turbine 151 converts the heat energy generated during the rotation and doing work into mechanical energy to provide more air as power for the second high-pressure pump 131 or the third high-pressure pump 132 in the second compression module 130, thereby reducing the energy consumption of the second high-pressure pump 131 or the third high-pressure pump 132 in the second compression module 130, and further reducing the operating cost of the hydrogen refueling station.

[0052] In specific implementation, the low temperature gas storage module 160 can adopt a variety of structures to achieve its function, for example, see Figure 1 As shown, the low-temperature gas storage module 160 may include a second high-pressure gas storage tank 161; the gas inlet of the second high-pressure gas storage tank 161 is connected to the first gas outlet of the energy recovery module 150 through a second insulation pipeline.

[0053] In actual applications, the low-temperature gas storage module 160 can store negative temperature (i.e., target pre-cooling temperature, such as -40°C) hydrogen at a first pressure value (e.g., 50MPa) output by the turbine 151 in the energy recovery module 150 through a second high-pressure gas tank 161 (e.g., a 50MPa high-pressure gas tank). The temperature of the hydrogen stored in the second high-pressure gas tank 161 is pre-cooled to the optimal temperature for entering the hydrogen storage tank of a hydrogen energy vehicle, so that the hydrogen fuel cell vehicle can be directly refueled by a hydrogen refueling machine, thereby improving the hydrogen refueling efficiency.

[0054] Based on the same inventive concept, an embodiment of the present application further provides a hydrogen refueling station, which includes the above-mentioned hydrogen refueling station cooling system provided in the embodiment of the present application.

[0055] It should be noted that, although several units or subunits of the device are mentioned in the above detailed description, this division is merely exemplary and not mandatory. In fact, according to the embodiments of the present application, the features and functions of two or more units described above can be embodied in one unit. Conversely, the features and functions of one unit described above can be further divided into multiple units to be embodied.

[0056] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they are aware of the basic creative concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0057] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present application without departing from the spirit and scope of the embodiments of the present application. Thus, if these modifications and variations of the embodiments of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A cooling system for a hydrogen refueling station, characterized in that: It includes a first compression module, a normal temperature heat exchange module, a second compression module, a step-by-step heat exchange module, an energy recovery module, and a low temperature gas storage module; The air inlet of the first compression module is connected to a hydrogen gas source, and the air outlet of the first compression module is connected to the air inlet of the normal temperature heat exchange module; the first compression module is used to compress the normal temperature hydrogen input from the hydrogen gas source to a first pressure value and then output it to the normal temperature heat exchange module; The air outlet of the normal temperature heat exchange module is connected to the first air inlet of the second compression module; the normal temperature heat exchange module is used to perform normal temperature heat exchange on the high temperature hydrogen of the first pressure value input by the first compression module to obtain the normal temperature hydrogen of the first pressure value and then output it to the second compression module; The gas outlet of the second compression module is connected to the gas inlet of the step-by-step heat exchange module; the second compression module is used to compress the normal temperature hydrogen gas of the first pressure value input by the normal temperature heat exchange module to a second pressure value and then output it to the step-by-step heat exchange module; The gas outlet of the step-by-step heat exchange module is connected to the gas inlet of the energy recovery module; the step-by-step heat exchange module is used to perform at least two stages of heat exchange with gradually decreasing heat exchange temperature on the high-temperature hydrogen of the second pressure value input by the second compression module to obtain low-temperature hydrogen of the second pressure value and then output it to the energy recovery module; The first gas outlet of the energy recovery module is connected to the gas inlet of the low-temperature gas storage module, and the second gas outlet of the energy recovery module extends to the gas inlet of the second compression module; the energy recovery module is used to expand the low-temperature hydrogen of the second pressure value input by the step-by-step heat exchange module to negative temperature hydrogen of the first pressure value and then output it to the low-temperature gas storage module, and provide power for the second compression module during the expansion process of the low-temperature hydrogen of the second pressure value; The low-temperature gas storage module is used to store the negative-temperature hydrogen gas of the first pressure value output by the energy recovery module.

2. The cooling system of the hydrogen refueling station according to claim 1, characterized in that: The first compression module includes a first high-pressure pump; the air inlet of the first high-pressure pump is connected to a hydrogen gas source through a first heat dissipation pipeline, and the air outlet of the first high-pressure pump is connected to the air inlet of the normal temperature heat exchange module through a second heat dissipation pipeline.

3. The cooling system of the hydrogen refueling station according to claim 1, characterized in that: The normal temperature heat exchange module includes a first high-pressure gas storage tank for normal temperature heat exchange; the air inlet of the first high-pressure gas storage tank is connected to the air outlet of the first compression module through a second heat dissipation pipeline, and the air outlet of the first high-pressure gas storage tank is connected to the first air inlet of the second compression module through a third heat dissipation pipeline.

4. The cooling system of the hydrogen refueling station according to claim 1, characterized in that: The second compression module includes a second high-pressure pump and a third high-pressure pump; the first air inlet of the second high-pressure pump is connected to the air outlet of the normal temperature heat exchange module through a third heat dissipation pipeline, the air outlet of the second high-pressure pump is connected to the first air inlet of the third high-pressure pump through a fourth heat dissipation pipeline, and the air outlet of the third high-pressure pump is connected to the air inlet of the step-by-step heat exchange module through a fifth heat dissipation pipeline.

5. The cooling system of the hydrogen refueling station according to claim 4, characterized in that: The energy recovery module includes a turbine; the air inlet of the turbine is connected to the air outlet of the step-by-step heat exchange module through a first insulating pipeline, the air outlet of the turbine is connected to the air inlet of the low-temperature gas storage module through a second insulating pipeline, and the turbine is transmission-connected to the second high-pressure pump or the third high-pressure pump in the second compression module; the turbine is used to expand the low-temperature hydrogen of the second pressure value input into the step-by-step heat exchange module to negative-temperature hydrogen of the first pressure value and then output it to the low-temperature gas storage module, and drive the second high-pressure pump or the third high-pressure pump during the expansion process of the low-temperature hydrogen of the second pressure value.

6. The cooling system for a hydrogen refueling station according to claim 1, characterized in that: The low-temperature gas storage module includes a second high-pressure gas storage tank; the gas inlet of the second high-pressure gas storage tank is connected to the first gas outlet of the energy recovery module through a second thermal insulation pipeline.

7. The cooling system for a hydrogen refueling station according to any one of claims 1 to 6, characterized in that: The step-by-step heat exchange module includes at least two stages of heat exchange units connected in sequence; among the at least two stages of heat exchange units, the air inlet of the first stage of the heat exchange unit is connected to the air outlet of the second compression module through a fifth heat dissipation pipeline, and the air outlet of the last stage of the heat exchange unit is connected to the air inlet of the energy recovery module through a first insulation pipeline.

8. The cooling system of the hydrogen refueling station according to claim 7, characterized in that: The at least two-stage heat exchange unit includes a normal temperature heat exchange unit and a low temperature heat exchange unit; the air inlet of the normal temperature heat exchange unit is connected to the air outlet of the second compression module through the fifth heat dissipation pipeline, the air outlet of the normal temperature heat exchange unit is connected to the air inlet of the low temperature heat exchange unit through the sixth heat dissipation pipeline, and the air outlet of the low temperature heat exchange unit is connected to the air inlet of the energy recovery module through the first insulation pipeline.

9. The cooling system for a hydrogen refueling station according to claim 8, characterized in that: The normal temperature heat exchange unit includes a first ultra-high pressure gas storage tank for normal temperature heat exchange, and the low temperature heat exchange unit includes a low temperature heat exchanger and a second ultra-high pressure gas storage tank; the air inlet of the first ultra-high pressure gas storage tank is connected to the air outlet of the second compression module through the fifth heat dissipation pipeline, the air outlet of the first ultra-high pressure gas storage tank is connected to the first air inlet of the second ultra-high pressure gas storage tank through the sixth heat dissipation pipeline, the first air outlet of the second ultra-high pressure gas storage tank is connected to the air inlet of the energy recovery module through the first insulation pipeline, the air inlet of the low temperature heat exchanger is connected to the second air outlet of the second ultra-high pressure gas storage tank through the seventh heat dissipation pipeline, and the air outlet of the low temperature heat exchanger is connected to the second air inlet of the second ultra-high pressure gas storage tank through the eighth heat dissipation pipeline.

10. A hydrogen refueling station, characterized in that: It comprises a hydrogen refueling station cooling system as described in any one of claims 1 to 9.

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