Gas supply system

Abstract

The invention discloses a gas supply system which comprises a compression device and a gas storage device, and the compression device is suitable for conveying gas to the gas storage device; the buffer container is positioned at the downstream of the gas storage device and is communicated with the gas dispenser; the first valve body is connected between the gas storage device and the buffer container, and the first valve body is opened when the gas pressure in the buffer container is smaller than the required pressure of the gas dispenser. Therefore, by arranging the buffer container and the first valve body, the first valve body can be opened when the gas pressure in the buffer container is smaller than the required pressure of the gas dispenser, so that the gas storage device supplies gas to the buffer container; the high-pressure gas output by the gas storage device can expand and depressurize after entering the buffer container, the pressure of the gas in the buffer container can be increased so as to reach the required pressure of the gas dispenser, and the gas expansion and depressurization cannot cause the temperature rise of the gas, so that the gas does not need to be cooled or only the cooling device needs to work at low power; and energy conservation is facilitated.

Description

Technical Field

[0001] The invention relates to the field of gas supply, and in particular to a gas supply system. Background Art

[0002] In the related art, the gas supply system is used to supply gas to the device to be replenished. For example, the hydrogen supply system can provide hydrogen to the vehicle-mounted gas cylinder pressure. However, according to the hydrogen refueling standard SAEJ-2601, during the hydrogen supply process, the filling pressure of the hydrogen supply system's hydrogen refueling machine needs to change with the change of the vehicle-mounted gas cylinder pressure.

[0003] Conventional hydrogen refueling stations use pressure control valves to reduce the gas pressure delivered from the hydrogen station's gas tank to the hydrogen refueling machine. However, since the hydrogen's coke coefficient is less than 1, the hydrogen's temperature will rise after passing through the pressure control valve, requiring the cooling device to work at high power to cool the hydrogen, resulting in increased energy consumption, which is not conducive to energy conservation. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, an object of the present invention is to provide a gas supply system that is conducive to energy saving.

[0005] The gas supply system according to the present invention includes: a compression device and a gas storage device, wherein the compression device is suitable for compressing gas and delivering the compressed gas to the gas storage device; a buffer container and a gas filling machine, wherein the buffer container is located downstream of the gas storage device and is connected to the gas filling machine, and the gas filling machine is suitable for supplying gas to the device to be replenished with gas; a first valve body, wherein the first valve body is connected between the gas storage device and the buffer container, and the first valve body is constructed to open when the gas pressure in the buffer container is less than the required pressure of the gas filling machine; an energy recovery device, wherein the energy recovery device is located downstream of the first valve body and is connected between the first valve body and the buffer container.

[0006] According to the gas supply system of the present invention, a buffer container and a first valve body are provided. The first valve body can be opened when the gas pressure in the buffer container is lower than the required pressure of the gas filling machine, so that the gas storage device can supply gas to the buffer container. The higher-pressure gas output by the gas storage device will expand and reduce pressure after entering the buffer container and can increase the gas pressure in the buffer container to reach the required pressure of the gas filling machine. Moreover, the expansion and reduction of pressure of the gas will not cause the temperature of the gas to rise, so there is no need to cool the gas or only the cooling device needs to work at a low power, which is beneficial to saving energy.

[0007] In some examples of the present invention, the energy recovery device is drivingly connected to the compression device.

[0008] In some examples of the present invention, the gas supply system further includes: a first cooling device, the first cooling device is located downstream of the buffer container and connected between the buffer container and the gas filling machine, the first cooling device is used to reduce the temperature of the gas flowing to the gas filling machine.

[0009] In some examples of the present invention, there are multiple gas storage devices, the compression device is a variable frequency compression device, the working pressures of at least two of the multiple gas storage devices are different, the multiple gas storage devices are connected in parallel and are selectively connected to the compression device, and the multiple gas storage devices are selectively connected to the buffer container.

[0010] In some examples of the present invention, the multiple gas storage devices include at least a first gas storage device and a second gas storage device, the working pressure of the first gas storage device is a first pressure value, the working pressure of the second gas storage device is a second pressure value, and the first pressure value is less than the second pressure value.

[0011] In some examples of the present invention, there are multiple first valve bodies, and each of the gas storage devices and the buffer container is connected with the first valve body. When the gas pressure in the buffer container is lower than the required pressure of the gas filling machine, the opening and closing of the corresponding first valve body is controlled according to the gas pressure in the buffer container and the working pressure of the gas storage device.

[0012] In some examples of the present invention, the gas pressure in the buffer container is less than the first pressure value, the first valve body corresponding to the first gas storage device is opened, and the first valve body corresponding to the second gas storage device is closed; the gas pressure in the buffer container is greater than or equal to the first pressure value and less than the second pressure value, the first valve body corresponding to the first gas storage device is closed, and the first valve body corresponding to the second gas storage device is opened.

[0013] In some examples of the present invention, the gas supply system also includes: multiple second valve bodies, each of which is connected between the gas storage device and the compression device, and the opening and closing of the corresponding second valve body is controlled according to the gas pressure output by the compression device and the working pressure of the gas storage device.

[0014] In some examples of the present invention, the gas pressure output by the compression device is greater than the first pressure value and less than or equal to the second pressure value, the second valve body corresponding to the first gas storage device is opened, and the first valve body corresponding to the second gas storage device is closed; the gas pressure output by the compression device is greater than the second pressure value, the second valve body corresponding to the first gas storage device is closed, and the first valve body corresponding to the second gas storage device is opened.

[0015] In some examples of the present invention, the gas supply system further includes: a second cooling device, the second cooling device is located upstream of the compression device, and the second cooling device is used to reduce the temperature of the gas flowing to the compression device.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1 Schematic diagram of a gas supply system according to an embodiment of the present invention.

[0019] Reference numerals:

[0020] Gas supply system 100;

[0021] Compression device 10;

[0022] Gas storage device 20; first gas storage device 21; second gas storage device 22; third gas storage device 23;

[0023] Buffer container 30;

[0024] Gas dispenser 40;

[0025] A first valve body 50; a second valve body 51;

[0026] Energy recovery device 60; first cooling device 61; air source 62; second cooling device 63;

[0027] A first pressure sensor 70 ; a second pressure sensor 71 . DETAILED DESCRIPTION

[0028] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0029] Reference below Figure 1 The gas supply system 100 according to an embodiment of the present invention is described. The gas supply system 100 described in this application can be used to provide various gases to a device to be supplemented with gas. This application takes the gas supply system 100 being used to provide hydrogen to a device to be supplemented with gas as an example for description.

[0030] like Figure 1As shown, the gas supply system 100 according to the embodiment of the present invention includes: a compression device 10, a gas storage device 20, a buffer container 30, a gas filling machine 40 and a first valve body 50.

[0031] The compression device 10 is suitable for delivering gas to the gas storage device 20. Specifically, the compression device 10 is suitable for compressing gas and delivering the compressed gas to the gas storage device 20. As some optional embodiments of the present application, the compression device 10 is suitable for delivering hydrogen to the gas storage device 20. Along the flow direction of hydrogen, the compression device 10 can be arranged upstream of the gas storage device 20. A gas source 62 (such as a hydrogen gas source 62) can also be arranged upstream of the compression device 10. The compression device 10 can pressurize the hydrogen in the hydrogen gas source 62 and deliver it to the gas storage device 20. The gas storage device 20 can store hydrogen and output hydrogen at a rated pressure.

[0032] The buffer container 30 is located downstream of the gas storage device 20. The gas storage device 20 can output gas of rated pressure to the buffer container 30. The buffer container 30 is connected to the gas filling machine 40. The gas filling machine 40 is suitable for supplying gas to the device to be filled with gas. For example, the gas filling machine 40 can provide hydrogen gas to the vehicle-mounted gas cylinder under pressure. The first valve body 50 is connected between the gas storage device 20 and the buffer container 30. The first valve body 50 is configured to open when the gas pressure in the buffer container 30 is less than the required pressure of the gas filling machine 40.

[0033] It should be noted that according to the hydrogen refueling standard SAEJ-2601, during the hydrogen supply process, the filling pressure of the gas dispenser 40 of the gas supply system 100 needs to change with the change of the gas supply device (such as the pressure of the vehicle-mounted gas cylinder). That is to say, at the beginning, the pressure of the vehicle-mounted gas cylinder is low, and the filling pressure of the gas dispenser 40 also needs to be low. As the pressure of the vehicle-mounted gas cylinder gradually increases, the filling pressure of the gas dispenser 40 also needs to increase accordingly.

[0034] In the prior art, the gas pressure delivered from the gas storage tank to the hydrogenator is controlled by a pressure control valve. However, since the coke coefficient of hydrogen is less than 1, the temperature of the hydrogen will rise after passing through the pressure control valve, so that the cooling device needs to work at high power to cool the hydrogen, resulting in increased energy consumption, which is not conducive to energy conservation.

[0035] In the present application, a buffer container 30 and a first valve body 50 are provided. The first valve body 50 can be opened when the gas pressure in the buffer container 30 is less than the required pressure of the gas dispenser 40. When the first valve body 50 is opened, the gas storage device 20 is connected to the buffer container 30, and the gas storage device 20 can output gas of rated pressure to the buffer container 30. It can be understood that the gas pressure output by the gas storage device 20 to the buffer container 30 is relatively high. After the gas output by the gas storage device 20 enters the buffer container 30, it will expand and reduce the pressure and can increase the gas pressure in the buffer container 30. In addition, the hydrogen will not increase in temperature after expansion, so there is no need to cool the gas or only requires the cooling device to work at a low power, which is conducive to energy saving.

[0036] It should be explained that even if the gas outputted by the gas storage device 20 expands and reduces pressure after entering the buffer container 30 , this can also increase the gas pressure in the buffer container 30 .

[0037] For example, the rated pressure of the gas output by the gas storage device 20 is 30 MPa, the required pressure of the gas filling machine 40 at a certain moment is 10 MPa, and the gas pressure in the buffer container 30 is 8 MPa. At this time, the gas pressure in the buffer container 30 is less than the required pressure of the gas filling machine 40, the first valve body 50 is opened, and the gas storage device 20 outputs a certain amount of hydrogen with a pressure of 30 MPa to the buffer container 30. The certain amount of hydrogen with a pressure of 30 MPa expands and reduces pressure after entering the buffer container 30, and can increase the gas pressure in the buffer container 30 so that the gas pressure in the buffer container 30 reaches 10 MPa, so that the gas pressure in the buffer container 30 meets the required pressure of the gas filling machine 40 (for example, the gas pressure in the buffer container 30 is equal to the required pressure of the gas filling machine 40).

[0038] After a period of time, at a certain moment the required pressure of the gas filling machine 40 is 15 MPa, and the gas pressure in the buffer container 30 is 10 MPa. At this time, the gas pressure in the buffer container 30 is lower than the required pressure of the gas filling machine 40, and the first valve body 50 opens. The gas storage device 20 outputs a certain amount of hydrogen with a pressure of 30 MPa to the buffer container 30. The certain amount of hydrogen with a pressure of 30 MPa expands and reduces pressure after entering the buffer container 30, and can increase the gas pressure in the buffer container 30 so that the gas pressure in the buffer container 30 reaches 15 MPa, so that the gas pressure in the buffer container 30 meets the required pressure of the gas filling machine 40 (for example, the gas pressure in the buffer container 30 is equal to the required pressure of the gas filling machine 40).

[0039] It should be explained that the first valve body 50 does not necessarily need to be opened all the time. The first valve body 50 can be opened intermittently, that is, the first valve body 50 can be closed after being opened for a certain period of time. For example, when the gas pressure in the buffer container 30 meets the required pressure of the gas filling machine 40 (for example, the gas pressure in the buffer container 30 is equal to the required pressure of the gas filling machine 40), the first valve body 50 can be controlled to close.

[0040] As some optional embodiments of the present application, the gas supply system 100 may further include a controller, which can be used to obtain the required pressure of the gas filling machine 40, and a first pressure sensor 70 may be provided in the buffer container 30, and the first pressure sensor 70 is configured to detect the gas pressure in the buffer container 30. The controller can be used to obtain the gas pressure information detected by the first pressure sensor 70, and the controller can control the opening and closing of the first valve body 50 according to the required pressure of the gas filling machine 40 and the gas pressure in the buffer container 30.

[0041] In short, the present application replaces the pressure control valve in the prior art (the pressure control valve is an entropy increase throttling device) by providing a buffer container 30 and a first valve body 50, so that the inflation pressure of the gas filling machine 40 can meet the needs without increasing the temperature of the hydrogen, thereby eliminating the need to cool the hydrogen or requiring the cooling device to operate at low power, which is beneficial to energy saving.

[0042] It is understandable that the present application may provide a cooling device to cool the hydrogen flowing from the buffer container 30 to the gas dispenser 40, or may not provide a cooling device between the buffer container 30 and the gas dispenser 40 according to actual conditions.

[0043] Therefore, by setting the buffer container 30 and the first valve body 50, the first valve body 50 can be opened when the gas pressure in the buffer container 30 is lower than the required pressure of the gas filling machine 40, so that the gas storage device 20 supplies gas to the buffer container 30. The higher-pressure gas output by the gas storage device 20 will expand and reduce pressure after entering the buffer container 30 and can increase the gas pressure in the buffer container 30 to reach the required pressure of the gas filling machine 40. Moreover, the expansion and pressure reduction of the gas will not cause the temperature of the gas to rise, so that there is no need to cool the gas or only the cooling device needs to work at a low power, which is beneficial to saving energy.

[0044] It is understandable that, since the gas dispenser 40 needs to provide gas whose pressure gradually increases over time during actual operation, the gas pressure in the buffer container 30 will also gradually increase over time.

[0045] In some embodiments of the present invention, Figure 1As shown, the gas supply system 100 may further include: an energy recovery device 60, which may be located downstream of the first valve body 50, and the energy recovery device 60 may be connected between the first valve body 50 and the buffer container 30. When the gas storage device 20 supplies gas to the buffer container 30, the gas with a higher pressure output by the gas storage device 20 can drive the energy recovery device 60 to work, so as to recover a part of the energy of the gas with a higher pressure output by the gas storage device 20.

[0046] It is understandable that after the high-pressure gas output by the gas storage device 20 passes through the energy recovery device 60, the pressure of the gas output by the gas storage device 20 will be slightly reduced, which meets the requirement of reducing the pressure of the gas after entering the buffer container 30, and can also recover part of the energy, which is beneficial to saving energy.

[0047] As some optional embodiments of the present application, the energy recovery device 60 may be configured as a turbine. As some optional embodiments of the present application, the energy recovery device 60 may be configured as a generator.

[0048] In some embodiments of the present invention, the energy recovery device 60 can be connected to the compression device 10 in a transmission manner to provide the energy recovered by the energy recovery device 60 to the compression device 10. As some optional embodiments of the present application, the energy recovery device 60 can be constructed as a turbine, and the gas with a higher pressure output by the gas storage device 20 can drive the turbine of the turbine to rotate, and the turbine of the turbine can be connected to the impeller of the compression device 10 in a transmission manner, and the turbine of the turbine can drive the impeller of the compression device 10 to rotate when the turbine of the turbine rotates. Such a setting can reduce the power used by the compressor 10, which is conducive to saving energy consumption.

[0049] As some optional embodiments of the present application, the energy recovery device 60 may be transmission-connected to a generator so that the energy recovered by the energy recovery device 60 may be used for power generation.

[0050] In some embodiments of the present invention, Figure 1 As shown, the gas supply system 100 may further include: a first cooling device 61, which may be located downstream of the buffer container 30, and the first cooling device 61 may be connected between the buffer container 30 and the gas dispenser 40, and the first cooling device 61 is used to reduce the temperature of the gas flowing to the gas dispenser 40. In other words, the hydrogen delivered by the buffer container 30 to the gas dispenser 40 can flow through the first cooling device 61, and the first cooling device 61 can reduce the temperature of the hydrogen flowing through it when it is started, so that the hydrogen provided to the gas-supplementing device meets the use requirements.

[0051] It should be explained that if the temperature of the hydrogen delivered by the buffer container 30 to the gas dispenser 40 is not high, the first cooling device 61 may not work. Moreover, by providing the buffer container 30 and the first valve body 50, the first cooling device 61 can work at low power, which is beneficial to energy saving.

[0052] In some embodiments of the present invention, Figure 1 As shown, the number of the gas storage devices 20 can be set to multiple, the compression device 10 can be constructed as a variable frequency compression device 10, the working pressures of at least two of the multiple gas storage devices 20 are different, the multiple gas storage devices 20 are arranged in parallel, and the multiple gas storage devices 20 are selectively connected to the compression device 10.

[0053] As some optional embodiments of the present application, the working pressures of the multiple gas storage devices 20 are different, and the working pressure of the gas storage device 20 can be understood as the rated pressure of the gas output by the gas storage device 20. It can be understood that the variable frequency compression device 10 can output hydrogen with different pressures, for example, the variable frequency compression device 10 can gradually output hydrogen from low pressure to high pressure.

[0054] It should be explained that the compressor of the existing hydrogen refueling station is a fixed-frequency compressor, and there is only one gas storage tank. The fixed-frequency compressor needs to output high-pressure hydrogen to the gas storage tank to meet the use requirements, which will lead to high energy consumption of the compressor. In the present application, by setting a plurality of gas storage devices 20 with different working pressures, and constructing the compression device 10 as a variable frequency compression device 10, the variable frequency compression device 10 can be selectively connected to one or more of the gas storage devices 20 according to the pressure of the hydrogen output by the variable frequency compression device 10, which is conducive to reducing the energy consumption of the variable frequency compression device 10.

[0055] For example, as some optional embodiments of the present application, the plurality of gas storage devices 20 may include at least a first gas storage device 21 and a second gas storage device 22, the working pressure of the first gas storage device 21 may be a first pressure value, the working pressure of the second gas storage device 22 may be a second pressure value, and the first pressure value is less than the second pressure value. As some optional embodiments of the present application, the first pressure value may be 15 MPa, and the second pressure value may be 30 MPa.

[0056] When the pressure of hydrogen output by the compression device 10 is greater than 15 MPa (first pressure value) and less than or equal to 30 MPa (second pressure value), the compression device 10 is connected to the first gas storage device 21, and the compression device 10 is not connected to the second gas storage device 22. At this time, the compression device 10 can supply gas to the first gas storage device 21. When the pressure of hydrogen output by the compression device 10 is greater than 30 MPa (second pressure value), the compression device 10 is not connected to the first gas storage device 21, and the compression device 10 is connected to the second gas storage device 22. At this time, the compression device 10 can supply gas to the second gas storage device 22. Compared with the prior art, the prior art can only output hydrogen greater than 30 MPa to supply gas to the gas storage tank.

[0057] Therefore, the present application is beneficial to reduce the energy consumption of the compression device 10 and save energy by setting up multiple gas storage devices 20 with different working pressures and constructing the compression device 10 as a variable frequency compression device 10. Moreover, multiple gas storage devices 20 can be selectively connected to the buffer container 30. It can be understood that by setting up multiple gas storage devices 20 with different working pressures, gas storage devices 20 with different working pressures can be selected to supply gas to the buffer container 30 according to the gas pressure value in the buffer container 30. For example, if the gas pressure value in the buffer container 30 is less than 15 MPa (first pressure value), the buffer container 30 can be supplied with gas through the first gas storage device 21. If the gas pressure value in the buffer container 30 is greater than or equal to 15 MPa (first pressure value) and less than 30 MPa (second pressure value), the buffer container 30 can be supplied with gas through the second gas storage device 22.

[0058] Moreover, one variable frequency compression device 10 can supply gas to multiple gas storage devices 20, which is helpful to reduce costs.

[0059] As some optional embodiments of the present application, Figure 1 As shown, the plurality of gas storage devices 20 may include a first gas storage device 21, a second gas storage device 22, and a third gas storage device 23. The working pressure of the first gas storage device 21 is a first pressure value, the working pressure of the second gas storage device 22 is a second pressure value, and the working pressure of the third gas storage device 23 is a third pressure value. The first pressure value is less than the second pressure value, and the second pressure value is less than the third pressure value. As some optional embodiments of the present application, the first pressure value may be 15 MPa, the second pressure value may be 30 MPa, and the third pressure value may be 50 MPa.

[0060] When the pressure of the hydrogen output by the compression device 10 is greater than 15 MPa (first pressure value) and less than or equal to 30 MPa (second pressure value), the compression device 10 is connected to the first gas storage device 21, the compression device 10 is not connected to the second gas storage device 22, and the compression device 10 is not connected to the third gas storage device 23. At this time, the compression device 10 can supply gas to the first gas storage device 21.

[0061] When the pressure of the hydrogen output by the compression device 10 is greater than 30 MPa (the second pressure value) and less than or equal to 50 MPa (the third pressure value), the compression device 10 is not connected to the first gas storage device 21, the compression device 10 is connected to the second gas storage device 22, and the compression device 10 is not connected to the third gas storage device 23. At this time, the compression device 10 can supply gas to the second gas storage device 22.

[0062] When the pressure of the hydrogen output by the compression device 10 is greater than 50 MPa (the third pressure value), the compression device 10 is not connected to the first gas storage device 21, the compression device 10 is not connected to the second gas storage device 22, and the compression device 10 is connected to the third gas storage device 23. At this time, the compression device 10 can supply gas to the third gas storage device 23.

[0063] In some embodiments of the present invention, Figure 1 As shown, the number of first valve bodies 50 can be multiple, and a first valve body 50 can be connected between each gas storage device 20 and the buffer container 30. When the gas pressure in the buffer container 30 is less than the required pressure of the gas dispenser 40, the corresponding first valve body 50 can be controlled to open and close according to the gas pressure in the buffer container 30 and the working pressure of the gas storage device 20. As some optional embodiments of the present application, the number of first valve bodies 50 can be the same as the number of gas storage devices 20, and multiple first valve bodies 50 can be set in a one-to-one correspondence with multiple gas storage devices 20.

[0064] As some optional embodiments of the present application, the plurality of gas storage devices 20 may include a first gas storage device 21 and a second gas storage device 22. The working pressure of the first gas storage device 21 may be a first pressure value, and the working pressure of the second gas storage device 22 may be a second pressure value, and the first pressure value is less than the second pressure value. As some optional embodiments of the present application, the first pressure value may be 15 MPa, and the second pressure value may be 30 MPa.

[0065] A first valve body 50 may be connected between the first gas storage device 21 and the buffer container 30, and a first valve body 50 may be connected between the second gas storage device 22 and the buffer container 30. When the gas pressure in the buffer container 30 is less than the required pressure of the gas dispenser 40, the gas pressure in the buffer container 30 may be obtained. If the gas pressure in the buffer container 30 is less than 15 MPa (first pressure value), the first valve body 50 corresponding to the first gas storage device 21 may be opened, and the first valve body 50 corresponding to the second gas storage device 22 may be closed. At this time, the first gas storage device 21 may provide 15 MPa (first pressure value) of hydrogen to the buffer container 30. The 15 MPa (first pressure value) of hydrogen expands and depressurizes after entering the buffer container 30, and the gas pressure in the buffer container 30 may be increased so that the gas pressure in the buffer container 30 meets the required pressure of the gas dispenser 40.

[0066] If the gas pressure in the buffer container 30 is greater than or equal to 15 MPa (first pressure value) and less than 30 MPa (second pressure value), the first valve body 50 corresponding to the first gas storage device 21 can be closed, and the first valve body 50 corresponding to the second gas storage device 22 can be opened. At this time, the second gas storage device 22 can provide 30 MPa (second pressure value) of hydrogen to the buffer container 30. After the 30 MPa (second pressure value) of hydrogen enters the buffer container 30, it expands and reduces the pressure, and can increase the gas pressure in the buffer container 30 so that the gas pressure in the buffer container 30 meets the required pressure of the gas filling machine 40.

[0067] As some optional embodiments of the present application, Figure 1 As shown, the plurality of gas storage devices 20 may include a first gas storage device 21, a second gas storage device 22, and a third gas storage device 23. The working pressure of the first gas storage device 21 is a first pressure value, the working pressure of the second gas storage device 22 is a second pressure value, and the working pressure of the third gas storage device 23 is a third pressure value. The first pressure value is less than the second pressure value, and the second pressure value is less than the third pressure value. As some optional embodiments of the present application, the first pressure value may be 15 MPa, the second pressure value may be 30 MPa, and the third pressure value may be 50 MPa.

[0068] A first valve body 50 may be connected between the first gas storage device 21 and the buffer container 30, a first valve body 50 may be connected between the second gas storage device 22 and the buffer container 30, and a first valve body 50 may be connected between the third gas storage device 23 and the buffer container 30. When the gas pressure in the buffer container 30 is less than the required pressure of the gas dispenser 40, the gas pressure in the buffer container 30 may be obtained. If the gas pressure in the buffer container 30 is less than 15 MPa (first pressure value), the first valve body 50 corresponding to the first gas storage device 21 may be opened, the first valve body 50 corresponding to the second gas storage device 22 may be closed, and the first valve body 50 corresponding to the third gas storage device 23 may be closed. At this time, the first gas storage device 21 may provide 15 MPa (first pressure value) of hydrogen to the buffer container 30.

[0069] If the gas pressure in the buffer container 30 is greater than or equal to 15 MPa (first pressure value) and less than 30 MPa (second pressure value), the first valve body 50 corresponding to the first gas storage device 21 can be closed, the first valve body 50 corresponding to the second gas storage device 22 can be opened, and the first valve body 50 corresponding to the third gas storage device 23 can be closed. At this time, the second gas storage device 22 can provide 30 MPa (second pressure value) of hydrogen to the buffer container 30. If the gas pressure in the buffer container 30 is greater than or equal to 30 MPa (second pressure value) and less than 50 MPa (third pressure value), the first valve body 50 corresponding to the first gas storage device 21 can be closed, the first valve body 50 corresponding to the second gas storage device 22 can be closed, and the first valve body 50 corresponding to the third gas storage device 23 can be opened. At this time, the third gas storage device 23 can provide 50 MPa (third pressure value) of hydrogen to the buffer container 30. Such an arrangement can control the opening and closing of the corresponding first valve body 50 according to the gas pressure in the buffer container 30 and the working pressure of the gas storage device 20 to provide hydrogen to the buffer container 30, thereby providing hydrogen with a suitable pressure value to the buffer container 30.

[0070] In some embodiments of the present invention, Figure 1 As shown, the gas supply system 100 may further include: a plurality of second valve bodies 51, each of which may be connected between the gas storage device 20 and the compression device 10, and the corresponding second valve body 51 may be controlled to open or close according to the gas pressure output by the compression device 10 and the working pressure of the gas storage device 20. As some optional embodiments of the present application, the number of the second valve bodies 51 may be the same as the number of the gas storage devices 20, and the plurality of second valve bodies 51 may be arranged in a one-to-one correspondence with the plurality of gas storage devices 20.

[0071] For example, as some optional embodiments of the present application, the plurality of gas storage devices 20 may include at least a first gas storage device 21 and a second gas storage device 22, the working pressure of the first gas storage device 21 may be a first pressure value, the working pressure of the second gas storage device 22 may be a second pressure value, and the first pressure value is less than the second pressure value. As some optional embodiments of the present application, the first pressure value may be 15 MPa, and the second pressure value may be 30 MPa.

[0072] When the pressure of the hydrogen output by the compression device 10 is greater than 15 MPa (first pressure value) and less than or equal to 30 MPa (second pressure value), the second valve body 51 corresponding to the first gas storage device 21 is opened, and the second valve body 51 corresponding to the second gas storage device 22 is closed. At this time, the compression device 10 can supply gas to the first gas storage device 21. When the pressure of the hydrogen output by the compression device 10 is greater than 30 MPa (second pressure value), the second valve body 51 corresponding to the first gas storage device 21 is closed, and the second valve body 51 corresponding to the second gas storage device 22 is opened. At this time, the compression device 10 can supply gas to the second gas storage device 22.

[0073] As some optional embodiments of the present application, Figure 1 As shown, the plurality of gas storage devices 20 may include a first gas storage device 21, a second gas storage device 22, and a third gas storage device 23. The working pressure of the first gas storage device 21 is a first pressure value, the working pressure of the second gas storage device 22 is a second pressure value, and the working pressure of the third gas storage device 23 is a third pressure value. The first pressure value is less than the second pressure value, and the second pressure value is less than the third pressure value. As some optional embodiments of the present application, the first pressure value may be 15 MPa, the second pressure value may be 30 MPa, and the third pressure value may be 50 MPa.

[0074] When the pressure of the hydrogen output by the compression device 10 is greater than 15 MPa (first pressure value) and less than or equal to 30 MPa (second pressure value), the second valve body 51 corresponding to the first gas storage device 21 is opened, the second valve body 51 corresponding to the second gas storage device 22 is closed, and the second valve body 51 corresponding to the third gas storage device 23 is closed. At this time, the compression device 10 can supply gas to the first gas storage device 21.

[0075] When the pressure of the hydrogen output by the compression device 10 is greater than 30 MPa (the second pressure value) and less than or equal to 50 MPa (the third pressure value), the second valve body 51 corresponding to the first gas storage device 21 is closed, the second valve body 51 corresponding to the second gas storage device 22 is opened, and the second valve body 51 corresponding to the third gas storage device 23 is closed. At this time, the compression device 10 can supply gas to the second gas storage device 22.

[0076] When the pressure of hydrogen output by the compression device 10 is greater than 50 MPa (the third pressure value), the second valve body 51 corresponding to the first gas storage device 21 is closed, the second valve body 51 corresponding to the second gas storage device 22 is closed, and the second valve body 51 corresponding to the third gas storage device 23 is opened, and at this time, the compression device 10 can supply gas to the third gas storage device 23. In this way, one variable frequency compression device 10 can supply gas to multiple gas storage devices 20, which is conducive to reducing costs, and such a setting is conducive to reducing the energy consumption of the compression device 10 and saving energy.

[0077] As some optional embodiments of the present application, Figure 1 As shown, a second pressure sensor 71 can be provided between the second valve body 51 and the compression device 10. The second pressure sensor 71 can be constructed to detect the gas pressure output by the compression device 10. The controller can be used to obtain the gas pressure information detected by the second pressure sensor 71. The controller can control the opening and closing of multiple second valve bodies 51 according to the gas pressure output by the compression device 10.

[0078] In some embodiments of the present invention, Figure 1 As shown, the gas supply system 100 may further include: a second cooling device 63 , which may be located upstream of the compression device 10 , and may be used to reduce the temperature of the gas flowing to the compression device 10 .

[0079] As some optional embodiments of the present application, the second cooling device 63 can be connected between the compression device 10 and the gas source 62, that is, the hydrogen delivered by the gas source 62 to the compression device 10 can flow through the second cooling device 63. When the second cooling device 63 is started, the temperature of the hydrogen flowing through it can be reduced. Such a setting can make the temperature of the hydrogen flowing into the compression device 10 lower, which can improve the working efficiency of the compression device 10 and avoid safety accidents.

[0080] Furthermore, through the cooperation between the first cooling device 61 and the second cooling device 63, the temperature of the hydrogen flowing into the buffer container 30 can be effectively reduced, and this two-stage cooling method is conducive to reducing cooling power consumption.

[0081] As some optional embodiments of the present application, the number of the energy recovery device 60 may be one, and the energy recovery device 60 may be located downstream of the plurality of first valve bodies 50, or Figure 1 As shown, the number of energy recovery devices 60 can be the same as the number of first valve bodies 50, and multiple energy recovery devices 60 can be set in a one-to-one correspondence with multiple first valve bodies 50. Specifically, an energy recovery device 60 can be correspondingly set downstream of each first valve body 50.

[0082] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0083] In the description of the present invention, "first feature" or "second feature" may include one or more of the features.

[0084] In the description of the present invention, "plurality" means two or more.

[0085] In the description of the present invention, a first feature being “on” or “under” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact with each other but are in contact with each other via another feature therebetween.

[0086] In the description of the present invention, “on”, “over” and “above” a first feature from a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0087] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0088] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A gas supply system, characterized in that: include: A compression device and a gas storage device, wherein the compression device is adapted to compress gas and deliver the compressed gas to the gas storage device; A buffer container and a gas filling machine, wherein the buffer container is located downstream of the gas storage device and is connected to the gas filling machine, and the gas filling machine is suitable for supplying gas to the device to be filled with gas; A first valve body, the first valve body is connected between the gas storage device and the buffer container, and the first valve body is configured to open when the gas pressure in the buffer container is lower than the required pressure of the gas dispenser; An energy recovery device is located downstream of the first valve body and is connected between the first valve body and the buffer container.

2. The gas supply system according to claim 1, characterized in that: The energy recovery device is drivingly connected to the compression device.

3. The gas supply system according to claim 1, characterized in that: Also includes: A first cooling device, the first cooling device is located downstream of the buffer container and connected between the buffer container and the gas dispenser, and the first cooling device is used to reduce the temperature of the gas flowing to the gas dispenser.

4. The gas supply system according to any one of claims 1 to 3, characterized in that: There are multiple gas storage devices, and the compression device is a variable frequency compression device. The working pressures of at least two of the multiple gas storage devices are different. The multiple gas storage devices are connected in parallel and are selectively connected to the compression device, and the multiple gas storage devices are selectively connected to the buffer container.

5. The gas supply system according to claim 4, characterized in that: The multiple gas storage devices include at least a first gas storage device and a second gas storage device, the working pressure of the first gas storage device is a first pressure value, the working pressure of the second gas storage device is a second pressure value, and the first pressure value is less than the second pressure value.

6. The gas supply system according to claim 5, characterized in that: There are multiple first valve bodies, and each of the first valve bodies is connected between the gas storage device and the buffer container. When the gas pressure in the buffer container is lower than the required pressure of the gas filling machine, the opening and closing of the corresponding first valve body is controlled according to the gas pressure in the buffer container and the working pressure of the gas storage device.

7. The gas supply system according to claim 6, characterized in that: The gas pressure in the buffer container is lower than the first pressure value, the first valve body corresponding to the first gas storage device is opened, and the first valve body corresponding to the second gas storage device is closed; The gas pressure in the buffer container is greater than or equal to the first pressure value and less than the second pressure value, the first valve body corresponding to the first gas storage device is closed, and the first valve body corresponding to the second gas storage device is opened.

8. The gas supply system according to claim 5, characterized in that: Also includes: A plurality of second valve bodies are provided, each of which is connected between the gas storage device and the compression device, and the opening and closing of the corresponding second valve body is controlled according to the gas pressure output by the compression device and the working pressure of the gas storage device.

9. The gas supply system according to claim 8, characterized in that: The gas pressure output by the compression device is greater than the first pressure value and less than or equal to the second pressure value, the second valve body corresponding to the first gas storage device is opened, and the first valve body corresponding to the second gas storage device is closed; The gas pressure output by the compression device is greater than the second pressure value, the second valve body corresponding to the first gas storage device is closed, and the first valve body corresponding to the second gas storage device is opened.

10. The gas supply system according to any one of claims 1 to 3, characterized in that: Also includes: A second cooling device, the second cooling device is located upstream of the compression device, and the second cooling device is used to reduce the temperature of the gas flowing to the compression device.

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