Gas filling system and gas filling method

Abstract

A gas filling system and a gas filling method, relating to the technical field of carbon dioxide capture and transportation. The gas filling system comprises a storage tank, a tank to be filled, an intermediate tank, a first pipe, a second pipe, a vacuumizing assembly, and a pressure measuring instrument. An exhaust pipe provided with a first valve is connected to the storage tank; an air inlet pipe provided with a second valve is connected to the tank to be filled; the intermediate tank is provided with a transfer cavity communicated with the first pipe and the second pipe; the other end of the first pipe is connected to the exhaust pipe; the other end of the second pipe is connected to the air inlet pipe; the vacuumizing assembly is arranged in the intermediate tank and is used for vacuumizing the transfer cavity; and the pressure measuring instrument is arranged in the intermediate tank and is used for monitoring the pressure of the transfer cavity. The gas filling system can detect the connection sealing performance of filling piping before gas filling, thereby eliminating potential leakage hazards that may occur, ensuring the connection sealing performance of the filling piping and the stability during gas filling, and improving gas filling efficiency.

Description

Gas filling systems and gas filling methods

[0001] Cross-reference to related applications

[0002] This disclosure is based on and claims priority to Chinese Patent Application No. 202410996815.3, filed on July 24, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to the field of carbon dioxide capture and transport technology, and more specifically, to a gas filling system and a gas filling method. Background Technology

[0004] In carbon capture, utilization and storage technology, when a carbon dioxide capture system is in operation, the collected carbon dioxide is often temporarily stored in a large storage tank with a large volume. When it is necessary to transfer the carbon dioxide, the carbon dioxide in the large storage tank is filled into a transportable small tank, and then the small tank is transported.

[0005] In related technologies, when filling carbon dioxide from a large storage tank into a small tank, the tank is often directly connected via a flange sealing plate. This makes it impossible to detect the sealing status of the flange connection. Since the carbon dioxide in the large storage tank is under high pressure, there is a large pressure difference between the large and small tanks during the filling process. If gas leakage occurs at the flange connection, it will seriously affect the gas filling efficiency and may also cause injury to personnel and damage to equipment, posing a significant safety hazard. Summary of the Invention

[0006] This disclosure aims to at least partially address one of the technical problems in the related art.

[0007] Therefore, this disclosure proposes a gas filling system that can detect the connection sealing of the filling pipeline before gas filling, eliminate potential leakage hazards that may occur during the gas filling process, ensure the overall connection sealing of the filling pipeline and the stability during gas filling, and improve the efficiency of gas filling.

[0008] This disclosure also proposes a gas filling method.

[0009] The gas filling system of this disclosure includes:

[0010] A storage tank, the storage tank being connected to an exhaust pipe, the exhaust pipe being provided with a first valve for opening and closing the exhaust pipe;

[0011] A can to be filled, wherein the can is connected to an air inlet pipe and the air inlet pipe is provided with a second valve for opening and closing the air inlet pipe;

[0012] The system includes an intermediate tank, a first pipe, and a second pipe. The intermediate tank is fixedly disposed between the first pipe and the second pipe. The intermediate tank has a transfer chamber that is connected to the first pipe and the second pipe. The other end of the first pipe is detachably connected to the exhaust pipe, and the other end of the second pipe is detachably connected to the intake pipe.

[0013] A vacuum pumping assembly is located in the intermediate tank and is used to evacuate the transfer chamber.

[0014] A pressure measuring instrument is installed in the intermediate tank and used to monitor the pressure inside the transfer chamber.

[0015] The gas filling system of this disclosure can detect the connection and sealing of the filling pipeline before gas filling, eliminate potential leakage hazards that may occur during the gas filling process, ensure the overall connection and sealing of the filling pipeline and the stability during gas filling, and improve the efficiency of gas filling.

[0016] In some embodiments, the volume of the transfer chamber is 20%-30% of the volume of the filling tank.

[0017] In this embodiment, the volume of the transfer chamber is limited to ensure effective monitoring of pressure changes within the transfer chamber, while avoiding an excessively large intermediate tank that would occupy too much space and thus reduce costs.

[0018] In some embodiments, the first pipe is provided with a third valve, and / or the second pipe is provided with a fourth valve.

[0019] In this embodiment, a third valve and / or a fourth valve are provided. If a leak is found during the monitoring of the sealing performance, the location of the leak can be screened again through the third valve or the fourth valve, which facilitates reinstallation and maintenance, so as to ensure the sealing performance during filling. When a fourth valve is provided on the second pipe, after the first filling of gas, the gas in the transfer chamber can be kept as the gas to be filled, reducing the impurities that may exist in the filling tank during refilling.

[0020] In some embodiments, the vacuum assembly includes a third tube, a fifth valve, and a vacuum pump. The third tube is located in the intermediate tank and communicates with the transfer chamber. The fifth valve is located in the third tube and is used to control the opening and closing of the third tube. The vacuum pump is located in the third tube and is situated on the side of the fifth valve away from the intermediate tank.

[0021] In this embodiment, the vacuum pumping assembly is configured as a third tube, a fifth valve, and a vacuum pump. The structure is simple and easy to operate. After the transfer chamber is evacuated, the third tube can be sealed to ensure the sealing of the connection position of the third tube and eliminate the influence of the third tube on the pressure change of the transfer chamber.

[0022] The gas filling method of this disclosure includes the gas filling system of any of the above embodiments, and the gas filling method includes the following steps:

[0023] S1: Install an intermediate tank, a first pipe, and a second pipe at the end of the exhaust pipe of the storage tank, and connect the air inlet pipe of the tank to be filled to the second pipe;

[0024] S2: Check the sealing of the connection between the first tube and the storage tank and the connection between the second tube and the filling tank using the vacuum assembly. If there is a leak, return to step S1 and reinstall the leaking part. If the seal is good, proceed to step S3.

[0025] S3: Open the first valve to allow the gas in the storage tank to enter the transfer chamber. After the pressure in the transfer chamber stabilizes, close the first valve and observe whether the pressure measuring instrument value changes. If the pressure measuring instrument value remains unchanged, the seal is good, and proceed to step S4. If the pressure measuring instrument value changes, there is a leak, and repeat step S1.

[0026] S4: Open the first valve and the second valve, and the gas in the storage tank is filled into the tank to be filled through the first pipe and the second pipe.

[0027] The gas filling method of this disclosure is easy to operate. By performing dual testing on the transfer chamber under negative pressure after vacuuming and under high pressure after being filled with the gas to be filled, the results are reliable, ensuring the sealing of the connection between the first tube and the storage tank and the second tube and the tube to be filled, as well as the safety and stability during filling, thereby improving the gas filling efficiency.

[0028] In some embodiments, the vacuum assembly includes a third pipe, a fifth valve, and a vacuum pump. The third pipe is connected to the transfer chamber, the fifth valve is located in the third pipe, and the vacuum pump is located in the third pipe. In step S2, the fifth valve is opened, and the vacuum pump is used to perform vacuuming on the transfer chamber. When the pressure in the transfer chamber reaches a set value, the fifth valve and the vacuum pump are closed, and the pressure measuring instrument value is observed to see if it changes. If the pressure measuring instrument value remains unchanged, the seal is good; if the pressure measuring instrument value changes, there is a leak.

[0029] In some embodiments, the first pipe is provided with a third valve. In step S2, when there is a leak, the third valve is closed. If the pressure measuring instrument value continues to change, there is a leak at the connection between the second pipe and the filling tank. If the pressure measuring instrument value remains unchanged, there is a leak at the connection between the first pipe and the storage tank.

[0030] In some embodiments, in step S3, when a leak exists, the third valve is closed. If the pressure gauge reading continues to change, there is a leak at the connection between the second pipe and the filling tank. If the pressure gauge reading remains unchanged, there is a leak at the connection between the first pipe and the storage tank.

[0031] In some embodiments, the second pipe is provided with a fourth valve. In step S2, when there is a leak, the fourth valve is closed. If the pressure measuring instrument value continues to change, there is a leak at the connection between the first pipe and the storage tank. If the pressure measuring instrument value remains unchanged, there is a leak at the connection between the second pipe and the filling tank.

[0032] In some embodiments, in step S3, when a leak is present, the fourth valve is closed. If the pressure gauge reading continues to change, there is a leak at the connection between the first pipe and the storage tank. If the pressure gauge reading remains unchanged, there is a leak at the connection between the second pipe and the tank to be filled. Attached Figure Description

[0033] Figure 1 is a schematic diagram of the structure of a gas filling system according to an embodiment of the present disclosure.

[0034] Reference numerals: Storage tank 1; Filling tank 2; Intermediate tank 3; First pipe 4; Second pipe 5; First valve 6; Second valve 7; Third valve 8; Fourth valve 9; Third pipe 10; Fifth valve 11; Vacuum pump 12. Detailed Implementation

[0035] Embodiments of this disclosure are described in detail below, with examples of these embodiments illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this disclosure, and should not be construed as limiting it.

[0036] As shown in Figure 1, the gas filling system of this embodiment includes a storage tank 1, a filling tank 2, an intermediate tank 3, a first pipe 4, a second pipe 5, a vacuuming assembly, and a pressure measuring instrument. The storage tank 1 is connected to an exhaust pipe, and the exhaust pipe is provided with a first valve 6 for opening and closing the exhaust pipe. The filling tank 2 is connected to an air inlet pipe, and the air inlet pipe is provided with a second valve 7 for opening and closing the air inlet pipe. The intermediate tank 3 is fixedly disposed between the first pipe 4 and the second pipe 5. The intermediate tank 3 has a transfer chamber and the transfer chamber is connected to the first pipe 4 and the second pipe 5. The other end of the first pipe 4 is detachably connected to the exhaust pipe, and the other end of the second pipe 5 is detachably connected to the air inlet pipe. The vacuuming assembly is disposed in the intermediate tank 3 and is used to evacuate the transfer chamber. The pressure measuring instrument is disposed in the intermediate tank 3 and is used to monitor the pressure in the transfer chamber.

[0037] In use, the gas filling system of this embodiment closes the first valve 6 and the second valve 7, and evacuates the transfer chamber until the gas pressure in the transfer chamber reaches the set negative pressure value. The pressure in the transfer chamber is monitored by a pressure measuring instrument. If the pressure measuring instrument value changes, there is a leak, and the connection between the first pipe 4 and the storage tank 1, and the connection between the second pipe 5 and the filling tank 2 need to be reinstalled. If the pressure measuring instrument value remains unchanged, the seal is good. The first valve 6 is opened to allow gas from the storage tank 1 to enter the transfer chamber. After the pressure in the transfer chamber stabilizes, the first valve 6 is closed, and the pressure measuring instrument value is observed to see if it changes. If the pressure measuring instrument value changes, there is a leak, and the connection between the first pipe 4 and the storage tank 1, and the connection between the second pipe 5 and the filling tank 2 need to be reinstalled. If the pressure measuring instrument value remains unchanged, the seal is good. The first valve 6 and the second valve 7 are opened, and the gas in the storage tank 1 is filled into the filling tank 2 along the first pipe 4 and the second pipe 5.

[0038] The gas filling system of this disclosure performs dual testing on the transfer chamber under negative pressure after vacuuming and under high pressure after being filled with the gas to be filled. The results are reliable, eliminating the potential leakage hazards that may occur during the gas filling process, ensuring the sealing of the connection between the first pipe 4 and the storage tank 1 and the second pipe 5 and the tank to be filled 2, as well as the stability and safety during gas filling, and improving the efficiency of gas filling.

[0039] In some embodiments, the volume of the transfer chamber is 20%-30% of the volume of the filling tank 2. Limiting the volume of the transfer chamber ensures effective monitoring of pressure changes within the transfer chamber while preventing the intermediate tank 3 from becoming too large and occupying too much space, thus reducing costs.

[0040] In some embodiments, as shown in FIG1, a third valve 8 is provided on the first pipe 4. When a leak is found during the monitoring of sealing performance, the connection between the first pipe 4 and the storage tank 1 can be sealed by the third valve 8 and the first valve 6. The sealing performance of the connection between the second pipe 5 and the filling tank 2 can be tested under negative pressure or high pressure gas environment, and the location of the leak can be screened again for easy reinstallation and maintenance, so as to ensure the sealing performance during filling.

[0041] In some embodiments, as shown in FIG1, a fourth valve 9 is provided on the second pipe 5. When a leak is detected during the monitoring of sealing, the connection between the second pipe 5 and the filling tank 2 can be sealed by the fourth valve 9 and the second valve 7. The sealing of the connection between the first pipe 4 and the storage tank 1 can be tested under negative pressure or high pressure gas environment, and the location of the leak can be screened again for easy reinstallation and maintenance, so as to ensure the sealing during filling. When the fourth valve 9 is provided on the second pipe 5, after the first filling of gas, the gas in the transfer chamber can be kept as the gas to be filled, reducing the impurities that may exist in the filling tank 2 during refilling.

[0042] In some embodiments, as shown in FIG1, the vacuum assembly includes a third tube 10, a fifth valve 11 and a vacuum pump 12. The third tube 10 is located in the intermediate tank 3 and communicates with the transfer chamber. The fifth valve 11 is located in the third tube 10 and is used to control the opening and closing of the third tube 10. The vacuum pump 12 is located in the third tube 10 and is located on the side of the fifth valve 11 away from the intermediate tank 3.

[0043] The vacuum assembly consists of a third tube 10, a fifth valve 11, and a vacuum pump 12. It has a simple structure and is easy to operate. After the transfer chamber is evacuated, the third tube 10 can be sealed to ensure the sealing of the connection position of the third tube 10 and eliminate the influence of the third tube 10 on the pressure change of the transfer chamber.

[0044] The following describes a gas filling method according to an embodiment of the present disclosure.

[0045] The gas filling method of this disclosure includes the gas filling system of any of the above embodiments, and includes the following steps:

[0046] S1: Install intermediate tank 3, first pipe 4 and second pipe 5 at the end of the exhaust pipe of storage tank 1, and connect the air inlet pipe of the tank to be filled 2 to the second pipe 5;

[0047] S2: Check the sealing of the connection between the first tube 4 and the storage tank 1 and the connection between the second tube 5 and the filling tank 2 using the vacuum assembly. If there is a leak, return to step S1 and reinstall the leaking position. If the seal is good, proceed to step S3.

[0048] S3: Open the first valve 6 to allow the gas in the storage tank 1 to enter the transfer chamber. After the pressure in the transfer chamber stabilizes, close the first valve 6 and observe whether the pressure measuring instrument value changes. If the pressure measuring instrument value remains unchanged, the seal is good, and proceed to step S4. If the pressure measuring instrument value changes, there is a leak, and repeat step S1.

[0049] S4: Open the first valve 6 and the second valve 7, and the gas in the storage tank 1 is filled into the filling tank 2 through the first pipe 4 and the second pipe 5.

[0050] The gas filling method of this disclosure is easy to operate. By performing dual testing on the transfer chamber under negative pressure after vacuuming and under high pressure after being filled with the gas to be filled, the results are reliable. This ensures the sealing of the connection between the first tube 4 and the storage tank 1 and the second tube 5 and the filling tank 2, as well as the stability and safety of the gas filling process, thereby improving the gas filling efficiency.

[0051] In some embodiments, the vacuum assembly includes a third pipe 10, a fifth valve 11, and a vacuum pump 12. The third pipe 10 is connected to the transfer chamber, the fifth valve 11 is located in the third pipe 10, and the vacuum pump 12 is located in the third pipe 10. In step S2, the fifth valve 11 is opened, and the vacuum pump 12 is used to perform vacuuming on the transfer chamber. When the pressure in the transfer chamber reaches a set value, the fifth valve 11 and the vacuum pump 12 are closed, and the pressure measuring instrument value is observed to see if it changes. If the pressure measuring instrument value remains unchanged, the seal is good; if the pressure measuring instrument value changes, there is a leak.

[0052] The transfer chamber is evacuated through the third pipe 10, the fifth valve 11, and the vacuum pump 12. The structure is simple and easy to operate. The fifth valve 11 can be used to seal the third pipe 10 to prevent leakage from the transfer chamber through the third pipe 10 and eliminate the influence of the third pipe 10 on the pressure changes in the transfer chamber.

[0053] In some embodiments, a third valve 8 is provided on the first pipe 4. In step S2, when there is a leak in the transfer chamber under negative pressure, the third valve 8 is closed, and the connection sealing between the second pipe 5 and the filling tank 2 is tested separately. If the pressure measuring instrument value continues to rise, there is a leak at the connection between the second pipe 5 and the filling tank 2. If the pressure measuring instrument value remains unchanged, there is a leak at the connection between the first pipe 4 and the storage tank 1. The operation is convenient and reduces the amount of reinstallation and maintenance work.

[0054] In some embodiments, in step S3, when there is a leak in the transfer chamber under high pressure, the third valve 8 is closed, and the connection sealing between the second pipe 5 and the filling tank 2 is tested separately. If the pressure measuring instrument value continues to drop, there is a leak at the connection between the second pipe 5 and the filling tank 2. If the pressure measuring instrument value remains unchanged, there is a leak at the connection between the first pipe 4 and the storage tank 1. This operation is convenient and reduces the amount of reinstallation and maintenance work.

[0055] In some embodiments, a fourth valve 9 is provided on the second pipe 5. In step S2, when there is a leak in the transfer chamber under negative pressure, the fourth valve 9 is closed, and the sealing of the connection between the first pipe 4 and the storage tank 1 is tested separately. If the pressure measuring instrument value continues to rise, there is a leak at the connection between the first pipe 4 and the storage tank 1. If the pressure measuring instrument value remains unchanged, there is a leak at the connection between the second pipe 5 and the filling tank 2. The operation is convenient and the leak location is easy to locate.

[0056] In some embodiments, in step S3, when there is a leak in the transfer chamber under high pressure, the fourth valve 9 is closed, and the sealing of the connection between the first pipe 4 and the storage tank 1 is tested separately. If the pressure measuring instrument value continues to drop, there is a leak at the connection between the first pipe 4 and the storage tank 1. If the pressure measuring instrument value remains unchanged, there is a leak at the connection between the second pipe 5 and the filling tank 2. The operation is convenient and it is easy to locate the leak.

[0057] In the description of this disclosure, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this disclosure and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0058] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this disclosure, "a plurality of" means at least two, such as two, three, etc., unless otherwise expressly and specifically defined.

[0059] In this disclosure, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0060] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0061] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0062] Although embodiments of the present disclosure have been shown and described above, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present disclosure. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present disclosure.

Claims

1. A gas filling system, comprising: a storage tank, a discharge pipe being connected to the storage tank, a first valve being arranged on the discharge pipe for opening and closing the discharge pipe; a to-be-filled tank, an intake pipe being connected to the to-be-filled tank, a second valve being arranged on the intake pipe for opening and closing the intake pipe; an intermediate tank, a first pipe and a second pipe, the intermediate tank being fixedly arranged between the first pipe and the second pipe, the intermediate tank having a transfer cavity and the transfer cavity being communicated with the first pipe and the second pipe, the other end of the first pipe being detachably connected to the discharge pipe, the other end of the second pipe being detachably connected to the intake pipe; a vacuumizing assembly, the vacuumizing assembly being arranged on the intermediate tank and being used for vacuumizing the transfer cavity; and a pressure measuring instrument, the pressure measuring instrument being arranged on the intermediate tank and being used for monitoring the pressure in the transfer cavity.

2. The gas filling system according to claim 1, wherein the volume of the transfer cavity is 20%-30% of the volume of the to-be-filled tank.

3. The gas filling system according to claim 1 or 2, wherein the first pipe is provided with a third valve, and / or the second pipe is provided with a fourth valve.

4. The gas filling system according to any one of claims 1 to 3, wherein the vacuumizing assembly comprises a third pipe, a fifth valve and a vacuum pump, the third pipe being arranged on the intermediate tank and being communicated with the transfer cavity, the fifth valve being arranged on the third pipe and being used for controlling opening and closing of the third pipe, and the vacuum pump being arranged on the third pipe and being located on the side of the fifth valve away from the intermediate tank.

5. A gas filling method, comprising the gas filling system according to any one of claims 1 to 4, the gas filling method comprising the following steps: S1: installing the intermediate tank, the first pipe and the second pipe at the end of the discharge pipe of the storage tank, and connecting the intake pipe of the to-be-filled tank to the second pipe; S2: detecting the sealing performance of the positions where the first pipe is connected to the storage tank and the second pipe is connected to the to-be-filled tank by the vacuumizing assembly, if there is leakage, returning to step S1 to re-install the position where the leakage occurs, if the sealing performance is good, proceeding to step S3; S3: opening the first valve, so that the gas in the storage tank enters the transfer cavity, after the pressure in the transfer cavity is stable, closing the first valve, and observing whether the value of the pressure measuring instrument changes, if the value of the pressure measuring instrument does not change, the sealing performance is good, proceeding to step S4, if the value of the pressure measuring instrument changes, there is leakage, repeating step S1; S4: opening the first valve and the second valve, and filling the gas in the storage tank into the to-be-filled tank along the first pipe and the second pipe.

6. The gas filling method according to claim 5, wherein the vacuumizing assembly comprises a third pipe, a fifth valve and a vacuum pump, the third pipe being communicated with the transfer cavity, the fifth valve being arranged on the third pipe, and the vacuum pump being arranged on the third pipe, in step S2, the fifth valve is opened, the transfer cavity is vacuumized by the vacuum pump, when the pressure in the transfer cavity reaches a set value, the fifth valve and the vacuum pump are closed, and it is observed whether the value of the pressure measuring instrument changes, if the value of the pressure measuring instrument does not change, the sealing performance is good, if the value of the pressure measuring instrument changes, there is leakage. ​ ​ ​ ​ ​ ​ ​ ​ ​ 7. The gas filling method according to claim 5 or 6, wherein the first pipe is provided with a third valve, and in step S2, when there is a leak, the third valve is closed, if the pressure measuring instrument value continues to change, then there is a leak at the connection position of the second pipe and the to-be-filled tank, and if the pressure measuring instrument value does not change, then there is a leak at the connection position of the first pipe and the storage tank.

8. The gas filling method according to claim 7, wherein in step S3, when there is a leak, the third valve is closed, if the pressure measuring instrument value continues to change, then there is a leak at the connection position of the second pipe and the to-be-filled tank, and if the pressure measuring instrument value does not change, then there is a leak at the connection position of the first pipe and the storage tank.

9. The gas filling method according to any one of claims 5 to 8, wherein the second pipe is provided with a fourth valve, and in step S2, when there is a leak, the fourth valve is closed, if the pressure measuring instrument value continues to change, then there is a leak at the connection position of the first pipe and the storage tank, and if the pressure measuring instrument value does not change, then there is a leak at the connection position of the second pipe and the to-be-filled tank.

10. The gas filling method according to claim 9, wherein in step S3, when there is a leak, the fourth valve is closed, if the pressure measuring instrument value continues to change, then there is a leak at the connection position of the first pipe and the storage tank, and if the pressure measuring instrument value does not change, then there is a leak at the connection position of the second pipe and the to-be-filled tank.

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