KR101069897B1 - Leak test device of high pressure vessel for vehicle and leak test method of high pressure vessel for vehicle - Google Patents

Abstract

The present invention is to provide a device that can prevent a safety accident such as leakage, deformation or explosion of the high-pressure container by pressurizing a certain pressure in the high-pressure container for filling a vehicle fuel filled with compressed natural gas, liquid nitrogen Vaporize to produce nitrogen gas, compress the nitrogen gas to a certain pressure and store it in a storage container, supply the stored nitrogen gas to a high-pressure container for vehicle fuel filling to check the internal pressure, and recover the nitrogen gas used for the inspection An internal pressure inspection and inspection gas recovery apparatus of a high-pressure container for filling a vehicle fuel for inspection, comprising: a liquid nitrogen tank for storing liquid nitrogen; A vaporizer for vaporizing liquefied nitrogen stored in the liquefied nitrogen tank; A compressor receiving the nitrogen gas (N2) vaporized from the vaporizer in a first pressure regulator and supplied through a first opening / closing valve: a first storage container and a second storage container for pressurizing and storing the compressed nitrogen gas in the compressor Wow; A high-pressure container module for internal pressure inspection subject vehicle fuel filling comprising a plurality of high-pressure containers for filling a vehicle fuel in which nitrogen gas stored in the first storage container and the second storage container is supplied and charged at a constant pressure; A second opening / closing valve which is closed when nitrogen gas filling is completed at a predetermined pressure in the vehicle fuel filling high pressure container, thereby preventing further supply of nitrogen gas; A recovery tank connected to the high-pressure container module for charging the vehicle fuel and storing the test gas recovered and provided with a discharge valve; A third opening / closing valve provided between the recovery tank and the high pressure container module for vehicle fuel filling to open the nitrogen gas of the high pressure container for vehicle fuel recovery to the recovery tank; A fourth opening / closing valve having a bypass line for directly supplying the compressor to the recovery tank without recovering nitrogen gas, the fourth opening / closing valve controlling opening and closing of the bypass line; It comprises a second pressure regulator for adjusting the nitrogen gas pressure to the rated pressure of the compressor input side so that the recovered nitrogen gas can be introduced to the compressor side.

Description

PRESSURE DEVICE OF HIGH PRESSURE VESSEL FOR VEHICLE AND LEAK TEST METHOD OF HIGH PRESSURE VESSEL FOR VEHICLE

The present invention relates to the internal pressure inspection of a high-pressure container for filling a vehicle fuel, and more particularly, by pressing a predetermined pressure in the high-pressure container for filling a vehicle fuel filled with compressed natural gas or hydrogen gas, and the high-pressure container withstands the high pressure and By checking for leaks, it is possible to prevent serious accidents such as leakage, deformation or explosion of high pressure containers, and to test the internal pressure of high pressure containers for vehicle fuel filling to recover the test gas and to reuse it again and again. And an inspection gas recovery apparatus and method.

Compressed natural gas (CNG), LPG, hydrogen gas, and the like can be used for vehicle fuels. These gases are compressed and used at high pressure to facilitate storage, transportation, and management.

Among these, CNG, which has methane as its main component, compresses methane gas to 200 bar or more, which is not a petroleum-based fuel unlike gasoline or diesel. It is widely used as a fuel, and has a merit of generating less soot during combustion.

However, CNG has the disadvantage of using a high-pressure container with a risk of explosion, and in recent years, there is also an accident that the CNG container mounted on the bus has exploded, and the fuel-filled pressure vessel used for vehicles including CNG secures its safety. Is needed more than anything.

In order to ensure the safety of the high-pressure container for vehicle fuel filling as described above, inspections such as internal pressure and leakage are very important, but in practice, an efficient internal pressure inspection apparatus and method for the high-pressure container for vehicle fuel filling are not properly provided, and also the internal pressure inspection The efficient recovery device and method are not properly equipped to recover and reuse the gas used in the test after conducting the test, thus neglecting the complete safety inspection of the high-pressure container for vehicle fuel filling, and maintaining the gas used in the test as it is. Emissions cause problems such as gas loss and air pollution.

As a related art, an automatic gas recovery and recharging system of a vehicle LPI tank, which is registered in Korean Patent No. 10-0505743, has been devised. The automatic gas recovery and recharging device 1 of the prior art is recovered to the vehicle LPI tank 2 through the recovery filling pipe 34 and the first, second, third and fourth connecting pipes 6, 7, 8, and 9. The tank 3 and the gas compressor 4 are connected to each other by pipes, and the recovery filling pipe 34 has an opening / closing valve 341 and a first connection part at each connection pipe 6, 7, 8, and 9. 2,3 control valves 61, 71, and 91 are provided, and the control unit 5 changes the flow paths of the control valves 61, 71, and 91, thereby driving the gas compressor 4 to drive the LPG tank 2 ) Gas is recovered by the recovery tank 3 to form a flow path that can be recharged.

The prior art is a technology to prevent the loss of energy and at the same time to prevent the occurrence of safety accidents by preventing the energy loss by refilling the liquid gas to the tank by forcibly recovering all the liquid and gas gas of the LLP tank in the maintenance of the vehicle LPI tank to be. However, the prior art has only the function of controlling the control valve to fill gas into the LP gas tank and completely recover the gas during the maintenance of the LP gas tank, thereby supplying a high pressure to the gas tank to test the internal pressure or inspect the gas leakage state. There is no problem.

The present invention is to solve the above problems, in the inspection of the state by applying a high pressure to the container for vehicle fuel filling, to generate nitrogen gas (N2) with liquid nitrogen (LN2) and to use the internal pressure of the high-pressure container The present invention provides an internal pressure test and test gas recovery apparatus and method for inspecting and evacuating a test gas, and performing a safety test at low cost and environmentally friendly without being accompanied by air pollution.

In order to solve the above problems, the internal pressure inspection and inspection gas recovery apparatus of the high-pressure container for filling a vehicle fuel according to the present invention generates nitrogen gas (N2) by vaporizing liquid nitrogen (LN2) and compresses the nitrogen gas to a constant pressure. And store it in a storage container, supplying the stored nitrogen gas to a high-pressure container for vehicle fuel charging, and inspecting the internal pressure, and recovering the nitrogen gas used for the inspection and storing or bypassing it in the storage container. It should be formed into a structure that can be reused for inspection.

More specifically, the high-pressure vessel internal pressure inspection and inspection gas recovery apparatus for vehicle fuel filling of the present invention includes a liquefied nitrogen tank for storing liquefied nitrogen (LN2); A vaporizer for vaporizing the liquid nitrogen stored in the liquid nitrogen tank; A compressor for reducing the nitrogen gas (N2) vaporized in the vaporizer from the first pressure regulator and supplied through the first opening / closing valve; A first storage container and a second storage container for pressurizing and storing the compressed nitrogen gas in the compressor; A high-pressure container module for internal pressure inspection subject vehicle fuel filling comprising a plurality of high-pressure containers for filling a vehicle fuel in which nitrogen gas stored in the first storage container and the second storage container is supplied and charged at a predetermined pressure; A second opening / closing valve which is closed when nitrogen gas filling is completed at a predetermined pressure in the vehicle fuel filling high-pressure container module to block supply of nitrogen gas any more; A recovery tank connected to the high-pressure container module for vehicle fuel charging, the recovery tank including a recovery pressure gauge for recovering and storing nitrogen gas used for inspection and measuring the pressure of the recovered nitrogen gas; A third opening / closing valve provided between the recovery tank and the high pressure container module for vehicle fuel filling to open the nitrogen gas of the high pressure container for vehicle fuel recovery to the recovery tank side; A fourth line having a bypass line for supplying nitrogen gas to the first storage container and the second storage container by directly supplying the compressor to the compressor without recovering nitrogen gas, and controlling the opening and closing of the bypass line. On-off valve; And a second pressure regulator for adjusting the nitrogen gas pressure to the rated pressure at the compressor input side so that the nitrogen gas recovered at the rear end of the discharge valve and the fourth opening / closing valve can be introduced into the compressor side.

In addition, the internal pressure inspection and inspection gas recovery method of the high-pressure container for vehicle fuel filling of the present invention is a liquid nitrogen storage step (S1) of storing the liquid nitrogen in the liquid nitrogen tank at a pressure of 0.4Mpa, the liquid nitrogen of the S3 step by the vaporizer Vaporization step (S2) to vaporize with nitrogen gas of 1.4MPa pressure which is about 2 times, decompression step of supplying the vaporized nitrogen gas to 0.7Mpa to the compressor (S3), pressurizing the reduced nitrogen gas to 12Mpa in the first storage Supply step (S4) for supplying the container and the second storage container, the nitrogen gas supplied to the first storage container and the second storage container by opening the first opening and closing valve to the high-pressure container module for vehicle fuel filling composed of a plurality of high-pressure container. Filling step (S5) to fill at 7Mpa pressure, when the nitrogen gas is charged to the high-pressure container maintained a pressure of 7Mpa for 1 minute to check the internal pressure of the high-pressure container and gas leakage test (S6), high pressure for vehicle fuel charging Storage in containers Recovery step (S7) for recovering nitrogen gas to the recovery tank, resupply step (S8) for compressing the recovered nitrogen gas in the compressor to store in the first and second storage containers, nitrogen gas remaining in the high-pressure container for vehicle fuel filling Residual gas recovery step (S9) for recovering, the high-pressure container internal pressure inspection and inspection gas recovery device for vehicle fuel filling and stopping step (S10) for replacing with a new vehicle fuel filling high pressure container module.

According to the present invention, after the vaporized liquid liquefied nitrogen is vaporized through a vaporizer, the compressor is compressed and supplied to the first storage container and the second storage container through a compressor, and then the internal pressure of the high-pressure container module for vehicle fuel filling comprising a plurality of high-pressure containers to be inspected. Inspection and gas leakage inspection, and nitrogen gas used for internal pressure and leakage inspection is recovered through the recovery tank and supplied to the first storage container and the second storage container to be recharged to The effect is to inspect the internal pressure and gas leakage easily and precisely.

In other words, it is possible to easily charge high pressure from the newly manufactured high pressure container for vehicle fuel filling and high pressure container for vehicle fuel filling, and to perform internal pressure and leakage inspection. Major accidents such as explosions can be prevented in advance, and inspection gas cost can be reduced by reusing inspection gas. Also, it does not release the inspection gas into the atmosphere, thereby creating a drastic effect of preventing air pollution. Will be.

1 is a view showing a technique for filling and recovering gas in an LNG tank as a prior art;
2 is a view showing the general flow of the high-pressure vessel internal pressure inspection and inspection gas recovery device for vehicle fuel filling of the present invention,
3 is a view showing a specific embodiment of the high-pressure container internal pressure inspection and inspection gas recovery apparatus for vehicle fuel filling of the present invention,
Figure 4 is a process chart showing an embodiment of the internal pressure inspection and test gas recovery method for vehicle fuel filling of the present invention.

Hereinafter, the configuration and operation of the present invention will be described in more detail with reference to the accompanying drawings. In describing the present invention, the term or word used in the present specification and claims is based on the principle that the inventor can appropriately define the concept of the term in order to best describe the invention of his or her own. It should be interpreted as meanings and concepts corresponding to the technical idea of

As shown in FIG. 2, the present invention is a high-pressure vessel internal pressure inspection and inspection gas recovery apparatus for filling a vehicle fuel, which vaporizes liquid nitrogen to generate nitrogen gas, compresses nitrogen gas to a predetermined pressure, and stores the same in a storage container. Supplying nitrogen gas to the high-pressure container for vehicle fuel filling to check the internal pressure, recovering and storing the nitrogen gas used for the inspection, and then supplying it to another high-pressure container for vehicle fuel filling using the recovered gas for reuse. The liquid nitrogen tank 10, the vaporizer 20, the compressor 30, the first storage container 41 and the second storage container 42, the high-pressure container module 50 for vehicle fuel filling, recovery The tank 70 and pressure regulators and valves are connected by a pipeline.

More specifically, the high-pressure vessel internal pressure inspection and inspection gas recovery device for vehicle fuel filling according to the present invention includes a liquefied nitrogen tank 10 for storing liquefied nitrogen, and a liquefaction stored in the liquefied nitrogen tank 10, as shown in FIG. 3. A vaporizer 20 for vaporizing nitrogen, a nitrogen gas vaporized in the vaporizer 20, the compressor 30 to receive the pressure through the pressure regulator 31 and supplied through the first opening and closing valve 61, and in the compressor 30 The first storage container 41 and the second storage container 42 for storing the compressed nitrogen gas, and the nitrogen gas stored in the first storage container 41 and the second storage container 42 is filled and supplied with a plurality of When the vehicle fuel filling container module 50 and the vehicle fuel filling container 51 are filled with nitrogen gas at a constant pressure, the high pressure vessels 51 block the nitrogen gas supply to maintain an internal pressure test state. Inspection after the internal pressure inspection of the two-opening valve 60 and the vehicle fuel filling high pressure container 51 A recovery tank 70 to which a third opening / closing valve 80 for recovering and storing nitrogen gas used in the recovery tank 70 and a recovery pressure gauge 71 for measuring the pressure of the recovered nitrogen gas is added; It comprises a discharge valve 83 for supplying the nitrogen gas of the recovery tank 70 to the compressor 30 side.

In addition, a bypass line capable of filling nitrogen gas into the first storage container 41 and the second storage container 42 by supplying directly to the compressor 30 without recovering and storing nitrogen gas into the recovery tank 70. And a fourth opening / closing valve (81) for controlling the opening and closing of the bypass line.

And at the rear end of the discharge valve 83 and the fourth opening and closing valve 81, the nitrogen gas pressure is adjusted to the rated pressure of the compressor input side so that the nitrogen gas recovered in accordance with the opening of the valves can be introduced into the compressor 30 side. The second pressure regulator 82 is made to include.

3 is a ball valve, a CV is a check valve, a DV is a drain valve, an NV is a needle valve, and an FT filter is shown in the piping diagram of the high-pressure vessel internal pressure inspection and inspection gas recovery device of the present invention shown in FIG. FV indicates flow valve, FC indicates flow control, PT indicates pressure (transmitter), PC indicates pressure regulator, PI indicates pressure gauge, PSV indicates pressure safety valve, PAH indicates high pressure alarm and ATM indicates nitrogen gas exhaust. Functions and functions of the devices are generally known in the piping for communicating the pressure fluid, so detailed descriptions thereof will be omitted.

Next, the high pressure vessel internal pressure inspection and test gas recovery method for filling a vehicle fuel according to the present invention will be described. As shown in Figure 4, the high-pressure container internal pressure inspection method for vehicle fuel filling of the present invention is liquid nitrogen storage step (S1), vaporization step (S2), decompression step (S3), supply step (S4), filling It consists of a step S5, an internal pressure inspection step S6, a recovery step S7, a resupply step S8, a residual gas recovery step S9, and a stop step S10.

The liquefied nitrogen storage step (S1) is a step of storing liquefied nitrogen in the liquefied nitrogen tank 10, and stores the liquefied nitrogen in the liquefied nitrogen tank 10 at a pressure of 0.4 Mpa.

The vaporization step (S2) is a step of vaporizing the liquefied nitrogen stored in the liquefied nitrogen tank 10 in the liquefied nitrogen storage step (S1), vaporizing the liquefied nitrogen with the vaporizer 20 to generate a nitrogen gas having a 1.4Mpa pressure. do.

The depressurization step (S3) is a step of depressurizing the nitrogen gas vaporized in the vaporization step (S2) to the input rated pressure of the compressor (30), and the nitrogen gas vaporized at a pressure of 2 Mpa in the first pressure regulator (31) is 0.7. The pressure was reduced to Mpa and supplied to the compressor 30.

Compressor 30 for supplying nitrogen gas in the depressurization step should be applied to have an optimum rated capacity in order to maximize the operating efficiency of the high pressure vessel internal pressure inspection and inspection gas recovery device for vehicle fuel filling of the present invention, the compressor The rated capacity of 30 is 0.7Mpa at the input side and 12Mpa at the discharge side to maximize the device driving efficiency according to the use of the compressor. For this reason, the present invention requires a decompression step.

The supply step (S4) is a step of compressing the nitrogen gas in the compressor 30 to supply and store the first storage container and the second storage container, the nitrogen gas input to the compressor 30 at a pressure of 0.7Mpa 12Mpa Compressed to be supplied to the first storage container 41 and the second storage container 42 to be stored.

The filling step (S5) is a vehicle fuel charging high-pressure container module 50 consisting of a plurality of high-pressure vessels 51 for charging the vehicle fuel nitrogen gas supplied to the first storage container 41 and the second storage container 42. As a step of supplying and charging), the second opening / closing valve 60 is opened until 12 Mpa of nitrogen gas stored in the first and second high pressure containers reaches a pressure of 7 Mpa in the plurality of vehicle fuel filling high pressure containers 51. When the blue lamp (not shown), which is a signal indicating that the charging is completed, is turned on, the second opening / closing valve 60 is closed.

The pressure test step (S6) is a step of performing a pressure test through a high-pressure nitrogen gas filled in a plurality of high-pressure vessels 51 for vehicle fuel filling, nitrogen gas filled in a high-pressure vessel 51 for vehicle fuel charging Hold at 7Mpa for 1 minute to 3 minutes to check for breakage, deformation or leakage of high pressure vessel.

In the recovery step S7, when the internal pressure inspection step S6 is completed, the third opening / closing valve 80 is opened to a plurality of vehicle fuel filling high pressure containers 51 forming the vehicle fuel filling container module 50. Recovering the nitrogen gas used for the inspection filled with 7Mpa pressure to the recovery tank 70, when the third opening and closing valve 80 is opened, the pressure of the high-pressure container 51 for the vehicle fuel filling and the recovery tank 70 Nitrogen gas moves to the recovery tank 70 according to the difference, and it is filled and stored until the pressure of the recovery tank 70 rises to 2.5 Mpa, and at the same time, the pressure of the recovery pressure gauge 71 installed in the recovery line is 1.7. The fourth opening / closing valve 81 is opened until Mpa is communicated with the bypass line bypassing the recovery tank 70 so that the recovered nitrogen gas is directly supplied to the compressor 30.

The resupplying step (S8) is a step of compressing the recovered nitrogen gas in the compressor 30 to store in the first and second storage containers, when nitrogen gas is recovered through the bypass line and supplied to the compressor 30 input side. In addition, the nitrogen gas recovered by driving the compressor 30 is compressed to 12 Mpa and resupplied to the first storage container 41 and the second storage container 42 to be stored.

In addition, when the pressure of the recovery pressure gauge 71 becomes 1.7 Mpa or less in the resupply step (S8), the fourth opening / closing valve 81 is closed to close the bypass line, and the discharge tank disposed at the outlet of the recovery tank 70 is discharged. Opening the valve 83 and discharging the nitrogen gas stored in the recovery tank 70 and supplying it to the input side of the compressor 30, compressing the nitrogen gas recovered from the compressor 30 back to 12 Mpa to form the first storage container 41 and the first container. 2 Recharge into the storage container 42.

Nitrogen gas supplied to the compressor 30 input side in the resupply step (S8) is to be supplied by adjusting the pressure to 0.7Mpa by the second pressure regulator 82 to fit the compressor input static capacity 0.7Mpa.

However, in order to reduce the recovered nitrogen gas to 0.7 Mpa through the second pressure regulator 82 and to resupply the compressor 30 to the compressor 30, the pressure at the front end thereof is at least 1.7 Mpa due to the mechanical characteristics of the second pressure regulator 82. In addition, 3 Mpa of nitrogen gas remains in the high-pressure container 51 for vehicle fuel filling due to pressure loss generated in a pipeline for recovering nitrogen gas and a flow valve or check valve installed on the pipeline.

 The residual gas recovery step (S9) is a step of recovering nitrogen gas having a pressure of 3 Mpa remaining in the high-pressure container 51 for filling the vehicle fuel, by opening the first opening / closing valve 61 to operate the compressor 30. To supply nitrogen gas of 0.7 Mpa required to pressurize the nitrogen gas pressure to the high pressure vessel 51 for vehicle fuel filling, and simultaneously open the second opening / closing valve 60 to open the nitrogen gas remaining in the high pressure vessel 51 for vehicle fuel filling. Recover gas to 1 Mpa.

The stop step (S10) is a step of stopping the high-pressure container internal pressure inspection and test gas recovery device for vehicle fuel filling of the present invention, and replacing with a new inspection target vehicle fuel filling container module 50, the first storage container ( 41) and when the pressure of the supply pressure controller 84 provided between the second storage container 42 and the vehicle fuel filling container module 50 is 12 Mpa or more, driving of the compressor 30 is stopped and all the valves are closed. Close it. At this time, by replacing the high-pressure container 50 for vehicle fuel charging of the new inspection object it is possible to perform the internal pressure and leakage inspection.

As described above, the present invention can be variously modified, and in the above-described embodiment of the present invention, the gas pressure supplied to the high pressure container to be inspected has been described with the CNG fuel filling high pressure container mainly composed of methane gas. The present invention is not limited to these embodiments, and can be modified and used by those skilled in the art to which the present invention pertains in the claims and the detailed description of the present invention together with the embodiments in which the above embodiments are simply combined with existing known techniques. It is to be understood that the description is naturally included in the technical scope of the present invention.

10: liquid nitrogen tank 20: vaporizer
30 compressor 31 first pressure regulator
41: first storage container 42: second storage container
50: vehicle fuel filling container module 51: vehicle fuel filling high-pressure container
60: second open and close valve 61: first open and close valve
70: recovery tank 71: recovery pressure gauge
80: third open / close valve 81: fourth open / close valve
82: second pressure regulator 83: discharge valve

Claims (3)

In the inspection device of a high-pressure container for vehicle fuel filling,
Vaporize the liquid nitrogen to produce nitrogen gas,
Compresses nitrogen gas to a certain pressure and stores it in a storage container.
Supply the stored nitrogen gas to the high pressure container for vehicle fuel filling to check the internal pressure,
Internal pressure inspection and inspection of the high-pressure container for vehicle fuel filling, characterized in that the structure is formed to recover the nitrogen gas used for the inspection and to store or bypass in the storage vessel and reuse it for the internal pressure inspection of another vehicle fuel filling high-pressure container. Gas recovery device. The method of claim 1,
The internal pressure inspection and inspection gas recovery device of the high-pressure container for filling the vehicle fuel,
Liquefied nitrogen tank for storing liquefied nitrogen;
A vaporizer for vaporizing liquefied nitrogen stored in the liquefied nitrogen tank;
A compressor receiving the nitrogen gas vaporized in the vaporizer from the first pressure regulator and supplied through a first opening / closing valve;
A first storage container and a second storage container for pressurizing and storing the nitrogen gas compressed by the compressor;
A high-pressure container module for internal pressure inspection subject vehicle fuel filling comprising a plurality of high-pressure containers for filling a vehicle fuel in which nitrogen gas stored in the first storage container and the second storage container is supplied and charged at a constant pressure;
A second opening / closing valve which is closed when nitrogen gas filling is completed at a predetermined pressure in the vehicle fuel filling high pressure container, thereby preventing further supply of nitrogen gas;
A recovery tank connected to the high-pressure container module for charging the vehicle fuel and storing the recovered nitrogen gas and having a discharge valve;
A third opening / closing valve provided between the recovery tank and the high pressure container module for vehicle fuel filling to open the nitrogen gas of the high pressure container for vehicle fuel recovery to the recovery tank;
A fourth opening / closing valve having a bypass line for directly supplying the compressor to the recovery tank without recovering nitrogen gas, the fourth opening / closing valve controlling opening and closing of the bypass line;
Internal pressure inspection and inspection gas recovery apparatus of the high-pressure container for vehicle fuel filling, characterized in that it comprises a second pressure regulator for adjusting the nitrogen gas pressure to the rated pressure of the compressor input side so that the recovered nitrogen gas is introduced into the compressor side. . In the inspection method of the high-pressure container for vehicle fuel filling,
A liquid nitrogen storage step (S1) of storing the liquid nitrogen (LN2) in the liquid nitrogen tank at a pressure of 0.4 Mpa;
A vaporization step (S2) of vaporizing the liquefied nitrogen stored in the liquefied nitrogen tank by the vaporizer with nitrogen gas of 1.4 Mpa pressure by a vaporizer;
Decompression step (S3) for supplying to the compressor by reducing the nitrogen gas vaporized by the vaporization step to 0.7Mpa;
Supplying the pressurized nitrogen gas to the 12 Mpa by the depressurizing step to supply it to the first storage container and the second storage container (S4);
The filling step of filling the vehicle fuel charging high-pressure container module consisting of a plurality of high-pressure container for the vehicle fuel charge by opening the first opening and closing valves nitrogen gas supplied to the first storage container and the second storage container by the nitrogen gas supply step. (S5);
When nitrogen gas of a predetermined pressure is charged in the vehicle fuel filling high pressure container by the nitrogen gas filling step, the second opening and closing valve is blocked to maintain a pressure of 7 Mpa for 1 to 3 minutes to test the internal pressure of the vehicle fuel filling high pressure container. Internal pressure test step (S6) and;
When the pressure test step is completed, by opening the third opening and closing valve 80 to recover and store the nitrogen gas stored in a plurality of high-pressure containers for vehicle fuel filling container provided in the vehicle fuel filling container module with a recovery tank and recovered nitrogen A recovery step (S7) of supplying gas to the compressor;
A resupply step (S8) of compressing the nitrogen gas recovered in the recovery step by a compressor and storing the first and second storage containers;
Residual gas recovery step (S9) of opening the first opening and closing valve to supply nitrogen gas of 0.7 Mpa necessary for the operation of the compressor, and simultaneously opening the second opening and closing valve to recover nitrogen gas remaining in the high pressure container for filling the vehicle to 1 Mpa; ;
The internal pressure inspection and inspection of the high pressure vessel for vehicle fuel filling, comprising: a stop step (S10) of stopping the internal pressure inspection and inspection gas recovery device for the vehicle fuel filling and replacing a new vehicle fuel filling vessel module. Gas recovery method.

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