Hydrogen cooling system for combined hydrogenation and liquefied natural gas refueling stations

Abstract

A hydrogen cooling system for a combined hydrogen refueling and liquefied natural gas (LNG) refueling station includes a hydrogen refueling system and an LNG refueling system. The liquid phase outlet at the bottom of the LNG storage container of the LNG refueling system is connected to a first LNG delivery pipe and a second LNG delivery pipe, while the gas phase outlet at the top is connected to a BOG (Bottle-Off Gas) delivery pipe. The first LNG delivery pipe is connected to the inlet of the LNG refueling equipment via a pressurization pump. The BOG delivery pipe and the second LNG delivery pipe are connected in parallel to a shared LNG / BOG delivery pipe. One end of the shared LNG / BOG delivery pipe is connected to the cold side inlet of a heat exchanger, and the other end is connected to the first LNG delivery pipe via a first control valve. The cold side outlet of the heat exchanger is connected to a shared LNG / BOG return pipe via a shared LNG / BOG output pipe and a shared BOG vaporizer via a second control valve. The downstream end of the shared LNG / BOG return pipe is connected to the return port at the bottom of the LNG storage container. The BOG vaporizer is connected to the natural gas storage container via a pipeline. The return pipe of the LNG refueling equipment is connected to the shared LNG / BOG return pipe.

Description

Technical Field

[0001] The invention relates to the field of a hydrogenation and liquefied natural gas (LNG) combined station, and in particular to a hydrogen cooling system of a hydrogenation and liquefied natural gas (LNG) combined station. Background Art

[0002] The pressure of the gas source equipment at a hydrogen refueling station is usually 45MPa or above. The hydrogen output by the gas source equipment is filled into the customer's container through the hydrogen refueling equipment at a pressure of 35MPa or above. The hydrogen filling process is a hydrogen compression process. The compression of the gas in the customer's container will generate heat. In order to ensure the safety of filling into the customer's container, the hydrogen needs to be pre-cooled during the hydrogen filling process to ensure that the hydrogen temperature in the customer's container is not greater than 85°C.

[0003] The hydrogen cooling during the filling process of the existing hydrogen refueling station is carried out through a heat exchanger. The heat exchanger is divided into a hot side and a cold side. The hot side is a hydrogen channel, and the upstream end is connected to the hydrogen sequence / program control panel, and the downstream end is connected to the hydrogenation equipment to provide hydrogen for the filling and refueling of the hydrogenation equipment; the cold side is a cooling medium channel, and the upstream and downstream ends are connected to the refrigeration equipment specially set up in the hydrogenation station to make the cooling medium circulate. The hydrogen undergoes heat exchange in the heat exchanger, and after the hydrogen is cooled, it is filled and refilled into the customer's container through the hydrogenation equipment.

[0004] The refrigeration equipment of existing hydrogen refueling stations uses chillers or refrigeration units, which contain compressors, condensers, water pumps, etc., and consume electricity during operation. Depending on the cooling capacity, the power of the unit ranges from more than ten kilowatts to tens of kilowatts, which consumes a lot of electricity and has high operating costs. In addition, the special refrigeration equipment not only occupies a large area, but also increases the construction cost, resulting in relatively large construction investment and operating costs of hydrogen refueling stations, which is not conducive to saving energy and reducing operating costs.

[0005] The liquefied natural gas (LNG) at the LNG filling station is a liquid that is compressed and cooled to its condensation point of -161.5℃. Usually, LNG is stored in a low-temperature storage tank at -162℃ and about 0.1-1.0MPa. However, even if LNG is stored in a low-temperature storage tank, the invasion of heat from the external environment will cause LNG to gasify and produce flash gas (BOG) in the storage tank and during transportation through pipelines. When the pump in the LNG storage tank is running, part of the mechanical energy is converted into heat energy, which will also cause the LNG in the tank to gasify and produce flash gas. These flash gases form natural gas at room temperature. If they are allowed to be discharged into the air, it will not only be dangerous, but will also pollute the atmospheric environment and cause considerable economic losses. Summary of the invention

[0006] The purpose of the present invention is to address the problems existing in the prior art and to propose a hydrogen cooling system for a combined hydrogenation and liquefied natural gas (LNG) station. The system connects the LNG filling system of the combined station with the cold side of a heat exchanger of a hydrogenation system, and utilizes the low temperature of liquefied natural gas (LNG) to perform heat exchange with the added hydrogen. This system can not only meet the needs of cooling the added hydrogen, but also meet the needs of filling the LNG. It can also recycle the flash gas (BOG) generated during the storage and transportation of the LNG. There is no need to set up special hydrogen cooling equipment, which can reduce costs, reduce energy consumption, and is beneficial to environmental protection.

[0007] The object of the present invention is achieved in that:

[0008] A hydrogen cooling system for a hydrogenation and liquefied natural gas (LNG) refueling station, comprising a gas source device of the hydrogenation system, a hydrogen program / sequence control panel, a heat exchanger, and a hydrogenation device, wherein the gas source device, the hydrogen program / sequence control panel, the hydrogen channel on the hot side of the heat exchanger, and the hydrogenation device are sequentially connected through a hydrogen delivery pipe, and further comprising an LNG storage container, an LNG filling device, a BOG gasifier, and a BOG storage or filling device of the liquefied natural gas (LNG) refueling system, wherein the liquid phase outlet at the lower portion of the LNG storage container is connected to a first LNG liquid infusion pipe and a second LNG liquid infusion pipe, the gas phase outlet at the upper portion of the LNG storage container is connected to a BOG gas infusion pipe, the downstream end of the first LNG liquid infusion pipe is connected to an LNG filling device inlet, a booster pump is provided on the first LNG liquid infusion pipe, and the BOG gas infusion pipe and the second LNG liquid infusion pipe are connected in parallel to an LN The LNG / BOG common delivery pipe has one end connected to the inlet end of the cooling medium channel on the cold side of the heat exchanger, and the other end is connected to the first LNG liquid delivery pipe through a first control valve. The outlet end of the cooling medium channel on the cold side of the heat exchanger is connected to one end of the LNG / BOG common output pipe. The downstream ends of the LNG / BOG common output pipe are respectively connected to the LNG / BOG common return pipe through a second control valve, and are connected to a BOG vaporizer through a third control valve. The position of the LNG / BOG common return pipe is lower than the BOG gas delivery pipe. The downstream end of the LNG / BOG common return pipe is connected to the liquid return port at the bottom of the LNG storage container. The BOG vaporizer is connected to the natural gas storage container through a pipeline, and the return pipe of the LNG filling equipment is connected to the LNG / BOG common return pipe.

[0009] The LNG / BOG common return pipe is connected to the BOG gas transmission pipe through a BOG branch pipe, and the BOG branch pipe is provided with a fourth control valve.

[0010] The LNG / BOG common delivery pipe is provided with an input control valve, a BOG gas delivery pipe and a second LNG liquid delivery pipe are connected between the input control valve and the first control valve, the BOG gas delivery pipe and the second LNG liquid delivery pipe are respectively provided with control valves, and the LNG / BOG common output pipe is provided with an output control valve.

[0011] The upstream and downstream ends of the hot side of the heat exchanger, as well as the inlet and outlet ends of the cold side of the heat exchanger are respectively provided with a pressure gauge, a pressure transmitter, a temperature gauge, and a temperature transmitter.

[0012] The upstream and downstream ends of the booster pump are respectively provided with control valves.

[0013] The inlet end and the return end of the LNG filling equipment are respectively provided with control valves, and the upstream end of the hydrogenation equipment is provided with a control valve.

[0014] Control valves are respectively provided at the upstream and downstream ends of the hydrogen program / sequence control disk. A hydrogen delivery bypass passing through the hydrogen program / sequence control disk is provided upstream of the upstream control valve and connected to the downstream of the downstream control valve. A control valve is provided on the hydrogen delivery bypass.

[0015] The BOG gasifier is connected to the natural gas compressor and the pressure regulating skid through pipelines.

[0016] By adopting the above scheme, the gas source equipment of the hydrogenation system of the hydrogenation and liquefied natural gas (LNG) combined station, the hydrogen program / sequence control panel, the hydrogen channel on the hot side of the heat exchanger, and the hydrogenation equipment are connected in sequence through the hydrogen delivery pipe; the liquid phase outlet at the lower part of the LNG storage container of the LNG addition system is connected to the first LNG liquid delivery pipe and the second LNG liquid delivery pipe, the gas phase outlet at the upper part of the LNG storage container is connected to a BOG gas delivery pipe, the downstream end of the first LNG liquid delivery pipe is connected to the inlet of the LNG filling equipment, a booster pump is arranged on the first LNG liquid delivery pipe, the BOG gas delivery pipe and the second LNG liquid delivery pipe are connected in parallel to a LNG / BOG common delivery pipe, one end of the LNG / BOG common delivery pipe is connected to the cooling medium on the cold side of the heat exchanger. The inlet end of the mass channel of the heat exchanger is connected to the first LNG liquid transfer pipe through the first control valve, and the other end is connected to the first LNG liquid transfer pipe through the first control valve. The outlet end of the cooling medium channel on the cold side of the heat exchanger is connected to one end of the LNG / BOG common output pipe. The downstream end of the LNG / BOG common output pipe is connected to the LNG / BOG common return pipe through the second control valve, and is connected to a BOG vaporizer through the third control valve. The position of the LNG / BOG common return pipe is lower than the BOG gas transmission pipe. The downstream end of the LNG / BOG common return pipe is connected to the return port at the bottom of the LNG storage container. The BOG vaporizer is connected to the natural gas storage container through a pipeline, and the return pipe of the LNG filling equipment is connected to the LNG / BOG common return pipe. In this structure, when the LNG filling equipment fills LNG for the LNG user, LNG is transported to the LNG filling equipment through the first LNG liquid transfer pipe, and the LNG / BOG returned from the LNG filling equipment returns to the LNG storage container through the LNG / BOG common return pipe. When hydrogen needs to be refilled, the LNG and / or BOG are output from the second LNG liquid delivery pipe and BOG gas delivery pipe by utilizing the inherent pressure in the LNG storage container, and can be transported to the cold side of the heat exchanger of the hydrogenation system through the LNG / BOG common delivery pipe without relying on power to pre-cool the hydrogen, which can pre-cool the hydrogen to minus 10° to minus 40°, ensuring that the hydrogen temperature of the user's container will not exceed 85°C during the hydrogen user's refilling process. The LNG and BOG of the liquefied natural gas system in the combined station are used as cooling media, and the cold loss of LNG and BOG is reasonably utilized to pre-cool the hydrogen of the hydrogenation system, eliminating the refrigeration equipment of the chiller or refrigeration unit that needs to be specially set up in the existing hydrogenation system and relies on electricity to provide cooling medium for hydrogen pre-cooling, so as to achieve zero energy consumption for hydrogen cooling; the LNG and / or BOG after heat exchange are returned to the LNG storage container from the cold side of the heat exchanger through the LNG / BOG common output pipe and the LNG / BOG common return pipe, or are used for storage or refilling after being formed into natural gas by the BOG vaporizer.In this way, there is no need to use special refrigeration equipment to pre-cool the hydrogen filling, which can not only reduce the cost of purchasing special refrigeration equipment, but also meet the pre-cooling of hydrogen filling without consuming energy, reducing energy consumption costs and greatly reducing operating costs. At the same time, the generated BOG can also be recycled or utilized to avoid BOG discharge into the atmosphere and polluting the environment.

[0017] The LNG / BOG common return pipe is connected to the BOG gas pipe through a BOG branch pipe, and the BOG branch pipe is provided with a fourth control valve. Since the unit volume weight of BOG is lighter than that of LNG, as long as the fourth control valve is opened, the BOG flowing through the LNG / BOG common return pipe can rise from the BOG branch pipe to the BOG gas pipe, enter the cold side of the heat exchanger through the LNG / BOG common delivery pipe, and participate in the pre-cooling of hydrogen, and only the LNG in the LNG / BOG common return pipe returns to the LNG storage container. In this way, the amount of BOG returned to the LNG storage container can be reduced, and excessive BOG returning to the LNG storage container can be prevented, resulting in excessive increase in pressure in the container, which affects the stability of the pressure in the LNG storage container.

[0018] The present invention connects the LNG / BOG common transmission pipe of the LNG adding system in the hydrogenation and LNG adding station to the cold side inlet end of the heat exchanger in the hydrogenation system, and the cold side outlet end of the heat exchanger is connected to the LNG / BOG common reflux pipe and the BOG vaporizer through the LNG / BOG common output pipe. The LNG and / or BOG of the LNG adding system are used as the cooling medium for pre-cooling the hydrogen. There is no need to set up a special hydrogen cooling device, and the hydrogen added to the hydrogenation system can be pre-cooled, which reduces costs and energy consumption. When the hydrogenation system is working, the LNG adding system can work at the same time, and the two do not affect each other. In addition, the generated flash gas (BOG) can also be used for storage or filling after forming natural gas through the BOG vaporizer, which is beneficial to environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a system piping structure diagram of the present invention. DETAILED DESCRIPTION

[0020] See also Figure 1A hydrogen cooling system for a combined hydrogenation and liquefied natural gas station, the combined hydrogenation and liquefied natural gas station includes a hydrogenation system and a liquefied natural gas system. The hydrogenation system includes a gas source device 16, a hydrogen program / sequence control panel 17, a heat exchanger 18, and a hydrogenation device 19. The gas source device 16, the hydrogen program / sequence control panel 17, the hydrogen channel on the hot side of the heat exchanger 18, and the hydrogenation device 19 are sequentially connected through a hydrogen delivery pipe 23. The upstream and downstream ends of the hot side of the heat exchanger 18 are respectively provided with a pressure gauge PI, a pressure transmitter PT, a temperature gauge TI, and a temperature transmitter TT, which are used to detect the hydrogen pressure and hydrogen temperature. A control valve 36 is provided at the upstream end of the hydrogen program / sequence control disk 17, and a control valve 37 is provided at the downstream end. A hydrogen delivery bypass 24 passing through the hydrogen program / sequence control disk 17 is provided upstream of the upstream control valve 36 and is connected to the downstream of the downstream control valve. A control valve 38 is provided on the hydrogen delivery bypass 24. By opening the control valve 38 on the hydrogen delivery bypass 24 and closing the control valve 36 at the upstream end and the control valve 37 at the downstream end of the hydrogen program / sequence control disk 17, hydrogen can be allowed to enter the heat exchanger 18 from the gas source equipment 16 through the hydrogen delivery bypass 24. By closing the control valve 38 on the hydrogen delivery bypass 24 and opening the control valve 36 at the upstream end and the control valve 37 at the downstream end of the hydrogen program / sequence control disk 17, hydrogen can be allowed to enter the heat exchanger 18 from the gas source equipment 16 through the hydrogen program / sequence control disk 17. The upstream end of the hydrogenation equipment 19 is provided with a control valve 39. Once the control valve 39 is closed, hydrogen cannot enter the hydrogenation equipment 19, and the hydrogenation equipment 19 does not work. The liquefied natural gas system includes an LNG storage container 1, an LNG filling equipment 8, a BOG gasifier 9, and a BOG storage container. The liquid phase outlet at the lower part of the LNG storage container 1 is connected to the first LNG liquid infusion pipe 4 and the second LNG liquid infusion pipe 3, and the gas phase outlet at the upper part of the LNG storage container 1 is connected to a BOG gas infusion pipe 2. The downstream end of the first LNG liquid infusion pipe 4 is connected to the inlet of the LNG filling equipment 8. The first LNG liquid infusion pipe 4 is provided with a pressure pump 5. The upstream end of the pressure pump 5 is provided with a control valve 32, and the downstream end is provided with a control valve 33. When the pressure pump 5 is not used, the control valve 32 at the upstream end of the pressure pump 5 and the control valve 33 at the downstream end are closed. When the pressure pump 5 is used to pressurize the LNG, the control valve 32 at the upstream end of the pressure pump 5 and the control valve 33 at the downstream end are opened, so that the LNG is transported after being pressurized by the pressure pump 5. The BOG gas delivery pipe 2 and the second LNG liquid delivery pipe 3 are connected in parallel to a LNG / BOG common delivery pipe 10, one end of which is connected to the inlet end of the cooling medium channel on the cold side of the heat exchanger 18, and the other end is connected to the first LNG liquid delivery pipe 4 through a first control valve 12. The first control valve 12 is used to control the connection and disconnection of the LNG / BOG common delivery pipe 10 and the first LNG liquid delivery pipe 4.The LNG / BOG common delivery pipe 10 is provided with an input control valve 20, and the BOG gas delivery pipe 2 and the second LNG liquid delivery pipe 3 are connected between the input control valve 20 and the first control valve 12. The BOG gas delivery pipe 2 is provided with a control valve 30 for controlling BOG delivery, and the second LNG liquid delivery pipe 3 is provided with a control valve 31 for controlling LNG delivery. The outlet end of the cooling medium channel on the cold side of the heat exchanger 18 is connected to one end of the LNG / BOG common output pipe 11, and the LNG / BOG common output pipe 11 is provided with an output control valve 21. The inlet end and the outlet end of the cold side of the heat exchanger 18 are respectively provided with a pressure gauge PI, a pressure transmitter PT, a temperature gauge TI, and a temperature transmitter TT for detecting the pressure and temperature of the cooling medium. The downstream end of the LNG / BOG common output pipe 11 is connected to the LNG / BOG common return pipe 6 through the second control valve 13, and is connected to a BOG vaporizer 9 through the third control valve 14. The BOG vaporizer 9 is used to heat BOG to form natural gas. The second control valve 13 and the third control valve 14 are used to control the flow direction of the cooling medium after heat exchange in the LNG / BOG common output pipe 11. The position of the LNG / BOG common return pipe is lower than the BOG gas transmission pipe. The downstream end of the LNG / BOG common return pipe 6 is connected to the liquid return port at the bottom of the LNG storage container 1, so that the LNG after heat exchange can return to the LNG storage container 1. The BOG vaporizer 9 is connected to the natural gas storage container 25 through a pipeline to store natural gas for secondary use; and the BOG vaporizer 9 can also be connected to the natural gas compressor and the pressure regulating skid through pipelines, and the natural gas compressor is used to supply natural gas to the natural gas filling user through the gas filling machine, and the pressure regulating skid is used to supply gas to the natural gas user terminal through the natural gas pipeline, thereby avoiding the direct discharge of BOG into the atmosphere, which is beneficial to environmental protection. The return pipe 7 of the LNG filling equipment 8 is connected to the LNG / BOG common return pipe 6. The inlet end of the LNG filling equipment 8 is provided with a control valve 34, and the return end is provided with a control valve 35. The outlet end of the LNG filling equipment 8 is connected to the filling gun through a filling hose, which is used to fill LNG for LNG users.

[0021] The present invention is not limited to the above-mentioned embodiment. The LNG / BOG common return pipe 6 is also connected to the BOG gas pipe 2 through a BOG branch pipe 15, and the BOG branch pipe 15 is provided with a fourth control valve 22. When the fourth control valve 22 is opened, the BOG entering the LNG / BOG common return pipe 6 can rise from the BOG branch pipe 15 to the BOG gas pipe 2 because the unit volume weight is lighter than that of LNG, and enter the cold side of the heat exchanger 18 through the LNG / BOG common delivery pipe 10 to participate in hydrogen pre-cooling, thereby reducing the amount of BOG returned to the LNG storage container 1, preventing excessive BOG from returning to the LNG storage container 1, causing excessive increase in pressure in the container, and affecting the stability of the pressure in the LNG storage container 1. When the fourth control valve 22 is closed, the LNG and BOG entering the LNG / BOG common return pipe 6 return to the LNG storage container 1.

[0022] In the system, the first control valve 12, the second control valve 13, the third control valve 14, the fourth control valve 22, the input control valve 20, the output control valve 21, and the control valves 30, 31, 32, 33, 34, 35, 36, 37, 38, 39 used in other places are all pneumatic valves or electric valves. In this embodiment, pneumatic valves are preferred. Except for the input control valve 20, the output control valve 21, and the control valves 34, 35, 39 which are normally open, the other control valves are all normally closed. These control valves and the pressure gauges PI, the pressure transmitters PT, the temperature gauges TI, and the temperature transmitters TT are all electrically connected to the PLC provided in the system. The control valves are controlled by the PLC to control the flow direction of hydrogen, LNG, and BOG.

[0023] The gas source equipment 16 in the system can be a hydrogen unloading column, a hydrogen compressor, or a hydrogen storage container.

[0024] The hydrogen cooling system of the combined hydrogenation and liquefied natural gas refueling station can first open the control valve 30 and the third control valve 14 on the BOG gas transmission pipe 2 when hydrogen is added to hydrogen users through the hydrogen transmission bypass 24 of the hydrogenation system or the hydrogen program / sequence control panel 17 via the hot side of the heat exchanger 18 and the hydrogenation equipment 19, and provide BOG as a cooling medium from the LNG / BOG common transmission pipe 10 to the cold side of the heat exchanger 18 to cool the hydrogen. The BOG after heat exchange flows from the third control valve 14 to the BOG vaporizer 9, and after being heated by the BOG vaporizer 9 to form natural gas, enters the natural gas storage container 25 for storage for secondary utilization, or the natural gas is supplied to the natural gas refueling user through the natural gas compressor, or the natural gas is supplied to the natural gas use terminal through the natural gas pipeline through the pressure regulating skid. When it is detected that the temperature at the downstream end of the hot side of the heat exchanger 18 does not reach the hydrogen precooling temperature, the control valve 31 on the second LNG liquid delivery pipe 3 is opened, and LNG is provided from the LNG / BOG common delivery pipe 10 to the cold side of the heat exchanger 18 as a cooling medium to cool the hydrogen, and the temperature at the outlet end of the cold side of the heat exchanger 18 is detected. When it is detected that the temperature is not higher than the maximum working pressure saturation temperature of the LNG storage container 1, the second control valve 13 is opened and the third control valve 14 is closed, so that the LNG after heat exchange is returned to the LNG storage container 1 from the LNG / BOG common output pipe 11 through the LNG / BOG common return pipe 6; when it is detected that the temperature is higher than the maximum working pressure saturation temperature of the LNG storage container 1, the third control valve 14 is opened and the second control valve 13 is closed, so that the LNG after heat exchange is heated from the LNG / BOG common output pipe 11 through the BOG vaporizer 9 to form natural gas, and then enters the natural gas storage container 25 for storage, or supplies natural gas to natural gas users through a natural gas compressor, or supplies gas to natural gas use terminals through a natural gas pipeline through a pressure regulating skid. When LNG is added to LNG users through the LNG filling system, when the pressure of the LNG storage container 1 meets the filling pressure, the control valve 31 on the second LNG infusion pipe 3 and the first control valve 12 on the LNG / BOG common delivery pipe 10 are opened, so that the LNG in the LNG storage container 1 enters the LNG filling equipment 8 from the second LNG infusion pipe 3 through the first control valve 12 and the first LNG infusion pipe 4 to fill LNG for the LNG user. When the pressure of the LNG storage container 1 cannot meet the filling pressure, the first control valve 12 is closed, the control valve 32 at the upstream end and the control valve 33 at the downstream end of the booster pump 5 on the first LNG infusion pipe 4 are opened, and the booster pump 5 is started to deliver LNG to the LNG filling equipment 8. After the LNG user completes the filling, the residual LNG in the LNG filling equipment 8 returns to the LNG storage container 1 from the return pipe 7 through the LNG / BOG common return pipe 6. Under the control of the PLC, the hydrogenation system and the LNG filling system of the hydrogenation and LNG filling station can work simultaneously, serving hydrogen users, LNG users and natural gas users respectively.

Claims

1. A hydrogen cooling system for a combined hydrogenation and liquefied natural gas station, comprising a gas source device of a hydrogenation system, a hydrogen program / sequence control panel, a heat exchanger, and a hydrogenation device, wherein the gas source device, the hydrogen program / sequence control panel, the hydrogen channel on the hot side of the heat exchanger, and the hydrogenation device are sequentially connected through a hydrogen delivery pipe, characterized in that: The invention also includes an LNG storage container, an LNG filling equipment, a BOG vaporizer, and a BOG storage or filling equipment of a liquefied natural gas system. The liquid phase outlet at the lower portion of the LNG storage container is connected to a first LNG liquid infusion pipe and a second LNG liquid infusion pipe, and the gas phase outlet at the upper portion of the LNG storage container is connected to a BOG gas pipeline. The downstream end of the first LNG liquid infusion pipe is connected to the inlet of the LNG filling equipment. A booster pump is arranged on the first LNG liquid infusion pipe. The BOG gas pipeline and the second LNG liquid infusion pipe are connected in parallel to an LNG / BOG common delivery pipe. One end of the LNG / BOG common delivery pipe is connected to the inlet end of the cooling medium channel on the cold side of the heat exchanger, and the other end is connected to the inlet end of the cooling medium channel on the cold side of the heat exchanger. The first control valve is connected to the first LNG liquid delivery pipe, the outlet end of the cooling medium channel on the cold side of the heat exchanger is connected to one end of the LNG / BOG common output pipe, the downstream end of the LNG / BOG common output pipe is connected to the LNG / BOG common return pipe through the second control valve, and is connected to a BOG vaporizer through the third control valve. The position of the LNG / BOG common return pipe is lower than the BOG gas delivery pipe, the downstream end of the LNG / BOG common return pipe is connected to the liquid return port at the bottom of the LNG storage container, the BOG vaporizer is connected to the natural gas storage container through a pipeline, and the return pipe of the LNG filling equipment is connected to the LNG / BOG common return pipe.

2. The hydrogen cooling system of the combined hydrogenation and liquefied natural gas addition station according to claim 1 is characterized in that: The LNG / BOG common return pipe is connected to the BOG gas transmission pipe through a BOG branch pipe, and the BOG branch pipe is provided with a fourth control valve.

3. The hydrogen cooling system of the combined hydrogenation and liquefied natural gas addition station according to claim 1 is characterized in that: The LNG / BOG common delivery pipe is provided with an input control valve, a BOG gas delivery pipe and a second LNG liquid delivery pipe are connected between the input control valve and the first control valve, the BOG gas delivery pipe and the second LNG liquid delivery pipe are respectively provided with control valves, and the LNG / BOG common output pipe is provided with an output control valve.

4. The hydrogen cooling system of the combined hydrogenation and liquefied natural gas addition station according to claim 1 is characterized in that: The upstream and downstream ends of the hot side of the heat exchanger, as well as the inlet and outlet ends of the cold side of the heat exchanger are respectively provided with a pressure gauge, a pressure transmitter, a temperature gauge, and a temperature transmitter.

5. The hydrogen cooling system of the combined hydrogenation and liquefied natural gas addition station according to claim 1 is characterized in that: The upstream and downstream ends of the booster pump are respectively provided with control valves.

6. The hydrogen cooling system of the combined hydrogenation and liquefied natural gas addition station according to claim 1 is characterized in that: The inlet end and the return end of the LNG filling equipment are respectively provided with control valves, and the upstream end of the hydrogenation equipment is provided with a control valve.

7. The hydrogen cooling system of the combined hydrogenation and liquefied natural gas addition station according to claim 1 is characterized in that: Control valves are respectively provided at the upstream and downstream ends of the hydrogen program / sequence control disk. A hydrogen delivery bypass passing through the hydrogen program / sequence control disk is provided upstream of the upstream control valve and connected to the downstream of the downstream control valve. A control valve is provided on the hydrogen delivery bypass.

8. The hydrogen cooling system of the combined hydrogenation and liquefied natural gas addition station according to claim 1 is characterized by: The BOG gasifier is connected to the natural gas compressor and the pressure regulating skid through pipelines.

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