Low-investment liquefied natural gas (LNG) automobile gas station with ultra-small liquefaction system in same position
A natural gas and gas filling station technology, applied in the field of low-investment liquefied natural gas vehicle filling stations, can solve the problems of increasing investment and operating costs, increasing pretreatment equipment, etc.
Inactive Publication Date: 2016-11-23
沈慧贤
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This requires additional pretreatment equipment to remove the above components, increasing investment and operating costs
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[0017] Such as figure 1 As shown, the realization of a preferred mode of the present invention is constituted as follows. The raw gas 10 from the urban low-pressure natural gas pipeline network is sent to the natural gas raw gas precooling unit 100 through the pipeline 12 . The second-stage evaporator 110 of the two-stage cascade refrigerator 200 is provided in the pre-cooling unit 100 . The cascade refrigerator 200 operates at 193K. The second-stage refrigerant of the cascade refrigerator 200 flows into the second-stage evaporator 110 of the two-stage cascade refrigerator 200 through the conduit 20, the throttle valve 21 and the conduit 22 , return to the second-stage compressor of the cascade refrigerator 200 through the conduit 24 after evaporating throttling. The raw material gas is cooled at the outer surface of the copper tube or the fin plate of the second-stage evaporator 110, then flows out of the precooling unit 100 through the conduits 14 and 31, and enters the na...
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The invention discloses a low-investment liquefied natural gas (LNG) automobile gas station with low operation cost. The low-investment LNG automobile gas station is provided with the ultra-small natural gas liquefaction system with the simplest and most effective liquefaction process. The low-investment LNG automobile gas station is especially suitable for rapidly constructing an LNG automobile gas station network, so that an LNG highway network is achieved. According to the technological process system, a precooling unit is involved, natural gas which directly comes from an urban natural gas pipeline network is pre-cooled, and then the pre-cooled natural gas is delivered into a liquefaction unit with the cooling capacity provided by a Stirling cycle low-temperature refrigerator, so that LNG is produced and supplied to LNG automobiles. When the fuel requirement of the LNG automobiles is rapidly increased, only a large-volume storage tank is additionally arranged to receive externally provided LNG. The natural gas liquefaction system continues to operate to be used as a re-liquefaction facility for boil off gas (BOG) of the gas station, so that resources are saved and emission of greenhouse-effect gas is reduced.
Description
technical field [0001] The invention relates to establishing a low-investment liquefied natural gas vehicle filling station with an ultra-small liquefaction system at the same location. This liquefied natural gas vehicle refueling station is especially suitable for quickly constructing a public liquefied natural gas vehicle refueling station network along the expressway, so that the liquefied natural gas vehicle can travel freely along the expressway from the starting point to the end point. Background technique [0002] At present, the source of LNG for liquefied natural gas (LNG) vehicle filling stations comes from a large-scale natural gas liquefaction plant and is transported by LNG tanker. The storage tank of a liquefied natural gas tank car with a volume of 56 cubic meters is vacuum insulated. However, due to heat leakage, an average of 260 cubic meters of natural gas is evaporated every day, which causes the pressure in the tank car to increase. When the pressure in ...
Claims
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IPC IPC(8): F17C5/02F17C13/00
Inventor 沈慧贤
Owner 沈慧贤