Liquefied natural gas (LNG) filling station and gas filling method of LNG

Abstract

The invention discloses a gas filling method of a liquefied natural gas (LNG). The method can be used for filling for various vehicles at normal pressure or lower pressure, reducing environment pollution and saving resources. In the method, gas-liquid separation is performed on a gas-state natural gas mixed in the LNG during delivery of the LNG in a storage system to a filling metering device; the purified LNG is delivered to the filling metering device; the separated gas-state natural gas is transformed to a liquid-state natural gas through liquefaction; and the liquid-state natural gas is returned to the storage system. The invention also discloses an LNG filling station built based on the filling method. The LNG filling station has the advantages of low emission loss, short pre-cooling time of initial starting, high gas filling precision and efficiency, long lossless storage time and the like, thereby promoting the promotion and the application of an LNG automobile.

Description

technical field [0001] The invention relates to a liquefied natural gas filling station, in particular to a liquefied natural gas filling station for filling various vehicles with liquefied natural gas. Background technique [0002] As a clean energy source, Liquefied Natural Gas (Liquefied Natural Gas, usually abbreviated as LNG) is one of the ideal alternative fuels for automobiles. At present, the application of LNG in buses and heavy vehicles has achieved very significant economic and social benefits. LNG is a low-temperature liquid formed by cooling natural gas to the dew point temperature after purification, which is convenient for storage and transportation. LNG is used as vehicle fuel and stored in low-temperature storage tanks at gas filling stations, which can be refueled at any time for vehicles that need to be refueled. [0003] At present, fixed LNG vehicle filling stations, LNG-CNG skid-mounted vehicle filling devices and multi-functional LNG filling stations...

AI Technical Summary

Problems solved by technology

[0005] The above-mentioned fixed LNG vehicle refueling stations have problems such as large area occupation, high cost, high refueling pressure, slow refueling speed, short non-destructive storage time, and large discharge loss.

Although the LNG skid-mounted vehicle gas filling station can be easily relocated as a whole, and has the advantages of high LNG storage efficiency, less land occupation, and small investment, the skid-mounted vehicle gas filling station is subject to cryogenic pump cavitation, real-time monitoring of sealing, and residual Restricted by key technologies such as gas evacuation and pre-cooling control, high-pressure gas filling is generally used, which has disadvantages such as large discharge loss, long initial start-up pre-cooling time, low gas filling accuracy and efficiency, and short non-destructive storage time, which affects LNG vehicles. Promoted application of

Images