Pump-free LNG gas-filling system and liquefied natural gas processing method

Abstract

The invention discloses a pump-free LNG gas-filling system and a liquefied natural gas processing method. The pump-free LNG gas-filling system includes an LNG low-temperature storage tank; an upper gas phase of the LNG low-temperature storage tank is provided with a first pipeline and a second pipeline, a lower liquid phase of the LNG low-temperature storage tank is provided with a third pipeline and a fourth pipeline, the first pipeline is provided with a first valve, the second pipeline is provided with a second valve, the third pipeline is provided with a third valve, and the fourth pipeline is provided with a fourth valve; the second pipeline and the third pipeline are communicated with a liquid discharging port through a liquid discharging pipeline, the liquid discharging port is provided with an eighth valve, and positions, corresponding to the second pipeline and the third pipeline, of the liquid discharging pipeline are respectively provided with a second emergency shut-off valve and a third emergency shut-off valve. The liquefied natural gas processing method is provided. With adopting of technical forms of a liquid adding pipeline, a system gas phase pipeline and system liquid discharging and pressurized pipelines, car filling energy dissipation is reduced to be zero energy dissipation, a low-temperature pump and other devices are not required to be increased, and using cost and maintenance cost of the low-temperature pump and other devices are saved.

Description

technical field [0001] The invention relates to a pumpless LNG filling system and a treatment method for liquefied natural gas. Background technique [0002] In recent years, the global production and trade of LNG (Liquefied Natural Gas: liquefied natural gas) has become increasingly active, and it is becoming a new hotspot in the world's oil and gas industry. In order to ensure the diversification of energy supply and improve the structure of energy consumption, some major energy consuming countries are paying more and more attention to the introduction of LNG. Major international oil companies have also shifted their new profit growth point to LNG business. LNG will become the next global competition after oil. popular energy commodity. At present, LNG is the fastest-growing primary energy source in the world. If LNG can be vigorously developed in China, it can make up for the shortage of oil resources to a large extent, ensure the diversification of energy supply, and gr...

AI Technical Summary

Problems solved by technology

Moreover, the compressor-type or hydraulic-pump-type sub-gas station occupies a large area and is noisy, and its gas dispenser must cooperate with the compressor or hydraulic pump, that is, pressurize the gas storage cylinder through the compressor or hydraulic pump, In order to complete the refueling of automobile cylinders, it has the disadvantages of high mechanical wear, huge power consumption, and huge investment costs, and the LNG refueling system in the prior art cannot completely process the generated flash steam and other gases, wasting a lot of resource

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