A gas filling method and a gas filling device of an LNG gas filling station

Abstract

The invention relates to the field of air entrapping of LNG (Liquefied Natural Gas) stations, particularly relates to an air entrapping method and an air entrapping device of an LNG station. The air entrapping method is applied to the LNG air entrapping device which at least comprises a liquid storage tank and an immersed pump. The air entrapping method comprises the following steps: obtaining actual flow of the LNG output by an outlet of the immersed pump, comparing the actual flow with the maximum flow threshold value and the minimum flow threshold value, if the actual flow is greater than or equal to the maximum flow threshold value, reducing the rotating speed of the immersed pump, and if the actual flow is less than or equal to the minimum flow threshold value, increasing the rotating speed of the immersed pump. The air entrapping method and the air entrapping device of the LNG station are capable of intelligently entrapping air without manual control, avoiding the fault caused by manpower, and furthermore avoiding the problem that low air entrapping efficiency or immersed pump cavitation caused by imprecise control.

Description

technical field [0001] The invention relates to the field of gas filling of LNG gas filling stations, in particular to a gas filling method and a gas filling device of an LNG gas filling station. Background technique [0002] At present, with the continuous development of science and technology and the continuous improvement of people's living standards, automobiles have become the most commonly used means of transportation for people's daily travel. As the most commonly used energy source for automobiles, gasoline produces hydrocarbons, nitrogen oxides, carbon monoxide, sulfur dioxide, lead-containing compounds, benzopyrene, and solid particles when burned, which can pollute the environment. As a result, gasoline-burning cars have become an important source of urban pollution. In comparison, LNG (Liquefied Natural Gas, natural gas), as a clean energy, only produces carbon dioxide and water when it is burned, and has no pollution to the environment. Therefore, in order to r...

AI Technical Summary

Problems solved by technology

[0005] 1. The refilling operator is required to have a particularly detailed understanding of the refilling process, and the refilling operator is required to have relatively rich experience. It is not easy to train a skilled operator, and even a skilled operator may have operational errors Phenomenon;

[0006] 2. Inaccurate manual control can easily lead to too high or too low gas filling pressure. Although there are few problems that cannot be filled due to too low pressure, it is easy to cause slow gas filling efficiency, or cause LNG Submersible pump cavitation

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