Under-pressure LNG flash experimental method

Abstract

The invention discloses an under-pressure LNG flash experimental method. The experimental method based on an under-pressure LNG flash experimental platform can be used for processes such as LNG pressure adjustment, LNG jet control and LNG liquid bath measurement and can be further used for conducting a research on a liquid bath scale by under-pressure LNG under free jet or hindered jet under the conditions of different jet apertures, different angles, different heights, different jet distances and the like by adjusting the jet apertures of the LNG nozzles, the bracket angles and heights, and the distances of barriers and the like according to the experimental objective. The experimental method disclosed by the invention can be used for realizing experimental remote operation and data automatic acquisition and has the characteristics of being safe and reliable and high in experimental repeatability. In addition, the method is based on an under-pressure LNG flash experimental platform, and an insulating liquid receiving disc is adopted, so that the gasifying loss of the LNG in the process of forming the liquid bath can be reduced, and therefore, the measurement result is relatively accurate.

Description

technical field [0001] The invention belongs to the technical field of pressurized liquid injection, and in particular relates to a pressurized LNG flashing experiment method. Background technique [0002] LNG filling station, due to the high storage pressure of LNG (generally, the working pressure of LNG storage tanks is 1.0MPa), when the valves and pipelines are in failure or accident state, once the LNG storage tank leaks, it will cause the pressurized LNG to leak from the leakage port. When spraying out, an LNG liquid pool will be formed on the ground when it encounters an obstacle. The LNG absorbs the surrounding heat and quickly vaporizes. If it encounters an ignition source, a liquid pool fire or a jet fire accident may occur. [0003] At present, the research on the spread fire of LNG liquid pool mainly focuses on the related characteristics of the spread fire on the known scale of the LNG liquid pool. The scale of the liquid pool is an important parameter to accurat...

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Problems solved by technology

[0002] LNG filling station, due to the high storage pressure of LNG (generally, the working pressure of LNG storage tanks is 1.0MPa), when the valves and pipelines are in failure or accident state, once the LNG storage tank leaks, it will cause the pressurized LNG to leak from the leakage port. When spraying out, an LNG liquid pool will be formed on the ground when it encounters an obstacle, and the LNG absorbs the surrounding heat and quickly vaporizes. If it encounters an ignition source, a liquid pool fire or a jet fire accident may occur

[0003] At present, the research on the spread fire of LNG liquid pool mainly focuses on the related characteristics of the spread fire on the known scale of the LNG liquid pool. The scale of the liquid pool is an important parameter to accurately predict the impact of the spread fire of the LNG liquid pool; There is a lack of in-depth research on whether the LNG under free injection or hindered injection can form a liquid pool, or how large a liquid pool can be formed.

Moreover, there is no experimental method for flashing LNG under pressure in the prior art, which can provide true and credible experimental data for the scale and proportion of the liquid pool formed by the flashing of LNG under pressure

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