Method for testing pressure rise rule of LNG (Liquefied Natural Gas) cylinder

Abstract

The invention discloses a method for testing a pressure rise rule of an LNG cylinder. The method comprises the following steps: 1, acquiring operation parameters of the cylinder and giving initial calculation conditions; 2, starting to perform cycle calculation according to known conditions, and calculating liquid specific heat, latent heat of vaporization, gas specific heat and pressure by using temperature; 3, calculating the final temperature of the medium in the gas cylinder by adopting a forward difference method; 4, the final evaporation rate, the gaseous medium mass and the liquid medium mass are determined according to the obtained final temperature of the medium in the gas cylinder; 5, the pressure in the gas cylinder is judged, if the pressure is smaller than the take-off pressure of the safety valve, the second step is executed again to continue circulation calculation, and if the pressure is larger than or equal to the take-off pressure of the safety valve of the gas cylinder, circulation is ended. According to the method, the process of pressure rise caused by heat transfer and LNG evaporation in the LNG cylinder is calculated under the guidance of heat transfer theory, theoretical analysis and the like, and reliable theoretical support is provided for safe storage and transportation of the LNG cylinder.

Description

technical field [0001] The invention relates to the technical field of chemical equipment, in particular to a method for testing the law of boosting pressure of an LNG cylinder. Background technique [0002] With the continuous growth of the economy, the automobile industry has developed vigorously, but it has also brought about problems such as the decrease of petroleum fuels and environmental pollution. As a high-quality clean energy, liquefied natural gas (LNG) has large reserves, low price, and low pollution. It is used as a vehicle fuel due to its low-carbon and environmentally friendly characteristics, so it is considered to be the best alternative fuel for vehicles. LNG-powered vehicles are developing very rapidly. In recent years, more and more buses, freight trucks and construction vehicles use LNG as vehicle fuel to replace traditional gasoline and diesel, effectively reducing the pollution of exhaust emissions to the atmospheric environment. And the continuous co...

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Problems solved by technology

[0005] At present, although domestic and foreign scholars have done a lot of research on the change of thermodynamic parameters in the liquefied medium in the low-temperature storage tank, there is no general calculation method, and the

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