An experimental device for testing the non-equilibrium gas-liquid two-phase pipeline flow of liquefied natural gas

Abstract

The invention provides an experimental device for testing non-equilibrium gas-liquid two-phase pipeline flow of liquefied natural gas. The device is composed of a high pressure nitrogen gas cylinder,a liquefied natural gas storage tank, a flow meter, a liquid nitrogen container, a valve, a thermometer, a pressure gage, an experimental testing pipeline, a pressure regulating reaction container, aconstant pressure pump, a liquefied natural gas vaporizer, a condenser, a low temperature pump, an electric heating device, a vacuum dewar and a vacuum pump. Pressures in a test pipeline and the pressure regulating reaction container are controlled by changing the opening of a pressure reducing valve and the rotating speed of the constant pressure pump, and temperatures of the experimental test pipeline and the pressure regulating reaction container are controlled by changing the power of the electric heating device and the liquid nitrogen injection rate, so that gas-liquid phase change and gas-liquid two phase flow of a liquefied natural gas conveying pipeline and an external environment in a large temperature difference condition are tested. The experimental device provided by the invention overcomes the defect that an existing device cannot test the gas-liquid phase change rate and gas-liquid two phase flow of low temperature LNG in a pipeline flowing process and has the function ofcyclically using the liquefied natural gas, so that the experimental cost is lowered.

Description

technical field [0001] The invention relates to an experimental device for testing the non-equilibrium gas-liquid two-phase pipeline flow of liquefied natural gas, and relates to the fields of storage, transportation and pipeline transportation of liquefied natural gas. Background technique [0002] Liquefied Natural Gas (LNG) is a liquid mixture formed by cooling natural gas to -162°C under normal pressure. The main components include methane and a small amount of light hydrocarbon components such as ethane and propane. Pipelines play a very important role in the processing and transportation of LNG. In order to ensure that LNG is in a liquid state in the pipeline, the temperature in the pipeline is maintained below -162°C, and the ambient temperature around the pipeline is generally atmospheric temperature, so the difference between the LNG delivery temperature and the ambient temperature can be as high as 170°C or more . Under such special conditions of large temperatur...

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Problems solved by technology

However, at present, the experimental tests for the non-equilibrium gas-liquid phase transition of oil and gas media are mainly carried out in reactors, and the experimental media are mainly normal temperature liquids such as crude oil and natural gas; such experimental devices cannot simulate the transportation of low-temperature LNG. The flow state in the pipeline cannot simulate and control the large temperature difference between the LNG pipeline and the environment, so it is difficult to obtain the experimental parameters needed to study the non-equilibrium gas-liquid phase transition parameters of LNG and the gas-liquid two-phase pipeline flow

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