Liquefied natural gas (LNG) drain diffusion and pool fire combustion simulated experimental platform and LNG drain diffusion and pool fire combustion simulated experimental method

Abstract

The invention relates to a liquefied natural gas (LNG) drain diffusion and pool fire combustion simulated experimental platform and an LNG drain diffusion and pool fire combustion simulated experimental method. The platform comprises an experimental system, a testing system and a control system, wherein the experimental system consists of an LNG storage tank, heat-insulation pipes, experimental devices and an anti-explosion isolating wall; the testing system consists of an electronic balance, an ignition system, a methane concentration detector, a thermocouple tree, a data acquirer and a camera; and the control system consists of a programmable logic controller (PLC) system, various display instruments and a control valve. By designing an angle-adjustable LNG surface spreading experimental device with a changeable surface material, spreading and gasification diffusion experimental simulation of LNG on surfaces of different substances and at different flowing speeds can be carried out; and by matching the ignition system and the methane concentration detector, LNG gas cloud concentration change monitoring and gas cloud ignition can be realized, and data and images are acquired automatically. The platform has the advantages of short experimental time, low cost, high experimental efficiency and the like. By the design, experimental steps are less, experimental safety is guaranteed under the condition of severe monitoring and control, the platform is easy and convenient to operate, and experimental repeatability is high.

Description

technical field [0001] The invention relates to the technical field of fire safety, in particular to an LNG leakage diffusion and pool fire combustion simulation experiment platform and an experiment method thereof. Background technique [0002] As an important raw material and product in the petrochemical industry and the energy field, LNG (liquefied natural gas) has been widely used in industry and civil use, and the safe storage and transportation of large-scale LNG is particularly important. LNG may leak during storage and transportation due to safety accidents such as pipeline or valve failures and LNG tanker traffic accidents. Once LNG leaks, it tends to gasify rapidly to form a combustible gas cloud, which may flash or deflagrate under the action of an ignition source; A low-temperature liquid pool is formed inside, and if there is an ignition source and radiant heat, a pool fire can be formed or a large-scale vapor cloud explosion accident can be caused by the po...

AI Technical Summary

Problems solved by technology

However, through small-scale simulation experiments in the laboratory, there is still a lack of relevant and in-depth research on the contents of LNG leakage flow and its phase transition process, LNG diffusion, concentration migration, LNG low-temperature pool fire combustion and rapid evaporation, and the dynamic process of explosion accident evolution. research report

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