Study On Leakage And Diffusion Model Of Liquefied Gas Tank And Its Application

Liquefied gas leakage and dispersion will lead to fire explosion and poisoning accidents etc.which will cause casualties and property losses Establishing liquefied gas leakage and diffusion model which can accurately predict its concentration on downwind ground and divide the concentration area of explosions and poison is very important for reducing casualties and property losses.This paper analyzes the influence for liquefied gas leakage and dispersion by atmospheric environment, surface environment and the form of leakage. The result shows that the form of leakage will largely affect diffusion model, and environmental parameters such as atmospheric wind speed, wind direction, atmospheric stability, surface roughness will affect its concentration and distribution area after leaking.According to the analysis and comparison for existing diffusion models and the summary of different leakage form,this paper establishes models for the dispersion of liquefied gas that continuously release from little holes on the phase and liquid space of the liquefied gas tank and instantaneous release of the liquefied gas tank.Through the practical and theoretical analysis, we find that most of the liquefied gas leakage and diffusion is the instantaneous release dispersion of heavy gas.So I study box model which is used to describe the diffusion for the instantaneous leakage of liquefied gas.Through comparing and analysing the experimental results with simulation results that simulated by MATLAB,we clear that the initial ratio between R and h is 1:1,and establishe the general mathematical model of side entrainment coefficients a1.So the accuracy of predicting concentration of the model is improved.This paper simulates and analyzes two typical accidents of liquefied gas leakage according to revised box model and the models of diffusion for liquefied gas leakage. Divide the concentration area of explosions and poison on downwind ground and know the leakage concentration of key location. These can provide scientific basis and reference for safety assessment and preparation of emergency response plan.Figure [28] table [56] reference [54]...