Study On The Consequences And Visualization Of LPG Storage Tank Leakage In Chemical Parks Under Multiple Variables

LPG(Liquefied Petroleum Gas)is an important energy supply substance for chemical production,and LPG in chemical parks is often stored in high-pressure storage tanks,which can easily lead to chain accidents of leakage and explosion in the case of leakage.The study of LPG storage tank leakage and explosion law in chemical parks can provide theoretical reference for the prevention of LPG storage tank accidents,which is of great significance to ensure safe production.In this paper,we construct a 1:1 3D model of the Jinyu Petrochemical plant with FLACS to restore the evolution of the Jinyu Petrochemical leakage and explosion accident and compare the simulated leakage gas cloud distribution and explosion overpressure damage area with the damage results of the actual accident for verification.Based on the validated three-dimensional model of the Jinyu Petrochemical Plant,the effect of variables such as leakage rate,wind speed,and separation distance on the diffusion pattern of leaking gas clouds is studied,and the explosion pattern of gas clouds under each variable is simulated by reading the concentration and location distribution data of diffusing gas clouds at the90 s of leakage.Finally,by combining the injury criterion of LPG inhalation to the human body and the explosion overpressure injury criterion,the LPG diffusion poisoning range and the explosion overpressure damage area of the Jinyu Petrochemical spill and explosion were visualized,respectively,and the comprehensive failure injury consequences were visualized by the principle of "rank priority,same level escalation".Simulation results show that:(1)The effect of leakage rate on the volume of the leaking gas cloud reaches a threshold at 41.7 kg/s,beyond which the volume of the gas cloud is no longer proportional to the leakage rate.In the explosion simulation,the leakage rate is proportional to the explosion flame propagation distance,and the ignition delay time is proportional to the ignition delay time up to 9.8 s.(2)The wind speed has a double influence on the downwind diffusion distance of air cloud masses,and a wind speed greater than 2.4 m/s is conducive to reducing its downwind diffusion distance.Wind speed is inversely proportional to the propagation range of the explosion flame.With the increase in wind speed explosion flame distribution from scattered to concentrated change.The area covered by explosive high pressure tends to increase first and then decrease sharply.(3)The separation distance affects the distribution of the leaking gas cloud,and the shape of the gas cloud changes from rectangular to fan-shaped as the separation distance increases.The separation distance is conducive to reducing the area covered by explosive high temperatures but will increase the area covered by explosive sub-high temperatures.At the height of z = 30 m,the diameter of the fireball increases first and then decreases with the increase of separation distance.