Numerical simulation of factors influencing the diffusion of LPG vapor cloud leakage in a chemical park
Liquefied petroleum gas(LPG)leakage and diffusion are affected by many factors,but the sensitivity of different factors to LPG leakage and dispersion is not clear.The study focused on LPG gas clouds composed of multiple ratios of propane/butane,and applied FLACS software to simulate the effects of four factors:gas cloud composition,leakage conditions,obstacles,and environmental factors on the leakage and diffusion characteristics of LPG vapor clouds in a chemical park.The results show that the higher the proportion of propane in the LPG mixture composed of propane and butane,the higher the explosion limit,and the mixture leakage will cause a greater potential risk of accidents in the chem-ical park;Q9max is linearly related to the leakage rate,and when the leakage rate increases from 24 kg/s to 48 kg/s,the difference in Q9max between the two is 94 795 m3,with an increase of 113.59%;Q9max increases with the increase of the number of leakage sources,and in the three-source leakage scenario,the optimal emergency response time for the leakage accident is within 3.3 min;When Q9max increases by 368.9%,which is 4.68 times that of no obstacles,and is much larger than that of the non-obstruc-ted state;the atmospheric stability has less influence on Q9max,but ambient wind speed and ambient temperature have a larger effect:Q9max decreases with the increase of ambient wind speed and increases with the increase of ambient temperature.The four categories of factors are,in descending order of sen-sitivity,obstacle>leakage conditions>environmental conditions>gas cloud composition.The simula-tion results are of guiding significance for the prevention of risky accidents in the park.
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