Application research based on optimization of key parameters in heavy gas dispersion model
Leakage accidents from storage tanks with dangerous chemicals may cause catastrophic consequences.For the purpose of improving the predicted accuracy of heavy gas dispersion during release incidents,the dispersion coefficients were improved in SLAB to obtain the SLAB-D model.Then SLAB-MD model was developed by integrating the optimization algorithms of dispersion coefficients based on the SLAB-M.The Jack Rabbit Ⅱ(Trials 1,7,and 9)liquid chlorine leakage experiments were employed as the dataset to evaluate and validate models'performance.The outcomes revealed that the four models'performances were ranked as SLAB-MD＞SLAB-D＞SLAB-M＞SLAB,and the statistical performance measurements(SPMs)of the SLAB-MD model were close to the ideal values,among which the mean relative bias(MRB),geometric mean(MG),mean relative square error(MRSE),geometric variance(VG),and factor of 2(FAC2)were 0.27,1.34,0.18,1.24,and 0.93,respectively,which proved that SLAB-MD was excellent in accurately predicting the dispersion of heavy gas leaks.Finally,the model was used to analyze three typical heavy gas leakage and dispersion accidents at domestic and international,which obtained key information such as heavy gas concentration distribution and three-dimensional concentration surface.Additionally,the range of potential casualties was predicted based on the protective action criteria values(PACs).The potential impact zones at the downwind distance,including fatalities,serious injuries,and minor injuries,were 0.15,1.75,and 7.6 km2,0.22,1.98,and 7.03 km2,and 0.12x10-3,0.29× 10-3,and 0.88× 10-3 km2 in the context of liquid chlorine continuous release,liquid chlorine instantaneous leakage,and vinyl chloride continuous discharge,respectively.At sensitive points,the longest escape time was 28 min for liquid chlorine continuous leakage accident,and aftereffect time was 40 min for vinyl chloride continuous release accident.In summary,these predictions provide critical information and effective technical guidance that can be used for emergency response planning and management involving hazardous chemical material spills.
air pollutionheavy gas dispersionmeteorological parametersmodel optimizationdynamic simulation
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