| Summary: | 碩士 === 國立中興大學 === 環境工程學系所 === 99 === Along with the progressing of science and technology industries in Taiwan, a proper management plan of hazardous material, including a variety of toxic chemicals are urgently needed. The objective of this study was to utilize a plume-dispersion model, namely Aerial Locations of Hazardous Atmospheres (ALOHA) to predict the spread of chemical vapors. The data generated by the ALOHA program was used to creat a footprint that was exported and overlaid on geographic information system (GIS) to determine the potential impact of catastrophic chemical releases on nearby communities in central Taiwan. This research aims to simulate the situation following emergent shut-down of security system and the subsequent leak of toxic gas vapors in the Yunlin county. We examined the fitness of current safety devices and potential risk areas and summarized the results from ALOHA simulation as follows:
1.Results indicate that the ERPG-2 for vinyl chloride gas was greater than 10 km, while for chlorine, acrylonitrile, 1,3 - butadiene, benzene, and toluene diisocyanate were estimated to be 1 km. This evidence suggests a potential impact of catastrophic chemical releases on nearby communities in the Yunlin county following accidental leak of vinyl chloride
2.Seasonal variation in weather pattern will affect on the distance of the spread of toxic vapors; the wind direction will also affect on the evacuation path of local residents.
3.Assuming atmospheric conditions, tank volume, storage tank temperature, fracture diameter, and other factors are relatively similar, we estimated that the extent of impact of catastrophic chemical releases on nearby communities follow the rank order: phosgene> chlorine> vinyl chloride> acrylonitrile> allyl alcohol> 1,3 - butadiene> benzene> Epichlorohydrin> dimethyl formamide> Toluene diisocyanate.
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