Safety distance analysis of dimethylether filling stations using a modified individual risk assessment method |
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Authors: | Young-Hun Kim Won So Dongil Shin En Sup Yoon |
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Affiliation: | 1.School of Chemical and Biological Engineering,Seoul National University,Seoul,Korea;2.Automation and Systems Research Institute,Seoul National University,Seoul,Korea;3.Department of Chemical Engineering,Myongji University,Gyeonggi-do,Korea |
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Abstract: | The physical properties of dimethylether (DME) are similar to conventional fuels such as LPG and diesel, so DME has been recently
considered one of the most promising candidates for a substitute for them. Equipment failures in gas stations lead to accidents
that pose significant threats to people and property. Therefore, prior to commercialization, safety standards for DME need
to be developed based on risk analysis. In this study, we focused on safety distance in DME filling stations. A hypothetical
DME filling station was modeled based on a DME-LPG mixed filling station designed by KOGAS, and safety distances were suggested
from a semi-quantitative risk estimation approach using individual risk calculations. Modified individual risk calculations
were performed with consequence analysis and failure mode under varying accident scenarios. Compared with existing individual
risk analysis, the modified-individual risk approach is supplemented with a weighting factor to graduate each accident scenario
by historical analysis. Subsequently, the outcome shows the individual risk that suggests a safety distance. To compare with
conventional fuel, we also performed a comparative study on the filling station fuels LPG and DME. According to the quantitative
risk estimation results, we propose a separation distance based on accident scenarios for each facility. In conclusion, safe
distances for DME facilities are lower than those that dispense LPG. Therefore, a DME filling unit can be placed at conventional
gas stations without increasing the safety distance. The results will also be useful in determining the standard for safety
management of renewable and sustainable energy. |
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Keywords: | |
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