Inherent thermal runaway hazard evaluation method of chemical process based on fire and explosion index |
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| Affiliation: | 1. Normandie Université LSPC-Laboratoire de Sécurité des Procédés Chimiques (LSPC), EA4704, INSA/Université Rouen, 685 Avenue de l’université, BP 08, 76801 Saint-Etienne-du-Rouvray, France;2. Laboratory of Industrial Chemistry and Reaction Engineering, Johan Gadolin Process Chemistry Centre, Åbo Akademi University, Biskopsgatan 8, FI-20500 Åbo/Turku, Finland;1. Department of Fire Protection Engineering, China People''s Police University, Langfang, Hebei, 065000, PR China;2. State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing, 100081, PR China;3. Process Safety and Disaster Prevention Laboratory, Department of Safety, Health, and Environmental Engineering, National Yunlin University of Science and Technology, 123, University Rd., Sec. 3, Douliou, Yunlin, Taiwan, 64002, Taiwan;4. Division 2.1 ‘‘Explosion Protection Gases and Dusts’’, Bundesanstalt für Materialforschung und -prüfung (BAM), Unter den Eichen 87, D-12205, Berlin, Germany;1. College of Safety Science and Engineering, Nanjing Tech University, Nanjing, 210009, Jiangsu, China;2. Jiangsu Key Laboratory of Hazardous Chemicals Safety and Control, Nanjing, 211800, Jiangsu, China;3. Center for Process Safety and Industrial Disaster Prevention, School of Engineering, National Yunlin University of Science and Technology, 123, University Rd., Sec. 3, Douliou, 64002, Yunlin, Taiwan, ROC |
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| Abstract: | Thermal runaway hazard assessment provides the basis for comparing the hazard levels of different chemical processes. To make an overall evaluation, hazard of materials and reactions should be considered. However, most existing methods didn't take the both into account simultaneously, which may lead the assessment to a deviation from the actual hazard. Therefore, an integrated approach called Inherent Thermal-runaway Hazard Index (ITHI) was developed in this paper. Similar to Dow Fire and Explosion Index(F&EI) function, thermal runaway hazard of chemical process in ITHI was the product of material factor (MF) and risk index (RI) of reaction. MF was an indicator of material thermal hazards, which can be determined by initial reaction temperature and maximum power density. RI, which was the product of probability and severity, indicated the risk of thermal runaway during the reaction stage. Time to maximum rate under adiabatic conditions and criticality classes of scenario were used to indicate the runaway probability of the chemical process. Adiabatic temperature rise and heat of the desired reaction and secondary reaction were used to determine the severity of runaway reaction. Finally, predefined hazard classification criteria was used to classify and interpret the results obtained by this method. Moreover, the method was validated by case studies. |
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| Keywords: | Thermal runaway hazard assessment Chemical process Fire and explosion index Hazard class |
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