Abstract: In order to ensure the intrinsic safety of chemical processes and the timeliness of complex accident handling, appropriate risk assessment methods should be selected. A risk assessment method combining F&EI, HAZOP, and AHP was proposed. F&EI analysis provides a data basis for the preliminary analysis of HAZOP and determines the intrinsic safety of each unit, so that HAZOP analysis only analyzes units that do not meet the safety essence; conducting quantitative AHP analysis on its high-risk evaluation units improves the primary and secondary accuracy of the analysis results. Finally, taking the explosion accident of crude nitrobenzene in a certain factory as an example, the paper demonstrates that the information transmission and sharing among the three methods make the risk assessment process of complex accidents more convenient and efficient, and the risk assessment results are clearer and more reliable.

Key words: chemical process, risk assessment methods, information sharing, risk assessment results