Risk analysis of gaseous SO3 sulfonation reactor system based on HAZOP-LOPA

Based on the analysis of the deficiencies of HAZOP, it is presented that the integration of HAZOP with LOPA can obtain the HAZOP-LOPA evaluation method, which can further reduce the risk level of the sulfonated reaction system. For the analysis of the sulfonation reactor system in the gaseous SO
₃
sulfonation process, in the analysis process, the HAZOP method is first used to identify and analyze the existing accident risk in the system. The deviation analysis shows that the temperature of the sulfonation reactor system is easy to lose control and the conversion efficiency is too low. Furtherly using the layer of protection analysis, considering the high temperature of the reactor system after the unefficient cooling water as the initial event, analysis the failure consequences and calculate the probability of accident consequences, and assess the risk level of the existing protection value. The inherent risks and residual risks determine the risk controlling measures so that the risks can be taken under control. The results show that the HAZOP-LOPA evaluation method can quantify the risk and improve the effect of safety analysis. It is an effective method to improve the accuracy and scientificity of risk assessment results.