Petrochemical enterprises have made an indelible contribution to the global modernization. However, as thehigh risk-level enterprises, once gas leak occurs, it will cause great harm to the surrounding environment andresidents. At present, there still exists some weakness in China’s research on petrochemical hazardous gasleak detection and risk classification is still weak. Based on odour recognition (rotten egg odour) and CFDsimulation technology, this paper conducts analysis of risk levels for the hydrogenation process inpetrochemical processing. The study has found that CFD can be used to simulate the concentration of harmfulgas (H2S) diffusion and characterize the severity of harmful gas leakage; the wind direction of thehydrogenation unit and the installation and arrangement of the equipment have an important impact on theleakage of harmful gases, and then CFD simulation can be used to analyse the risk level. This is of guidingsignificance for the placement of H2S detector.
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