Chemical process simulation software Aspen Plus was used to build a coke oven gas conversion section model,and the influence of feed flow deviation of oxygen,coke oven gas,carbon dioxide and water vapor on the heat load and temperature of the reformer was analyzed by hazard and operational analysis(HAZOP).Combined with the process safety index,the safety threshold of operation parameters was obtained,and the quantitative analysis of HAZOP deviation was realized.It can be seen from the simulation results that the feed temperature is not the main factor causing the sharp rise of the reformer temperature,but too low feed temperature of the replenishment stream will inhibit the conversion reaction.The excessive flow of coke oven gas and oxygen is the key factor leading to the increase of heat load and temperature in the reformer section.Since the deviation is caused by the abnormal working condition of the equipment,the equipment in the key position and controlling the key parameters has a great influence on the thermal load and temperature change of the system.