通过对转油线内结焦物的组成、结构及烃类热反应行为的分析，提出重芳烃、胶质、沥青康的缩合反应和二烯烃的聚合环化反应是造成转油线结焦的主要原因，认为转油线结焦的初期金属催化生焦起主要作用，以后因油气在器壁上冷凝，造成易生焦组分在高温下长时间的停留，最终转化成焦炭。 Based on the analysis of the composition and structure of the coke in the oil transfer line and the analysis of the thermal reaction behavior of the hydrocarbons, it is proposed that the condensation reaction of heavy aromatics, colloids and asphalt and the polymerization cyclization reaction of diolefins are the main causes , That the early oil coking metal catalytic coke play a major catalytic role in the future because of oil and gas condensation in the wall, resulting in easy coke component at a high temperature for a long time to stay, and eventually converted into coke.