通过对某石化公司服役3 a的乙烯裂解炉管沿高度方向的显微组织进行分析, 使用定量金相分析的方法将该炉管沿高度方向的损伤状态与蠕变损伤等级-剩余寿命图进行对比, 获得了不同高度处炉管的剩余寿命。结果表明: 该乙烯裂解炉管蠕变损伤程度沿高度方向的分布是不均匀的, 4~7 m高度处损伤最为严重, 约有50%的剩余寿命; 其他高度处的炉管仍处于蠕变损伤的初级阶段,尚有70%~90%的剩余寿命。

The creep damage states of ethylene cracking tubes which had serviced for three years along longitudinal direction were analyzed with quantitative metallographic analysis method, and the relationship between creep damage levels and remaining life was studied. The damage distribution was obtained along the high level for the tubes. The results show that the creep damage of the tubes was non-uniform. The severest damage occurred at 4~7 m high level of the tubes and where had about 50% remaining life. The creep damage at the other high lever was still in the initial stage and where had 70% ~ 90% remaining life.