介绍了四川石化公司乙烯装置裂解气压缩机二、三、四段的段间换热器堵塞问题，分析了问题产生的原因，最终提出在换热器入口分支管线增加洗油，促进阻垢剂对垢物进行分散，解决了换热器压差持续升高的问题，为乙烯行业解决同类问题提供了新的思路。

This paper introduces the blockage problems often happened at heat-exchanger between the second,third and fourth sections of the cracking gas compressor in the ethylene plant of PetroChina Sichuan Petrochemical Co.,Ltd.The reasons causing blockage are analyzed.A new solution against the blockage problem is proposed that wash oil is added into the branch pipeline at the inlet of heat-exchanger to promote the dispersion of scale by inhibitor,which can finally solve the problem that the differential pressure of heat exchangers goes up continuously and provide a new idea for the ethylene producers to solve the similar problems.