Abstract: In shenhua Baotou PE unit,the exhaust gas to the torch system containing more than 22% of C₂ olefin components. To improve the recovery of ethylene,comonomers and isopentane from the exhaust gas of gas-phase ployethylen plant, choose a suitable recycling schemes for Baotou plant by Compared with existing domestic comprehensive utilization of tail gas recovery scheme(membrance sparation,cryogenic separation,GPE,PSA,ombination technique). Results show that recovered ethylene 81kg/h, 1-butene consumption fell 0.093 t/t to 0.091t/t, isopentaneconsumption fell 1.7kg/t to 1.52kg/t, which greatly reduces the emission of flare gas and the energy consumption,and calculate preliminary economic analysis.

Key words: PE, exhaust gas, recycling

摘要： 针对神华包头气相法聚乙烯装置中排放至火炬系统的尾气含有22%左右的C₂以上烯烃组分无法回收的现状，通过对国内现存的膜分离技术、深冷分离、GPE、PSA以及组合方案的技术路线与经济性比较，选择一种适合包头烯烃厂目前运行状况的回收方案，根据实际排放数据计算烯烃回收利用率，乙烯回收81kg/h，1-丁烯单耗由0.093t/t降至0.091t/t，异戊烷单耗由1.7kg/t降至1.52kg/t，回收乙烯的同时减少排放气的火炬排放，从而降低装置能耗，并对此方案进行初步经济性分析。

关键词: 聚乙烯, 驰放气, 尾气回收