聚乙烯装置驰放气的回收利用

Research for recycling PE exhaust gas

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。

In shenhua Baotou PE unit, the exhaust gas to the torch system containing more than22% of C2 olefin components. To improve the recovery of ethylene, comonomers and isopentanefrom the exhaust gas of gas-phase ployethylen plant, choose a suitable recycling schemes forBaotou plant by Compared with existing domestic comprehensive utilization of tail gas recoveryscheme （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 gasand the energy consumption, and calculate preliminary economic analysis.