１前言 我厂４８万ｔ乙烯改扩建过程中主要设备都实现了国产化，其中年产量 ８万ｔ ＨＤＰＥ低压聚乙烯装置的离心式循环气鼓风机便是一项。此鼓风机在整个生产中起着举足轻重的作用，它将混合气体（已烷５５．５４％、氮气４３．２２％、丁烯－１０．０５％、乙烯０．８８％） 1 Introduction Our plant 480,000 t ethylene expansion and expansion process to achieve the major equipment localization, including annual output of 80,000 t HDPE low pressure polyethylene plant centrifugal recirculation gas blower is one. This blower plays a decisive role in the whole production. It mixes the mixed gas (55.54% of hexane, 43.22% of nitrogen, -10.05% of butene and 0.88% of ethylene)