The lower-loading Stem with backward sealing construction not only prevents the handle form backing-out but also ensures the reliability of the scaling part of the handle. 带倒密封结构的下装式阀杆,不仅防止了阀杆脱出,而且阀杆部位的密封更加可靠。
The process of cooling system in ethylene unit was introduced, the primary fractionation system in the ethylene unit was simulated by using Pro/ ⅱ software, and the components of pyrolytic gas were obtained by the backing-out method. 介绍了乙烯装置急冷系统的工艺流程,运用PRO/Ⅱ软件对乙烯装置初分馏系统进行了模拟,其裂解气成分采用反推法获取。