乙烯装置氮气预冷及低排放开停工优化措施  

OPTIMIZATION OF NITROGEN PRE-COOLING AND LOW-EMISSION START-UP AND SHUTDOWN PROCESS FOR ETHYLENE PLANT

作　　者：洪琨 曾飞鹏[1] 张乐[1] 蒋鹏飞 刘坡 Hong Kun;Zeng Feipeng;Zhang Le;Jiang Pengfei;Liu Po(PetroChina Dushanzi Petrochemical Company,Dushanzi,Xinjiang,P.C.833699)

机构地区：[1]中国石油天然气股份有限公司独山子石化分公司

出　　处：《乙烯工业》2019年第4期34-39,I0002,共7页Ethylene Industry

摘　　要：乙烯装置开停工过程中的火炬排放是制约其成本的关键。同时,火炬的排放会影响环境,随着环保要求的提高,如何降低开车成本和火炬排放量,成为企业关注的核心。着重介绍了中国石油独山子石化分公司乙烯装置氮气预冷开车的过程,在正式投料前通过裂解气压缩机进行氮气循环对冷箱系统进行预冷,将冷箱最低温度降低至-120℃。另外,针对具体流程进行了相应的技术改造,对预冷后的冷分离区域进行提前充压至进料压力,同时对热分离区进行提前充压充液全回流操作,一旦接料可直接产出合格的塔顶和塔釜产品,以此减少开停工过程中的火炬排放,实现了停工过程"气不上天、油不落地、声不扰民、尘不上天"的绿色环保停工目标。Flare emissions during the start-up and shutdown process of an ethylene plant are the key to its cost.Meanwhile,flare emissions will affect the environment.With the improvement of environmental protection requirements,how to reduce the start-up cost and flare emissions has become the focus of enterprises.This paper introduces the nitrogen pre-cooling of the ethylene plant at PetroChina Dushanzi Petrochemical Company.Nitrogen circulation was carried out by cracking gas compressor for the pre-cooling of heat exchangers in low temperature zone system prior to the formal feeding,and the minimum temperature of the heat exchangers in low temperature zone system was reduced to-120℃.In addition,corresponding technical transformation was carried out for the specific process,the cold separation zone after pre-cooling was precharged to the feed pressure,and the hot separation zone was precharged and filled with corresponding liquid.Once the feed was in,on-spec overhead and bottom products could be produced,so as to reduce the flare emissions during the start-up and shutdown process and achieve the goal of no gas,no oil,no noise and no dust during the start-up and shutdown process.

关 键 词：乙烯装置 氮气预冷 低排放 技措 

分 类 号：F42[经济管理—产业经济]