轻烃回收DHX工艺优化及应用  

Optimisation and Application of DHX Process for Light Hydrocarbon Recovery

作　　者：肖乐 尹奎 吴明鸥[2] 涂洁 王刚 马枭[2] Xiao Le;Yin Kui;Wu Ming ou;Tu Jie;Wang Gang;Ma Xiao(China Petroleum Engineering&Construction Corp.Southwest Company,Chengdu,Sichuan,610041,China;Research Institute of Natural Gas Technology,PetroChina Southwest Oil&Gasfield Company,Chengdu,Sichuan,610213,China)

机构地区：[1]中国石油工程建设有限公司西南分公司,四川成都610041 [2]中国石油西南油气田公司天然气研究院,四川成都610213

出　　处：《天然气与石油》2020年第5期36-42,共7页Natural Gas and Oil

基　　金：中国石油天然气集团有限公司科学研究与技术开发项目“北极低温区域LNG工厂及模块设计建造关键技术研究”(2019 B-3203)。

摘　　要：为将国外某轻烃回收厂处理规模扩能至283×104 m 3/d(100MMSCFD),同时满足C 3收率≥95%、C 4收率≥98.5%、利用部分己建设备设施的要求,需对该厂原有的油吸收+丙烷预冷+J-T阀节流制冷工艺进行优化。通过轻烃回收DHX工艺对比,选用了一种丙烷制冷+膨胀机制冷+脱乙烷塔顶气冷凝回流的DHX工艺。该工艺实现了脱乙烷塔顶气两步冷却,有效提高了C 3收率。经工艺优化后,轻烃回收厂C 3收率由原来的60.1%提高至95.5%,C 4收率由原来的61.3%提高至99.7%,LPG产量为210 t/d,增产约130 t/d,达到设计值要求,经济效益显著提高。该工艺方案可为类似工程的设计及优化提供参考。A process optimization has been applied on an existing oil absorption,propane pre-cooling and J-T valve throttling refrigeration process to upgrade the capacity of an overseas light hydrocarbon recovery plant to 2.83 million m 3/d(100 MMSCFD),and meet the requirement of C 3 recovery rate≥95%,C 4 recovery rate≥98.5%,while utilizing parts of the equipment and facilities of existing plant.Compared with DHX process for light hydrocarbon recovery,a DHX process with propane refrigeration,expander refrigeration and deethanizer overhead gas condensation and reflux was selected.This process realizes two-step cooling of the overhead gas of the deethanizer,and effectively improves the C 3 recovery rate.After process optimization,the C 3 recovery rate of the light hydrocarbon recovery plant was increased from the 60.1%to 95.5%,C 4 recovery rate was increased from the 61.3%to 99.7%,LPG production rate improved to 210 t/d,with an increase of approximately 130 t/d.The required process design target has been met,and the economic benefits have been significantly improved.The process is a good reference for the design and optimization of similar projects.

关 键 词：轻烃回收 DHX工艺 优化 C 3收率 LPG 

分 类 号：TQ221[化学工程—有机化工]