乙烯装置自回流脱甲烷塔运行分析  

Operation Analysis of Self Reflux Demethanizer in Ethylene Plant

作　　者：任晓园 Ren Xiaoyuan(Sinochem Quanzhou Petrochemicals Co.,Ltd.,Quanzhou 362000,China)

机构地区：[1]中化泉化石化有限公司,福建泉州362000

出　　处：《山东化工》2024年第3期169-172,共4页Shandong Chemical Industry

摘　　要：中化泉州石化乙烯装置自2020年9月开工以来,多次出现脱甲烷塔塔顶乙烯重组分超标、塔顶回流罐满液位等工况,且前冷及脱甲烷单元首次开车过程用时较长。2022年第一次停车检修期间将自回流式脱甲烷塔塔顶冷凝器入口滤网摘除,开车后脱甲烷塔塔顶高压尾气中乙烯含量满负荷工况下乙烯体积分数不超过0.03%,塔顶回流罐液位稳定在10%~12%。并通过分析本装置历次脱甲烷塔开车过程,对C3洗油投用、液相甲烷外送焦汤阀投用节点、开车期间乙烯冷剂控制方式、脱甲烷塔压力选择、塔顶重组分异常变化工艺调整方向进行分析,为同类型深冷精馏单元提供开车经验。Since the start of operation in September 2020,the ethylene plant of Sinochem Quanzhou Petrochemical has experienced multiple operating conditions such as excessive ethylene heavy fraction at the top of the demethanizer tower/full liquid level in the reflux tank at the top of the tower,and the first start-up process of the per cooling and demethanizer units takes a long time.During the first shutdown and maintenance period in 2022,the inlet filter screen of the overhead condenser of the self reflux demethanizer was removed.After start-up,the ethylene content in the high-pressure exhaust gas at the top of the demethanizer tower under full load conditions did not exceed 0.03%,and the liquid level in the overhead reflux tank remained stable at 10%~12%.And by analyzing the previous start-up processes of the demethanizer in this device,the nodes of C3 washing oil injection,liquid phase methane delivery coke valve injection,ethylene refrigerant control method during start-up,demethanizer pressure selection,and abnormal changes in the process adjustment direction of the top heavy component are analyzed,providing start-up experience for similar deep cooling distillation units.

关 键 词：前冷 自回流 脱甲烷塔 开车 

分 类 号：TQ028[化学工程]