【Key words】 Daqing Ethylene； Expansion and Reconstruction； De-bottle-neck； Optimal Technique；
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By reviewing the basic expansion and reconstruction models of several big ethylene devices in china, and its character of technology process, we get the basic thought of the 600,000 ton ethylene expansion and reconstruction of daqing ethylene devices.
在综合国内几大乙烯装置扩能改造的基本模式，以及大庆乙烯装置自身的工艺技术特点，提出了大庆乙烯装置60万吨扩能改造的基本思路。
参考来源 - 大庆乙烯装置60万吨扩能改造的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
According to the existing problems in the running of propylene distillation system in Daqing ethylene plant, adopting corresponding optimization measures to reduce the propylene loss.
针对大庆老区乙烯装置丙烯精馏系统运行中出现的问题，对操作过程进行优化调整，达到降低丙烯损失的目的。
By using the statistics analysis method, the reasons for the excessive blowdown of quench water in Daqing Ethylene Plant are found and, some measures are proposed and used to solve the problem.
笔者运用统计学的方法分析了中国石油大庆石化分公司化工一厂乙烯装置急冷水排放量大的原因，并针对这些原因所采取的措施。
The unconverted oil was a good feedstock for steam cracking and its ethylene yield was 2%-3% higher than that of Daqing AGO feedstock.
蒸汽裂解试验显示尾油馏分是很好的蒸汽裂解制乙烯原料，其乙烯收率较大庆ago高2 ~ 3个百分点。
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