Abstract: The cracking performance of ethylene plant was evaluated based on the design indexes and production data of cracking raw materials (naphtha and hydrogenated tail oil) in Fushun petrochemical ethylene plant. Firstly, the component, physical parameter and cracked gas composition of ethylene cracking feedstock were measured, and then the decomposition temperature, dilution ratio, pace time, cleaning cycle, oil price and fragmentation depth were compared. At the same time, the influence the properties of pyrolysis raw materials on the product yield was examined. The last step was to make a comparison between manufacturing data and design indicator, and to propose some concrete measures to optimize its system. The results demonstrated that the physical property indexes of naphtha and hydrogenation tail oil were within the range of allowable design, but their cracked gas yield exceeded the design value. The total yield of ethylene, diene, methane and hydrogen derived from cracking naphtha was 4.57% higher than the result of crackers originated in hydrogenation tail oil. The yield of ethylene and diene showed 0.44% and 0.63% rise respectively. However, C4, C5, C6-C8, C9 and fuel oil from cracking naphtha had relative lower yield (5.18%) in contrast to those from cracking hydrogenation tail oil.

Key words: Ethylene unit, Cracking feedstock, Product yield, Operation parameter

摘要： 采用抚顺石化乙烯装置裂解原料（石脑油和加氢尾油）的设计指标和生产实测数据作为主要分析依据。首先测定乙烯裂解原料的组分、物性参数及裂解气组成，从而对比两种原料对应的裂解温度、稀释比、停留时间、清焦周期、油品单价及裂解深度等参数，同时考查裂解原料性质对其产物收率的影响，最后比较实际生产数据与设计参数的差异，并提出具体优化措施。结果表明，石脑油和加氢尾油原料及其裂解产物的物性测试指标均在设计允许范围内，但两种原料裂解气的收率均高于设计值，且石脑油原料裂解的乙烯、双烯、甲烷和氢气的总收率比加氢尾油裂解产物的收率高出4.57%，其中乙烯和双烯收率分别高出0.44%及0.63%，而碳四、碳五、碳六至碳八、碳九及燃料油等重组分产物的收率与加氢尾油裂解产物的收率相比降低5.18%。

关键词: 乙烯装置, 裂解原料, 产品收率, 操作参数