苯乙烯装置乙苯单元的流程模拟与优化

Process Simulation and Optimization of Ethylbenzene Unit in Styrene Plant

苯乙烯是生产塑料和合成橡胶的重要有机原料,是仅次于聚乙烯（PE）、聚氯乙烯（PVC）、环氧乙烷（EO）的第四大乙烯衍生产品,用途十分广泛。采用Aspen Plus流程模拟软件对苯乙烯装置的催化干气脱丙烯单元、乙苯分离单元进行模拟,精馏塔采用Rad Frac模块,换热器采用Heater模块,分离器采用Flash2模块,混合器采用Mixer模块,分流器采用FSplit模块,泵采用Pump模块;物性方法选用PENG-ROB。通过模型对过程的关键参数,如塔的回流比、进料板位置和侧抽板位置、吸收剂流量温度等进行综合分析,在各塔产品控制指标达标前提下,选择最优操作参数,降低装置能耗,提升装置经济效益。中国石化共有苯乙烯装置10套,其中2套装置依据本文提出的优化方案实施流程模拟后,合计实现装置挖潜增效632万元,提高了苯乙烯装置的精细化操作水平和管理水平。

Styrene is an important organic raw material for the production of plastics and synthetic rubber.As the fourth largest ethylene derivatives after polyethylene（PE）,polyvinyl chloride（PVC） and ethylene oxide（EO）,it has wide applications.Aspen Plus process simulation software is used to simulate the FCC dry gas propy-lene removal unit and ethylbenzene separation unit in styrene plant.Rad Frac module is used for the rectifica-tion tower,Heater module is used for the heat exchanger,Flash2 module is used for the separator,Mixer module is used for the mixer,FSplit module is used for the splitter,Pump module is used for the pump,and PENG-ROB is selected for the physical property method.Key process parameters,such as the reflux ratio in tower,the location of feeding tray,the location of side draw tray and the flow rate and temperature of absorbent,are comprehensively analyzed through the models,and optimal operating parameters are selected under the premise that the control indexes of products from the towers meet the standards,so as to reduce the energy consumption and improve the economic benefit of the plant.SINOPEC has a total of 10 styrene plants,and process simulation was carried out on 2 of them according to the optimization scheme proposed in this paper,increasing the benefit by 6.32 million yuan in total and improving the fine operation level and man-agement level of the styrene plants.