苯乙烯装置苯乙烯精馏单元流程模拟与优化

Process Simulation and Optimization of Styrene Rectification Unit in Styrene Plant

苯乙烯是生产塑料和合成橡胶的重要有机原料。苯乙烯装置包括催化干气脱丙烯单元、乙苯分离单元、苯乙烯精馏单元。本文采用Aspen Plus流程模拟软件,对苯乙烯装置的苯乙烯精馏单元进行模拟,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。模型计算的塔顶温度、塔底温度、产品组成与实际生产控制一致,模拟结果与实际工况非常吻合,可以满足生产优化要求。通过模型对过程的关键参数,如塔的回流比、再沸蒸汽量等进行综合分析,在各塔产品控制指标达标的前提下,选择最优的操作参数,降低装置能耗,提升装置经济效益;并通过模型对塔板水力学进行核算,确定装置的最大负荷,为装置的扩能改造提供支撑。

Styrene is an important organic raw material for the production of plastics and synthetic rubber.Styrene plant consists of FCC dry gas propylene removal unit,ethylbenzene separation unit and styrene rectification unit.This article uses Aspen Plus process simulation software to simulate the styrene rectification unit in styrene plant.Rad Frac module is used for the rectification 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 as the physical property method.The overhead temperature,bottom temperature and product composition calculated by the model are consistent with the actual production control,the simulation results well agree with the actual operating conditions,and the requirements of production optimization can be met.Key process parameters,such as the reflux ratio in tower and the reboiling steam flow rate,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.And the hydraulics of the trays is calculated through the models to determine the maximum load of the plant and support the expansion revamping of the plant.