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中文摘要：
动态模型是化工过程进行控制系统设计和动态优化的基础。本文基于二甲苯异构化反应机理,基于Aspen过程模拟软件平台实现了二甲苯异构化单元的稳态和动态模拟,重点分析了异构化反应过程关键运行指标乙苯转化率、二甲苯异构化率以及芳烃损失在其关键操作变量——反应温度、反应压力以及反应器进料流量等变化情况下的动态响应。模拟结果表明：所建立的动态模型与稳态模型具有较好的一致性;在反应温度、反应压力以及进料流量阶跃变化时,异构化反应过程中的乙苯转化率、对二甲苯异构化率和芳烃损失变化情况符合实际情况;建立的控制方案可满足生产操作过程在不同稳态操作工况之间的切换。仿真结果验证了本文所述方法的有效性,为进一步的动态优化工作提供了可靠模型基础。
英文摘要：
Dynamic model is the basis of control design and dynamic optimization for chemical process. This paper achieves the steady-state and dynamic models of xylene isomerization reaction based on Aspen Platform. By means of the established model, the dynamic response of the key indicators of performance including the conversion of ethylbenzene, P-xylene isomerization rate, and loss of aromatics of the reaction process are analyzed, under the effect operational variables including reaction temperature, reaction pressure, and reaction feed flow rate. Simulation results show that the proposed dynamic model has better uniformity with the steady-state model, and the EB conversion rate, PX isomerization rate, and aromatic loss tally with the actual situation under the step change of reaction temperature, reaction pressure and reaction flow rate. Moreover, this control strategy can meet the switching operation among different steady-states.
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