反应精馏隔壁塔开车过程动态特性与安全分析

Dynamic behavior and safety analysis of start-up process for reactive dividing wall column

基于乙酸甲酯的合成,在建立反应精馏隔壁塔(RDWC)稳态流程和动态控制结构基础上,设计开车方案模拟空塔开车过程,基于过程路径指数(PRI)评估开车过程的动态安全。结果表明:该方案中RDWC动态行为与动态安全在6 h时达到稳态;动态响应变化中,3股产品物流的纯度与流量随着反应进行均达到初始设计值,全塔塔板温度与稳态模型基本吻合;动态安全的变化中,物流的PRI值震荡变化,从0升至1.858,开车过程全塔安全状态处于总体降低趋势。

Based on the production of methyl acetate synthesis reaction,the steady-state and dynamic control model of the RDWC(Reactive dividing wall column)were built,and then the start-up process of empty column was simulated.In addition,the process route index(PRI)was used to evaluate the dynamic safety of the entire process.It is found that the dynamic behavior and dynamic safety of RDWC reach a stable operating state within 6 hours in this scheme.The dynamic responses show that the purity and flow rate of three product streams reach the setting value with the occurrence of the reaction.The temperatures of all stages gradually increase with the duty of the column,and finally it is consistent with the steady-state model.The dynamic safety changes show that the PRI value of all streams rises from 0 to 1.858,which reflects the safety state of the entire column is in an overall downward trend during the start-up process.