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应用动态模拟软件DYNSIM开展了异丙苯工艺苯塔自动控制的设计。使用PRO/II建立了苯塔系统的稳态模型,并分析了苯塔压力控制方式及调节阀难以选取的原因为在不同温度、压力以及氮气流量下丙烷在冷凝液中的溶解度变化较大,造成丙烷不凝气瞬间大量释放。通过研究认为采用分程控制调整该塔压力较为合理。采用建立的动态模型研究了在苯塔压力受到干扰后,分程控制方案不同控制曲线对调整塔顶压力的效果。结果表明,经过整定PID参数后,具有不凝气排放和氮气补充同时动作区域的分程控制方案能够在13分钟内调整塔压至设定值。以上研究表明动态模拟软件能够直观地体现化工装置的动态特性,为化工装置设计的安全可靠性提供支撑。
Dynamic design software DYNSIM was used to design the cumene autocontrol system of cumene process. The steady-state model of benzene column system was established by PRO / II, and the reason why the pressure control mode of benzene column and the control valve were difficult to choose was analyzed. The reason is that the solubility of propane in the condensate changed greatly under different temperature, pressure and nitrogen flow rate, Resulting in a large number of propane non-condensable gas release. Through the research that the use of fractional control to adjust the tower pressure is more reasonable. The dynamic model was used to study the effect of different control curves of split-range control scheme on the adjustment of tower pressure after the pressure of benzene column was disturbed. The results show that after the tuning of the PID parameters, a split-range control scheme with simultaneous non-condensable gas and nitrogen replenishment can adjust the column pressure to the setpoint in 13 minutes. The above studies show that dynamic simulation software can intuitively reflect the dynamic characteristics of chemical plants and provide support for the safety and reliability of chemical plant designs.