双反应段蒸馏塔的动态特性与控制

摘要

针对理想两步连续可逆反应, 通过开环和闭环仿真研究了双反应段蒸馏塔 (RDC-DRS) 的动态特性和可控性.开环仿真结果显示:对于调节通道, 尽管双反应段的安排使得塔顶产品浓度和回流流量之间的过程增益有所降低, 但也减弱了塔顶产品浓度和再沸器之间的相互耦合.相比于单反应段蒸馏塔 (RDC-SRS), RDC-DRS的可控性仍有所提高.对于扰动通道, 双反应段的安排并没有改变系统对进料流量扰动的灵敏度.闭环仿真结果显示:在进料流量扰动和组分扰动的情况下, 相比于RDC-SRS, RDC-DRS表现出更好的抗干扰性能.综合上述结果可知, 针对理想两步连续可逆反应的分离操作, RDC-DRS比RDC-SRS具有更优越的动态特性和可控性.%For the ideal two-stage consecutive reversible reaction, the dynamics and controllability of the reactive distillation column with double reactive sections (RDC-DRS) were studied by the open-loop and closed-loop simulations. The open-loop simulation indicates that in the regulation path, although the arrangement of double reactive sections reduces slightly the process gains between the top product composition and reflux flow rate, it also alleviates the interaction between the top product composition and reboiler heat duty, leading to net improvement in process controllability in comparison with the reactive distillation column with single reactive section (RDC-SRS). In the disturbance path, the arrangement of double reactive sections does not affect the sensitivities of the RDC-DRS to feed flow rate disturbances. The closed-loop simulation indicates that the RDC-DRS gains enhanced capability of suppressing disturbances from feed flow rates and compositions as compared with the RDC-SRS. The overall results confirm that the RDC-DRS gains better process dynamics and controllability than the RDC-SRS.