基于内模控制的内部热耦合精馏策略

Internal model control of internal thermally coupled distillation column

精馏过程约占工业总能耗的1/3,其节能控制潜力很大。内部热耦合精馏(ITCDIC)是迄今为止所提出的节能效果最好(比常规精馏节能40%以上)却没有商业化的节能技术。主要原因在于该过程具有较强的非线性、复杂的动态特性以及耦合性,给控制方案的设计带来了极大的困难。通过建立更为精确的二阶内部模型,提出了一种有效的ITCDIC内模控制方案。实例研究结果表明,与传统控制方案PID相比,控制品质更加稳定可靠;同时,与目前国际上公开报道的最好结果相比,该控制方案有更广泛的操作域,鲁棒性更强。

Distillation consumes one third of the total energy in industry.It has great potential for energy saving.Distillation energy-saving technology in internal thermally coupled distillation is the most promising,which can save more than 40% energy compared with traditional distillation process,but it has not been widely used.The bottleneck that prevents the process from being commercialized is the operational difficulties due to the nonlinearity,complex dynamics and interactive nature of the process.Based on an accurate second-order model,an internal model control （IMC） system for ITCDIC is presented and performance evaluation shows its effectiveness.It is more stable and reliable than PID.Also,compared with IMC reported,it has a wider range of operating field and more robust.