抄録
In order to understand the operating feasibility of the ideal heat integrated distillation column (HIDiC), its control systems are studied in both time and frequency domains with respect to three operating conditions (i.e., feed thermal condition, q < 0.5, q = 0.5 and q > 0.5). It was found that the ideal HIDiC could be operated quite smoothly under all these operating conditions. However, the strongest interaction between top and bottom control loops is observed at q=0.5, and the system resilience may be degraded when q strays from 0.5 because of the strong gain directionality of the process.
The feed location also strongly affects the dynamic performance of the ideal HIDiC. Placing feed in the middle of the process could intensify the interaction between the top and bottom control loops. Therefore, the determination of both feed thermal condition and feed location should be based on a careful compromise between steady state energy saving and dynamic resiliency of the system.
