Adaptive Gain Compensator for a Recycle Process

In the presented paper, dynamic state analysis and control aspects of recycle processes are discussed. Analysis of process dynamic behaviour and investigation of influence of process recycle loop parameters onto the overall plant is carried out. A new strategy of compensation of the recycle effects is introduced as a combination of direct compensator part and adaptive gain scheduling technique such that the compensator eliminates the recycle path dynamics only while recycle gain is scheduled in adaptive mode. A hybrid separation process, based on extractive heterogeneous-azeotropic distillation (EHAD), consisting of a 4 column distillation plant, is considered as case study