In order to restrain the influence of non-stationary disturbance to VCM distillation process with integral characteristics by the acetylene method

an effective adaptive MPC method was presented. Due to the integral characteristics of the high boiling tower caused by settling of high-boiling residues to the bottom of tower

liquid level of the high boiling tower was taken as integral variable. Furthermore

in order to restrain the influence of non-stationary disturbance to liquid level of the high boiling tower caused by feed temperature of VCM and other factors

firstly

RELS (recursive extended least squares) algorithm was used to estimate the disturbance; secondly

the proportion of prediction error caused by the disturbance was calculated. Lastly

twiddle factor of adaptive MPC was updated real-time to realize the control of liquid level. Industrial experiments indicated that the adaptive MPC could overcome the non-stationary disturbance effectively

and standard deviation of liquid level was 2.6616 which was reduced by 60.7% than before. The effectiveness of the adaptive MPC was proved.