Control system for a process

Details Control system for a process Control system for a process

B - Operations, Transporting

01

D

341/111, 341/8

B01D 33/04 (2006.01) B01D 33/00 (2006.01) B01D 37/04 (2006.01) G05B 13/02 (2006.01)

Patent

CA 1240764

CONTROL SYSTEM FOR A PROCESS ABSTRACT OF THE DISCLOSURE A perturbed feedback control system for a process. Inputs to the process include a feed stream and a manipulated variable. The manipulated variable is controlled by a feed- back controller. Measurements of a parameter measured "downstream" of the process are taken periodically and fed back to the controller. The feedback controller generates a control response on the basis of a comparison of the two most recent values of the downstream parameter. The comparison is made by calculating a perturbed set point which includes the values of the downstream parameter taken at the two most recent sampling periods. In a specific embodiment, the per- turbed set point also includes measurements of the most recent and receding values of the manipulated variable. A control response is applied to the manipulated variable by the feedback controller based on the value of the perturbed set point. The control system has been applied to optimize the feed rate of chemicals for sludge dewatering on a twin belt filter press. -1-

481020

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