| A DMC controller was implemented in Bailey low-level control hardware and used to control the effluent concentration of a six inch diameter, sixty-five inch tall pulsed-plate liquid-liquid extraction column. The extraction column and associated control and operations hardware were newly constructed in connection with the project.;Five cases of controller performance were studied: (1) the DMC controller with little manipulated variable penalty, (2) the DMC controller with tuned manipulated variable penalty, (3) the DMC controller with tuned penalty and a second order data filter, (4) a PID controller tuned using Ziegler-Nichols rules and one using IMC rules, and (5) the DMC controller with tuned penalty but the organic feed rate increased from 35% to 50% of maximum flow.;ITAE indexes showed the tuned DMC controller tracked a setpoint change best, followed by the tuned with data filter case (average ITAE 34% greater), then the DMC controller with little penalty (average ITAE 60% greater), and lastly the PID controllers (average ITAE 183% greater). The case with increased feed rate was unstable.;A DMC control algorithm executing in a low-level controller with a sample time of 10 seconds, model horizon of 97, control horizon of 2, and prediction horizon of 15 has been successfully demonstrated. |
