November 2020

Special Focus: Process Controls, Instrumentation and Automation

Advanced process control for unsteady-state operation: A lesser-known technique

A goal of all process industries is to run the plant in a steady-state zone of operation, improving optimization and control, and producing more benefits.

A goal of all process industries is to run the plant in a steady-state zone of operation, improving optimization and control, and producing more benefits. When steady-state operation is achieved, process plant operational outcomes remain at their desired levels or in predicted zones. Unfortunately, disturbances that try to deviate a process from its desired steady state can appear continually, and some may be caused by ambient changes or input conditions, which may vary due to changes in output demands. Such disturbances can create a driving force to divert a process from its steady state of operation to an unsteady state, increasing losses in process value. Often, human interference is req

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