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Performance Assessment of Different Control Structures for Generic Reactive Distillation Using Linear and Nonlinear Process Models
 

Summary: Performance Assessment of Different Control Structures for Generic
Reactive Distillation Using Linear and Nonlinear Process Models
Moshood J. Olanrewaju and Muhammad A. Al-Arfaj*
Department of Chemical Engineering, King Fahd University of Petroleum & Minerals,
Dhahran 31261, Saudi Arabia
This paper compares the closed-loop performance of three control structures using an approximate
linear model to that when a rigorous nonlinear process model is used for a generic reactive
distillation. It is shown that an approximate linear model behaves essentially similarly to a
nonlinear model in a closed-loop system when the deviation of process variables resulting from
the disturbance is within the region of the base steady state. Responses based on the linear
model for various control structures show a good agreement when compared to those based on
the nonlinear model under the same conditions. It is found that the linear process model could
be used to develop a robust control system when the control valves are conservatively designed.
However, it becomes inadequate if the system is open-loop pseudostable or unstable. The
performance of the linear model is shown to be better in a single-end control system than in a
dual-end control system because of the nonlinearity effect, which is more pronounced in the
latter.
1. Introduction
The combination of reaction and distillation in a
single vessel is an old idea that has attracted renewed

  

Source: Al-Arfaj, Muhammad A. - Department of Chemical Engineering, King Fahd University of Petroleum and Minerals

 

Collections: Engineering