Selection of Controlled and Manipulated Variables
Distillation control philosophy and practice vary greatly. Some control systems are designed using simple PID controllers whereas others are designed around sophisticated model based control algorithms. Some strategies are implemented in state-of-the-art distributed control systems (DCS), whereas others use a collection of more conventional electronic and pneumatic control devices. Distillation control strategies vary in cost and complexity, yet the performance of all strategies, large and small, are at the mercy of the sensor and valve systems to which they are connected. Poor valve choices and/or confused sensor information will render ineffective even the best of control systems.
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