1. Lecture 1 Control Objectives and Benefits 1.Control concept 1.Benefits 1.Process and variables 2.Objectives 1.Design control system -Why do I need to study control? -What’s the meaning of the process var., manipulated var., and disturbance? Chem. Eng. Process Control 06-205 Chemical Engineering Process Control © Il Moon

2. * Control concept Chem. Eng. Process Control

3. The Controller Correction Steam Valve Coldwater In The Process Measurement ComputationComparison Steam Input Hot Water Output The Closed Control Loop

4. * Benefits Safety, Production specifications, Environmental regulations, Operation constraints, Economics Chem. Eng. Process Control

5. * Processes * Type of variables - process variable : control var. - manipulated variable : control var. - disturbance Process (heatexchanger) MV (steam flow rate) disturbance PV Chem. Eng. Process Control

6. * Major objectives of process control 1. Suppressing disturbance (regulatory vs. servo) 2. Ensuring the stability 3. Optimizing the performance max [ sales price – raw material cost – operating cost ] Chem. Eng. Process Control

7. * Design Control System 1. Define control objectives 2. Select measurements 3. Select 4. Select 5. Design the controller Chem. Eng. Process Control