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Chemical Engineering - CHEG 670

Process Control Systems

• Perform material and energy balances on unsteady state systems to form dynamic models.
• Model fluid flow systems.
• Model heat transfer systems.
• Linearize process models to form linear systems of differential equations.
• Apply Laplace transforms to solve linear differential equations.
• Apply Laplace transforms to linear process models and reduce to block diagrams including transfer functions in the Laplace (s) domain.
• Apply the final value theorem to determine the steady state outcome of inputs to process models.
• Use block diagram algebra to extract various transfer functions from process models.
• Simulate process models using SIMULINK.
• Develop blocks for process sensors and transmitters.
• Develop blocks for final control elements.
• Develop blocks for PID controllers.
• Develop block diagrams for single feedback control loops.
• Develop open and closed loop transfer functions for feedback loops.
• Find the ultimate gain and period for a control loop.
• Use the ultimate gain and period to find tuning parameters for PID controllers.
• Characterize a process as a first order plus dead time (FOPDT) process using step test data.
• Tune a control loop using FOPDT parameters.
• Configure and tune cascade loops, and draw their P&I diagrams and block diagrams.
• Design feed forward loops, and draw their P&I diagrams and block diagrams.
• Determine appropriate controlled/manipulated variable pairings using Bristol’s relative gain array.
• Design static and dynamic de-couplers for multivariate loops.
• Using the simulations created above (9), extend the simulation to include controls.
• Test the simulated control systems developed above and report on the effectiveness of the various control schemes.

Prepared by Dr. D. John Griffith