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Specialization project 2012

Specialization project 2012. Temperature control of an unstable chemical reactor By Ola Sæterli Hjetland Supervisors: Sigurd Skogestad , Krister Forsman and Vinicius de Oliveira. Project description. Create a simple, generic Matlab model of an unstable CSTR

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Specialization project 2012

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  1. Specializationproject 2012 Temperaturecontrolof an unstablechemicalreactor By Ola Sæterli Hjetland Supervisors: Sigurd Skogestad, Krister Forsman and Vinicius de Oliveira

  2. Project description Create a simple, genericMatlabmodelof an unstable CSTR Simulate PI and PID controloftheprocess Propose a simple way to obtain tuning parameters

  3. ProcessDescription

  4. Control Structures • Power control • Cooling input is linear • CW flowratecontrol • Cooling input is highlynon-linear

  5. Open Loop Behaviour

  6. SIMC Tuning • Step in input at theopen loop steady state Power control CW flowcontrol

  7. Linearization and Transfer Functions • Identifythe operating point (x0, u0) • TF linking T and u (coolingpower or CW flow rate) Power control CW flowcontrol

  8. Tuning Procedures • SIMC (non-linearized, open loop) • Shams* (Linearized, closed loop) • min(Ld) (Linearized, open loop Nyquist plot) *Shamsuzzoha, M., Skogestad, S. A simple approach for on-line PI controller tuning usingclosed-loop setpoint responses, ESCAPE20, 2010

  9. Setpoint Response • 5 K increase in temperature setpoint

  10. DisturbanceRejection • +10% increasedfeed

  11. Stability

  12. Conclusion and FurtherWork • Shams tuning procedureseems like the most promising • Dynamics for valves, sensors etc. • CW flowcontrol • Tuning

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