Specialization project 2012 Temperature control of an unstable chemical reactor By Ola Sæterli Hjetland Supervisors: Sigurd Skogestad, Krister Forsman.

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Presentation transcript:

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 Simulate PI and PID control of the process Propose a simple way to obtain tuning parameters

Process Description

Control Structures Power control Cooling input is linear CW flowrate control Cooling input is highly non-linear

Open Loop Behaviour

SIMC Tuning Step in input at the open loop steady state Power control CW flow control

Linearization and Transfer Functions Identify the operating point (x 0, u 0 ) TF linking T and u (cooling power or CW flow rate) Power control CW flow control

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

Setpoint Response 5 K increase in temperature setpoint

Disturbance Rejection +10% increased feed

Stability

Conclusion and Further Work Shams tuning procedure seems like the most promising Dynamics for valves, sensors etc. CW flow control Tuning