Process modeling, simulation, and control for chemical engineers
The purpose of this book is to convey to undergraduate students an understanding of those areas of process control that all chemical engineers need to know. The presentation is concise, readable and restricted to only essential elements. The methods presented have been successfully applied in industry to solve real problems. Analysis of closedloop dynamics in the time, Laplace, frequency and sample-data domains are covered. Designing simple regulatory control systems for multivariable processes is discussed. The practical aspects of process control are presented sizing control valves, tuning controllers, developing control structures and considering interaction between plant design and control. Practical simple identification methods are covered.
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Bode plots Calculate Chap chemical engineering closedloop characteristic equation closedloop log modulus closedloop system closedloop unstable composition condenser constant control loop control system control valve controlled variable controller gain cooling water CSTR curve deadtime derivative distillation column dynamic eigenvalues Example feed feedback controller feedforward feedforward control FIGURE first-order lag flow rate frequency gives GM(J heat exchanger holdup input integration jacket Laplace domain Laplace transformation linear liquid load disturbance lX5s manipulated variable matrix maximum closedloop log multivariable Nichols chart Nichols plots nonlinear Nyquist plot ODEs openloop transfer function parameters phase angle phase margin PI controller plane poles pressure drop proportional controller psig reaction reactor reboiler reflux drum response root locus plot sampling period second-order setpoint shown in Fig signal sketched in Fig solve specific stability steadystate gain step change SUBROUTINE tank tion transmitter tray ultimate gain unit circle vapor zero zero-order hold