Perry’s Chemical Engineers’ Handbook, Eighth Edition

Section 8: Process Control

Overview

Thomas F. Edgar, Ph.D. Professor of Chemical Engineering, University of Texas Austin (Section Editor, Advanced Control Systems, Process Measurements)

Cecil L. Smith, Ph.D. Principal, Cecil L. Smith Inc. (Batch Process Control, Telemetering and Transmission, Digital Technology for Process Control, Process Control and Plant Safety)

F. Greg Shinskey, B.S.Ch.E. Consultant (retired from Foxboro Co.) (Fundamentals of Process Dynamics and Control, Unit Operations Control)

George W. Gassman, B.S.M.E. Senior Research Specialist, Final Control Systems, Fisher Controls International, Inc. (Controllers, Final Control Elements, and Regulators)

Andrew W. R. Waite, P.Eng. Principal Process Control Consultant, EnTech Control, a Division of Emerson Electric Canada (Controllers, Final Control Elements, and Regulators)

Thomas J. McAvoy, Ph.D. Professor of Chemical Engineering, University of Maryland College Park (Fundamentals of Process Dynamics and Control)

Dale E. Seborg, Ph.D. Professor of Chemical Engineering, University of California Santa Barbara (Advanced Control Systems)

FUNDAMENTALS OF PROCESS DYNAMICS AND CONTROL

The General Control System

8-5

Feedback Control

8-5

Feedforward Control

8-5

Computer Control

8-5

Process Dynamics and Mathematical Models

8-5

Open-Loop versus Closed-Loop Dynamics

8-5

Physical Models versus Empirical Models

8-6

Nonlinear versus Linear Models

8-7

Simulation of Dynamic Models

8-7

Laplace Transforms

8-7

Transfer Functions and Block Diagrams

8-8

Continuous versus Discrete Models

8-8

Process Characteristics in Transfer Functions

8-9

Fitting Dynamic Models to Experimental Data

8-12

Feedback Control System Characteristics

8-12

Closing the Loop

8-13

On/Off Control

8-13

Proportional Control

8-14

Proportional-plus-Integral (PI) Control

8-14

Proportional-plus-Integral-plus-Derivative (PID)...

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