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Svrcek, W
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Table of Contents

Author Biographies xi

Foreword and Endorsements xiii

Preface xv

Acknowledgements xvii

1 A Brief History of Process Control and Process Simulation 1

1.1 Process Control 1

1.2 Process Simulation 5

References 11

2 Process Control Hardware Fundamentals 15

2.1 Control System Components 15

2.2 Primary Elements 16

2.3 Final Control Elements 33

References 53

3 Fundamentals of Single-Input/Single-Output Systems 55

3.1 Open Loop Control 55

3.2 Disturbances 56

3.3 Feedback Control – Overview 57

3.4 Feedback Control – A Closer Look 60

3.5 Process Attributes – Capacitance and Dead Time 66

3.6 Process Dynamic Response 74

3.7 Process Modelling and Simulation 76

References 93

4 Basic Control Modes 95

4.1 On–Off Control 95

4.2 Proportional (P-Only) Control 97

4.3 Integral (I-Only) Control 102

4.4 Proportional Plus Integral (PI) Control 105

4.5 Derivative Action 107

4.6 Proportional Plus Derivative (PD) Controller 108

4.7 Proportional Integral Derivative (PID) Control 111

4.8 Digital Electronic Controller Forms 112

4.9 Choosing the Correct Controller 112

4.10 Controller Hardware 114

References 117

5 Tuning Feedback Controllers 119

5.1 Quality of Control and Optimization 119

5.2 Tuning Methods 123

References 132

6 Advanced Topics in Classical Automatic Control 133

6.1 Cascade Control 133

6.2 Feedforward Control 137

6.3 Ratio Control 140

6.4 Override Control (Auto Selectors) 142

6.5 Split Range Control 147

References 149

7 Common Control Loops 151

7.1 Flow Loops 151

7.2 Liquid Pressure Loops 153

7.3 Liquid Level Control 155

7.4 Gas Pressure Loops 165

7.5 Temperature Control Loops 166

7.6 Pump Control 172

7.7 Compressor Control 172

7.8 Boiler Control 179

References 182

8 Distillation Column Control 185

8.1 Basic Terms 185

8.2 Steady-State and Dynamic Degrees of Freedom 186

8.3 Control System Objectives and Design Considerations 188

8.4 Methodology for Selection of a Controller Structure 190

8.5 Level, Pressure, Temperature and Composition Control 192

8.6 Optimizing Control 199

Section Sidestream 199

8.7 Distillation Control Scheme Design Using Steady-State Models 204

8.8 Distillation Control Scheme Design Using Dynamic Models 212

References 213

9 Using Steady-State Methods in a Multi-loop Control Scheme 215

9.1 Variable Pairing 215

9.2 The Relative Gain Array 216

9.3 Niederlinski Index 220

9.4 Decoupling Control Loops 220

9.5 Tuning the Controllers for Multi-loop Systems 222

9.6 Practical Examples 222

9.7 Summary 232

References 232

10 Plant-Wide Control 233

10.1 Short-Term versus Long-Term Control Focus 233

10.2 Cascaded Units 235

10.3 Recycle Streams 236

10.4 General Considerations for Plant-Wide Control 241

References 242

11 Advanced Process Control 245

11.1 Advanced Process Control 245

11.2 Model Predictive Control 246

11.3 Dynamic Matrix Control 249

11.4 General Considerations for Model Predictive Control Implementation 253

References 254

Appendix A P&ID Symbols 257

Appendix B Glossary of Terms 261

Appendix C New Capabilities with Control Technology Hardware and Software 267

Workshop 1 Learning through Doing 279

Workshop 2 Feedback Control Loop Concepts 283

Workshop 3 Process Capacity and Dead Time 289

Workshop 4 Feedback Control 295

Workshop 5 Controller Tuning for Capacity and Dead Time Processes 303

Workshop 6 Topics in Advanced Control 311

Workshop 7 Distillation Control 321

Workshop 8 Plant Operability and Controllability 333

Index

About the Author

William Y. Svrcek, Department of Chemical and Petroleum Engineering, University of Calgary, Canada Donald P. Mahoney, Chemical Industry Business Solutions, SAP AG, USA Brent R. Young, Department of Chemical and Materials Engineering, University of Auckland, New Zealand

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