Cecil L Smith

Practical Process Control

Tuning and Troubleshooting

• Gebundenes Buch

Produktbeschreibung

Practical troubleshooting advice that's easy to understand and easy to implement Practical Process Control shows you how to analyze and troubleshoot process control systems in process manufacturing plants. Easy to read and understand, the book stresses practical solutions that don't require complex mathematics. This book offers several advantages that you won't find in comparable texts. For example, the presentation is totally in the time domain--the word "Laplace" is nowhere to be found. In addition, the focus of the book is troubleshooting, not tuning. The author effectively demonstrates why tuning difficulties are almost always symptoms of other problems. By showing you how to recognize the clues, identify the root causes of the problem, and make needed corrections, you'll learn how to effectively troubleshoot problems before they mushroom into disasters. Practical Process Control gives you even more support in troubleshooting process control systems by... * Focusing on the relationship of process control to steady-state process characteristics rather than to dynamic process characteristics * Demystifying PID control equations by explaining them in the time domain * Helping you develop and analyze process and instrument (P&I) diagrams and demonstrating why they are critical to troubleshooting Filled with real-world examples, the book enables engineers to easily implement the author's troubleshooting guidelines in order to ensure that their plants operate safely, efficiently, and economically.

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Produktdetails

• Verlag: Wiley
• Seitenzahl: 448
• Erscheinungstermin: 1. Februar 2009
• Englisch
• Abmessung: 240mm x 183mm x 28mm
• Gewicht: 747g
• ISBN-13: 9780470381939
• ISBN-10: 0470381930
• Artikelnr.: 25561996

Autorenporträt

CECIL L. SMITH, PHD, has over thirty-five years' experience in process control, his expertise encompassing every control technology being applied in industrial production facilities. In continuous processes, he has worked with oil refining, pulp/paper, power generation, and ore processing. In batch processes, he has experience with both single-product processes (such as PVC reactors and pulp digesters) and the multiproduct (flexible batch) processes that are the norm in specialty chemicals. His primary focus is on designing a control strategy for a process and then commissioning the controls; that is, the process aspects as opposed to systems aspects. He also develops and teaches continuing education courses for practicing engineers on various aspects of process control and instrumentation.

Inhaltsangabe

Preface.
Chapter 1: Introduction.
1.1. The Process Industries and Regulatory Control.
1.2. P&I Diagrams.
1.3. Regulatory Control Example.
1.4. Control Loop.
1.5. Example Process.
1.6. Cascade Control.
1.7. Summary.
Chapter 2: Gain or Sensitivity.
2.1. Process Design versus Process Control.
2.2. What Do We Mean by "Process Gain"
2.3. Linear versus Nonlinear Processes.
2.4. Operating Lines and Gains from Process Tests.
2.5. Action.
2.6. Impact of Process Nonlinearities on Tuning.
2.7. Scheduled Tuning.
2.8. Heat Transfer Processes.
2.9. Vacuum Processes.
2.10. Summary.
Chapter 3: Process Dynamics.
3.1. First-Order Lag and Time Constant.
3.2. Integrating Process.
3.3. Self-Regulated versus Non-Self-Regulated Processes.
3.4. Dead Time.
3.5. Measurement Issues.
3.6. Effect of Dead Time on Loop Performance.
3.7. Mixing.
3.8. Process Models.
3.9. Approximating Time Constants.
3.10. Ultimate Gain and Ultimate Period.
3.11. Damping.
3.12. Simple Performance Measures.
3.13. The Integral Criteria.
3.14. Summary.
Chapter 4: Controller Modes and Mode Selection.
4.1. Mode Characteristics.
4.2 Options for Tuning Coefficients.
4.3. Computing the PID Control Equation.
4.4. Mode Combinations.
4.5. Flow Control.
4.6. Level Control.
4.7. Nonlinear Algorithms.
4.8. Level-to-Flow Cascade.
4.9. Summary.
Chapter 5: Proportional Mode.
5.1. Control Equation.
5.2. Regulators.
5.3. The Proportional Band.
5.4. Bumpless Transfer.
5.5. Set-Point Changes.
5.6. Disturbance or Load Changes.
5.7. Proportional Control of Simple Models.
5.8. Adjusting the Controller Gain.
5.9. Tuning.
5.10. Summary.
Chapter 6: Integral Mode.
6.1. Control Equation.
6.2. Open-Loop Behavior.
6.3. Effect of Reset Time.
6.4. PI Control of Simple Models.
6.5. Tuning.
6.6. Speed of Response.
6.7. Avoiding Sloppy Tuning.
6.8. Suppressing the Proportional Kick.
6.9. Windup Protection.
6.10. Summary.
Chapter 7: Derivative Mode.
7.1. Control Equation.
7.2. Incorporating Derivative into the Control Equation.
7.3. PID Control Equations.
7.4. Effect of Derivative Time.
7.5. Getting the Most from Derivative.
7.6. PID Control of Simple Models.
7.7. Tuning.
7.8. Summary.
Chapter 8: Tuning Methods.
8.1. What Is a Tuning Method.
8.2. Process Characterizations.
8.3. Ziegler-Nichols Closed Loop Method.
8.4. The Relay Method.
8.5. Open-Loop Methods.
8.6. Graphical Constructions and Nonlinear Regression.
8.7. Ziegler-Nichols Open-Loop Method.
8.8. The Lambda Method.
8.9. IMC Method.
8.10. Integral Criteria Method.
8.11. Summary.
Chapter 9: Measurement Devices.
9.1. Steady-State Behavior.
9.2. Very Small Process Gain.
9.3. Temperature Measurements.
9.4. Filtering and Smoothing.
9.5. Summary.
Chapter 10: Final Control Elements.
10.1. Valves and Flow Systems.
10.2. Valve Sizing.
10.3. Inherent Valve Characteristics.
10.4. Flow System Dominated by Control Valve.
10.5. Flow System Dominated by Process.
10.6. Valve Nonidealities.
10.7. Valve Positioner.
10.8. On-Off Control.
10.9. Time Proportioning Control.
10.10. Variable Speed Pumping.
10.11. Summary.
Chapter 11: Process and Instrumentation Diagrams.
11.1. Developing P&I Diagrams.
11.2. P&I Diagram for a Chlorine Vaporizer.
11.3. Simple PID Control Configuration.
11.4. Temperature-to-Flow Cascade.
11.5. Temperature-to-Flow-Ratio Cascade.
11.6. Steam Heater with Control Valve on Steam.
11.7. Steam Heater with Control Valve on Condensate.
11.8. Liquid Bypass Arrangements.
11.9. Summary.
Chapter 12: Loop Interaction.
12.1. Multivariable Processes.
12.2. Off-Gas System.
12.3. Flow and Pressure Control.
12.4. Gains and Sensitivities.
12.5. Effect of Interaction on Loop Performance and Tuning.
12.6. Dynamics.
12.7. Addressing Interaction Problems.
12.8. Summary.
Index.