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This chapter outlines a systematic methodology for designing multiunit controllers in chemical processes, focusing on essential steps such as identifying process objectives and constraints, evaluating significant disturbances, and implementing effective sensor and control valve placements. It includes strategies for degree-of-freedom analysis, energy management, production rate control, and inventory management. The case studies of a splitter and a recycle reactor illustrate practical applications of these principles, showcasing how to select manipulated variables and develop constraint handling strategies for process optimization.
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Approach to Multiunit Controller Design • 1. Identify process objectives. • 2. Identify the process constraints. • 3. Identify significant disturbances. • 4. Determine the type and location of sensors. • 5. Determine the location of control valves. • 6. Apply a degree-of-freedom analysis. • 7. Implement energy management.
Approach (Continued) • 8. Control process production rate. • 9. Select the manipulated variables that meet the control objectives. • 10. Address how disturbances will be handled. • 11. Develop a constraint handling strategy. • 12. Control inventories. • 13. Check component balances. • 14. Control individual unit operations. • 15. Apply process optimization.
C2 Splitter Case Study • 1. Identify process objectives. • 2. Identify the process constraints. • 3. Identify significant disturbances. • 4. Determine the type and location of sensors. • 5. Determine the location of control valves.
C2 Splitter Case Study • 6. Apply a degree-of-freedom analysis. • 7. Implement energy management. • 8. Control process production rate. • 9. Select the manipulated variables that meet the control objectives. • 10. Address how disturbances will be handled.
C2 Splitter Case Study • 11. Develop a constraint handling strategy. • 12. Control inventories. • 13. Check component balances. • 14. Control individual unit operations. • 15. Apply process optimization.
Recycle Reactor Case Study • 1. Identify process objectives. • 2. Identify the process constraints. • 3. Identify significant disturbances. • 4. Determine the type and location of sensors. • 5. Determine the location of control valves.
Recycle Reactor Case Study • 6. Apply a degree-of-freedom analysis. • 7. Implement energy management. • 8. Control process production rate. • 9. Select the manipulated variables that meet the control objectives. • 10. Address how disturbances will be handled.
Recycle Reactor Case Study • 11. Develop a constraint handling strategy. • 12. Control inventories. • 13. Check component balances. • 14. Control individual unit operations. • 15. Apply process optimization.
