Plantwide Control of Chemical Processes
Plantwide Control of Chemical Processes. Instructor: Prof. Nitin Kaistha, Department of Chemical Engineering, IIT Kanpur. The issue of control structure selection, where the control system designer must make decisions as to what variables need to be controlled and the corresponding manipulated variables, is usually treated in a very perfunctory manner in courses on control theory. In practical chemical process operation, it is this choice of the control structure that turns out to be crucial towards effective disturbance rejection and maximizing process profitability. Given the large number of control degrees-of-freedom even for the simplest of chemical processes with material/energy recycle, how does one systematically design an effective plant-wide control system? This course addresses the same using an engineering common sense approach. Essential process control theory fundamentals are very briefly covered followed by control structure design for common unit operations such as reactors, distillation columns, heat exchangers and miscellaneous operations (furnaces, refrigeration systems etc). Issues in plantwide control such as proper inventory management and effect of material/energy recycle are then highlighted followed by comprehensive plant-wide control system design case-studies on example processes. Control structure design considerations for maximizing plant profitability are explicitly covered. (from nptel.ac.in)
| Lecture 26 - Two Column Recycle Process |
Topics covered in this lecture: Economic trade-offs in process operation, Proper choice of controlled variables and their setpoints, Illustration of capacity constraints dictating control structure.
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