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Screening alternative structures for plant control systems

The purpose of this project is to develop an approach to the design of control systems for complete chemical plants. The procedure begins with an examination of one or more economically attractive process flowsheet and considers design modifications that will simplify the control problem when such modifications can be justified by the process economics. One or more plant control structures that are interesting candidates are suggested based on the list of disturbances. These schemes are then screened from on a steady-state basis to narrow the range of candidates. The remaining structures are evaluated with simple dynamic models in order to incorporate the entire flowsheet. A prototype software implementation for the procedure is being written, that will include a hierarchy of steady-state and dynamic models for process units and that will provide a few candidate structures and initial conditions for rigorous dynamic simulations using a tool such as SPEEDUP. In the last year, we have implemented most of the steady-state analysis in the prototype software and are in the process of adding and developing dynamic models for representative process units.