Distillation column thesis
Studies on robust control of distillation columns - CaltechTHESIS
Skogestad, Sigurd Studies on distillation column thesis control distillation column thesis distillation columns. Distillation is undoubtedly the most important unit operation in chemical engineering. During design a significant effort is normally put distillation column steady-state optimization of thesis column with respect to its size, feed location and reflux ratio. However, operating the column close to this optimal point requires reasonably tight control of the product compositions.
This is usually not thesis in industrial practice due to stability problems. Improved distillation column for distillation control thesis a viable means for significant economic savings as compared to the existing ad hoc techniques.
distillation column thesis This thesis addresses robust control distillation column thesis distillation columns in distillation column thesis face of model-plant mismatch caused by model uncertainty, nonlinearity thesis changes in operating conditions.
The robust control paradigm, introduced by Doyle and coworkers, is used as the basis for controller design and analysis. An important tool is the Structured Singular Value SSV which thesis the evaluation of a plant's achievable control performance.
This provides a consistent basis for comparing controllers and distillation column thesis alternatives. Achievable performance is also related to other commonly used measures such as the RGA and the condition number.
Physical insight is used to distillation column thesis low-order column models which address the business plan mba dissertation help most important for feedback control. It is shown that the dynamic behavior can be explained in distillation column thesis of the fundamental difference between external distillation column thesis internal flows.
Studies on robust control of distillation columns
This difference manifests itself both at steady-state distillation column thesis thesis the dynamic response. Furthermore, the initial response, which is of principal importance for feedback control, is affected much less by changes click here distillation column thesis operating conditions than is the steady-state response. The initial response is even distillation column markedly affected when logarithmic compositions are used.
An important issue in distillation control is which two of the possible five manipulated inputs should be selected for composition control; each configuration may yield entirely different control performance.
Issues which must be addressed include model uncertainty and dynamic response as well as rejection of flow disturbances by the level loops. Finally, a design method for robust decentralized controllers, which generalizes the SSV-interaction measure of Grosdidier and Morari, distillation column thesis introduced.
Each loop is designed independently such that robust performance of the overall system is guaranteed. A Caltech Library Service.
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