Distillation column design thesis

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Skogestad, Sigurd Studies on robust distillation column design of distillation columns. Distillation is undoubtedly the most important unit operation in chemical engineering.

During thesis a significant effort is normally put into steady-state optimization of the column with respect to its size, feed location and reflux ratio. However, operating the distillation column close to design thesis optimal point requires reasonably tight control of the product compositions.

This is usually not achieved in industrial practice due to stability problems. Improved strategies for distillation control offer a viable distillation column for significant economic savings as design thesis to the existing ad hoc techniques.

This thesis addresses robust control of distillation columns in the face of model-plant mismatch caused by design thesis uncertainty, nonlinearity and changes design thesis operating conditions. The robust control paradigm, introduced by Doyle design thesis coworkers, is used as the thesis for controller design and analysis.

An important tool is the Structured Singular Value SSV which distillation column design the evaluation of a plant's achievable control performance.

This provides a consistent basis for comparing controllers and design alternatives. Achievable performance is also related to other commonly used distillation column design thesis such as the RGA and the condition number.

Physical insight is used distillation column design thesis derive low-order column models which address the issues most important for feedback control.

It is shown that the dynamic behavior can be explained in terms thesis the fundamental difference between external and internal flows. This difference manifests itself both at steady-state carroll college admissions in the dynamic response.

Furthermore, the initial response, which is of principal importance for feedback control, is affected much less by changes in the operating conditions than is the steady-state response. Distillation column design initial response is even thesis markedly affected when logarithmic compositions are used. An important issue in distillation control is which two of distillation column design thesis 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 distillation column dynamic response thesis well as rejection of flow disturbances by distillation column design thesis level loops. Finally, a design method for robust decentralized controllers, which generalizes the SSV-interaction measure of Learn more here and Morari, is introduced.

Each loop is designed independently such that robust performance of the overall system is guaranteed. A Caltech Design thesis Service.

Studies on robust control of distillation columns

Studies on robust control of distillation columns. Distillation column design Thesis, Sigurd Studies thesis robust control of distillation columns. Abstract Distillation is distillation column design thesis the most important unit operation in chemical engineering.

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Studies on robust control of distillation columns - CaltechTHESIS

Studies on robust control of distillation columns Citation Skogestad, Distillation column design thesis Studies on robust control of distillation columns. Morari, Manfred chair Stephanopoulos, Gregory N. No commercial reproduction, distribution, display or performance rights in this work are provided.

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