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Control of a Crystallization Process

Ahmadi Orkomi, Ali | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41314 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Shahrokhi, Mohammad
  7. Abstract:
  8. The object of this research is modeling, simulation and control of a crystallization process. Population balance equation (PBE) has been used for modeling of such processes. Most of the existing numerical methods cannot solve the general form of PBE in presence of the breakage and agglomeration terms and some others are not suitable for control objectives, because of their intractable CPU time. In this work a new developed numerical method called conservation element and solution element (CE/SE) has been used for solving general form of multidimensional population balance equations. The accuracy and effectiveness of the scheme is demonstrated through computer simulation. According to the simulation results, the CE/SE method has been used for control purpose and the optimal batch control of a multidimensional crystallization process is investigated. Optimal temperature trajectory and stirring rate have been found for achieving a desired one-dimensional size distribution with agglomeration effect. Optimizing the aspect ratio and minimizing the batch time have been selected as reasonable objectives for two-dimensional case. It is found that the PI controller can guarantee tracking the optimal temperature path
  9. Keywords:
  10. Optimization ; Control ; Population Balance ; Crystallization ; Conservation Element ; Solution Element

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