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Rigorous Synthesis of Optimal Heat Integrated Complex Column Sequences Using Genetic Algorithm

Baroughi, Amir Hossein | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42248 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Bozorgmehri, Ramin; Farhadi, Fathollah
  7. Abstract:
  8. Finding the optimal heat integrated distillation column sequence is an utmost important optimization problem in process engineering. The frequently used approach in this area is to obtain a suitable sequencing candidate and then accomplish the heat integration based on the application of Pinch technology to finalize the design. This approach reduces the problem complexity at the expense of not necessarily reaching the best possible result. This work follows a genetic super structure approach to systematic and rigorous synthesis of optimal multi-component distillation sequences (including simple and thermally coupled complex columns) and simultaneously heat exchanger networks by using a special strategy that makes the chromosome smaller (and hence the size of the search space) and the obtained result more reliable. Another method used is the modifiable or "intelligent chromosomes" which enables the program to modify the chromosomes during the decoding process. As a result, the meaningless chromosomes are corrected and the convergence probability of the resulting flow sheet and the algorithm increases. By using these strategies and also employing complex columns (including side-strippers, side-rectifiers and Petlyuk columns) and simoultaneously designing the heat exchanger network, a significant reduction in both energy consumption and the capital costs was attained. The success of the method demonstrates that rigorous solutions to separation problems can be obtained in a fraction of valuable engineering design time by computer methods.
  9. Keywords:
  10. Heat Exchangers ; Genetic Algorithm ; Process Design ; Complex Columns ; Distillation Columns Sequence (DCS)

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