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Simulation, Control and Dynamic Process Intensification of Heat Integrated Binary Distillation Columns

Parvin, Mahan | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57659 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Vafa, Ehsan
  7. Abstract:
  8. In light of rising energy costs and restricted access to energy resources, enhancing energy efficiency in process industries has become increasingly important. One effective method for reducing energy consumption in chemical industries is the use of thermal integration in distillation columns. This study examines the thermal integration of a benzene-toluene distillation column with the aim of analyzing and improving energy performance from a dynamic intensification perspective. Initially, the internal thermal integration of the distillation column was modeled. Subsequently, a mathematical analysis of the model was conducted to identify conditions of multiplicity. Following this, steady-state and dynamic simulations of the thermally integrated benzene-toluene column were performed. Through these steps, two operating points for dynamic intensification and the implementation of a periodic switching process were identified. To operationalize this process, two control structures were designed and implemented. The first control structure was a cascade system using concentration measurements, while the second control structure was designed without concentration measurements, relying on temperature control compensated by pressure. The dynamic intensification of the system was then demonstrated and analyzed through simulation. The results of this study showed that the thermally integrated distillation column, under conditions of high purity bottom product and high reflux and reboiler steam rates, reached an unstable point, leading to output multiplicity. Additionally, the study revealed that dynamic intensification of the system through periodic switching between two operating points reduced energy consumption by approximately 1.18%. This energy reduction equates to 145,185.6 kWh annually, resulting in annual savings ranging from $9,600 (in the Middle East) to $40,000 (in Europe). The total annual cost, including new equipment construction, maintenance, and wear due to frequent operating point changes, was calculated to be $20,138. These results indicate that considering additional costs, dynamic intensification in regions with more accessible and cheaper energy, despite reducing energy consumption and environmental pollution, may not be economically justified
  9. Keywords:
  10. Heat Integration ; Distillation Column ; Control System Design ; Dynamic Intensification ; Dynamic Simulation ; Dynamic Control ; Heat Integrated Distillation Columns

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