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Impact of Internally Heat-Integrated Distillation Column Configuration on Energy Saving

Saber, Mohammad | 2009

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 39775 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering
  6. Advisor(s): Pishvaie, Mahmoud Reza; Rashtchian, Davood
  7. Abstract:
  8. Distillation is the most widely-used but the most energy-consuming separation process in the chemical industry. The thermal energy added at the reboiler is used to evaporate a liquid mixture and is wasted when liquefying the vapor flow at the condenser to obtain a reflux liquid flow. However, the thermal energy recovered at the condenser cannot be used to heat other flows in the same distillation column since its temperature is lower than the other stages. To improve the low energy efficiency of distillation, various new ideas have been proposed in the literature. One of them is the internally heat-integrated distillation column (HIDiC). In a conventional distillation column, the temperature of the rectifying section is lower than that of the stripping section. If the pressure of the rectifying section is higher than the pressure of the stripping section, the temperature of the rectifying section can be higher than that of the stripping section and it can be possible to transfer heat from condenser to reboiler. The aim of the present study is the examination of internally heat-integrated distillation column configuration on energy saving, exergy loss and controllability of distillation operations. Calculations show that heat integration in distillation columns results in about 20% decrease of energy consumption for separation of BTX mixture. Also it finds out that the compression ratio has a strong effect on energy saving and especially on exergy loss in HIDiC. Finally the performance of control system of the condenser temperature was investigated. The obtained results show that the perfor-mance of control system in conventional distillation column is better than that in HIDiC.
  9. Keywords:
  10. Energy Consumption ; Exergy ; Control System ; Distillation Column ; Internally Heat Integration

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