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Study of Solutions for Skin Temperature Reduction in Process Fired Heaters

Harounzadeh Arani, Amir | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50885 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Farhadi, Fatholah
  7. Abstract:
  8. Fired heaters are large and complex items used in process plants. Tubular furnaces used mainly in chemical, petrochemical, and refinery process plants. For many process plants, the fired heater performance will determine process unit run-length. High tube metal temperature and coking in the process-fired heaters is one of the serious problems of process plants. Coke forms because the oil in tubes is no longer thermally stable at the operating conditions. Oil film temperature in the inside wall of tube somewhere that, process fluid has highest temperature and lowest velocity. Therefore, process fluid peak film temperature will determined rate of coke formation. This temperature is dependent on peak heat flux, oil mass velocity and bulk temperature. High skin temperatures in fired Heaters are the result of Fired Heater Design Consideration or operating Conditions. Fire-Side Problems (exceeding Fired Heater Duty or Radiation Section Heat Duty from allowable value, non-uniform heat flux distribution, and etc.) or Process-Side Problems (tube size, oil mass velocity, oil residence time and etc.) Influence skin temperature.In this study, Heater H-2001 in Unit-200 of Bouali Sina Petrochemical Complex have been investigated as case study. Six process parameters and seven fired heater design parameters have been analyzed to improve heat flux distribution, reduce radiation section heat duty, and finally reduce Skin temperature in Heater H-2001. By combining the analyzed solutions, 2 Alternatives have been suggested, and By comparing two suggested alternatives, optimal technical and economic solution has been recommended as final solution
  9. Keywords:
  10. Thermal Stability ; Process Fired Heaters ; Skin Temperature ; Radiation Section Heat Duty ; Excess Air ; Air Pre-Heater

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