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Simulation of Heat & Momentum Balance of Vacuum Bottom Flow in Thermal Cracking Fired Heater

Naser Shariat, Mohadese | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51376 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Farhadi, Fathollah
  7. Abstract:
  8. The delayed coking process is one of the common thermal process technique that used to improve the quality of heavy oil. In this process, heavy feeds such as vacuum residues have been heated in the furnace to temperatures up to the 480-500 °C. For the cracking reactions the heated feed have been sent to the drum that is placed after the furnace. Since the reactions begin inside the furnace and coke is one of the products, deposited on the wall of the tube. With the deposition of coke on the tube wall and the reduction of heat transfer, the temperature of the tube have been increased with the increasing of the flame temperature to save constant heat flux. Therefore, the study of thermal cracking kinetics inside the furnace tubes and effect of changing the operating parameters on the kinetics to calculate the amount of coke formed inside the tube is so important. The purpose of this study is to modeling the vacuum residue flow inside the furnace tubes to investigate the effect of operating parameters on tube temperature and kinetics of the reactions. In modeling, due to the high heat flux in the furnace, the fluid velocity in the tube indicate a great influence on the temperature of the tube. The produced coke inside the tube at a temperature range of 425 to 450ºC in a 4-inch tube and a 15000 Btu / hr.ft2 heat flux in this model is estimated at 0.3 mass percent
  9. Keywords:
  10. Heavy Oil ; Delayed Coking ; Furnaces ; Coke ; Thermal Break

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