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A Study to Important the Waste Gas and Air Mixing in an Incinerator Using CFD

Hosseinzadeh Sereshgi, Maryam | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 46602 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Darbandi, Masoud
  7. Abstract:
  8. Incineration of oil wastes is a very important subject in oil refinery Industries. Such wastes may include toxic ports such as CO or hydrocarbon compounds, in either liquid or gas forms. In this project, we simulate an oil refinery incinerator. The industry has decided to increase the waste capacity to 150% of its design conditions. This causes the appearance of CO and methane at the outlet of incinerator stack. We investigated the incinerator operation and-found that we might solve the pollution problem by re-design of air and waste inlets to the incinerator. In this regard, we first simulated the incinerator in its normal operation to validate our numerical modeling. Next, we assumed several modifications to the structure and geometry of waste gas inlet. In modification 1, we added 6 new secondary waste gas inlets to its 8 primitive inlets. The inlets were inclined to the main incinerator having an inclination angle of 45 degrees. In modification 2, we changed the number of waste gas inlets from 8 to 10. The new inlets added to the front of furnace considering installation angles of 0 and 180 degrees. In modification 3, we added four oblique fins at the inlet of main air stream entrance in order to swirl the inlet with a modification 4, we added the swirl option to the secondary air inlet, we simulated the incinerator considering the new four modifications moreover we compared our achieved results with those of the original incinerator without any modification. The results show that all four modifications result in no hydrocarbon species appearance stack, however, the CO would less and more remain there. Among them, modification 3 shows the best performances because it resulted in the least CO content in the stack. The next modification choices would be 4, 1, and 2, respectively. The current study shows that the modification 3 can lead 36% less CO content than that of the incinerator with no modification. The outcome of current study can be similarly applied to many other incinerators, working in aerospace and non-aerospace industries, which are forced to work in similar over-designed waste gas condition
  9. Keywords:
  10. Mixing ; Incinerator ; Computational Fluid Dynamics (CFD) ; Increase Waste Capacity ; Oilrefinery Waste ; Waste Gas Inlet

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