Numerical Study of Oxygen Enrichment on NO Pollution Spread in an Ignition Chamber

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Orshesh, Zohreh | 2012

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Type of Document: M.Sc. Thesis
Language: English
Document No: 43286 (58)
University: Sharif University of Technology, International Campus, Kish Island
Department: Science and Engineering
Advisor(s): Kazemzadeh Hannani, Siamak
Abstract:
In the present study, a 3D combustion chamber was simulated using FLUENT6.32. The objectives were to obtain detailed information on the combustion characteristics and NO formation in the furnace, and also to examine the effect of Oxygen enrichment on the combustion process. The combustion chamber has internal dimensions of 60 cm wide, 90 cm high and 190 cm long. The fuel pipe diameter is 1.25 cm and the air pipe diameter is 3.5 cm. The 3-D Reynolds Averaged Navier Stokes (RANS) equations together with standard k-ε turbulence model are solved by Fluent 6.3. Air/fuel flow rate ratio is varied as 1.3, 3.2 and 5.1 and the oxygen enriched flow rates are 28, 54, 68 lit/min. NO emission was investigated, including the thermal NO, the prompt NO and the fuel-NO. The results show that for air/fuel flow rate=1.3, increasing the oxygen flow rate at the oxygen lance decreases the NO emission. Additionally, in a fixed oxygen enrichment condition, increasing the air/fuel ratio will increase the temperature peak but not the NO emission rate. As a result, oxygenenrichment can reduce the NO emission at this kind of furnace at low air/fuel flow rates
Keywords:
Combustion Chamber ; Navier-Stokes Equation ; Oxygen Enrichment ; Nitrogen Oxide Emission