Commenced in January 2007
Frequency: Monthly
Edition: International
Paper Count: 30576
Numerical Study of Oxygen Enrichment on NO Pollution Spread in a Combustion Chamber

Authors: Zohreh Orshesh

Abstract:

In this study, a 3D combustion chamber was simulated using FLUENT 6.32. Aim to obtain detailed information on combustion characteristics and _ nitrogen oxides in the furnace and the effect of oxygen enrichment in a combustion process. Oxygenenriched combustion is an effective way to reduce emissions. This paper analyzes NO emission, including thermal NO and prompt NO. Flow rate ratio of air to fuel is varied as 1.3, 3.2 and 5.1 and the oxygen enriched flow rates are 28, 54 and 68 lit/min. The 3D Reynolds Averaged Navier Stokes (RANS) equations with standard k-ε turbulence model are solved together by Fluent 6.32 software. First order upwind scheme is used to model governing equations and the SIMPLE algorithm is used as pressure velocity coupling. Results show that for AF=1.3, increase the oxygen flow rate of oxygen reduction in NO emissions is Lance. Moreover, in a fixed oxygen enrichment condition, increasing the air to fuel ratio will increase the temperature peak, but not the NO emission rate. As a result, oxygen enrichment can reduce the NO emission at this kind of furnace in low air to fuel rates.

Keywords: Combustion Chamber, NO emission, oxygen enrichment, Reynolds Averaged Navier- Stokes

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1056030

Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 1286

References:


[1] Y. Khazraii, K. Daneshvar, H. PoorkhademNamin, "Numerical Simulation on Nox Emission in Liquid Fuel Spray Flames," Journal of Modeling and Optimization, International, Vol. 1, No. 4, October 2011.
[2] Energy Center of Wisconsin, "Oxygen-Enriched Combustion Technologies," fact sheet, 0300/7370, Publication number 1-426, 2000.
[3] Industrial Technologies Program Energy Efficiency and Renewable Energy U.S.," Energy Tips - Process Heating," Department of Energy Washington, DC 20585-0121, Tip Sheet #3 www.eere.energy.gov/industry, September 2005.
[4] A. Frassoldati, S. Firgerio, E. Colombo, F. Inzoli and T. Faravelli, "Determination of Nox Emissions from Strong Swirling Confined Flames with an Integrated Cfd-Based Procedure," Chem. Eng. Sci., Vol. 60. No. 11, 2851-2869, June 2005.
[5] Hamzeh Jafar Karimi, Mohammad Hassan Saidi, "Heat Transfer and Energy Analysis of a Pusher Type Reheating Furnace Using Oxygen Enhanced Air for Combustion," Journal of Iron and Steel Research, International, Vol. 17, Issue 4, April 2010, Pages 12-17.
[6] S.S. Daood, W. Nimmo, P. Edge, B.M. Gibbs, "Deep-staged oxygen enriched combustion of coal," Fuel, Available online 17 February 2011.
[7] L. Álvarez, M. Gharebaghi, J.M. Jones, M. Pourkashanian, A. Williams, J. Riaza, C. Pevida, J.J. Pis, F. Rubiera, " numerical investigation of NO emission from an entrained flow reactor under oxy-coal conditions, "Fuel Processing Technology, Volume 93, Issue 1, January 2012, Pages 53-64.
[8] Fluent Inc., Fluent 6.3 User's Guide, 2007.
[9] B.E. Launder and D.B. Spalding, "The Numerical Computation Of Turbulent Flows," Comp. Meth. Appl. Mech. Eng., Vol. 3, No. 2, 269- 289, March 1974.
[10] D.L. Baulch, D.D. Drysdall and D.G. Horne, "Evaluated Kinetic Data For High Temperature Reactions," Butterworth, 1973.
[11] M. Darbandi, A. Banaeizadeh and G. E. Schneider, "Implicit Finite Volume Method to Simulate Reacting Flow" 43rd AIAA Aerospace Sciences Meeting and Exhibit, Reno, Nevada, 10-13 Jan, 2005.
[12] Elkaim, D., Reggio, M., and Camarero, R., "Control Volume Finite- Element Solution of A Confined Turbulent Diffusion Flame," Numerical Heat Transfer, Vol. 23, 1993, pp.259-279.
[13] Smoot, J.L, and Lewis, H.M., "Turbulent Gaseous Combustion: Part 1, Local Species Concentration Measurements," Combustion and Flame, Vol. 42, 1981, pp.183-196.