CFD Modeling Study of High Temperature and Low Oxygen Content Exhaust Gases Combustion Furnaces

Document Type : Research Article

Authors

1 Graduate School of the Environment and Energy, Science and Research Branch, Islamic Azad University, P.O. Box 14155-4933 Tehran, I.R. IRAN

2 Faculty of Chemical Engineering, Tehran University, P.O. Box 11155-4563 Tehran, I.R. IRAN

3 CFD Research Center, Department of Chemical Engineering, Razi University, Kermanshah, I.R. IRAN

Abstract

This paper reports a CFD modeling study on the possibility of using high temperature and low oxygen content exhaust gases as oxidant for combustion in an industrial furnace by a written computer program. Under these conditions,the predicted results for the flow and heat transfer properties are compared with those under the several cases of conventional and highly preheated and diluted air combustion (HPDAC) conditions. Although the calculation procedure is a two dimensional one with the vorticity and stream function as the main hydrodynamic variables; its results can yet be also valid for the three dimensional case. Because of the weakness of the standard or other traditional k-ε models in predicting the spreading rate of axisymmetric jets, and also for the sake of economy and lack of boundary conditions, here the turbulent transport properties are obtained from an algebraic formula. An infinitely single-step chemical reaction (physically controlled) and a model known as “four flux” are considered as combustion and radiation models, respectively. The qualitative and quantitative verification of high temperature and low oxygen content air/exhaust gases combustions and conventional (low and high air temperature) combustions results have been checked and compared, respectively, with those reported in the literature. Finally, in this investigation three modified concepts and new formulas have been proposed and used to define the gas temperature uniformity, the chemical flame size and the maximum flame temperature as the HPDAC’S main unique features achievement criteria.

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References

[1] Hasegawa, T., Tanaka, R. and Niioka, T., Combustion with High Temperature Low Oxygen Air in Regenerative Burners, Presented at the First Asia-Pacific Conference on Combustion, Osaka, Japan,12-15 May, pp. 290-293 (1997). 
[2] Yasuda, T. and Ueno, C., Dissemination Project of Industrial Furnace Revamped with HTAC, Presented at the Second International Seminar on High Temperature Combustion in Industrial Furnace, Stockholm, Sweden, pp. 1-7(2000).
[3] Yang, W. and Blasiak, W., Combustion Performance and Numerical Simulation of a High Temperature Air-LPG Flame on a Regenerative Burner. Scand J Metallurgy, 33 (2), p. 113(2004).
[4] Ishii, T., Sugiyama, S. and Suzukawa, Y., Numerical Simulation of Temperature Distribution and NOX-Formation of Turbulent Diffusion Flame in High Temperature Air Combustion, Presented at the Japanese Flame Days 97, Osaka, Japan,16-17 May.(1997).
[5] Shimada, T., Uedo, M. and Imada, M., Computational Simulation of Regenerative Burner System and its Application to Walking Beam Furnace for Rolling Mill. Industrial Heating, 36 (2), 35(1999).
[6] Kobayashi, H. and Yoshikawa, K., Thermal Performance and Numerical Simulation of High Temperature Air Combustion Boiler, Proc. International Joint Power Generation Conference (IJPGC2000-15083), (2000).
[7] Dong, W. and Blasiak, W., Study on Mathematical Modeling of Highly Preheated Air Combustion, Presented at the Second High Temperature Air Combustion Symposium, Hsinchu, Taiwan. (1999).
[8] Yang, W. and Blasiak, W., Numerical Simulation of Properties of a LPG Flame with High Temperature Air. International journal of Thermal Sciences, 44 (10), p. 973(2005).
[9] Blasiak, W., Szewczyk, D. and Dobski, T., Influence of N2 Addition on Combustion of Single Jet of Methane in Highly Preheated Air, Proc. International Joint Power Generation Conference (IJPGC2001-19048), (2001).
[10] Yang, W. and Blasiak, W., Numerical Study of Fuel Temperature Influence on Single Gas Jet Combustion in Highly Preheated and Oxygen Deficient Air. Energy, 30(2-4), 385(2005).
[11] Lille, S., Blasiak, W. and Jewartowski, M., Experimental Study of the Fuel Jet Combustion in High Temperature and Low Oxygen Content Exhaust Gases, Energy, 30(2-4), p. 373(2005).
[12] Mortberg, M., Study Gas Fuel Jet Burning in Low Oxygen Content and High Temperature Oxidizer, PhD Thesis, Royal Institute of Technology, Stockholm, (2005).
[13] Abbasi Khazaei, K., Advanced Furnace Modeling and Simulation, Msc Thesis, Tarbiat Modaress University, Tehran, (1995).
[14] Truelove, J S., “Heat Exchanger Design Handbook”, Hemisphere Publishing Corporation, New York(1983).
[15] Launder, B E. and Spalding, D B., “Mathematical Models of Turbulence”, Academic Press, New York(1972). 
[16] Fluent5 Manual, Fluent Incorporation, (1998).
[17] Pun, W M. and Spalding, D B., A Procedure for Predicting the Velocity and Temperature Distributions in a Confined, Steady, Turbulent, Gaseous, Diffusion Flame, Proc. International Astronautical Federation Meeting, (1967).
[18] Khalil, E E., Spalding, D B. and Whitlaw, J H., The Calculation of Local Flow Properties in Two Dimensional Furnaces. International Journal of Heat and Mass Transfer, 18, p. 775(1975).
[19] Gosman, A D., Pun, W M., Runchal A K, Spalding D B and Wolfshetein M, “Heat and Mass Transfer in Recirculating Flow”,ImperialCollege,London(1969).
[20] Gosman, A D. and Lockwood, F C., Incorporation of Flux Model for Radiation into a Finite Difference Procedure for Furnace Calculation, Proc. 14th International Combustion Symposium, combustion Institute, p. 661(1972).
[21] Varga, R S., “Matrix iterative analysis”, Prentice-Hall International,London(1962).
[22] Nogay, R. and Prasad, A., Better Design Method for Fired Heaters, Hydrocarbon Processing, 64(11),
p. 91(1985).
[23] Ghia, K N., Torda, T P. and Lavan, Z., Turbulent Mixing in the Initial Region of Heterogeneous Axisymmetric Coaxial Confined Jets, Report No: NASA CR-1615, Illinois Institute of Technology,Chicago(1970).
[24] Hutchinson, P. and Khalil, E E., The Calculation of Furnace Flow Properties and Their Experimental Verification, Heat Transfer, 98(2), p. 276 (1976).
[25] Blasiak, W., Yang, W H. and Rafidi, N., Physical Properties of a LPG Flame with High Temperature Air on a Regenerative Burner, Combustion and Flame, 136(4), p. 567(2004).
[26] Yuan, J. and Naruse, I., Effects of Air Dilution on Highly Preheated Air Combustion in a Regenerative Furnace, Energy & Fuels, 13(1), p. 99 (1998).
[27] Rafidi, N., Thermodynamic Aspects and Heat Transfer Characteristics of HiTAC Furnaces with Regenerators, PhD Thesis, Royal Institute of Technology, Stockholm, (2005). 
[28] Morita, M., Optimal Design for High Performance Industrial Furnace Applied High Temperature Air Combustion Technology, Proc. International Joint Power Generation Conference (IJPGC2000-15030), (2000). 

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