International Scientific Journal

Authors of this Paper

External Links


Tangentially fired furnaces are vortex combustion units which have become more attractive in the field of power station firing systems in recent years. Although the application of tangentially fired furnace continuously increases, they have not yet been adequately investigated. The present work provides a numerical study of flow pattern and its effect on NOx emission in a single chamber square tangentially fired furnace. Details of the flow field, along with temperature and species concentration contour maps are obtained from the solution of the conservation equations of mass, momentum, and energy, and transport equations for scalar variables in addition to the equations of the turbulence model. Four cases with different inlet air velocities are studied. Combustion in a natural gas-fired horizontal furnace with circular cross-section is simulated to verify the simulation methodology and the solution algorithm. Results are compared with those of the existing references and good agreement is observed. Calculations for the tangentially fired furnace show that while the vortex created in the center of the furnace becomes stronger as the burner outlet air velocity increases, its size remains almost unchanged. Highest-temperature regions are favorably far from the furnace walls so that erosion and local over-heating can be minimized. According to the results, higher inlet air velocities lead to more uniform temperature distributions with lower peak temperatures, which in turn result in remarkable reduction of NOx emission of the furnace.
PAPER REVISED: 2009-11-02
PAPER ACCEPTED: 2009-12-18
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2010, VOLUME 14, ISSUE Issue 2, PAGES [493 - 503]
  1. Tong, Zh., et al., Numerical Study of the Effect of Imaginary Circle Diameter and Initial Flow Field on the Aerodynamic Field in a Tangentially Fired Furnace, J. of Thermal Science, 6 (1997), 2, pp. 149-154
  2. Tong, Zh., et al., Study on the Effect of the Side Secondary Air Velocity on the Aerodynamic Field in a Tangentially Fired Furnace with HBC-SSA Burner, J. of Thermal Science, 8 (1999), 4, pp. 277-283
  3. Zhou, N., Xu, Q., Zhou, P., Two-Stage Numerical Simulation for Temperature Profile in Furnace of Tangentially Fired Pulverized Coal Boiler, J. Cent. South Univ. Technol., 12 (2005), 1, pp. 97-101
  4. Zhou, P., Mei, Ch., Gong, G., Computational Study on Furnace Process in a Multi-Burner Boiler of Pulverized Coal Fired Tangentially at Four Corners, J. Cent. South Univ. Technol., 7 (2000), 3, pp. 152-155
  5. El-Mahallawy, F., El-Din Habik, S., Fundamentals and Technology of Combustion, Elsevier, Amsterdam, Boston, 2002
  6. Habib, M. A., Ben-Mansour, R., Antar, M. A., Flow Field and Thermal Characteristics in a Model of a Tangentially Fired Furnace under Different Conditions of Burner Tripping, Heat Mass Transfer, 41 (2005), 10, pp. 909-920
  7. Li, S., et al., Comparison of NOx Emission Reductions with Exclusive SOFA and CCOFA on Tangentially-fired Boilers, Proceedings, International Conference on Power Engineering, Hangzhou, China, 2007, pp. 805-809
  8. Zhou, Y., et al., Experimental and Numerical Study on the Flow Fields in Upper Furnace for Large Scale Tangentially Fired Boilers, Applied Thermal Engineering, 29 (2009), 4, pp. 732-739
  9. ***, Fluent 6.2 User's Guide, Fluent Inc., Lebanon, NH 03766, USA, 2005
  10. Blasiak, W., Fakhrai, R., Residence Time and Mixing Control in the Upper Furnace of Boilers and Incinerators, Proceedings, IT3'02 Conference, New Orleans, La., USA, 2002, pp. 1-10
  11. Bakker, A., Turbulence Models,
  12. Khalilarya, S., Pourmahmod, N., Lotfiani, A., Evaluation of Two-Equation Turbulence Models for Simulation of Gaseous Round Jets (in Farsi), Proceedings, MEC 2009, Mashad, Iran, 2009, pp. 210-211
  13. Han, X., et al., Detailed Modeling of Hybrid Reburn/SNCR Processes for NOx Reduction in Coal-Fired Furnaces, Combustion and Flame, 132 (2003), 3, pp. 374-386
  14. Maloney, K., et al., Computational Fluid Dynamic Modeling and Field Results for Co-Firing Gas over Coal in a Stoker Boiler, Proceedings, International Conference on Power Engineering, Hangzhou, China, 2007, pp. 886-892
  15. Pathak, M., Dewan, A., Dass, A. K., Computational Prediction of a Slightly Heated Turbulent Rectangular Jet Discharged into a Narrow Channel Crossflow Using Two Different Turbulence Models, International Journal of Heat and Mass Transfer, 49 (2006), 21-22, pp. 3914-3928
  16. Kontogeorgos, D. A., Keramida, E. P., Founti, M. A., Assessment of Simplified Thermal Radiation Models for Engineering Calculations in Natural Gas-fired Furnace, International Journal of Heat and Mass Transfer, 50 (2007), 25-26, pp. 5260-5268
  17. Cumber, P. S., Fairweather, M., Evaluation of Flame Emission Models Combined with the Discrete Transfer Method for Combustion System Simulation, International Journal of Heat and Mass Transfer, 48 (2005), 25-26, pp. 5221-5239
  18. Kumar, S., Paul, P. J., Mukunda, H. S., Prediction of Flame Liftoff Height of Diffusion/Partially Premixed Jet Flames and Modeling of Mild Combustion Burners, Combust. Sci. and Tech., 179 (2007), 10, pp. 2219-2253

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence