Abstract
A grate-firing boiler was developed for wood pellet fuel, and then its combustion characteristics were tested. The flame was stretched to the exit of the combustion chamber, implying insufficient space for complete combustion. As a first step to resolve this problem, a numerical simulation was conducted for the combustion chamber. Turbulent and chemically reacting flow was considered by implementing a homogeneous reaction model. Flow field from the simulation showed strong recirculation flow at the upstream corner of the chamber, along which the flame was stretched to the exit. Based on these results, we suggest possible modification of the combustion chamber to improve combustion characteristics, such as relocating its exit or installing internals like guide vanes.
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References
T. Klason and X. S. Bai, Computational study of the combustion process and NO formation in a small-scale wood pellet furnace, Fuel, 86 (2007) 1465–1474.
C. Yin, L. A. Rosendahl and S. K. Kaer, Grate-firing of biomass for heat and power production, Progr. Energy Combust. Sci., 34 (2008) 725–754.
C. D. Blasi, Modeling chemical and physical processes of wood and biomass pyrolysis, Progr. Energy Combust. Sci., 34 (2008) 47–90.
F. Fiedler, The state of the art of small-scale pellet-based heating systems and relevant regulations in Sweden, Austria and Germany, Renewable Sustainable Energy Rev., 8 (2004) 3624–3629.
R. Saidur, E. A. Abdelaziz, A. Demidras, M. S. Hossain and S. Mekhilef, A review on biomass as a fuel for boilers, Renewable Sustainable Energy Rev., 15 (2011) 2262–2289.
A. Demidras, Potential application of renewable energy sources, biomass combustion problems in boiler power systems and combustion related environmental issues, Progr. Energy Combust. Sci., 31 (2005) 171–192.
D. Djurovic, S. Nemoda, D. Dakic, M. Adzic and B. Repic, Furnace for biomass combustion — Comparison of model with experimental data, Int. J. Heat Mass Transf., 55 (2012) 4312–4317.
B. F. Magnusen and B. H. Hjertager, On mathematical modeling of turbulent combustion with special emphasis on soot formation and combustion, Proc. Combust. Inst., 16 (1976) 719–729.
R. Vijeu, R. L. Gerun, M. Tazerout, C. Castelain and J. Bellettre, Dimensional modeling of wood pyrolysis using a nodal approach, Fuel, 87 (2008) 3292–3303.
V. Novozhilov, B. Moghtaderi, D. F. Fletcher and J. H. Fi Kent, Computational fluid dynamics modeling of wood combustion, Fire Safety J., 27 (1996) 69–84.
M. J. Spearpoint and J. G. Quintiere, Predicting the burning of wood using an integral model, Combust. Flame, 123(3) (2000) 308–325.
S. K. Kaer, Numerical modeling of a straw-fired grate boiler, Fuel, 83 (2004) 1183–1190.
S. B. Kang, J. J. Kim, K. S. Choi, B. S. Sim and H. Y. Oh, Development of a test facility to evaluate performance of a domestic wood pellet boiler, Renewable Energy, 54 (2013) 2–7.
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Recommended by Editor Oh Chae Kwon
J. Ahn received his B.S. (1997), M.S. (1999), and Ph.D. (2003) degrees from Seoul National University, Korea. He worked as a senior researcher in KIER (2006–2010), and is now a professor in Kookmin University. His research interests include heat transfer and combustion problems in energy systems.
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Ahn, J., Kim, J.J. Combustion and heat transfer characteristics inside the combustion chamber of a wood pellet boiler. J Mech Sci Technol 28, 789–795 (2014). https://doi.org/10.1007/s12206-013-1145-0
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DOI: https://doi.org/10.1007/s12206-013-1145-0