Abstract
By increasing the injection velocity to 112 m/s, the coal MILD combustion is established in both experiment and simulation without high-temperature preheating. The simulation can predict the temperature distribution and the species concentration field well, except that at the area near the burner. An experiment of swirl flame combustion is also applied as a reference. The main conclusion is that in the coal MILD combustion, the reaction zone is dispersed across the furnace like flamlete in which the reaction rate is relatively high, and an integration of dark spark appears. The combustion temperature in the MILD combustion was much lower than that in the swirl flame combustion at the centerline; the rate of temperature decrement in the MILD combustion is also slower than that in swirl flame combustion along the centerline, as the reaction is dispersed across the furnace in the MILD combustion and concentrated at a certain region in the swirl flame combustion. At the lower part of the furnace, the oxygen concentration is almost uniform and lower than 6 vol.% except that at near the axis of the high-velocity nozzle.
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References
Cavaliere A, de Joannon M (2004) MILD combustion. Prog Energy Combust Sci 30(4):329–366
Sabia P, de Joannon M, Lavadera M, Giudicianni P, Ragucci R (2014) Autoignition delay times of propane mixtures under MILD conditions at atmospheric pressure. Combust Flame 161:3022–3030
Katsuki M, Hasegawa T (1998) The science and technology of combustion in highly preheated air. Proc Combust Inst 27(2):3135–3146
Tsuji H, Gupta A, Hasegawa T et al (2003) High temperature air combustion: from energy conservation to pollution reduction. CRC Press, Florida
Li P, Mi J, Dally B, Wang F, Wang L, Liu Z, Cheng S, Zheng C (2011) Progress and recent trend in MILD combustion. Sci China-Technol Sci 2(54):255–269
Weber R, Smart J, Vd Kamp W (2005) On the MILD combustion of gaseous, liquid, and solid fuels in high temperature preheated air. Proc Combust Inst 30:2623–2629
Liu H, Chao Y, Dong S, Yuan X, Zeng Z, Ando T, Okazaki K (2013) Efficient Desulfurization in a new scheme of oxyfuel combined with partial CO2 removal from recycled gas and MILD combustion. Energy Fuels 27:1513–1521
Li P, Dally B, Mi J, Wang F (2013) MILD oxy-combustion of gaseous fuels in a laboratory-scale furnace. Combust Flame 160:933–946
Saha M, Dally B, Medwell P, Cleary E (2014) Moderate or intense low oxygen dilution (MILD) combustion characteristics of pulverized coal in a self-recuperative furnace. Energy Fuels 28:6046–6057
Stadler H, Toporov D, Förster M (2009) On the influence of the char gasification reactions on NO formation in flameless coal combustion. Combust Flame 156:1755–1763
Stadler H, Ristic D, Förster M, Schuster A, Kneer K, Scheffknecht G (2009) NOx-emissions from flameless coal combustion in air Ar=O2 and CO2=O2. Proc Combust Inst 32:3131–3138
Shaw D, Zhu X, Misra M, Essenhigh R (1991) Determination of global kinetics of coal volatiles combustion. Proc Combust Inst 1155–1162
Howard J, Williams G, Fine D (1973) Kinetics of carbon monoxide oxidation in post flame gases. Proc Combust Inst 14(1):975–986
Jones W, Lindstedt R (1988) Global reaction schemes for hydrocarbon combustion. Combust Flame 73(3):233–249
Hautman D, Dryer F, Schug K, Glassman I (1981) Multiple-step overall kinetic mechanism for the oxidation of hydrocarbon. Combust Sci Technol 25(5):219–235
Field M (1970) Measurements of the effect of rank on combustion rates of pulverized coal. Combust Flame 14(2):237–248
Smoot D, Pratt D (1979) Pulverized-coal combustion and gasification: theory and applications for continuous flow processes. Plenum Press, New York
Minamoto Y, Swaminathan N (2014) Scalar gradient behaviour in MILD combustion. Combust Flame 161:1063–1075
Acknowledgments
The authors are grateful to the National Basic Research Program of China (2011CB707301) and the Specialized Research Fund for the Doctoral Program of Higher Education (20130142130009) for the financial support.
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Mao, Z., Zhang, L., Zhu, X., Zheng, C. (2016). Experimental Study of Coal MILD Combustion at a Pilot-Scale Furnace. In: Yue, G., Li, S. (eds) Clean Coal Technology and Sustainable Development. ISCC 2015. Springer, Singapore. https://doi.org/10.1007/978-981-10-2023-0_23
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DOI: https://doi.org/10.1007/978-981-10-2023-0_23
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