With the objective of producing a full-scale tiny-oil ignition burner, identical to the burner used in an 800 MWe utility boiler, numerical simulations were performed using Fluent 6.3.26 to study the progress of ignition for four coal concentration settings covering sub-operation conditions prevailing during the experiments performed with the burner. The numerical simulations conformed to the experimental results, demonstrating the suitability of the model used in the calculations. Simulations for a coal concentration of 0.40 kg/kg corresponding to a single burner operating at its rated output were also conducted, which indicated that gas temperatures along the burner centerline were high. As gas flowed to the burner nozzle, the high-temperature region expanded, ensuring a successful pulverized-coal ignition. With increasing coal concentration (0.08–0.40 kg/kg), the gas temperature along the burner centerline and at the first and second combustion chamber exits decreased at the equivalent radial points. At the center of the second combustion chamber exit, the O2 concentrations were almost depleted for the five coal concentrations, while the CO concentrations peaked.
Corresponding Author(s):
LI Zhengqi,Email:green@hit.edu.cn
引用本文:
. Numerical simulation of combustion characteristics at different coal concentrations in bituminous coal ignition in a tiny-oil ignition burner[J]. Frontiers in Energy, 2013, 7(2): 255-262.
Chunlong LIU, Qunyi ZHU, Zhengqi LI, Qiudong ZONG, Yiquan XIE, Lingyan ZENG. Numerical simulation of combustion characteristics at different coal concentrations in bituminous coal ignition in a tiny-oil ignition burner. Front Energ, 2013, 7(2): 255-262.
Dai D, Liu J. Tackling global electricity shortage through human power: Technical opportunities from direct or indirect utilizations of the pervasive and green human energy. Frontiers in Energy , 2012, 6(3): 210–226 doi: 10.1007/s11708-012-0200-3
2
Chen G F, Zheng X J, Cong L. Energy efficiency and carbon dioxide emissions reduction opportunities in district heating source in Tianjin. Frontiers in Energy , 2012, 6(3): 285–295 doi: 10.1007/s11708-012-0197-7
3
Franco A, Diaz A R. The future challenges for ‘‘clean coal technologies’’: Joining efficiency increase and pollutant emission control. Energy , 2009, 34(3): 348–354 doi: 10.1016/j.energy.2008.09.012
4
You C F, Xu X C. Coal combustion and its pollution control in China. Energy , 2010, 35(11): 4467–4472 doi: 10.1016/j.energy.2009.04.019
5
Liszka M, Ziebik A. Coal-fired oxy-fuel power unit- Process and system analysis. Energy , 2010, 35(2): 943–951 doi: 10.1016/j.energy.2009.07.007
6
Schaffel-Mancini N, Mancini M, Szlek A, Weber R. Novel conceptual design of a supercritical pulverized coal boiler utilizing high temperature air combustion (HTAC) technology. Energy , 2010, 35(7): 2752–2760 doi: 10.1016/j.energy.2010.02.014
7
Fan W D, Li Y Y, Lin Z C, Zhang M C. PDA research on a novel pulverized coal combustion technology for a large utility boiler. Energy , 2010, 35(5): 2141–2148 doi: 10.1016/j.energy.2010.01.033
8
Liu C L, Li Z Q, Zhao Y, Chen Z C. Influence of coal-feed rates on bituminous coal ignition in a full-scale tiny-oil ignition burner. Fuel , 2010, 89(7): 1690–1694 doi: 10.1016/j.fuel.2009.08.008
9
Li Z Q, Liu C L, Zhao Y, Chen Z C. Influence of the coal-feed rate on lean coal ignition in a full-scale tiny-oil ignition burner. Energy & Fuels , 2010, 24(1): 375–378 doi: 10.1021/ef900859q
10
Sheng C, Moghtaderi B, Gupta R, Wall T F. A computational fluid dynamics based study of the combustion characteristic of coal blends in pulverized coal-fired furnace. Fuel , 2004, 83(11,12): 1543-1552
11
Backreedy R I, Jones J M, Ma L, Pourkashanian M, Williams A, Arenillas A, Arias B, Pis J J, Rubiera F. Prediction of unburned carbon and NOx in a tangentially fired power station using single coals and blends. Fuel , 2005, 84(17): 2196–2203 doi: 10.1016/j.fuel.2005.05.022
12
Saario A, Oksanen A. Comparison of global ammonia chemistry mechanisms in biomass combustion and selective noncatalytic reduction process conditions. Energy & Fuels , 2008, 22(1): 297–305 doi: 10.1021/ef700238a
13
Yin C, Rosendahl L, K?r S, Clausen S, Hvid S L, Hille T. Mathematical modeling and experimental study of biomass combustion in a thermal 108 MW grate-fired boiler. Energy & Fuels , 2008, 22(2): 1380–1390 doi: 10.1021/ef700689r
14
Shih T H, Liou W W, Shabbir A, Shabbir A, Yang Z G, Zhu J. A new k-? eddy viscosity model for high reynolds number turbulent flows-model development and validation. Computers & Fluids , 1995, 24(3): 227–238 doi: 10.1016/0045-7930(94)00032-T
15
Gosman A D, Loannides E. Aspects of computer simulation of liquid-fuelled combustors. In: AIAA 19th Aerospace Science Meeting , St Louis, USA, 1981, Paper No. AIAA-81-0323
16
Cheng P. Two-dimensional radiation gas flow by a moment method. AIAA Journal , 1964, 2(9): 1662–1664 doi: 10.2514/3.2645
17
Smoot L D, Smith P J. Coal Combustion and Gasification. New York: Plenum Press, 1985
18
Spalding D B. Combustion and Mass Transfer. New York: Pergamon Press, 1979
19
Zhou L X. Theory and Numerical Modeling of Turbulent Gas-Particle Flows and Combustion. Boca Raton: CRC Press, 1993