Numerical simulation of bituminous coal combustion in a full-scale tiny-oil ignition burner: influence of excess air ratio

doi:10.1007/s11708-012-0191-0

Front Energ

2012, Vol. 6

Issue (3) : 296-303 https://doi.org/10.1007/s11708-012-0191-0

RESEARCH ARTICLE

Numerical simulation of bituminous coal combustion in a full-scale tiny-oil ignition burner: influence of excess air ratio

Zhengqi LI(

), Chunlong LIU, Xiang ZHANG, Lingyan ZENG, Zhichao CHEN

School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China

Download: PDF(529 KB) HTML
Export: BibTeX | EndNote | Reference Manager | ProCite | RefWorks

Abstract

The progression of ignition was numerically simulated with the aim of realizing a full-scale tiny-oil ignition burner that is identical to the burner used in an 800 MWe utility boiler. The numerical simulations were conducted for four excess air ratios, 0.56, 0.75, 0.98 and 1.14 (corresponding to primary air velocities of 17, 23, 30 and 35 m/s, respectively), which were chosen because they had been used previously in practical experiments. The numerical simulations agreed well with the experimental results, which demonstrate the suitability of the model used in the calculations. The gas temperatures were high along the center line of the burner for the four excess air ratios. The flame spread to the burner wall and the high-temperature region was enlarged in the radial direction along the primary air flow direction. The O₂ concentrations for the four excess air ratios were 0.5%, 1.1%, 0.9% and 3.0% at the exit of the second combustion chamber. The CO peak concentration was very high with values of 7.9%, 9.9%, 11.3% and 10.6% for the four excess air ratios at the exit of the second combustion chamber.

Keywords numerical simulation tiny-oil ignition burner pulverized coal temperature field

Corresponding Author(s): LI Zhengqi,Email:green@hit.edu.cn

Issue Date: 05 September 2012

Cite this article:

Chunlong LIU,Xiang ZHANG,Lingyan ZENG, et al. Numerical simulation of bituminous coal combustion in a full-scale tiny-oil ignition burner: influence of excess air ratio[J]. Front Energ, 2012, 6(3): 296-303.

URL:

https://academic.hep.com.cn/fie/EN/10.1007/s11708-012-0191-0
https://academic.hep.com.cn/fie/EN/Y2012/V6/I3/296

Fig.1 Experimental setup

Fig.2 Three-dimensional mesh generation

Tab.1 List of the parameters used in this study

Tab.2 Ultimate analysis results and other characteristics of 0# light diesel oil

Tab.3 Characteristics of the bituminous pulverized coal used

Fig.3 Comparison of calculated temperature with measured temperature on the center line of the burner for different excess air ratios

Fig.4 Maximum temperatures at various sections along the flow direction of the primary air and the radial positions of the maximum temperatures for different excess air ratios

Fig.5 Gas temperature (°C) distributions in the burner at an excess air ratio of 0.75

Fig.6 Comparison of calculated temperature with measured temperature at the exits of the first and second combustion chambers for different excess air ratios

Fig.7 Comparison of calculated O concentration distribution along the radial direction at the exits of the first and second combustion chambers and measured O concentration at the exits of the second combustion chambers for different excess air ratios

Fig.8 CO concentration distribution along the radial direction at the exit of the second combustion chamber for different excess air ratios

1	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
2	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
3	Liu C L, Li Z Q, Kong W G, Zhao Y, Chen Z C. Influence of the excess air ratio on bituminous coal combustion in a full-scale start-up ignition burner. Energy , 2010, 35(10): 4102-4106 doi: 10.1016/j.energy.2010.06.023
4	Li Z Q, Liu C L, Zhu Q Y, Kong W G, Zhao Y, Chen Z C. Experimental studies on the effect of the pulverized coal concentration on lean-coal combustion in a lateral-ignition tiny-oil burner. Energy & Fuels , 2010, 24(8): 4161-4165 doi: 10.1021/ef100728f
5	Zeng L Y, Li Z Q, Cui H, Zhang F C, Chen Z C, Zhao G B. Effect of the fuel bias distribution in the primary air nozzle on the slagging near a swirl coal burner throat. Energy & Fuels , 2009, 23(10): 4893-4899 doi: 10.1021/ef900363q
6	Vuthaluru H B, Vuthaluru R. Control of ash related problems in a large scale tangentially fired boiler using CFD modeling. Applied Energy , 2010, 87(4): 1418-1426 doi: 10.1016/j.apenergy.2009.08.028
7	Li Z Q, Jing J P, Ge Z H, Liu G K, Chen Z C, Ren F. Numerical simulation of low NO_x combustion technology in a 100 MWe bituminous coal-fired wall boiler. Numerical Heat Transfer. Part A: Applications , 2009, 55(6): 574-593 doi: 10.1080/10407780902821227
8	Diez L I, Cortes C, Pallares J. Numerical investigation of NO_x emissions from a tangentially-fired utility boiler under conventional and overfire air operation. Fuel , 2008, 87(7): 1259-1269 doi: 10.1016/j.fuel.2007.07.025
9	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
10	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 NO_x 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
11	Li L M, Chen L Z, Sun R, Li B Y, Li W B, Guo A G, Diao Y F. Numerical simulation and industrial application of combustion process of horizontal bias less-oil ignited pulverized-coal burner. Electric Power Construction , 2008, 29(8): 7-12
12	Li X M, Yao L, Li C T. Numerical simulation of ignition with less oil in abundant oxygen. Power System Engineering , 2008, 24(1): 19-23
13	Fu Z G, Wang Z P, Shi L L. Numerical simulation of the tiny-oil ignition burner in the coal fired boiler. Journal of Engineering Thermophysics , 2008, 29(4): 609-612 (in Chinese)
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. Journal of Energy , 1983, 7(6): 482-490 doi: 10.2514/3.62687
16	Cheng P. Two-dimensional radiation gas flow by a moment method. AIAA Journal , 1964, 2(3): 1662-1664
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. England: CRC Press, 1993

[1]	Bojie WANG, Wen WANG, Chao QI, Yiwu KUANG, Jiawei XU. Simulation of performance of intermediate fluid vaporizer under wide operation conditions[J]. Front. Energy, 2020, 14(3): 452-462.
[2]	Chongzhe ZOU, Huayi FENG, Yanping ZHANG, Quentin FALCOZ, Cheng ZHANG, Wei GAO. Geometric optimization model for the solar cavity receiver with helical pipe at different solar radiation[J]. Front. Energy, 2019, 13(2): 284-295.
[3]	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[J]. Front Energ, 2013, 7(2): 255-262.
[4]	Youmin HOU, Danmei XIE, Wangfan LI, Xinggang YU, Yang SHI, Hanshi QIN. Numerical simulation of a new hollow stationary dehumidity blade in last stage of steam turbine[J]. Front Energ, 2011, 5(3): 288-296.
[5]	Lei GUO, Shusheng ZHANG, Lin CHENG. Nucleate boiling in two types of vertical narrow channels[J]. Front Energ, 2011, 5(3): 250-256.
[6]	Jinrong ZHU, Suyi HUANG, Wei LV, Huaichun ZHOU. Study on the measurement of temperature field using laser holographic interferometry[J]. Front Energ, 2011, 5(1): 120-124.
[7]	Liansuo AN , Zhi WANG , Zhonghe HAN , . Numerical study and control method of interaction of nucleation and boundary layer separation in condensing flow[J]. Front. Energy, 2009, 3(3): 254-261.
[8]	Jie WANG, Zuohua HUANG, Bing LIU, Xibin WANG. Simulation of combustion in spark-ignition engine fuelled with natural gas-hydrogen blends combined with EGR[J]. Front Energ Power Eng Chin, 2009, 3(2): 204-211.
[9]	Lin ZUO, Lixia SUN, Changfu YOU. Latest progress in numerical simulations on multiphase flow and thermodynamics in production of natural gas from gas hydrate reservoir[J]. Front Energ Power Eng Chin, 2009, 3(2): 152-159.
[10]	LI Jingyin, TIAN Hua, YUAN Xiaofang. Effect of inlet box on performance of axial flow fans[J]. Front. Energy, 2008, 2(4): 390-394.
[11]	LI Jianfeng, LU Junfu, ZHANG Hai, LIU Qing, YUE Guangxi. Numerical simulation of air flow field in high-pressure fan with splitter blades[J]. Front. Energy, 2008, 2(4): 438-442.
[12]	YIN Jie, WEI Dunsong, YIN Jie, REN Jianxing. NO control in large-scale power plant boilers through superfine pulverized coal technology[J]. Front. Energy, 2008, 2(4): 461-465.
[13]	JIANG Jian, LIU Bo, WANG Yangang, NAN Xiangyi. Numerical simulation of three-dimensional turbulent flow in multistage axial compressor blade row[J]. Front. Energy, 2008, 2(3): 320-325.
[14]	WANG Changhong, ZHU Dongsheng, LEI Junxi, ZHOU Jiemin. Numerical investigation on side heat transfer enhancement in 300 kA aluminum reduction cell[J]. Front. Energy, 2008, 2(3): 256-260.
[15]	LI Chunxi, WANG Songling. Investigation of flow dynamics and decrease of vortex noise inside volute of centrifugal fans[J]. Front. Energy, 2008, 2(2): 235-240.

Viewed

Full text

Abstract

Cited

Shared

Discussed