Determining the Optimum Coal Concentration in A General Tangential-Fired Furnace with Rich-Lean Burners: From A Bench-Scale To A Pilot-Scale Study

doi:10.1016/j.applthermaleng.2014.08.015

	Determining the Optimum Coal Concentration in A General Tangential-Fired Furnace with Rich-Lean Burners: From A Bench-Scale To A Pilot-Scale Study
	Wang XB; Tan HZ; Yan WP; Wei XL(魏小林); Niu YQ; Hui SE; Xu TM; Tan, HZ (reprint author), Xi An Jiao Tong Univ, MOE Key Lab Thermo Fluid Sci & Engn, Xian 710049, Peoples R China.
发表期刊	APPLIED THERMAL ENGINEERING
	2014
卷号	73 期号:1 页码:371-379
ISSN	1359-4311
摘要	The mass ratio of pulverized coal and air (coal concentration, kg/kg) in fuel-rich streams is important in the design and operation of rich-lean burners, in which the optimum coal concentration (C-opt) that corresponds to the best combustion situation should be achieved. This study aims to establish a practical identification method to evaluate the C-opt of the different ranks of coal in rich-lean burners. A wide range of tests were conducted in a bench-scale down-fired furnace and a pilot-scale tangential-fired furnace with rich-lean burners. Temperature distribution, unburned carbon in ash, and NOx emissions were measured, and the effects of coal quality aside from burner type and burner layout method were considered. Results show that the optimum coal concentration corresponds to the highest furnace temperature for each group of tests both in the bench-scale and pilot-scale furnaces. C-opt is significantly affected by coal quality even if a change from the use of a corner-tangential to a wall-tangential furnace lowers C-opt; however, the effect of a vertical rich-lean burner or a horizontal rich-lean burner on C-opt is negligible. The value of C-opt mainly decreases from 1.14 to 0.67 with a decrease in the volatile content from anthracite scale (<0.1) to lignite scale (>0.35). The empirical formula of C-opt = 1.19-0.15V(daf)Q(net)(0.7)/100M(ad)(0.1) is obtained to evaluate the optimum coal concentration of a general pulverized coal flame, and another formula, C-opt = 1.18-0.17V(daf)Q(net)(0.7)/100M(ad)(0.1) is especially derived for a tangential-fired furnace with a rich-lean burner. The optimum value obtained is also critical to NOx emissions because when the coal concentration surpasses the value of C-opt, NOx emissions can be much more efficiently controlled through reduction of air. The findings of this study can provide practical guidance for the design and operation of rich-lean burners to achieve high combustion efficiency and low NOx emissions. (C) 2014 Elsevier Ltd. All rights reserved.
关键词	Coal Concentration Rich-lean Burner Tangential Combustion Ignition Nox Emissions
DOI	10.1016/j.applthermaleng.2014.08.015
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000346543400039
关键词[WOS]	COMBUSTION ; FUEL ; IGNITION ; AIR ; NOX
WOS研究方向	Thermodynamics ; Energy & Fuels ; Engineering ; Mechanics
WOS类目	Thermodynamics ; Energy & Fuels ; Engineering, Mechanical ; Mechanics
项目资助者	National Natural Science Foundation of China [51306142, 51376147]
课题组名称	LHD高效洁净燃烧(CPCR)
论文分区	一类
引用统计	被引频次：18[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/58573
专题	高温气体动力学国家重点实验室
通讯作者	Tan, HZ (reprint author), Xi An Jiao Tong Univ, MOE Key Lab Thermo Fluid Sci & Engn, Xian 710049, Peoples R China.
推荐引用方式 GB/T 7714	Wang XB,Tan HZ,Yan WP,et al. Determining the Optimum Coal Concentration in A General Tangential-Fired Furnace with Rich-Lean Burners: From A Bench-Scale To A Pilot-Scale Study[J]. APPLIED THERMAL ENGINEERING,2014,73,1,:371-379.
APA	Wang XB.,Tan HZ.,Yan WP.,魏小林.,Niu YQ.,...&Tan, HZ .(2014).Determining the Optimum Coal Concentration in A General Tangential-Fired Furnace with Rich-Lean Burners: From A Bench-Scale To A Pilot-Scale Study.APPLIED THERMAL ENGINEERING,73(1),371-379.
MLA	Wang XB,et al."Determining the Optimum Coal Concentration in A General Tangential-Fired Furnace with Rich-Lean Burners: From A Bench-Scale To A Pilot-Scale Study".APPLIED THERMAL ENGINEERING 73.1(2014):371-379.

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