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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.
Source PublicationAPPLIED THERMAL ENGINEERING
2014
Volume73Issue:1Pages:371-379
ISSN1359-4311
AbstractThe 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.
KeywordCoal Concentration Rich-lean Burner Tangential Combustion Ignition Nox Emissions
DOI10.1016/j.applthermaleng.2014.08.015
Indexed BySCI ; EI
Language英语
WOS IDWOS:000346543400039
WOS KeywordCOMBUSTION ; FUEL ; IGNITION ; AIR ; NOX
WOS Research AreaThermodynamics ; Energy & Fuels ; Engineering ; Mechanics
WOS SubjectThermodynamics ; Energy & Fuels ; Engineering, Mechanical ; Mechanics
Funding OrganizationNational Natural Science Foundation of China [51306142, 51376147]
DepartmentLHD高效洁净燃烧(CPCR)
Classification一类
Citation statistics
Cited Times:6[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/58573
Collection高温气体动力学国家重点实验室
Corresponding AuthorTan, HZ (reprint author), Xi An Jiao Tong Univ, MOE Key Lab Thermo Fluid Sci & Engn, Xian 710049, Peoples R China.
Recommended Citation
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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