O2/CO2 coal combustion characteristics in a 50 kWth circulating fluidized bed

被引：90
|
作者：
Duan, Lunbo [1 ]
Zhao, Changsui [1 ]
Zhou, Wu [1 ]
Qu, Chengrui [1 ]
Chen, Xiaoping [1 ]
机构：
[1] Southeast Univ, Thermoenergy Engn Res Inst, Nanjing 210096, Peoples R China
来源：
INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL | 2011年 / 5卷 / 04期
关键词：
O-2/CO2; combustion; Circulating fluidized bed; Combustion efficiency; Desulfurization efficiency; O-2; staging; OXY-FUEL COMBUSTION; CO2 PARTIAL PRESSURES; BITUMINOUS COAL; FLUE-GAS; PARTICLES; SULFATION; LIMESTONE; ATMOSPHERE; REDUCTION; NOX;
D O I：
10.1016/j.ijggc.2011.01.007
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Combustion experiments of two Chinese coals were conducted in a 50 kW(th) circulating fluidized bed (CFB) combustor in air and O-2/CO2 atmospheres, and the effects of atmosphere and O-2 staging on combustion characteristics including temperature distribution profiles, combustion efficiency, gaseous pollutant emission and desulfurization efficiency were investigated. Results show that O-2 enrichment in the atmosphere elevates the temperature level in the riser and improves the combustion efficiency. Without limestone addition, O-2 enrichment in the atmosphere augments SO2 and NO emission and reduces CO emission. The desulfurization efficiency under higher O-2 concentration is higher with the same Ca/S molar ratio in O-2/CO2 atmosphere. O-2 staging provides more operation flexibility for oxy-fuel CFB combustion. As O-2 concentration in the primary gas increases, combustion efficiency and desulfurization efficiency are improved. O-2 staging can reduce the NO emission to a large extent in O-2/CO2 atmosphere. (C) 2011 Elsevier Ltd. All rights reserved.
引用
收藏
页码：770 / 776
页数：7
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