NOx and N2O emission in bubbling fluidized-bed coal combustion with oxygen and recycled flue gas : Macroscopic characteristics of their formation and reduction
NOx and N2O emission in bubbling fluidized-bed coal combustion with oxygen and recycled flue gas : Macroscopic characteristics of their formation and reduction
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DOI：
10.1021/ef970075x
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发表时间：
1998-01
期刊：
影响因子：
5.3
通讯作者：
H. Hosoda;T. Hirama;Naohiro Azuma;K. Kuramoto;J. Hayashi;T. Chiba
中科院分区：
文献类型：
--
作者：
H. Hosoda;T. Hirama;Naohiro Azuma;K. Kuramoto;J. Hayashi;T. Chiba
以常压鼓泡流化床为实验对象，研究了烟气循环利用对煤燃烧过程中氮氧化物排放的抑制作用。将澳大利亚烟煤压碎至小于5mm，在直径0.158 m，高度3 m的燃烧室中，以1120 K和1.0 m/s的表面气速进行燃烧。燃烧以两种不同的模式进行，即出口气体回收模式（ERM），其中富含二氧化碳的烟气被回收并与纯O2一起送入燃烧室，以及一次通过模式（OTM），其中具有各种成分的气体以及空气被送入燃烧室而不进行回收。在进口O2浓度为21 vol %的ERM中，燃料氮转化为NOx和N2O的总分数分别为0.0083和0.012，分别相当于有空气的OTM的约1/9和1/6。在OTM中，研究了不同进口N2、CO2和H2O浓度(CN2（i)、CCO2（…））下进口气体组成对NOx和N2O排放的影响。
Suppression of nitrogen oxides emission by flue gas recycling was experimentally examined for coal combustion in an atmospheric bubbling fluidized bed. An Australian bituminous coal crushed to sizes smaller than 5 mm was burnt at 1120 K and superficial gas velocity of 1.0 m/s in a 0.158 m i.d. and 3 m high combustor. The combustion was performed in two different modes, namely, an exit gas recycling mode (ERM) where CO2-rich flue gas was recycled and fed to the combustor with pure O2 and a once-through mode (OTM) where gas with various compositions as well as air was fed to the combustor without the recycling. In ERM with the inlet concentration of O2 being kept at 21 vol %, the overall fractional conversions of fuel nitrogen into NOx and N2O were 0.0083 and 0.012, respectively, which were respectively equivalent to about 1/9 and 1/6 of those in OTM with air. In OTM, the effect of the inlet gas composition on NOx and N2O emissions was examined at various inlet N2, CO2, and H2O concentrations (CN2(i), CCO2(...