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论文类型：期刊论文

发表时间：2008-07-01

发表刊物：JOURNAL OF THERMAL SCIENCE

收录刊物：SCIE、EI、Scopus

卷号：17

期号：3

页面范围：267-274

ISSN号：1003-2169

关键字：micronized coal reburning; NOx reduction; unburned carbon; numerical simulation; full-scale boiler

摘要：Three dimensional numerical simulation of bituminous coal reburning in a full-scale tangentially fired boiler was conducted with CFD method to study the effects of reburn zone length, the height of reburn nozzles, the stoichiometric ratio in reburn zone, the reburn fuel fraction and the reburn coal fineness on NOx reduction efficiency and unburned carbon in fly ash. The results indicate that the NOx reduction efficiency reaches the largest 14 value when the relative height of reburn nozzles is about 0.21 and the stoichiometric ratio is between 0.8 and 0.9 in reburn zone; NOx reduction efficiency increases with reburn zone length, reburn fuel fraction and the decrease of reburn coal particle size; the smaller the coal particle size is, the better the burnout performance of coal is.