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Indexed by:期刊论文

Date of Publication:2008-07-01

Journal:JOURNAL OF THERMAL SCIENCE

Included Journals:SCIE、EI、Scopus

Volume:17

Issue:3

Page Number:267-274

ISSN No.:1003-2169

Key Words:micronized coal reburning; NOx reduction; unburned carbon; numerical simulation; full-scale boiler

Abstract: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.