Influence of Near Burner Combustion Modifications on NOxFormation from an All-Axial Multifuel Burner
作者:
J. P. SPINTI,
D. W. PERSHING,
J. BROUWER,
M. P. HEAP,
期刊:
Combustion Science and Technology
(Taylor Available online 1997)
卷期:
Volume 126,
issue 1-6
页码: 1-21
ISSN:0010-2202
年代: 1997
DOI:10.1080/00102209708935666
出版商: Taylor & Francis Group
关键词: Coal and char combustion;environmental combustion-NOx
数据来源: Taylor
摘要:
Tests were conducted with a naturally staged, axial jet burner firing pulverized coal to evaluate near burner combustion modification alternatives for controlling NOxemissions to ultra low levels in a combustor operating with hot, running slag walls. The study focused on the use of small amounts of natural gas rather than swirl air to aid the stabilization of the axial pulverized coal flames. The relative importance of primary jet velocity and primary air stoichiometyr were determined for these gas stabilized flames. Decreases in primary jet velocity had a dramatic effect on near burner NO production while primary air stoichiometry appeared to have a negligible effect. Another near Burner modification, the use of a vitiated secondary air stream, did not significcantly affect NO levels. Ultra low No levels (below 90 ppmv) were achieved in theis hot-walled combuster by optimizing the performance of the gas stabilized burner in conjunction with staged combustion and reburning.
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