Influence of burner-port geometry in hydrocarbon oxidation and NOx formation mechanisms in methane/air flames

被引：4
作者：
Caldeira-Pires, A
Correia, DP
Maia, P
Lacava, P
Heitor, MV
机构：
[1] Inst Nacl Pesquisas Espacials, Lab Combust & Propuls Rod, BR-12630000 Cachoeira Paulista, SP, Brazil
[2] Univ Tecn Lisboa, Inst Super Tecn, P-1049001 Lisbon, Portugal
[3] Inst Tecnol Aeronautica, BR-12228900 Sao Jose Dos Campos, Brazil
来源：
FUEL | 2002年 / 81卷 / 06期
基金：
巴西圣保罗研究基金会;
关键词：
NOx formation; methane non-premixed flames; industrial burner;
D O I：
10.1016/S0016-2361(01)00212-5
中图分类号：
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号：
0807 ; 0820 ;
摘要：
The influence of burner-port geometry in the mechanisms of hydrocarbon oxidation and NOx formation from a 50 kW industrial-type methane-fired burner was investigated experimentally. Imaging and temographic reconstruction techniques were used to assess the effects of port geometry upon flame visible length and C-2 chemiluminescence distribution in the recirculation zone, C-2 emission of methane flames depicts that low fuel jet velocities allow very rich conditions at recirculation zone and lead methane oxidation through O-2-scarcity mechanism. Higher velocities imply that methane oxidises via a path including dissociation into free radicals. In-furnace measurements were performed from a refractory-lined vertical furnace. NOx concentration results revealed that NO formation is closely connected with the dissociation process, suggesting that prompt-NOx mechanism is more important than hitherto supposed. (C) 2001 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码：771 / 783
页数：13
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