The effect of water addition on NO formation in counterflow CH4/air premixed flames was investigated by numerical simulation. Detailed chemistry and complex thermal and transport properties were employed. The results show that the addition of water to a flame suppresses the formation of NO primarily due to flame temperature drop. Among a lean, a stoichiometric, and a rich premixed flame, the effectiveness of water addition is most significant for the stoichiometric flame and least for the rich flame. The addition of water also reduces the formation of NO in a flame because of the chemical effect. Compared to the stoichiometric flame, the chemical effect is intensified in the lean and rich flames.

1.
Li
,
S. C.
, and
Williams
,
F. A.
, 1999, “
NOx Formation in Two-Stage Methane-Air Flames
,”
Combust. Flame
0010-2180,
118
, pp.
399
414
.
2.
Zhao
,
D.
,
Yamashita
,
H.
,
Kitagawa
,
K.
,
Arai
,
N.
, and
Furuhata
,
T.
, 2002, “
Behavior and Effect on NOx Formation of OH Radical in Methane-Air Diffusion Flame with Steam Addition
,”
Combust. Flame
0010-2180,
130
, pp.
352
360
.
3.
Park
,
J.
,
Kim
,
S. C.
,
Keel
,
S. I.
,
Noh
,
D. S.
,
Oh
,
C. B.
, and
Chung
,
D.
, 2004, “
Effect of Steam Addition on Flame Structure and NO Formation in H2–O2–N2 Diffusion Flame
,”
Int. J. Energy Res.
0363-907X,
28
, pp.
1075
1088
.
4.
Hwang
,
D. J.
,
Choi
,
J. W.
,
Park
,
J.
,
Keel
,
S. I.
,
Ch
,
C. B.
, and
Noh
,
D. S.
, 2004, “
Numerical Study on Flame Structure and NO Formation in CH4–O2–N2 Counterflow Diffusion Flame Diluted with H2O
,”
Int. J. Energy Res.
0363-907X,
28
, pp.
1255
1267
.
5.
Bhargava
,
A.
,
Colket
,
M.
,
Sowa
,
W.
,
Casleton
,
K.
, and
Maloney
,
D.
, 2000, “
An Experimental and Modeling Study of Humid Air Premixed Flames
,”
J. Eng. Gas Turbines Power
0742-4795,
122
, pp.
405
411
.
6.
Guo
,
H.
,
Ju
,
Y.
,
Maruta
,
K.
,
Niioka
,
K.
, and
Liu
,
F.
, 1997, “
Radiation Extinction Limit of Counterflow Premixed Lean Methane-Air Flames
,”
Combust. Flame
0010-2180,
109
, pp.
639
646
.
7.
Guo
,
H.
,
Smallwood
,
G. J.
,
Liu
,
F.
,
Ju
,
Y.
, and
Gülder
,
Ö. L.
, 2005, “
The Effect of Hydrogen Addition on Flammability Limit and NOx Emission in Ultra-Lean Counterflow CH4/Air Premixed Flames
,”
Proc. Combust. Inst.
1540-7489,
30
, pp.
303
311
.
8.
Gregory
,
P.
,
Smith
,
D. M.
,
Golden
,
M.
,
et al.
http://www.me.berkeley.edu/gri_mech/http://www.me.berkeley.edu/gri_mech/.
9.
Rørtveit
,
G. J.
,
Hustad
,
J. E.
,
Li
,
S.
, and
Williams
,
F. A.
, 2002, “
Effects of Diluents on NOx Formation in Hydrogen Counterflow Flames
,”
Combust. Flame
0010-2180,
130
, pp.
48
61
.
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