Environmental Engineering Reference
In-Depth Information
Baulch
et al.
[77]
73 N+O
2
=NO+O
6.40E09
1.0
6280
Baulch
et al.
[78]
74 N+OH=NO+H
3.80E13
0.0
0.0
Avramenko
et al.
[79]
75 N+CO
2
=NO+CO
1.90E11
0.0
3400
Pagsberg
et al.
[80]
76 NO+OH=HNO
2
5.45E17
0.0
0.0
Tsang
et al.
[41]
77 O+HNO
2
=NO
2
+OH
1.21E13
0.0
5962
Mebel
et al.
[72]
78 NO
2
+NH
3
=NH
2
+HNO
2
6.70E08
3.41
29810
Hsu
[81]
79 H+HNO
2
=HNO+OH
7.57E12
0.86
4968
Hsu
[81]
80 H+HNO
2
=NO
2
+H
2
1.37E12
1.55
6617
Hsu
[81]
81 H+HNO
2
=NO+H
2
O
3.85E11
1.89
3855
DeMore
et al.
[54]
82 O
3
+HNO
2
=O
2
+HNO
3
3.01E05
0.0
0.0
DeMore
et al.
[54]
83 HNO
3
+O=NO
3
+OH
1.81E07
0.0
0.0
Boughton
et al.
[81]
84 HNO
3
+H=NO
3
+H2
3.4E12
1.53
16332
Boughton
et al.
[81]
85 HNO
3
+H=NO
2
+H
2
O
8.39E09
3.29
6280
Svensson
et al.
[82]
86 HNO
3
+NO=NO
2
+HNO
2
4.48E03
0.0
0.0
Smith
et al.
[83]
87 HNO
3
+OH=NO
3
+H
2
O
4.82E10
0.0
0.0
Connell
et al.
[84]
88 HNO
3
+OH=NO
2
+H
2
O
2
4.82E08
0.0
0.0
Chakraborty
et al.
[60]
89 HNO
3
=NO
2
+OH
6.90E17
0.0
45900
Inomata
et al.
[85]
90 HNO+O=NO+OH
2.29E13
0.0
0.0
He
et al.
[86]
91 HNO+HNO=N
2
O+H
2
O
2.55E07
3.98
1192
Soto
et al.
[87]
92 HNO+H=NO+H
2
2.7E13
0.72
654
Tsang
et al.
[41]
93 HNO+NO
2
=NO+HNO
2
6.03E11
0.0
1987
Tsang
et al.
[41]
94
HNO+OH=NO+H2O
4.82E+13
0.0
994
In general, coal-fired gas was released from combustion in the furnace and in-
jected into the rear heating surfaces, which followed a platen superheater, high
temperature superheater, high temperature reheater, steering room, updraft econo-
mizer, updraft air preheater, downdraft economizer, downdraft air reheater, elec-
trostatic precipitator along the rear flue, as stated in this unit. According to the
operating condition, temperature from the furnace outlet to electrostatic precipitator
was measured on line and arranged from 1
ˈ
434 K to 373 K. Here, total residence
time was defined as about 5 s as estimated from the platen superheater, so the cor-
responding residence time of each surface is given in Fig. 4.84.
Table 4.18 included components in a one-dimensional dynamics model derived
from the mean value calculated in a three-dimensional furnace outlet surface and
the typical species consisting of N
2
, O
2
, CO
2
, H
2
O, CO, SO
2
, NO, H
2
S, HCl, Cl
2
, Cl,
H
2
, H, OH, and three forms of mercury compound (Hg, HgCl
2
, HgO) were taken
into consideration in the model. Key gas and Hg formation distribution in the rear
heating surface was calculated by SENKIN module from CHEMKIN3.7. And the
calculation results with Hg
0
and mercury oxide forming along the rear surfaces,
corresponding to the reduction in the rear temperature, are demonstrated in Figs.
4.85 and 4.86. The Hg
0
remained constant at the beginning, and slightly decreased
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