Environmental Engineering Reference
In-Depth Information
Table 2.5
Concentrations and speciation of flue gas mercury (excluding Hg
p
) emissions into the
atmosphere (324 method)
Percentage of total
gaseous Hg (%)
Hg
0
(g/(N·m
3
))
Hg
2+
(g/(N·m
3
))
Measure
point
Total gaseous
Hg (g/(N·m
3
))
Location
Sampling
Hg
0
Hg
2+
324_A
5.63
8.51
14.14
39.8
60.2
Jiangsu After ESP
324_B
3.45
7.67
11.12
31.0
69.0
After
WFGD
324_A
4.87
0.42
5.29
92.1
7.9
Anhui
324_B
5.41
0.81
6.22
87.0
13.0
Anhui
After ESP
324_A
1.31
13.75
15.06
8.7
91.3
Table 2.6
Concentrations of total Hg
(g)
and ratio of mercury speciation emissions into the at-
mosphere (OH method)
Percentage of total
gaseous Hg (%)
Unit capacity
(MW)
Combustion
way
Pollutant
control device
Total Hg
(g)
(g/(N·m
3
))
Location
Hg
0
Hg
2+
Zhejiang
300
Four-corner
ESP
8.2145
59.0
41.0
Front and back
walls
Zhejiang
600
ESP
13.565
55.2
44.8
Jiangsu
300
Four-corner
ESP
12.1903
46.4
53.6
Fujian
300
Four-corner
SCR+ESP+FGD
2.812
15.9
84.1
2.5 Mercury Balance Analysis
Mercury balance analysis is an effective way by which to ensure the accuracy of test
results. The mercury mass balance ratio of each boiler is defined as the ratio of
output mercury quality to input mercury quality. In this reported testing, the mer-
cury mass balance ratio of each boiler ranged within (100±22)% (Table 2.7), indi-
cating that the test results were accurate.
Ta b l e 2. 7
Mercury mass balance analysis of each typical coal-fired boiler
Input
Output
Mass
balance
(%)
No.
Hg from
coal
Fly
ash
Bottom
ash
WFGD
production
Other
Gaseous
1
1
—
0.8148
0.1167
0.0040
—
93.55
2
1
—
0.7213
0.1848
0.0050
—
91.11
3
1
0.0011
0.2479
0.1787
—
0.6208
104.85
4
1
—
0.7525
0.1757
0.0040
—
93.22
5
1
0.0007
0.2453
0.0964
—
0.8810
122.34
6
1
0.0024
0.0717
0.0827
0.0002
0.9061
106.31
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