Environmental Engineering Reference
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concentration was about 30% higher under conditions 3 and 4. In the mixed com-
bustion of QP-S coal and HB-B coal, the oxidation of Hg
0
in the flue gas was a little
higher than that in the mixed combustion of CF-S coal and 2
#
-B coal, indicating a
possible relationship to the types of coal.
70
Hg
0
60
(g)
Hg
2+
(g)
50
40
30
20
10
0
No.1
No.2
Fig. 4.9
Ratio of Hg
0
and Hg
2+
in No. 1 and No. 2 conditions
80
70
Hg
0
(g)
Hg
2+
(g)
60
50
40
30
20
10
0
No.3
No.4
Fig. 4.10
Ratio of Hg
0
and Hg
2+
in No. 3 and No. 4 conditions
The ratios of Hg
(g)
and Hg
p
in different conditions are shown in Fig. 4.11 and
Fig. 4.12, respectively. The mercury in the flue gas had two gaseous forms (Hg
2+
and Hg
0
) and Hg
p
. The latter was the mercury in the fly-ash particles. The concen-
trations of Hg
(g)
and Hg
p
were in the flue gas in a gas-solid two-phase. The ratio of
Hg
(g)
in the total mercury ranged from 46% to 75%, whereas Hg
p
in fly ash particles
took up 59% - 70%. Overall, in No. 1 and No. 3 conditions, without limestone, the
Hg
(g)
in the flue gas had a higher ratio at 68% and 75%, respectively; however, the
proportion of Hg
p
was lower. In No. 2 and No. 4 conditions, with limestone, the
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