Environmental Engineering Reference
In-Depth Information
Transformation in Flue Gas
4.3.3 Model Simulation of Mercury Reaction in the Flue Gas
The model established in this section presents the quantitative mathematical model
of Hg
0
to Hg
2+
in the simulated flue gas. Through the model, the degree of the
transformation from Hg
0
to Hg
2+
under different reaction conditions, such as con-
centration, temperature, could be gained.
4.3.3.1 Comparison Between Simulated and Experimental Results
In the specified reaction conditions, it simulated the transformation process of Hg
0
to Hg
2+
. The simulated results were compared with the experimental results. The
results are presented from Figs. 4.49 to 4.52. The basic reaction flue gas concen-
trations consisted of 6.478 g/m
3
Hg
0
, 7% O
2
, 13% CO
2
, 1,200 ppm SO
2
, and 800
ppm NO. High-purity N
2
was used as the balance gas.
Figs. 4.49 and 4.51 show the comparison between the simulated and the ex-
perimental results with 20 and 60 ppm HCl at 100 °C reaction temperature, re-
spectively. Figs. 4.50 and 4.52 show the comparison between the simulated and the
experimental results with 20 and 100 ppm HCl at 900 °C, respectively.
Figs. 4.49
4.52 show that the simulated results were very close to the experimental results.
6.4
5.0
Experimental value
-- Calculated value
6.2
Experimental value
-- Calculated value
4.5
6.0
5.8
4.0
5.6
3.5
5.4
3.0
5.2
5.0
2.5
4.8
2.0
4.6
4.4
1.5
2
4
6
8
10
12
14
16
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
Time (s)
Time (s)
Fig. 4.49
Comparison between the experi-
mental and simulated results (
C
HCl
=20 ppm,
T
=100 °C)
Fig. 4.50
Comparison between the
experimental and simulated results (
C
HCl
=20
ppm,
T
=900 °C)
6.0
Experimental value
-- Calculated value
3.0
5.5
Experimental value
-- Calculated value
2.5
5.0
2.0
4.5
1.5
4.0
1.0
3.5
3.0
0.5
2
4
6
8
10
12
14
16
0.51.01.52.02.53.03.54.04.55.0
Time (s)
Time (s)
Fig. 4.51
Comparison between the
experimental and simulated results (
C
HCl
=60
ppm,
T
=100 °C)
Fig. 4.52
Comparison between the
experimental
and
simulated
results
(
C
HCl
=100 ppm,
T
=900 °C)
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