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chemical equilibrium analysis). The solid state of HgO begins to decompose at
700 K. This observation shows that the decreased mercury oxidation efficiency
under 573 K is not caused by HgO decomposition and still rely on the
decomposition of ozone itself.
Fig. 3.16
Equilibrium analysis of the HgO decomposition
3.3.5 Oxidation Mechanism Between O
3
and CO
If O
3
effectively oxidizes CO in flue gas to raise the O
3
consumption, the
oxidation of NO
x
and Hg
0
is surely affected. Consequently, the CO concentration
variation with the O
3
ejection has been studied so as to evaluate the CO oxidation
properties. Within the experiment system graphed in Fig. 3.8, the original CO
concentration, reaction temperatures, and total gas flux were 400 ppm, 100 -
300 °C, and 1 L/min, respectively. The residence time was 33.3
K
/
T
s (
T
denotes
the unit of temperature, K). The flue gas composition was measured online by the
Rosemont gas analyzer. The experimental data profile is presented in Fig. 3.17.
It can be seen that the CO concentration varies slightly when the ratio of O
3
to
CO increases from 0.86 to 3.5 and temperature increases from 100 °C to 300 °C.
This observation means that at temperature levels not exceeding 300 °C, no
obvious CO oxidation reaction develops in the flue gas with O
3
ejection and thus
its influence no the total O
3
consumption can be omitted.
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