Environmental Engineering Reference
In-Depth Information
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2
5
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4
3
Fig. 3.9
Schematic of the quartz flow reactor
1) Inlet 1; 2) Inlet 2; 3) Outlet; 4) Air cooling; 5) Quartz flow reactor; 6) Preheat channels
The total flow rate of all reactants, including O
3
and the simulated flue gas,
were fixed at 1000 mL/min. The residence time in the center tube ranged from
0.049 to 0.089 s and varied with the temperature calculated by 33.3
K
/
T
s, while
that in the washing tower was approximately 9.7 s. The initial component
concentrations used in the test were 215±10 ppm NO, 220±10 ppm SO
2
,
4000±200 ppm O
3
, and 50±0.5 μg/m
3
Hg, respectively.
3.3.2 Oxidation Mechanism Between O
3
and NO
In most practical flue gas, NO is the predominant nitrogen species of NO
x
. Unlike
NO, the other species such as NO
2
, NO
3
, and N
2
O
5
are highly soluble in water,
which can be captured in a SO
2
removal equipment, such as the WFGD system.
Therefore, NO oxidation is the first step for the simultaneous removal of SO
2
and
NO
x
. When O
3
is injected into the center tube, NO in the flue gas can be oxidized
into NO
2
, NO
3
, and N
2
O
5
, as shown in the following reactions:
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