Environmental Engineering Reference
In-Depth Information
Fig. 4.1 Diagram of the experimental setup that combines O 3 oxidation with a wet scrubber
Ta b l e 4. 1 Properties of the gases used in the experiments
Gas
Concentration
Volume/Pressure
Producer
N 2
High pure (99.999%)
40 L/15.0 MPa
Jingong Gas, Hangzhou
O 2
High pure (99.999%)
40 L/15.0 MPa
Jingong Gas, Hangzhou
NO/N 2
1.2%
8 L/9.5 MPa
Xinsiji Gas, Hangzhou
SO 2 /N 2
1.2%
8 L/9.5 MPa
Xinsiji Gas, Hangzhou
NO 2 /N 2
1.2%
8 L/9.5 MPa
Xinsiji Gas, Hangzhou
HCl/N 2
1.2%
8 L/9.5 MPa
Xinsiji Gas, Hangzhou
4.3 Effect of pH Value on NO 2 Removal
As mentioned above, NO 2 in the gas bottle was employed as an oxidation product
when the molar ratio O 3 /NO was 1 in the experiments. Given the inevitability of
NO in the NO 2 gas from the bottle, the NO 2 gas employed actually comprised
300±5 ppm NO 2 and around 10 ppm NO, with the gas phase balance controlled by
Eqs. (4.2) and (4.3). This means that aside from NO 2 and NO, a little N 2 O 3 and
N 2 O 4 exist in the gas phase. The EQUIL model of CHEMKIN 4.7 was employed
before the experiments to calculate the balanced composition of the employed 300
ppm NO x .
K
⎯→
NO+NO 2
N 2 O 3
(4.2)
1
K
⎯→
NO 2 +NO 2
N 2 O 4
(4.3)
2
Fig. 4.2 shows the balanced compositions of NO x at different ORs (i.e., the
molar ratio of NO 2 to NO x ). The figure also shows that NO and NO 2 are the main
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