Environmental Engineering Reference
In-Depth Information
Gas
Gas
Fig. 2.6
Schematic of
the
tube-type reactor
[16-18]
(With permission from Journal of Physics
D-Applied Physics)
2.3.2 Feed Gas
Organic matter
[19-22]
: Organic matters react with oxygen atoms when
hydrocarbons and halogenated hydrocarbons are added. These reactions consume
oxygen atoms and reduce the ozone production. When the hydrocarbon content is
greater than 1%, no ozone is produced.
Oxygen-contained compound
[23-25]
: More O(
1
D) radicals are consumed with
increasing N
2
O; this behavior significantly decreases the ozone production. When
the gas mixture contains 70% N
2
O, the generated ozone concentration is less than
2 ppm. The formation of O
·(N
2
O)
n
and NO
·(N
2
O)
n
results in a small discharge
current. With regard to CO
2
and H
2
O, the ozone yield increases with increasing O
2
concentration.
Non-oxygen-contained compound
[26-28]
: Under the circumstance with the
SF
6
concentration range 0.08% - 0.8%, the ozone concentration increases with
increasing SF
6
. Novoselov
et al
.
[27]
assumed that the highest ozone concentration
would be obtained when N
2
concentration was within 20% - 30%, whereas Skalny
et al
.
[26]
believed that the ozone concentration decreased with increasing N
2
.
However, it should be noted that the energy input density was different in their
experiments
[26,27]
. For Ar and H
2
, the ozone concentration increased with
increasing O
2
. Skalny
et al
.
[28]
discovered that when the O
2
content was less than
20%, adding N
2
into the mixture attained a better ozone production performance,
compared with adding Ar.
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