Environmental Engineering Reference
In-Depth Information
15.14
Illustration of a two-chamber regenerative thermal oxidation
unity (Copyright: Fraunhofer IWES, 2012).
15.15
Regenerative thermal oxidation system for off-gas treatment at a
biogas upgrading plant (Copyright: Fraunhofer IWES).
flow direction is switched [48]. Figure 15.15 shows a RTO system for off-gas
treatment at a biogas upgrading plant.
Catalytic oxidation is another off-gas treatment method, which is of
particular relevance to off-gas streams of PSA systems [33]. Because
impurities such as H
2
S act as a catalyst poison, there are increased
requirements on the gas composition compared with RTO [48]. Platinum
and palladium are usually used as catalyst materials, but cobalt may also be
used [9, 48]. Autothermal operation is already possible with methane
concentrations of 0.4%
Vol
, equal to 2.7 g CH
4
/m
n
3
[48], but the start-up
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