Solar photocatalytic detoxification of non-biodegradable chlorinated hydrocarbon solvents (NBCS) is carried out in different concentrating and non concentrating devices using TiO2 as a photocatalyst fixed on the inner surface of the reaction tubes or as a slurry catalyst which has to be removed from the treated water. The reaction is most effective using 200 mg/l of TiO2 as a slurry in a non concentrating CPC reactor. The concentrating parabolic trough reactor has a poor activity because of its minor irradiated reactor surface. Catalyst coated glass tubes are less efficient then the used slurry catalyst. Their advantage is that no catalyst has not to be removed from the treated water and there is no loss of activity during treatment. Yet their physical stability is not sufficient to be competitive to the slurry catalyst. Nevertheless the degradation results are very promising and will possibly lead to commercial applications of this technology.
Verschiedene vormischende Brenner wurden für den Betrieb mit reinem Wasserstoff theoretisch und experimentell untersucht. Für die Auslegung wurden Berechnungen der Péclet‐Zahl durchgeführt. Die untersuchten Austrittsquerschnitte bei unterschiedlichen Vorwärmungstemperaturen des Gasgemischs und stöchiometrischer Mischung erwiesen sich als unterkritisch. Es konnte ein flammenrückschlagsfreier Betrieb des Brenners für eine Anströmgeschwindigkeit der Gasmischung von größer 12 m s−1 nachgewiesen werden. Der vormischende Brenner für reinen Wasserstoff zeigte eine stabile Verbrennung im Betrieb.
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