This research makes a new attempt to use the activated seawater by electrolysis in the wet scrubber for the large diesel engine as a sort of post exhaust gas treatment. In marine air pollution control, only SCR (Selective Catalytic Reduction) is estimated at a variable method to control NO(x), but on the other hand, seawater scrubber applying the basic characteristic that is naturally alkaline (pH typically around 8.1) is viewed as an economical SO(x) removal system at present. Especially, seawater scrubber would not be necessary to follow any of the various land based flue gas desulphurization methods, i.e. wet, dry or alkali scrubbing. However, these methods are not readily adaptable to marine conditions due to the quantities of consumables required, i.e. lime or limestone, the means of operation and the commercial availability. This research is undertaken to develop a new method as the main target of eliminating all exhaust emissions, particularly onboard, because the vessel can easily use seawater and be apt to apply a wet scrubber system. First, with using the acidic seawater by seawater electrolysis, nitric monoxide (NO) is adequately oxidized to nitric dioxide (NO2) by ClO(x) in the acidic seawater, the electrolyzed alkaline seawater by electrolysis, which contains mainly NaOH together with alkali metal ions (i.e. Na+, K+, Mg2+, Ca2+), is used as the absorption medium of NO(x), the SO(x) are absorbed by relatively high solubility compared to other components of exhaust pollutants. The results found that the NO(x) and SO(x) removals could be achieved nearly perfectly.
Development of diesel engine emission control system on NO(x) and SO(x) by seawater electrolysis
Nachbehandlung von Dieselmotor-NO(x)- und -SO(x)-Abgasen mit Elektrolyse-aktiviertem Seewasser
2004
6 Seiten, 12 Bilder, 4 Tabellen, 6 Quellen
Aufsatz (Konferenz)
Datenträger
Englisch
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