505 舶用排ガス湿式後処理における電解海水応用の基礎研究

概要

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It is the purpose of this paper to introduce the usage of seawater and its electrolysis for the exhaust emission control in marine diesel engines. First, with using only seawater that is naturally alkaline (pH typically around 8.1), the SO_2 and SO_3 are absorbed by relatively a high solubility compared to other components of exhaust pollutants, and PMs (Particulate Matter) are removed through direct contact with sprayed seawater droplets. Besides, the electrolyzed alkaline seawater, which contains mainly NaOH together alkali metal ions (i.e. Na^+, Mg^<2+>, Ca^<2+>), is used as the absorption medium of NOx and CO_2. Especially, to increase NOx absorption rate into the alkaline seawater, nitric monoxide (NO) is adequately oxidized to nitric dioxide (NO_2) in the acidic seawater, which means both volume fractions are adjusted to identical proportion. Finally, the research would plan to treat the effluent by applying electro-dialysis and electro-flotation techniques. This way to reduce emissions from the marine diesel engines is to make it attractive from an operating perspective, as well as an environmental perspective.