(57) An activated, ionized fuel which allows a reduction in the generation of nitrogen
oxides is produced by an apparatus having an extremely simple structure, and combustion
of the activated, ionized fuel is realized by a combustion system. Both a liquid fuel
injection valve (25) and a water injection valve (30) inject a liquid fuel and water
toward a mixing-stirring chamber (31). The liquid fuel and water injected opposite
to each other are mixed together by stirring in the mixing-stirring chamber (31),
thereby being activated, ionized as well as emulsified. Since it has been activated,
ionized as well as emulsified, the fuel is highly combustible and allows a reduction
in the content of nitrogen oxides in the exhaust gas.
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