水選択排気再循環によるディーゼル機関の窒素酸化物の低減

概要

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Exhaust-water-selective recirculation is proposed for the purpose of reducing the emission of nitrogen oxides from diesel engines. In this method, water is extracted from the exhaust and fed directly into the intake air charge. This system operates as a closed system without a supplementary water charge. The exhaust-water-selective recirculation effectively works to decrease the combustion temperature due to the large heat capacity and heat of vaporization, thereby greatly reducing the amount of exhaust nitric oxide. Particulate emission and brake-specific fuel consumption are lower compared to ordinary exhaust gas recirculation when the amount of recirculated water is not excessive. It is expected that a diesel engine with exhaust-water-selective recirculation may achieve reduction of NO without sacrificing the thermal efficiency, when the system is combined with retarded fuel injection and engine-load-dependent water injection.
一般社団法人日本機械学会の論文
1995-06-25