舶用機関からのNO_x低減とPM測定に関する研究

概要

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In this study, the technique for NO_x reduction and the new onboard measurement system of particulate matter (PM) were experimentally researched for the marine diesel engines. The investigation of NO_x reduction was carried out by the fuel injection system and the variable mechanism of the intake and exhaust valve using the hydraulic actuator. It was shown that the displacement from the traditional cam mechanism to the hydraulic actuator decreased the fuel consumption rate and the PM exhaust amount in a light load. The simultaneous application of internal EGR (Exhaust Gas Recirculation) and late exhaust valve opening could reduce NO_x emission without increasing the fuel consumption. The late opening was used to recover a fuel consumption rate aggravation due to internal EGR by the expansion work. Furthermore, if internal EGR was applied under the condition of constant excess air ratio, NO_x emission decreased without increasing the PM exhaust amount. An onboard system of PM measurement using (3-ray absorption method was proposed. The results of the new onboard system were compared with those of the traditional method and the problems of the new system were clarified. In addition, a onboard measurement for a diesel generator was performed using the new system, the PM emission varied widely in 25% load. The PM concentration became large in proportion to the load.
独立行政法人海上技術安全研究所の論文
2006-03-10