ディーゼルエンジン吸気への高流量NO注入の排気ガス組成および燃料消費率への影響（エンジン負荷による影響の相違）

概要

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Nitrogen monoxide (NO) was injected into a stationary diesel engine generator (rating load: 2 kW) at high flow rates much larger than those achieved in the exhaust gas recirculation (EGR), and the influence of the injection was investigated with a several engine loadings. The injected NO reduced the generation of thermal NOx more effectively with higher engine loads. CO and HC in the exhaust gas decreased more with lower loads. When the NOx concentration was about 2400 ppm at the intake of the engine, the specific fuel consumption (the fuel consumption at a unit power output) decreased by 0.4 and 1.6% with the engine loads of 1.0 and 0.5 kW, respectively. However, it increased by 0.3% with the load of 1.5 kW. Subsequently, the change in combustion heat was estimated using the NOx, CO and HC concentration changes. This estimation agrees well with the experimental results about fuel consumption in case where the loads are 0.5 and 1.0 kW. It might be suggested that the thermal efficiency of the engine is affected by the NO injection in case where the load is 1.5 kW.