排気への水噴射と排気再循環によるディーゼル機関の排気清浄化

概要

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In order to reduce the emissions of nitrogen oxides and particulates from diesel engines, exhaust gas recirculation, EGR, combined with water injection into the exhaust is proposed and has been evaluated using a pre-camber engine. In this method, exhaust gas in which particulates were separated by water injection is fed into the intake air charge. The results show that exhaust black smoke is decreased remarkably by injecting water into the exhaust strearn, and it is expected that a greater black smoke reduction might be attained with less amount of water with finer atomization and better distribution. In the case of the combination of water injection and EGR, simultaneous reduction of NO and black smoke can be achieved at low load condition. At higher load, however, black smoke deteriorates with increasing the amount of recirculated gas due to the decreasing of oxygen concentration in the intake gas, so that EGR rate should be kept at low level for the purification of diesel exhaust.
津山工業高等専門学校の論文
2002-01-28