TED-AJ03-403 COMBUSTION AND EXHAUST EMISSIONS IN A HYDROGEN FUELED ENGINE IGNITED WITH LIGHT OIL :

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It is necessary to increase thermal efficiency and reduce exhaust emission for internal combustion engines. Alternative fuels that are not made of petroleum are also one of the important factors. Hydrogen is expected to be one of the most prominent fuels in the near future for solving greenhouse problem, protecting environment and saving petroleum. In this study, a dual fuel engine operated with hydrogen and light oil was investigated. The configuration of the diesel engine was not changed except changing the injection timing over very wide range by setting an injection pump synchronized with the engine revolution. Hydrogen was supplied in an intake port with air and light oil was injected into the cylinder. The rate of heat release was determined from the pressure in the cylinder. Here, the concept of HCCI combustion was applied to this engine. When the injection timing of the light oil into the cylinder was advanced to 40 or 50 degrees before the compression top dead center, the light oil was well mixed with hydrogen-air mixture and the combustion became mild. As shown in Fig. A, NOx emissions decreased because of lean premixed combustion without the region of high temperature of burned gas. When hydrogen was mixed with inlet air, emissions of HC, CO and CO_2 decreased Without exhausting smoke while indicated thermal efficiency was slightly smaller than that in ordinary diesel combustion. In particular, both smoke and NOx were almost zero and HC was low when the injection timing is significantly advanced. Moreover, the effects of hydrogen ratio and spray angle on exhaust emissions and engine performance were investigated. If the operating conditions in early injection are chosen appropriately, it is considered that low NOx, HC, CO and CO_2,and zero smoke, can be achieved.[figure]

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