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초록· 키워드

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The effects of intake mixture temperature on performance and exhaust emissions under four kinds of engine loads were experimentally investigated by using a four-cycle, four-cylinder, swirl chamber type, water-cooled diesel engine with scrubber EGR system operating at three kinds of engine speeds. The purpose of this study is to develop the scrubber exhaust gas Recirculation (EGR) control system for reducing NO_x and soot emissions simultaneously in diesel engines. The EGR system is used to reduce NO_x emissions. And a novel diesel soot-removal device of cylinder-type scrubber with five water injection nozzles is specially designed and manufactured to reduce soot contents in the recirculated exhaust gas to the intake system of the engine. The influences of cooled EGR and water injection, however, would be included within those of scrubber EGR system. In order to survey the effects of cooled EGR and moisture on NO_x and soot emissions, the intake mixtures of fresh air and recirculated exhaust gas are heated up using a heater with five heating coils equipped in a steel drum. It is found that intake and exhaust oxygen concentrations are decreased, especially at higher loads, as EGR rate and intake mixture temperature are increased at the same conditions of engine speed and load, and that NO_x emissions are decreased, while soot emissions are increased owing to the decrease in intake and exhaust oxygen concentrations and the increase in equivalence ratio. Thus one can conclude that NO_x and soot emissions are considerably influenced by the cooled EGR.

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Abstract
1. Introduction
2. Experimental apparatus and procedures
3. Results and discussion
4. Conclusions
Acknowledgments
References

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UCI(KEPA) : I410-ECN-0101-2009-559-013742926