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학술저널
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한국마린엔지니어링학회 Journal of Advanced Marine Engineering and Technology (JAMET) Journal of the Korean Society of Marine Engineering Vol.32 No.3
발행연도
2008.5
수록면
394 - 403 (10page)

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The effects of water injection (WI) and urea injection for NOx on a 4 cylinder Direct Injection (DI) diesel engine were investigated experimentally. For water injection, it was installed at the intake pipe and the water quantity was controlled at the intake manifold and Manifold Air Flow (MAF) temperatures while the urea injection was located at the exhaust pipe and the urea quantity was controlled by NOx quantity and MAF. The effects of WI system, urea SCR system and the combined system were investigated with and without exhaust gas recirculation (EGR). Several experiments were performed to characterize the urea SCR system, using engine operating points of varying raw NOx emissions.
The results of the Stoichiometric Urea Flow (SUF) and NOx map were obtained. In addition, NOx results were illustrated according to the engine speed and load. It is concluded that the NOx reduction effects of the combined system without the EGR were better than those with the EGR based engine.

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Abstract
1. Introduction
2. Experimental apparatus and method
3. Results and discussion
4. Conclusion
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