한국자동차공학회논문집 (Transactions of the Korean Society of Automotive Engineers)

  • 제22권4호
  • /
  • Pages.111-120
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  • 2014
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  • 1225-6382(pISSN)
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  • 2234-0149(eISSN)
한국자동차공학회 (The Korean Society of Automotive Engineers)
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ECU 커먼레일 디젤기관에 있어서 매연 및 NOX 배출물 동시 저감용 일체형 요소-SCR 촉매필터 시스템의 특성에 관한 연구

A Study on Characteristics of an Integrated Urea-SCR Catalytic Filter System for Simultaneous Reduction of Soot and NOX Emissions in ECU Common-rail Diesel Engines

  • 배명환 (경상대학교 기계설계학과)
  • Bae, Myung-Whan (Department of Mechanical Engineering for Production, Gyeongsang National University)
  • 투고 : 2013.09.12
  • 심사 : 2013.12.20
  • 발행 : 2014.05.01
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초록

The aim of this study is to develop an integrated urea-SCR catalytic filter system for reducing soot and $NO_X$ emissions simultaneously in diesel engines. In this study, the characteristics of exhaust emissions relative to reactive activation temperature under four kinds of engine loads are experimentally investigated by using a four-cycle, four-cylinder, direct injection type, water-cooled turbo intercooler ECU common-rail diesel engine with the integrated urea-SCR $MnO_2-V_2O_5-WO_3/TiO_2/SiC$ catalytic filter system operating at three kinds of engine speeds. The urea-SCR reactor is used to reduce $NO_X$ emissions, and the catalytic filter system is used to reduce soot emissions. The reactive activation temperature is very important for reacting a reducing agent with exhaust emissions. The reactive activation temperatures in this experiment is applied to 523, 573 and 623 K. The fuel is sprayed by the pilot and main injections at the variable injection timing between BTDC $15^{\circ}$ and ATDC $1^{\circ}$ according to experimental conditions. It is found that the $NO_X$ conversion rate is the highest as 83.9% at the reactive activation temperature of 523 K in all experimental conditions of engine speed and load, and the soot emissions shown by the average reduction rate of approximately 93.3% are almost decreased below 0.6% in all experimental conditions regardless of reactive activation temperatures. Also, the THC and CO emissions by oxidation reaction of Mn, V and Ti are shown in the average reduction rates of 70.3% and 38% regardless of all experimental conditions.

키워드

참고문헌

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