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선택적 환원 촉매(SCR)에서 암모니아(NH₃) 분사량 최적화에 대한 실험적 연구
장익규(Ik-Kyoo Jang),윤여빈(Yu-Bin Yoon),박영준(Young-Joon Park),이성욱(Seang-Wock Lee),조용석(Yong-Seok Cho) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
The Selective catalytic reduction(SCR) system is a highly-effective device of NO<SUB>x</SUB> reduction for diesel engines. Generally, the ammonia(NH₃) generated from a liquid urea-water solution is used for the reductant. The ideal ratio of NH₃ molecules to NO<SUB>x</SUB> molecules is 1:1 based on NH₃ consumption and having NH₃ available for reaction of all of the exhaust NO<SUB>x</SUB>. However, under the too low and too high temperature condition, the NO<SUB>x</SUB> reduction efficiency becomes lower, due to temperature window. And space velocity also affects to NO<SUB>x</SUB> conversion efficiency. This paper reviews a laboratory study to evaluate the effects of NO<SUB>x</SUB> and NH₃ concentrations, gas temperature and space velocity on the NO<SUB>x</SUB> conversion efficiency of the SCR system. The maximum conversion efficiency of NO<SUB>x</SUB> was indicated when the NH₃ to NO<SUB>x</SUB> ratio was 1.2 and the space velocity was 60,000 h?¹. The results of this paper contribute to improve overall NO<SUB>x</SUB> reduction efficiency and NH₃ slip.
가솔린기관의 합성가스 배기분사 기술의 최적화에 관한 실험적 연구
문창호(Chang-Ho Moon),장익규(Ik-Kyoo Jang),박영준(Young-Joon Park),이성욱(Seang-Wock Lee),조용석(Yong-Seok Cho) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
During a cold-start period of an SI engine, fast increase in exhaust gas temperature is very crucial to improve emission due to the enhancement of catalytic performances. Synthetic gas reformed from hydrocarbon-based fuel consists of H₂, CO and N₂. Hydrogen contained in the synthetic gas is very useful species in chemical process due to its wide flammability range and fast burning speed. In this study, ESGI(Exhaust Synthetic Gas Injection) system is used to shorten the light-off time of a three-way catalyst through combustion of synthetic gas injected in exhaust manifold, during cold-start period of an SI engine. Engine control variables such as synthetic gas injection pressure, air-fuel ratio, activation time of catalyst heating function and timings of air-fuel ratio control are varied precisely using an engine management system in order to find out the tendencies of the temperature variation of the catalyst and harmful emissions. Optimized injection pressure and engine variables are suggested for the reduction in harmful exhaust emission.