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Urea-SCR 시스템에서 De-NO<SUB>x</SUB> 성능 향상을 위한 배기관 설계 최적화에 관한 실험적 연구
이재균(Jae-Kyoun Lee),윤여빈(Yu-Bin Yoon),송춘섭(Chun-Sub Song),박영준(Young-Joon Park),조용석(Yong-Seok Cho),주재근(Jae-Geon Joo),김현옥(Hyun-Ok Kim) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
The selective catalytic reduction(SCR) system is potentially a highly-effective means of NOx reduction for diesel engine. Generally, SCR makes use of a reductant added to the exhaust gas that can be used for reacting nitric acids to nitrogen. The reductant, ammonia(NH₃) generated from a liquid urea-water solution. The ideal ratio of NH₃ molecules to NOx molecules is 1:1 based on NH₃ consumption and having NH₃ available for reaction of all of the exhaust NOx. The SCR system has good NOx conversion performance in the temperature window about 250 to 400℃, low space velocity also leads to increase of NOx conversion efficiency, due to long residence time in the catalyst. In this paper, Urea-SCR system has tried to find the optimal shape of the exhaust pipe for improvement of de-NOx performance. This study used the blade-type mixer and various pipes for reduction at up stream of catalyst to improve the uniformity. As a result, the de-NOx performance of Urea-SCR system was improved and exhaust geometry was optimized, too.
Urea-SCR 시스템에서 Urea 분사 방법 및 믹서 장착에 따른 환원제 분포특성에 관한 해석적 연구
임주형(Joo-Hyoung Lim),윤여빈(Yu-bin Yoon),송춘섭(Chun-Sub Song),박영준(Young-Joon Park),이성욱(Seang-Wock Lee),조용석(Yong-Seok Cho),주재근(Jae-Geon Joo),김현옥(Hyunok Kim) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
The Selective catalytic reduction(SCR) system is a highly-effective device of NOx reduction for diesel engines. Generally in SCR system, urea-water-solution is used as the reductant to produce NH₃. It is well known that NH₃ distribution in front of SCR is strongly related with de-NOx performance of SCR catalyst. when NH₃ is non-uniform, it will cause deterioration of de-NOx performance and NOx-slip. In this paper, CFD has conducted to improve de-NOx performance and NH₃-slip . As results, the concentration uniformity of reductant and mean temperature of reductant infornt of SCR have been improved by applying mixer and alternating injection methods.