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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.
환원제 분사 방법 및 디퓨져 형상에 따른 LNT 촉매 전단에서의 환원제 분포 향상에 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) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
The lean NOX trap is one of the promising technologies for the NOx reduction to meet more strict future emission regulation like as EURO 5 or 6. LNT catalysts are based on the concept of absorbing NOx in lean exhaust gas conditions and reducing it in rich conditions. In generally, HC and hydrogen gas have been using as the reductant to make rich conditions. In this research, hydrogen enriched gas that made by reformer was used as the reductant. There is a relationship between concentration uniformity and NOx regeneration efficiency. If concentration uniformity was improved, The NOx regeneration efficiency would be increased. In this study, the flow characteristics and the concentration uniformity with various methods were calculated by CFD. As results, the concentration uniformity of reductant has been improved through adapted injection distance, injection angle and design of diffuser.