EHC 기반 Urea-SCR 시스템 히터 표면온도 분포의 1-D 모델링

• Published in: 한국분무공학회지 Vol. 27; no. 1; pp. 11 - 17
• Main Authors: 박선홍, Sunhong Park, 손지현, Jihyun Son, 문석수, Seoksu Moon, 오광철, Kwangchul Oh, 장성욱, Sungwook Jang, 박성서, Sungsuh Park
• Format: Journal Article
• Language: Korean
• Published: 한국분무공학회 31.03.2022
• Subjects: Convective Heat Transfer; EHC; SCR; Surface Temperature; 기계공학; 대류 열전달; 선택적 촉매환원법; 전기가열촉매; 표면온도
• ISSN: 1226-2277; 2288-9051

In upcoming Post Stage-V and Tier 5 regulations of construction machineries, nitrogen oxide (NOx) emissions are strictly limited in cold start conditions. In response to this, a method of improving NOx conversion efficiency has been applied by installing an electric heating catalyst (EHC) in front of conventional urea-SCR systems so that the evaporation and thermal decomposition of urea-water solution can be promoted in cold start conditions. In this strategy, the evaporation and thermal decomposition of urea-water solution and corresponding NOx conversion efficiency are governed by temperature conditions inside the EHC. Therefore, characterizing the temperature distribution in the EHC under various operating conditions is crucial for the optimized operation and control of the EHC in Urea-SCR systems. In this study, a 1-D modeling analysis was performed to predict the heater surface temperature distribution in EHC under various operating conditions. The reliability of prediction results was verified by comparing them with measurement results obtained using an infrared (IR) camera. Based on 1-D analysis results, the effects of various EHC operation parameters on the heater surface temperature distribution were analyzed and discussed.