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오광영 ( Kwangyoung Oh ),김진수 ( Jinsoo Kim ),오승영 ( Seungyoung Oh ) 한국농공학회 2009 한국농공학회 학술대회초록집 Vol.2009 No.-
The purpose of this study was to investigate characteristics of behavior of nutrients such as TN (Total nitrogen), TDN (Total dissolved nitrogen), TP (Total phosphorus) TDP (Total dissolved phosphorous) in runoff water from a nonpoint source dominated watershed (6.7 ㎢). Regular and intensive flow measurement and water sampling were taken during two years (February 2002 to January 2004) in the Ingyeong River, a tributary of the Han River. The mean concentrations of nutrients during rainy days were significantly (p < 0.05) higher than those during dry days. The mean TDN/TN ratio in rainy days (95%) is almost identical to that in dry days (96%), but mean TDP/TP ratio in rainy days (24%) significantly decreased compared with that in dry days (66%), suggesting that dominant form of TP is shifted from dissolved form to particulate form. Accordingly, the measures (.eg. filter strips, cover crops) to reduce soil erosion for fallow upland in the rainy season should be taken to control particulate phosphorous.
Urea-SCR System의 NH₃ Slip 저감을 위한 NOx Sensor 기반 폐루프 제어기 개발에 관한 연구
강석호(Seokho Kang),오승영(Seungyoung Oh),이민광(Minkwang Lee),김훈명(Hoonmyung Kim),강정호(Jeongho Kang) 한국자동차공학회 2021 한국 자동차공학회논문집 Vol.29 No.2
For non-road diesel engines of 56 kW or higher, the application of SCR is essential in order to comply with the NOx regulation of the current emission regulations. In order to maximize the NOx reduction efficiency of the SCR system, the NH₃ adsorption characteristics of the SCR catalyst can be utilized. Since the NH₃ adsorbed on the SCR catalyst has no direct measurement method, it is inevitable to rely on the NH₃ adsorption estimation model, and there is a possibility that NH₃ slip may occur due to model error. Therefore, this study proposed a closed loop control method in order to minimize NH₃ slip by utilizing the NOx sensor signal at the SCR catalyst outlet. It was verified through the NRTC mode, the certification test mode for non-road diesel engines. As a result of the test, it was confirmed that the closed loop controller proposed in this study can reduce NH₃ slip through detailed calibration.