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디젤 엔진 Urea-SCR DeNOx 시스템용 혼합전위 방식 암모니아 가스 센서의 감지물질 특성 비교
최안기 ( An Gi Choi ),양영창 ( Young Chang Yang ),구본철 ( Bon Chul Koo ),박종욱 ( C. O. Park ) 한국센서학회 2010 센서학회지 Vol.19 No.3
It is considered that the urea injection DeNOx SCR(selective catalytic reduction) system is the only promising method to satisfy the worldwide NOx emission standards. As for the theoretical aspect, reactants of NO and NO2 with NH3 produce H2O, N2 and O2 which do not harm human beings and environmental as well. The realization of maximum NOx conversion (without using a post oxidation catalyst) is only possible with closed loop controlled urea dosing. It means built-in NH3 gas sensor have to be developed for detecting accurate NH3 concentration for the feedback system. Using YSZ(yttriastabilized zirconia) as a solid state electrolyte and In2O3 as a sensing material, this paper aims to study dependable NH3 gas sensor for the promising solution of DeNOx technology, which have a reproducible electric output signal, a high sensitivity and fast response.
Nb 함유 HSLA 강의 저주기 피로실험에서 분위기의 영향 및 소성변형에너지에 관한 연구
홍순형,박종욱,이원종 대한금속재료학회(대한금속학회) 1989 대한금속·재료학회지 Vol.27 No.5
The influence of plastic strain amplitude and gaseous environment on the low cycle fatigue properties has been studied in a Nb-bearing HSLA steel. The cyclic response under plastic-strain controlled loading is determined. Neither the cyclic stress-strain curve (CSSC) shows a plateau nor persistent slip bunds (PSB's) have been observed in the bulk. The cyclic plastic strain energy (ΔW) and the accumulated plastic strain energy (W) have been calculated as a function of plastic strain amplitude (Δ_(εΡ)/2) in the form of Κ(Δ_(εp)/2)^N. The computed values of ΔW and W are in good agreement with the experimental data. The vacuum environment enhances fatigue crack initiation life, fatigue life and W. The environmental effect becomes more severe as the plastic strain amplitude decreases. Tensile properties, cyclic stress response and ΔW are not affected by the gaseous environment.