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플라즈마를 이용한 디젤 엔진 배기가스 중의 NOx 저감에 관한 실험적 연구
조기현(Kihyun Cho),황의현(Uihyun Hwang) 한국자동차공학회 1999 한국 자동차공학회논문집 Vol.7 No.8
To remove nitrogen oxides(NOx) in exhaust gas of diesel engine, three-way catalytic process with plasma discharger has great possibilities. Characteristics of NOx removal depends on NO conversion to NO2 and/or HNO3 due to high activation energies for NO oxidation and reduction. NOx removal efficiency by using three-way catalytic with plasma discharger indicated about 50% at 40watt power consumption condition.
증기터빈 로터 중심공 묻힘 결함에 대한 해석적 수명 평가 기준 제시
황미경(Mikyung Hwang),조기현(Kihyun Cho) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
The steam turbine rotor receives a radial temperature gradient when starting up and shutting down of the turbine, and fatigue and creep damage occur depending on the operation condition. Reliable steam turbine operation is necessary for stable power supply and as a basis for this, power generation companies are required to perform the life assessment for structural integrity in Article 32 of ELECTRIC UTILITY ACT. However, it is difficult to apply a standardized guideline because this criterion for the remaining life evaluation are based on the contract partners own standards. In this study, in order to provide the reliable life assessment method of steam turbines, heat transfer, and stress analysis and fracture mechanics based life assessment is performed on the high-pressure rotor bore. The results of the evaluation were verified by comparing SAFER-PC, Rotor Life Assessment Program, developed by Electric Power Research Institute (EPRI).