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김동욱(Dong-Wook Kim),진성식(Sung-Sik Jin),김준호(Jun-Ho Kim),김경웅(Kyung-Woong Kim) 한국트라이볼로지학회 2010 한국윤활학회지(윤활학회지) Vol.26 No.4
Mechanical face seal installed in boiler feedwater pump prevents leakage of working fluid using thin fluid film between stator and rotor. If the leakage of working fluid exceeds the allowable volume, serious mal-function of boiler feedwater pump will be happen. The thinner fluid film exists between stator and rotor, the less working fluid leaks out. However, if the thickness of fluid film is not enough, the wear of seal face will be increased. And it causes the decrease in life of mechanical face seal. Therefore appropriate design is necessary to maximize the performance and life of mechanical face seal. In this study, numerical analysis using finite volume method was conducted to investigate the static characteristics of wavy mechanical face seals which have 4 different wavy surface profiles on rotor. As a result, opening force, leakage volume of working fluid and friction torque were obtained. For the same minimum film thickness, the static characteristics of mechanical face seal were affected by the wavy surface profile which can change the thickness of working fluid film and pressure distribution.
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코닝 조합이 물결 프로파일이 가공된 미케니컬 페이스 실의 작동 성능에 미치는 영향
김동욱(Dong-Wook Kim),진성식(Sung-Sik Jin),김준호(Jun-Ho Kim),김경웅(Kyung-Woong Kim) 한국트라이볼로지학회 2012 한국윤활학회지(윤활학회지) Vol.28 No.2
Non-contact type mechanical face seals installed in mechanical systems prevent leakage of working fluid using thin working fluid film between stator and rotor. For that purpose, various kinds of surface profiles, grooves and conings have been applied on seal surfaces of stator and rotor to generate hydrodynamic and hydro-static pressure. The thickness distribution of working fluid film is one of important factors which affect the working performances of mechanical face seal, and it is strongly affected by the surface height profiles of stator and rotor. Therefore, appropriate design of surface height profiles of stator and rotor is necessary to optimize the working performances and life of mechanical face seal. In this study, numerical analysis using finite volume method was conducted to estimate the working performances of wavy mechanical face seals which have 36 coning combinations. As results, minimum thickness of working fluid film, leakage volume of working fluid and friction torque in static equilibrium condition of mechanical face seal, and stiffness of working fluid film were obtained. The results show that the working performances of mechanical face seal were affected by the coning combinations which can change the thickness distribution of working fluid film and pressure distribution in scaling region of mechanical face seal.
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김영규 ( Young-gyu Kim ),진성식 ( Sung-sik Jin ),이미경 ( Mi-gyeong Lee ),김성진 ( Sung-jin Kim ),라덕관 ( Deog-gwan Ra ) 한국환경기술학회 2004 한국환경기술학회지 Vol.5 No.2
화력발전소에서 배출되는 배연탈황 폐수 중에 함유된 난분해성의 COD 성분을 제거를 위하여 산화제로 아질산나트륨을 사용하여 실험하였다. pH가 증가함에 따라 COD 제거율은 점점 감소되어 pH 6이상에서는 거의 제거되지 않았다. COD 430mg/L, pH 6.5의 배연탈황 폐수 중의 난분해성 COD성분을 제거하기 위한 적합한 조건은 pH 2, 아질산나트륨 주입농도 1,000 mg/L, 반응온도 55℃, 반응시간 90분이었으며, 이때 COD 제거율은 74.0 %이었다. 각 인자별 COD 제거에 중요한 요소로 작용하는 영향 인자는 아질산나트륨 주입농도와 pH이었으며 그밖에 반응온도, 반응시간은 결정적인 역할은 하지 않았으나 COD 제거에 영향을 미치고 있음을 알 수 있었다. FGD(Flue Gas Desulfurization) wastewater derived from thermoelectric power plant was experimented in order to remove the refractory COD of wastewater by using an oxidation agent, sodium nitrite. From results, the COD removal efficiency was gradually decreased according to the growth of pH, and than it was almost to be zero on the above pH 6. Regard the FGD wastewater characteristics, COD 430 mg/L and pH 6.5, the optimum conditions for removing the COD components were needed to change such as pH 2, 1,000 mg/L of sodium nitrite, 55℃ of reaction temperature, and 90 minute of reaction time. At that time, the COD removal efficiency could be got 74.0 %. During the several examinations in comparing the effective parameters for COD removing, the most important parameter was recorded as sodium nitrite concentration and the next was pH. Even though other parameters such as reaction temperature and time could not make important role in COD remove, these were shown as effective ones in growth the COD removal efficiency.
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