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대기온도에 따른 300 MW 석탄가스화복합발전 성능특성
김영묵,유호선,Kim, Young-Mook,Yoo, Ho-Seon 한국플랜트학회 2018 플랜트 저널 Vol.14 No.3
In this study, the output and thermal efficiency of Taean Integrated Gasification Combined Cycle Plant were calculated by using the manufacturer's basic design data and the performance correction factor for each atmospheric temperature, and the actual performance was measured at summer and winter representative points. The results were compared with the calculated values to verify their validity. The thermal efficiency is the highest at around $15^{\circ}C$ and lower at lower temperature and higher temperature. This is similar to that of natural gas Combined Cycle Power Plant, but the thermal efficiency has drastically decreased due to the increase of power consumption of the air separation unit at relatively high temperature. The output is highest in the range of 5 to $15^{\circ}C$, and is kept almost constant at below $5^{\circ}C$ and declines above $15^{\circ}C$. The reason why the output does not increase at low temperatures is that the torque limit of the shaft is activated by the increase of the flow rate due to the nitrogen injection of the gas turbine combustor. In order to improve the performance in the future, efforts should be made to improve the power generation output and to reduce the power consumption of the air separation unit in summer. 본 연구에서는 태안석탄가스화복합발전을 대상으로 대기온도에 따른 출력 및 열효율 변화를 제작사의 기본설계자료와 대기온도별 성능보정계수를 이용하여 계산하였으며, 하계 및 동계 대표지점에서 실제 성능을 측정하고 그 결과를 계산값과 비교하여 타당성을 확인하였다. 열효율은 $15^{\circ}C$ 부근에서 가장 높고 이보다 저온이나 고온에서는 낮아지는데 이는 천연가스복합발전과 유사하였으나, 상대적으로 고온구간에서는 공기분리장치의 소비동력증가로 열효율이 급격히 하강하였다. 또한 출력은 $5{\sim}15^{\circ}C$ 구간에서 가장 높고 $5^{\circ}C$ 이하에서는 거의 일정하게 유지되며 $15^{\circ}C$ 이상에서는 하락한다. 저온에서 출력이 증가하지 않는 이유는 가스터빈 연소기 질소주입에 따른 유량 증가로 축의 토크 제한이 작동하기 때문이다. 향후 성능향상을 위해서는 하계에 발전출력향상 및 공기분리장치 소비동력 저감 등의 노력이 필요하다.
金英默 大田工業大學 1991 한밭대학교 논문집 Vol.8 No.2
Many natural slope failure in Korea occur every rainy season and the rainy season is concentrated from July to August. The natural slopes are infinite slopes that contain some finite soil depth and dry condition or partly saturated condition. The soil is wetted when rainfall infiltrates into unsaturated ground, generally. This paper aims at the development of tips whitch can measure negative pore water pressure easy and economically, and evaluation of possibility of pratical use. For this purpose an experment study is carried out what is called column test using the tips. From this study the tips of negative pore water pressure measured easy and accuracy is creditable.
유방 X-선 촬영술의 내외사방향 촬영에서 관찰되는 액와 림프절의 임상적 의의
김영묵 대한영상의학회 1995 대한영상의학회지 Vol.32 No.1
Purpose : To evaluate the radiologic characteristics of axillary lymph nodes which are found on mediolateralablique (MLO) view of mammography and to assess their clinical significance. Materials and Methods : Weretrospectively evaluated 119 cases axillary lymph nodes on MLO view of 410 cases of mammography in 205 patientsregarding the size, bilaterality, number, grade of density, presence of central lucency, calcification of lymphnodes and presence of associated parenchymal pathologic lesions in breast. Results : Axillary lymph nodes on MLOview were demonstrated in 119 (29%) among 410 cases. Axillary lymph nodes (112 cases) in cases without breastparenchymal lesions or with benign breast lesions showed; unilaterality in 68 cases (61%), smaller than 1.5cm in100 cases (89%), lower density than breast parenchyma in 99 cases (88%), presence of central lucency in 99 cases(88%) and calcification in 3 cases (2.7%). Axillary lymph nodes (7 cases) in cases with breast cancer showed smallsize of less than 1.5cm in 4 cases (57%), absence of central lucency in 7 cases (100%) and iso-to higher densitythan breast parenchyma in 7 cases (100%). Conclusion : Axillary lymph nodes noted on MLO view of mammography, morethan 1.5cm in diameter, absence of central lucency and iso to higher density than breast parenchyma could besuggested as clinically significant.
金英默,李大澈,林熙大 충남대학교 공업교육연구소 1988 論文集 Vol.11 No.1
Most chemical contaminants are transported by groundwater in the saturated zone. To reach the saturated zone, these contaminants must somehow be transported from the surface and ground. There are a number of mechanisms that can contribute to this process. However, available information indicates that natural and induced infiltration from the soil surface, are probably the most inportant mechanisms. The prevention of groundwater pollution thus requires that more attention should be directed towards the unsaturated zone. The application of numerical models to unsaturated flow and transport problems requires detailed knowledge of the soil water retention and unsaturated hydraulic conductivity functions of the medium. The present paper starts with a brief summary of theory underlying flow and transport in the unsaturated zone, and discuss characteristics of contaminant transport and applications by the numerical method.
金英默,陸喆洙 대전산업대학교 1999 한밭대학교 논문집 Vol.16 No.1
To study seepage behaviors a model was designed and designed and was applied to some cases of enlargement of river embankment. The model is simulated and analysed by finite element method. The materials of enlargement are coarse sand, fine sand, and weathered residual soil. Usually, the embankment of small rivers is made of these materials. The aim of this study is to aid for selection of desirable materials for enlargement of old embankment in small rivers. The results of seepage behavior by finite element method are similar to the results of the experiment. The seepage behavior is unstable at the rapid rise and drawdown water level in uniform landfills. The enlargement of outward slope using some sands shows stable seepage behavior in the old embankment made of weathered residual soils. The enlargement of inward slope by some residual soils is more stable seepage behavior in the old embankment made of some sand soils. In this case, the flow of the outward slope is mainly unsaturated flow, and the pore water pressure of the outward slope is low or negative. The outward part of embankment seems to serve as filtration in the stable case of seepage behavior.