http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
엄태인,강용혁,유창균,곽희열,문승현,윤현식,조재광,나은수 한국에너지학회 2001 에너지공학 Vol.10 No.1
본 축열탱크 열전달에 관한 실험적 연구는 국내에서 개발하고 있는 태양열 온수기용으로 현재 널리 이용되고 있는 탱크-코일 방식의 문제점을 해결하면서 열전달 효율이 높은 2중 축열탱크를 개발하기 위한 것이다. 2중 축열탱크의 용량은 100리터로서 수평 및 수직형으로 설치하여 실험이 가능하도록 설계.제작하였고 탱크내부의 온도는 길이방향 및 반지름 방향으로 각각 등간격으로 설치하여 측정하였고 집열매체의 입.출구온도를 동시에 측정하였다. 실험결과는 (1) 축열탱크의 형태에 관계없이 축열탱크와 열교환을 하는 열매체의 유량이 증가할수록 열전달량은 증가한다. (2) 축열탱크의 형태에 따른 탱크내부 물의 온도 상승속도는 수직형(b)인 경우가 가장 크고, 그 다음 수직형(a), 수평형의 순으로 나타났다. 따라서 이중탱크형의 축열탱크는 수평형 보다 수직형이 동일한 용량의 축열매체 온도를 신속히 상승시킬 수 있다. 아울러 열성층화에 의하여 고온의 축열매체를 이용할 경우 수직형 축열탱크가 더욱 우수한 결과를 나타낸다. (3) 축열탱크 열전달계수(UA) 값은 ( $T_{in}$ - $T_{out}$)/$\Delta$ $T_{m}$ 의 크기에 좌우되며, 열전달계수를 설치방법에 따라 비교하면 수직형(b)>수직형(a)>수평형의 순서로 나타났다.다.
Evaluation of a hot oil immersion drying method for the upgrading of crushed low-rank coal
엄태인,Jong-Seong Chae,Jae-Ho Lim,Sung-Hyun Moon 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.4
Coal is the most abundant fuel on earth, and low-rank coal (LRC) such as sub-bituminous coal and lignite makes up about half of all coal deposits. LRC is inconvenient to use due to its low caloric value and high content of moisture together with the strong tendency of spontaneous combustion due to these oxygen rich coals, etc. Solving these problems would substantially improve the efficiency of LRC usage. In this study, we describe a drying technique utilizing hot oil immersion. This upgrading process may be executed easily under relatively low temperature condition due to the difference of heat capacity and thereby pressure gradient between coal and heating oil. This results in greatly reducing its energy cost. Drying tests of Indonesian lignite were performed with refined waste oil and B-C heavy oil, which were heated to 120°C, 130°C or 140°C. Following 10 min of treatment, the moisture content of the upgraded coal was improved from 32% to 2.0-3.2%, and its high heating value from 3,000 kcal/kg to 6,000 kcal/kg.
엄태인 한국산업안전학회 1994 한국안전학회지 Vol.9 No.4
A study is performed in order to design a effective ventilation equipment for the pollutants in workshop. The procedure has been used to calculate the flow in a confined rectangular space channel. A cross free stream is flowed from open space and jet stream including pollutants is injected from bottom area. Calculation results shows a wake region which exists immediately downstream of the jet discharge and are compared with the experimental data. Calculation data are in good agreement with experimental results. A wake plays an important role on a stagnation of the pollutants. Thus ventilation equipment has to be designed without a stagnation region which give rise to concentration stratification. In this study, calculation parameters are the position and velocity of pollutants and fresh air from cross free stream. It is concluded that more measurements of local velocities, temperatures and concentrations of the pollutants.
엄태인,채종성,성지선,전영남,황순모,김영석 한밭대학교 생산기반기술연구소 2004 생산기반기술연구소 논문집 Vol.5 No.1
A high proportion of hazardous (PVC, asbestos, chlorinated solvents) and infection wastes are treated in incinerators, the high temperature and high energy characteristics of plasma may be employed to convert waste materials into inert small volume products and combustible gases, plasma torch melting(PTM) is one of the most widely used tool for the vitrification of wastes. The ash product generated is of low bulk density and may also contain leachable quantities of toxic heavy metal and organic species. Plasma processing is able to treat these ashes, destroying any contained polyaromatic hydrocarbons components. Also we presented a steady three-dimensional model for a plasma melting furnace optimum designed in this study with RNG k-ε model, and its use in characterizing the structure of the flow field, temperature field and reaction field. Among various types of plasma torches, non-transferred hollow cathode type torch is best suited due to its long lifetime, easy power controllability and steady power output. Development of a plasma torch showed the lifetime longer than 300 hours and efficiency better than 65% And the various factors(electrode diameter, cooling flow rate and temperature and gas flow rate affecting the thermal efficiency of the torch) were experimentally evaluated.
대형 도시폐기물 소각로 개발을 위한 연소실내 유동장 해석 및 실험
엄태인 大田産業大學校 1996 한밭대학교 논문집 Vol.13 No.0201
A series of experimental and numerical simulation study are performed on the flow field in a model incinerator to a scale of 1/10 which is applied the similarity law for 300 tons municipal solid waste a day. In experiment, a five-hole Pilot tube is used for flow field, the thermocouple is used to measure a temperature field in order to check diffusion of the preheated secondary air and measure the main flow path in 1,2 combustion chamber. Also numerical calculations are made on the flow field and temperature field in model incinerator to improve the reliability of the experimental results and to analyze the flow field which is not measure in an experiment, in the primary combustion chamber. The direction of main flow is changed to the right and left according to the nozzle direction of the secondary air, in cold flow experiment. And the position and scale of the recirculation zone which is formed in the secondary combustion chamber, are varied. Therefore the primary air injection and the injection angle of the secondary air are important for design of incinerator. Though a role of the recirculation zone is different in the primary and secondary combustion chamber, it is important to design the incinerator with low pollutants in conformity to the combustion characters of solid wastes. And the results on the main flow pattern for the partial hot flow of the secondary air agree well with the results of the cold flow experiments. Therefore the injection angle of the secondary air has the key role on the main flow field. The results of a numerical simulation agree well qualitatively with the experimental data especially in the main flow direction, position and size of the recirculation zone for model incinerator. Therefore the experiment and calculation results of small scale incinerator can be applied to the design of incinerator with the reduced fly ash above the grate and the decision of injection angle of the secondary air.