Overseas demonstration and business model development of 6MW_th class tri-generation plant with unused renewable fuel based on modularzation

안성율 한국폐기물자원순환학회 2023 한국폐기물자원순환학회 심포지움 Vol.2023 No.1

유한요소법을 이용한 붕적층 내 강지보재(H-형강)로 보강된 터널의 거동해석

안성율,박영택,유병옥,유찬 경상대학교 농업생명과학연구원 2007 농업생명과학연구 Vol.41 No.4

직접탄소 연료전지에서 RDF 및 RPF의 전기화학반응 특성에 관한 실험적 연구

안성율,이영훈,엄성용,성연모,문철언,강기중,최경민,김덕줄 한국수소및신에너지학회 2012 한국수소 및 신에너지학회논문집 Vol.23 No.5

The electrochemical reaction of refuse derived fuel (RDF) and refuse plastic/paper fuel (RPF) was investigated in the direct carbon fuel cell (DCFC) system. The open circuit voltage (OCV) of RPF was higher than RDF and other coals because of its thermal reactive characteristic under carbon dioxide. The thermal reactivity of fuels was investigated by thermogravimetric analysis method. and the reaction rate of RPF was higher than other fuels. The behavior of all sample’s potential was analogous in the beginning region of electrochemical reactions due to similar functional groups on the surface of fuels analyzed by X-ray Photoelectron Spectroscopy experiments. The potential level of RDF and RPF decreased rapidly comparing to coals in the next of the electrochemical reaction because the surface area and pore volume investigated by nitrogen gas adsorption tests were smaller than coals. This characteristic signifies the contact surface between electrolyte and fuel is restricted. The potential of fuels was maintained to the high current density region over 40 mA/cm2 by total carbon component. The maximum power density of RDF and RPF reached up to 45~70% comparing to coal. The obvious improvement of maximum power density by increasing operating temperature was observed in both refuse fuels.

붕적층 지반에 적용된 터널에서 강재의 지보효과에 대한 연구

안성율,이재영,안경철,Ahn, Sung-Youll,Lee, Jae-Young,Ahn, Kyung-Chul 한국터널지하공간학회 2006 터널기술 Vol.8 No.1

최근 부각되고 있는 환경친화적인 설계의 결과로서 터널 입출구의 구조물이 연약한 지반(붕적층) 에 불가피하게 건설 되곤 한다. 그런 터널 공사의 경우, 주변 지반뿐만 아니라 라이닝 지보재의 충분한 지지력을 확보해야 한다. 이와 관련하여, 높은 강성을 갖는 H형 강지보재가 라이닝을 지지하기 위해 흔히 사용되었다. 그러나 수치해석에 의한 구조적인 안정성을 평가하는데 있어서 그 효과는 무시되는 젓이 관례였다. 본 연구에서는 붕적층에 적용된 터널에 대하여 강지보재로 사용된 H형강을 수치해석 모델에서 강성 적용을 0%, 50%, 75%, 100%로 반영하여 3차원 유한요소해석을 수행하였고, 각 강성 적용율에 따른 숏크리트 용력 감소효과를 비교 검토하였다. 수치해석으로부터 얻어진 데이터는 현장계측결과와 비교하였다, 연구 결과로부터 강지보재의 숏크리트에 대한 효과가 검증되었고 적절한 강성률은 50~75%의 범위 내에서 적절한 것으로 판단되었다. The entrance and the exit structures of tunnels are often constructed on unfavorably soft soils (colluvial soils) as a result of environment-friendly design highlighted in recent years. For construction of such a tunnel, it is essential to secure sufficient bearing capacity of the lining supports as well as that of the surrounding soils. In this regard, H-shape steel-ribs with high stiffness are commonly used for lining supports. However, it was the past convention to ignore the effect of the steel-ribs in numerical evaluation of the structural safety. This study is intended to show how the shotcrete stresses are relieved by the steelribs, on the basis of numerical data obtained from 3-dimensional finite element analysis. The effect of steel ribs to shotcrete stresses is examined at different levels of application rates, i.e., 0%, 50%, 75% and 100% of the total stiffness. The data obtained from numerical analysis was compared with in-situ measurement. The effect of st eel ribs to shotcrete stresses was verified and appropriate total stiffness was proposed in the range of 50%~75%.

바이오 드라잉, 반탄화 및 디지털트윈 기술개발

안성율,김현욱 한국폐기물자원순환학회 2022 한국폐기물자원순환학회 심포지움 Vol.2022 No.1

붕적층 지반에 적용된 터널에서 강재의 지보효과에 대한 연구

안성율,이영재,안경철 사단법인 한국터널지하공간학회 2006 한국터널지하공간학회논문집 Vol.8 No.1

The entrance and the exit structures of tunnels are often constructed on unfavorably soft soils (colluvial soils) as a result of environment-friendly design highlighted in recent years. For construction of such a tunnel, it is essential to secure sufficient bearing capacity of the lining supports as well as that of the surrounding soils. In this regard, H-shape steel-ribs with high stiffness are commonly used for lining supports. However, it was the past convention to ignore the effect of the steel-ribs in numerical evaluation of the structural safety. This study is intended to show how the shotcrete stresses are relieved by the steel ribs, on the basis of numerical data obtained from 3-dimensional finite element analysis. The effect of steel ribs to shotcrete stresses is examined at different levels of application rates, i.e., 0%, 50%, 75% and 100% of the total stiffness. The data obtained from numerical analysis was compared with in-situ measurement. The effect of steel ribs to shotcrete stresses was verified and appropriate total stiffness was proposed in the range of 50%~75%. 최근 부각되고 있는 환경친화적인 설계의 결과로서 터널 입출구의 구조물이 연약한 지반(붕적층)에 불가피하게 건설되곤 한다. 그런 터널 공사의 경우, 주변 지반뿐만 아니라 라이닝 지보재의 충분한 지지력을 확보해야 한다. 이와 관련하여, 높은 강성을 갖는 H형 강지보재가 라이닝을 지지하기 위해 흔히 사용되었다. 그러나 수치해석에 의한 구조적인 안정성을 평가하는데 있어서 그 효과는 무시되는 것이 관례였다. 본 연구에서는 붕적층에 적용된 터널에 대하여 강지보재로 사용된 H형강을 수치해석 모델에서 강성 적용을 0%, 50%, 75%, 100%로 반영하여 3차원 유한요소해석을 수행하였고, 각 강성적용률에 따른 숏크리트 응력 감소효과를 비교 검토하였다. 수치해석으로부터 얻어진 데이터는 현장계측결과와 비교하였다. 연구 결과로부터 강지보재의 숏크리트에 대한 효과가 검증되었고 적절한 강성률은 50~75%의 범위 내에서 적절한 것으로 판단되었다.

건축물 말뚝기초 내진설계 최근 연구동향

안성율,정경식 한국지반환경공학회 2022 지반환경 Vol.23 No.2

지하굴착시 지하수 저하로 인한 침하해석 실무

안성율,이창노,장재원,정재호,정경식,An, Seong-Yul,Lee, Chang-No,Jang, Jae-Won,Jeong, Jae-Ho,Jeong, Gyeong-Sik 한국터널지하공간학회 2021 자연, 터널 그리고 지하공간 Vol.23 No.3

배출수 재순환에 따른 디샌더 내부 유동 변화 CFD 해석

안성율,성호진,장지웅,정인식 (사)한국환경에너지공학회 2023 열환경공학 Vol.18 No.2

The transition from carbon-based to hydrogen-based industries is now started to correspond to greenhouse gas regulations, but these changes cause economic problems. To cover the problem, it takes many times. So, efficiently utilizing the existing carbon-based industry is still important with eco-technologies. Moreover, it is also important concern to secure energy resources. Shale oil technology is one of the ways to solve the resource depletion problem, and many studies are being conducted. Desander is an important part in the process to protect major machines. In this study, the discharged liquid of a desander is sprayed directly to the lower end of the cyclone to enhance internal vortex formation and particle separation efficiency. The flow inside of the desander would be changed by the recirculated liquid and it has been analyzed by means of numerical investigation. The analysis results show that when the discharged liuid is recirculated, the internal vortex is more reliably formed comparing to non-recirculated case. This phenomenon improves the separation efficiency of solid particles at the boundary layer between the external vortex and the internal vortex. However, when the discharged water above a certain level is recycled, the region of the internal vortex occupies too large an area in the inner flow of the cyclone, which adversely affects the formation and particle separation process of the external vortex.

Effect of devolatilization model on flame structure of pulverized coal combustion in a jet-burner system

안성율,Hiroaki Watanabe,Toshiaki Kitagawa 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.4

A numerical simulation was performed with the two competing model in the devolatilization process for a pulverized coal combustion jet flame by means of LES. The target was a simple jet burner flame in CRIEPI. To solve the LES equations, a CFD code FFR. Comb was employed with the dynamic Smagorinsky SGS turbulent model. A simple global kinetic mechanism was implemented to predict combustion of the gas and solid phase combustion. The interactions between the two phases were calculated by PSI-Cell model while the reaction rate in turbulent flow was established by SSFRRM. The simulation was validated by comparing results to the experimental data in terms of particle dispersion and velocity as well as gaseous velocity. The flame structure was discussed with temperature, mole fraction of major species. In addition, the effect of the devolatilization model was investigated simultaneously by comparing to another simulation that employed the single first order reaction model because the devolatilization was one of the major processes in coal combustion and it had an influence on the flame structure from all reactive regions. The release rate was calculated by two different parameter sets in the Arrhenius rate equation for the two competing model that were corresponding different temperature regions whereas the released rate was determined by only one fixed parameter set in the single first order reaction model. From the simulation, it was revealed that the main reactions took place at the upstream and the first fuel oxidation was stronger at the inner reaction zone comparing to the far side combustion. It was confirmed as well that the two competing model could capture the quick devolatilization faster than the single first order reaction model though the dominant part appeared later than the single first order reaction model.