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Yoon, Jonghyuk,Kim, Do-Yong,Kim, Daegi Elsevier 2018 waste management Vol.80 No.-
<P><B>Abstract</B></P> <P>In this study, a Computational Fluid Dynamics (CFD) to analyze the coastal waste particles in a wind-power sorting system is applied to produce renewable fuel using commercial CFD package (ANSYS-CFX code). The numerical methodology results predicted various coastal waste shredded inside the sorting machine. Furthermore, to identify the effect of working conditions on separation characteristics, a parametric study is performed. These study findings will offer appropriate a wind-power sorting conditions according to the purpose of using coastal waste. Under basic conditions, the characteristics of coastal waste particle behavior and the sorting of waste particles were analyzed, and the behavioral changes of diverse particles were identified by changing the airflow rate to improve the sorting performance. As a result, an appropriate airflow rate, Q<SUB>air</SUB> = 85 m<SUP>3</SUP>/min, at which the change in the airflow rate can simultaneously meet the conditions for both the recovery of the combustibles and the removal of the incombustibles, was selected with the selection efficiency rate was 92%, and the combustibles content was 99%. Based on the results of the analysis, the particle characteristics of sorting were identified to reduce and recycle the coastal waste.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Coastal waste has become a serious global problem in the marine environment. </LI> <LI> The producing solid fuel from the coastal waste is a representative example. </LI> <LI> To produce high-quality SRF, it is important to effectively sort out combustible. </LI> <LI> CFD result provided the prediction of behavior of waste particle in sorting machine. </LI> <LI> The particle characteristic of sorting identified to recycle the coastal waste. </LI> </UL> </P>
반도체 폐가스 처리용 가스 스크러버의 전열 반응기 내열유동특성에 관한 수치해석 연구
윤종혁(Jonghyuk Yoon),송형운(Hyoungwoon Song),김영배(Youngbae Kim) 대한기계학회 2019 대한기계학회 논문집. Transactions of the KSME. C, 산업기술과 혁신 Vol.7 No.1
반도체 산업의 발달과 더불어 반도체 생산공정에서 발생되는 다양한 종류의 폐가스 배출을 저감시키기 위한 관심이 집중되고 있다. 이러한 환경유해가스를 저감시키기 위한 장치로서 가스 스크러버 장치가 널리 사용되고 있으며 가스 스크러버 장치를 구성하고 있는 열분해 반응기의 성능향상을 위한 다양한 시도가 이뤄지고 있다. 본 연구에서는 수치해석기법을 기반으로 한 전산유체역학을 이용하여 열분해 반응기 내 열유동 특성을 예측하였고 실험과의 비교분석을 통하여 해석기법을 검증하였다. 온도결과에 대한 해석과 실험은 약 1.27~2.25% 수준의 오차를 보였으며 이를 통해 해석결과의 타당성을 확보하였다. 추가적으로 검증된 해석기법을 이용하여 운전조건 및 반응기 형상 변화에 따른 거동특성을 파악하였다. With a significant advance in a semiconductor industry, lots of interests have been concentrated on after-treatment system that purify waste gases produced from semiconductor manufacturing process. Currently, a scrubber system has been widely utilized as a after-treatment method for abating the waste gases and various works are being conducted to improve performance of electrical heating reactor, which is component of gas scrubber systems. In the present study, a numerical simulation has been performed using the commercial CFD code (Ansys CFX 17.0) to figure out the thermal and flow characteristics inside the decomposition reactor. In order to validate the numerical method herein, the numerical results of temperature are compared with the experimental data. The average error rates (1.27~2.27%) between those of results were achieved, and numerical results of temperature distribution showed good agreement with the experimental data. Using validated numerical method, the effect of operating conditions and the reactor geometry was also evaluated. The result of the present study can be useful information of the scrubber used in many kinds of industries.
반도체 폐가스 처리용 열분해반응기의 입구형상이 열유동 특성에 미치는 영향에 관한 수치해석 연구
윤종혁 ( Jonghyuk Yoon ),김영배 ( Youngbae Kim ),송형운 ( Hyungwoon Song ) 한국공업화학회 2018 공업화학 Vol.29 No.5
최근에 반도체 산업의 지속적인 발전에 따라 반도체 생산공정에서 발생하는 다양한 오염가스를 처리하는 기술에 대한 관심도 늘어나고 있다. 이처럼 반도체 공정 후 배출되는 폐가스를 제거하는 장치 중의 하나로서 다양한 종류의 스크러버 시스템이 사용되고 있다. 이러한 스크러버 시스템 내 열분해반응기 성능은 폐가스 내 오염원 제거효율과 전반적인 운전안정성에 영향을 미치기 때문에 열분해 반응기의 효율적인 설계가 매우 중요하다. 본 연구에서는 수치해석 방법을 기반으로 반응기 내 폐가스의 열유동 특성을 파악하고자 하였다. 해석기법을 검증하기 위해 온도분포에 대한 해석결과를 실험결과와 비교하였다. 온도결과에 대한 해석과 실험은 약 1.27~2.25% 수준의 낮은 오차를 보였으며 이를 통해 해석결과의 타당성을 확보하였다. 검증된 해석기법을 이용하여, 기존 반응기의 성능개선을 위한 설계 가이드라인을 제시하기 위해 폐가스 형상 변화에 따른 해석을 수행하여 기존모델 및 수정모델에서 폐가스의 거동특성을 비교분석하였다. 본 연구에서 수행한 결과는 다양한 스크러버 시스템 내 열유동 특성을 분석하는데 기초자료로 활용될 수 있을 것으로 기대한다. Recently, lots of interests have been concentrated on the scrubber system that abates waste gases produced from semiconductor manufacturing processes. An effective design of the thermal decomposition reactor inside a scrubber system is significantly important since it is directly related to the removal performance of pollutants and overall stabilities. In the present study, a computational fluid dynamics (CFD) analysis was conducted to figure out the thermal and flow characteristics inside the reactor of wet scrubber. In order to verify the numerical method, the temperature at several monitoring points was compared to that of experimental results. Average error rates of 1.27~2.27% between both the results were achieved, and numerical results of the temperature distribution were in good agreement with the experimental data. By using the validated numerical method, the effect of the reactor geometry on the heat transfer rate was also taken into consideration. From the result, it was observed that the flow and temperature uniformity were significantly improved. Overall, our current study could provide useful information to identify the fluid behavior and thermal performance for various scrubber systems.
윤종혁(Jonghyuk Yoon),송형운(Hyoungwoon Song),정희숙(Jung Hee Suk),정석우(Seok Woo Chung) 한국열환경공학회 2019 한국열환경공학회 학술대회지 Vol.2019 No.춘계
Recently, there are lots of increasing interest in smart farming that represents application of modern Information and Communication Technologies (ICT) into agriculture. In order to obtain optimal geometry of smart greenhouse, various design parameters need to be evaluated. In the present study, the numerical simulation using a commercial Computational Fluid Dynamics (CFD) code was implemented to figure out the internal thermal-flow characteristics. In order to numerically model solar radiation that spread over a wide range of wavelengths, the multiband model that discretizes the spectrum into finite bands of wavelength based on Wien’s law is applied to the simulation. In addition, absorption coefficient of vinyl that is varied with the bands of wavelength is also applied based on Beer-lambert law. To validate the numerical method, the numerical results of the temperature at specific monitoring points were compared with the experimental data. The average error rates (12.2~14.2 %) between them was shown and numerical results are in good agreement with the experimental data. Additionally, effect of shape of roof windows on thermal-flow characteristics inside single-span green house was evaluated. The results of the present study can be useful information for the design of various greenhouses.
횡형 스크롤 압축기 내 오일 및 냉매 거동에 관한 수치해석 연구
윤종혁(Jonghyuk Yoon),허남건(Nahmkeon Hur),김명균(Paul Kiem),이규호(Kyu Ho Lee) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
Recently, horizontal scroll compressor is widely utilized in the various industry fields, due to the high efficiency and advantages of space occupancy. It is important to predict the behaviors of oil and refrigerants for evaluating OCR (Oil Circulation Rate) inside a horizontal scroll compressor. In the present study, two-phase flow of oil and refrigerants in the compressor were numerically investigated by using Eulerian method. In additions, since oil and refrigerant were circulated in the refrigeration cycle, inflow rate at inlet is determined by discharge flow rate at outlets. Thus, it is applied for boundary conditions in a way that oil and refrigerants come into the compressor as much as discharge flow rate. As a result, it is found that inflow rate and discharged rate became convergent when flow field was fully developed, and inside volume of oil and refrigerants in the compressor was also maintained. The proposed boundary condition at inlet to determine inflow rate can be used to predict behaviors of oil and refrigerants.