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디젤자동차용 SCR 촉매의 저온영역에서 NOx 정화율 개선
서충길(C.-K. Seo),김화남(H. N. Kim),최병철(B. C. Choi),이천환(C. H. Lee),오광철(G. C. Oh),이춘범(C. B. Lee) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
The purpose of this paper is to perform the optimum contents of ZrO₂ with a promoter to improve NOx reduction activity of a Cu-ZSM-5 catalyst in low temperature below 300℃. NOx conversion of ZrO₂(2wt%) improved to 10∼20% in the temperature range from 200℃ to 300℃ compared to no ZrO₂ loaded SCR catalyst. It is because the NH₃ absorption was improved by acidity strengthening of acid sites of SCR catalyst as well as the improvement of thermal stability by a resonable ZrO₂ loading. The LOT(light-off temperature) 50 of Cu-ZSM-5/ZrO₂(2wt%) appeared at 180℃ that was decreased about 50℃ compared with Fe-Zeolite catalyst. The maximum NOx conversion of Cu-ZSM-5/ZrO₂(2wt%) was obtained 93% at 300℃, however that of Fe-zeolite catalyst was 88% at 350℃.
농업부산물 바이오매스의 온도별 질량감소에 따른 반탄화(torrefaction) 수율 예측 및 특성분석
주영민 ( Ju Y. M. ),조라훈 ( L. H. Cho ),이서현 ( S. H. Lee ),박선용 ( S. Y. Park ),정인선 ( I. S. Jeong ),이상열 ( S. Y. Lee ),이충건 ( C. G. Lee ),주상연 ( S. Y. Joo ),김대현 ( D. H. Kim ),오광철 ( K. C. Oh ) 강원대학교 농업생명과학연구원(구 농업과학연구소) 2017 강원 농업생명환경연구 Vol.29 No.1
Recently, global warming and environmental pollution are accelerating because of the continuous use of fossil fuels. Energy sources from biomass are considered one of the possible solutions to overcome this problem. In this study, application of agricultural by-products as new bioenergy resources through torrefaction was investigated. Pepper stems were selected from among domestic agricultural by-products to perform this energy conversion process. The sample was crushed and separated (standard testing sieve) into particles of 2.36 mm or less. The selected materials were injected into a prototype capsule, and the experiment was repeated three times for 10 min at a reaction temperature of 200°C, 230°C, or 270°C for up to 40 min. Mass reduction was measured after 1 h of cooling to minimize rapid reaction with oxygen in the atmosphere. Frequency factor coefficients and activation energy of lignocellulosic biomass were investigated for simulation analysis. The reaction rate constants were derived from the experimental results, and mass reduction was predicted with respect to different temperatures through a simulation. The experimental results were in good agreement with the simulation values 0.95 of the correlation and 0.46 of the RMSE. It will be necessary to develop a model that includes dry moisture, particle size, and reactor shape, because these factors may have a significant influence on the torrefaction process.
강원대학교 내 PV 모듈 설치를 위한 적정부지 선정 및 연간에너지 생산량 예측
어승희 ( S H Euh ),오광철 ( K C Oh ),주영민 ( Y M Joo ),김대현 ( D H Kim ) 강원대학교 농업생명과학연구원(구 농업과학연구소) 2013 강원 농업생명환경연구 Vol.25 No.2
농업생명과학대학 2호관은 박공지붕으로 인한 가대의 설치가 제외되어 투자회수 기간이 3.22년으로 산출되었고, 여타 대학은 평지붕의 가대 설치비가 포함되어, 투자 회수기간이 3.6년으로 나타났다. PV 모듈의 설치 수명이 25-30년임을 고려할 때 시설 투자가 적합한 것으로 판단 된다. 향후, 각 건물의 옥상 외에도 대운동장, 의과대학운동장, 학군단운동장 관중석 등의 지붕 상단의 설치, 태양광발전 가로등 설치, 고층 건물(60주년기념관, BTL) 및 고지대에 위치한 건물에 BIPV 설치, 차량출입관리소(정문, 후문, 동문) 지붕 상단 설치, 산책로 주변 설치, 주차장 지붕 설치 등이 고려되어 PV 모듈의 미이용 공간의 활용에 대한 다각적 검토가 요구되고, 더불어 여타 신재생에너지 이용 시스템의 적용 가능성 연구 또한 필요한 것으로 판단된다. Rising oil prices and greenhouse gas emissions have led to exploring of renewable energy. Solar energy has been identified as one of the most dominant sources of energy alternating fossil fuels. Energy consumption and greenhouse gas emissions from the universities in Korea have been increased gradually so that reduction of both is being required by using renewable energy systems. The annual energy yield prediction and suitable area investigation for installing PV module was performed in Kangwon National University (KNU). Based on the study results, College of Agriculture and Life Sciences 2 in KNU has a inclined rooftop with the angle of 33° facing south which is suitable for installing PV modules without frames. Investment payback period was calculated as 3.22 years. Other buildings has a flat roof, so investment payback period was computed as 3.60 years. Furthermore, multilateral study in terms of the unused spaces and an application validity of other renewable energy systems needs to be performed.
원형관-평판휜 형상의 밀집형 열교환기를 이용한 온실의 냉각 해석 모델 개발 및 검증
조라훈 ( Cho L. H. ),이서현 ( S. H. Lee ),박선용 ( S. Y. Park ),김진명 ( J. M. Kim ),이상열 ( S. Y. Lee ),이충건 ( C. G. Lee ),주상연 ( S. Y. Joo ),오광철 ( K. C. Oh ),김대현 ( D. H. Kim ) 강원대학교 농업생명과학연구원(구 농업과학연구소) 2016 강원 농업생명환경연구 Vol.28 No.3
In summer, cooling is needed because excessive temperature inside greenhouse increase causing a negative influence on the growth of crops in Korea. In this study, mathematical model predicting the temperature change in the greenhouse was developed through numerical analysis concerning solar radiation and heat exchange between inflow air and heat exchanger and then verification of the simulation was performed with the experimental data. For the cooling experiment, a pilot scale greenhouse was built, a duct and a cooling fin and a fan were installed for inflow of the air for reducing temperature. Numerical analysis for predicting temperature change in the greenhouse was done by simulation using Matlab (R2016a, The Mathworks INC, USA). When the experimental results was compared with the numerical simulation values, R-squared and RMSE (root mean square error) were showed 0.9502, 0.7081, respectively. It was showed that predicting temperature change inside the greenhouse was good agreement with the experimental result.