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전영남(Young Nam Chun),임문섭(Mun Sup Lim),조대영(Dae Young Jo) 大韓環境工學會 2015 대한환경공학회지 Vol.37 No.11
폐기물을 고체재생연료(SRF: Solid Refuse Fuel) 에너지로 전환하는 것은 화석에너지의 대체효과는 물론 온실가스 저감에도 기여한다. 그러나 플라스틱이 많이 함유한 SRF의 직접연소의 경우 검뎅(soot), 다이옥신 등의 생성문제가 있으므로 열분해/가스화 처리의 적용이 효과적이다. 본 연구에서는 플라스틱이 다량 함유된 SRF를 열분해 가스화의 특성을 파악하여 새로운 형태의 열분해 가스화 처리장치 개발을 위한 열적 기본자료을 제공하고자 한다. 이를 위해 새로이 벤치규모의 장치 를 설계ㆍ제작하여, 설정된 일정 온도에서 공기비 변화에 대한 가스, 타르, 촤 생성특성에 대해 규명하였다. SRF 샘플 2 g, 가 스화 공기비 0.691, 홀딩시간(Holding time) 32분일 때, 생성가스는 H₂ 1.36%, CH₄ 2.18%, CO 1.88%, Cl₂ 15.9 ppm, HCl 26.4 ppm로 생성되었으며, 중량타르(Gravimetric tar) 18 g/Nm3와 경질타르는 Benzene 4.03 g/m3, Naphthalene 0.39 g/m3, Anthracene 0.11 g/m3, Pyrene 0.06 g/m3 그리고 촤는 0.29 g 생성되었다. Waste energy conversion to SRF (Solid Refuse Fuel) has the effects not alternative fossil fuel usage but also the reduction of greenhouse gas. But the direct burning of the SRF including a plastic waste generates air pollution problem like soot, dioxin, etc. so that an application of pyrolysis and gasification treatment should be needed. The purpose of this study is to supply a basic thermal data of the pyrolysis gasification characteristics in the plastic-rich SRF which are needed for developing the novel pyrolyser or gasifier. To do so, a bench-scale test rig was newly engineered, and then experiments were achieved for the production characteristics of gas, tar, and char. While SRF sample, gasification air ratio, holding time changed as 2 g, 0.691, 32 min respectively, the H₂ 1.36%, CH₄ 2.18%, CO 1.88%, Cl₂ 15.9 ppm, HCl 6.4 ppm were composed. Also light tar benzene 4.03 g/m3, naphthalene 0.39 g/m3, anthracene 0.11 g/m3, pyrene 0.06 g/m3, gravimetric tar 18 g/m3, and char 0.29 g was formed.
워터젯 글라이딩 아크 플라즈마에 의한 사불화탄소 제거에 미치는 운전변수의 영향
전영남 ( Young Nam Chun ),이채홍 ( Chae Hong Lee ) 한국공업화학회 2011 공업화학 Vol.22 No.1
사불화탄소(CF4)는 반도체 제조공정에서 플라즈마 에칭과 화학기상증착(CVD)에서 사용되어온 가스이다. CF4는 적외선을 강하게 흡수하고 대기 중 잔류시간이 길어서 지구온난화에 영향을 미치기 때문에 고효율의 분해가 필요하다. 본 연구에서는 플라즈마와 워터젯을 결합하여 방전영역을 증가시키고 다량의 OH 라디칼을 생성시켜 CF4를 고효율로 분해할 수 있는 워터젯 글라이딩 아크 플라즈마 시스템을 개발하였다. 실험 변수로 전극 형태, 전극 각도, 가스 노즐 직경, 전극 간격과 전극 길이를 취하였다. 변수실험을 통하여 Arc 형태의 전극에서 전극 각도가 20°, 가스 노즐 직경이 3mm, 전극 간격이 3mm, 전극 길이가 120mm일 때 CF4 분해율은 최고 93.4%까지 도달하였다. Poly[2,3-dimethyl-5,8-dithiophene-2-yl-quinoxaline-alt-9,9-dihexyl-9H-fluorene] (PFTQT) and poly[2,3-dimethyl-5,8-dithiophen- 2-yl-quinoxaline-alt-10-hexyl-10H-phenothiazine (PPTTQT) based on 2,3-dimethyl-5,8-dithiophen-2-yl-quinoxaline were synthesized by Suzuki coupling reaction. All polymers were soluble in common organic solvents such as chloroform, chlorobenzene, o-dichlorobenzene, tetrahydrofuran (THF) and toluene. The maximum absorption wavelength and band gap of PFTQT were 440 nm and 2.30 eV, and PPTTQT were 445 nm and 2.23 eV, respectively. The HOMO and LUMO energy level of PFTQT were -6.05 and -3.75 eV, and PPTTQT were -5,89 and -3.66 eV, respectively. The organic photovoltaic devices based on the blend of polymer and PCBM (1:2 by weight ratio) were fabricated. Efficiencies of devices were 0.24% (PFTQT) and 0.16% (PPTTQT), respectively. The short circuit current density (Jsc), fill factor (FF), and open circuit voltage (Voc) of the device with PFTQT were 0.97 mA/cm2, 29% and 0.86 V, and the device based on PPTTQT were 0.80 mA/cm2, 28% and 0.71 V, 31% and 0.71 V, respectively, under air mass (AM) 1.5 G and 1 sun condition (100 mA/cm2).
스마트팜 적용 컨테이너 내 CO2 공급 및 환기팬 배치에 따른 유동 패턴 및 농도분포 CFD 해석
전영남 ( Young-nam Chun ) 한국환경기술학회 2022 한국환경기술학회지 Vol.23 No.6
The problem of climate change due to global warming is negatively affecting the production and quality of crops. Container farms can be an alternative to solving the problem of growing crops due to the climate change. Therefore, a numerical study was preformed for the vertical container farm as the carbon dioxide utilization (CCU) technology. CFD numerical analysis was performed on the internal fluid flow pattern and concentration distribution related to the supply of carbon dioxide and air ventilation to the inside of the container. In addition, a parametric study was conducted for each variable on the change in the concentration of the CO<sub>2</sub> injector and the velocity change of the air fan. The case of where the CO<sub>2</sub> injector is located at the upper inlet, the air fan is located at the bottom, and the exhaust fan is located at the upper part of the outlet, was best situation for the CO<sub>2</sub> distribution. In this case, the CO<sub>2</sub> concentration in the container was 500-800 ppm which is good condition for tomatoes, melons, and strawberries. In addition, when the CO<sub>2</sub> concentration of the CO<sub>2</sub> injector is reduced, the concentration in the container is lowered, so it is not suitable for growing crops that require a lot of high CO<sub>2</sub>. When the velocity of the air fan was reduced, the CO<sub>2</sub> concentration was too high due to ventilation and mixing problems which is expected a problem in crop cultivation. The results should be well known that in order to maintain a uniform CO<sub>2</sub> concentration in a container, the container size and internal shelf arrangement, as well as the arrangement and conditions of the CO<sub>2</sub> injector, air fan, and exhaust fan, are very important factors.
전영남(Young Nam Chun),김은혁(Eun Hyuk Kim),임문섭(Mun Sup Lim),천우일(Woo Il Cheon) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
Volatile organic compounds (VOCs) are gases with low calorific values produced from the painting or drying process whose stable combustion cannot be ensured by direct combustion. In this study, a plasma dump combustor was proposed to remove a representative VOC, toluene, after the desorption of VOCs from the painting process via adsorption and concentration. The three-phase gliding arc plasma and dump combustor were combined. The system treated VOCs with a stable flame due to the plasma, and strong oxidative power due to the high-energy free electrons and diverse radicals. Mass treatment was possible using the dump combustor. The toluene reduction characteristic was examined according to the total gas feed, electric supply, and 3D matrix heat accumulator. When the dump injector was placed inside and a 3D matrix was installed at a 180 L/min gas injection rate, 100.7 W electric power, and 3000 ppm injection concentration, the toluene decomposition efficiency was 99.5%, and the energy efficiency was 447.2g(kWh)<SUP>-1</SUP>, which was the highest.