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SF<sub>6</sub> 분해 및 무해화 시스템의 개념 설계 및 운영 결과
이중원,김미영,안지호,변영환,Joongwon, Lee,Miyeong, Kim,Jiho, Ahn,Younghwan, Byun Korea Electric Power Corporation 2022 KEPCO Journal on electric power and energy Vol.8 No.2
SF<sub>6</sub> is used as an insulating gas because of its excellent electrical insulation properties, non-toxicity, and non-inflammability. On the other hand, the global warming potential of SF<sub>6</sub> is 23,900 times higher than that of CO<sub>2</sub>. The Korea electric power cooperation (KEPCO) is responsible for 80% of the domestic SF<sub>6</sub> usage, and approximately 6,000 tons are currently charged in electrical and power facilities. KEPCO will gradually replace the insulating gas with SF<sub>6</sub>-free gas from 2023. SF<sub>6</sub> decomposition facilities are required because more than 60 tons of SF<sub>6</sub> will need to be disposed of annually from existing equipment. This study developed a novel decomposition and pollution control system that can process 60 tons of SF<sub>6</sub> per year. This facility can decompose more than 97.7% of SF<sub>6</sub>, with the emissions of hazardous and toxic materials below the legal limit.
Particle Image Velocimetry (PIV)를 이용한 딱정벌레목 곤충의 날갯짓 연구
유용훈(YongHoon Yoo),김지훈(Jihoon Kim),변도영(Doyoung Byun),홍영선(Youngsun Hong),박훈철(Hooncheol Park),변영환(YoungHwan Byun),김성균(SungKyun Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
To investigate the characteristics of Coleopteran insects flapping, this research is considered. Flow visualization around the wing of beetles is conducted by PIV (Particle imaging velocimetry) method. As a results, at the middle of up-stroke and down-stroke, velocity fields are calculated by PIV. Also using simple calculation program, vorticity fields are analyzed. Vortices generated by previous strokes are found around the wing.
활성탄 담지 Co-B/C, Co-P-B/C 촉매를 이용한 NaBH<sub>4</sub> 가수분해 반응
오소형 ( Sohyeong Oh ),김유겸 ( Youkyum Kim ),배효준 ( Hyojune Bae ),김동호 ( Dongho Kim ),변영환 ( Younghwan Byun ),안호근 ( Ho-geun Ahn ),박권필 ( Kwon-pil Park ) 한국화학공학회 2018 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.56 No.5
Sodium borohydride, NaBH<sub>4</sub>, shows a number of advantages as hydrogen source for portable proton exchange membrane fuel cells (PEMFCs). Properties of NaBH4 hydrolysis reaction using activated carbon supported Co-B/C, Co-P-B/C catalyst were studied. BET surface area of catalyst, yield of hydrogen, effect of NaBH<sub>4</sub> concentration and durability of catalyst were measured. The BET surface area of carbon supported catalyst was over 500 m<sup>2</sup>/g and this value was 2~3 times higher than that of unsupported catalyst. Hydrogen generation of activated carbon supported catalyst was more stable than that of unsupported catalyst. The activation energy of Co-P-B/C catalyst was 59.4 kJ/mol in 20 wt% NaBH<sub>4</sub> and 14% lower than that of Co-P-B/FeCrAlloy catalyst. Catalyst loss on activated carbon supported catalyst was reduced to about 1/3~1/2 compared with unsupported catalyst, therefore durability was improved by supporting catalyst on activated carbon.