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Eom, Tae Hyoung,Lee, Joong Beom,Baek, Jeom In,Ryub, Chong Kul,Rhee, Young Woo Korea Electric Power Corporation 2015 KEPCO Journal on electric power and energy Vol.1 No.1
$K_2CO_3$-based dry regenerable sorbents were prepared by spray-drying techniques to improve mass produced $K_2CO_3-Al_2O_3$ sorbents (KEP-CO2P, hereafter), and then tested for their $CO_2$ sorption capacity by a $2,000Nm^3/h$ (0.5 MWe) $CO_2$ capture pilot plant built for Unit 3 of the Hadong thermal power station in 2010. Each of the sample sorbents contained 35 wt.% $K_2CO_3$ as the active materials with various support materials such as $TiO_2$, MgO, Zeolite 13X, $Al_2O_3$, $SiO_2$ and hydrotalcite (HTC). Their physical properties and reactivity were tested to evaluate their applicability to a fluidized-bed or fast transport-bed $CO_2$ capture process. The $CO_2$ sorption capacity and percentage utilization of $K_2CO_3$-MgO based sorbent, Sorb-KM2, was $8.6g-CO_2/100g$-sorbents and 90%, respectively, along with good mechanical strength for fluidized-bed application. Sorbs-KM2 and KT were almost completely regenerated at $140^{\circ}C$. No degradation of Sorb-KM by $SO_2$ added as a pollutant in flue gas was observed during a cycle test.
연소전 CO<sub>2</sub> 회수를 위한 고체 흡수제 및 WGS 촉매 특성 평가
엄태형(Eom, Tae Hyoung),이중범(Lee, Joong Beom),박근우(Park, Keun Woo),최동혁(Choi, Dong Hyuk),백점인(Baek, Jeom-In),류청걸(Ryu, Chong Kul) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.06
석탄가스화복합발전(IGCC: Integrated Gasification Combined Cycle)의 고온 고압 합성가스로부터 CO₂를 저비용으로 포집하기 위한 연소전 포집 기술 중 유동층 촉진수성가스전환(SEWGS) 공정이 제안되어 연구개발 중에 있다. 연소전 CO₂ 포집을 위한 SEWGS 공정은 동일한 2탑 순환 유동층 반응기에서 고온 고압의 합성가스(H₂, CO)를 유동층 WGS 촉매를 사용하여 CO를 CO₂로 전환하는 동시에 전환반응으로 생성된 CO₂를 흡수제를 이용하여 포집하는 기술이다. 본 연구는 CO₂ 회수와 WGS 반응이 동시에 이루어지는 공정에 적용 가능한 건식 재생 흡수제 및 유동층 WGS 촉매 개발을 목표로 CO₂ 흡수제(P Series) 및 WGS 촉매(PC Series) 조성을 제안하고 분무건조기를 이용하여 6~8kg/batch로 성형 제조하였다. 제조된 CO₂ 흡수제 및 촉매의 특성 평가 결과 내마모도(Attrition resistance)를 포함한 물리적 특성이 유동층 공정의 요구조건을 만족하는 결과를 얻을 수 있었다. 또한, 모사 석탄 합성가스를 이용하여 20bar, 200?C 흡수/400?C 재생 조건에서 열중량 분석기(TGA) 및 가압 유동층(Fluidized-bed) 반응기를 통한 흡수제의 CO₂ 흡수능 평가를 수행하였다. 그 결과 내마모도(AI) 3% 이하로 기계적 강도가 우수하며, CO₂ 흡수능 17.6 wt%(TGA) 및 11wt%(가압 유동층)를 나타냈다. 유동층 WGS 특성 평가 결과 내마모도가 7~35%로 우수하였고, CO 전환율은 200?C에서 80% 이상으로, 유동층 SEWGS 공정에 적용 가능한 특성을 확인하였다.
Fe<sub>3</sub>O<sub>4</sub> 생성에 미치는 황산제일철/황산제이철 몰비와 침전제의 영향
엄태형(Tae Hyoung Eom),김삼중(Sam Joong Kim),안석진(Suk Jin An),오경환(Kyoung Hwan Oh),서동수(Dong Soo Suhr) 한국자기학회 2011 韓國磁氣學會誌 Vol.21 No.5
The effect of ferrous/ferric molar ratio and precipitants on the formation of nano size magnetite particle was investigated by co-precipitation method. Ferrous sulfate and ferric sulfate were used as iron sources and sodium hydroxide and ammonium hydroxide was used as a precipitant. Single phase magnetite was synthesized with all of experiment conditions (ferrous/ferric molar ratios and precipitants). Particle size was smaller, and particle size distribution was narrower when NaOH was used than NH<sub>4</sub>OH was used. The crystallinity and particle size was increased and narrower particle size distribution with increasing molar ratio ferrous/ferric sulfate with the same precipitant. Super paramagnetism could be obtained at all of experiment conditions. The highest saturation magnetization (72 emu/g) was obtained when the ferrous/ferric molar ratio was 2.5 and precipitant was used NH<sub>4</sub>OH.
Flexural Test for Steel-Concrete Composite Members Using Prefabricated Steel Angles
Eom, Tae-Sung,Hwang, Hyeon-Jong,Park, Hong-Gun,Lee, Chang-Nam,Kim, Hyoung-Seop American Society of Civil Engineers 2014 Journal of structural engineering Vol.140 No.4
In the proposed composite [prefabricated steel-reinforced concrete (PSRC)] column, steel angles located at the corners of the cross section are weld connected with tie bars to provide a bond for the steel angles, shear resistance, and lateral confinement. In this paper, simply supported PSRC specimens were tested to investigate their flexural strength and ductility. For comparison, a conventional concrete-encased H-section specimen was also tested. The test parameters were the steel ratio of the angle section and the spacing of the tie bars. The flexural, shear, and bond strengths of the test specimens correlated well with predictions. The flexural strength and stiffness of the PSRC specimens were significantly greater than those of the conventional composite specimen with the same steel area. However, at large inelastic deformations, the PSRC specimens were vulnerable to the bond failure between the steel angle and concrete and the tensile fracture of the angle at the weld-connection to the tie bars. When the bond strength between the steel angles and concrete was greater than the demand, the PSRC specimens exhibited ductile behavior after flexural yielding.