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손성렬,이시훈,김상돈 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.1
The chemical-looping combustion (CLC) process has an advantage of no energy loss for CO2 separation without NOx formation. This process consists of an oxidizer in the riser section and a reducer in the downcomer section of a circulating fluidized bed reactor that has excellent gas-solid mixing characteristics. However, it has inherent particle attrition problems in operation. The attritionsof each metal oxides particles were determined in an attrition tester (ASTM D5757-95): attrition tube (0.035 m-ID, 0.071 m-height) and settling chamber (0.11 m-ID, 0.63 m-height), and the particulate collected in a flask at the top part of the tester was weighed. The obtained attrition data was analyzed in terms of the attrition index (AI) and the corrected attrition index (CAI). The particleswere characterized by SEM image and particle size distributions. The values of AI and CAI are found to be 0 - 62.50 and 0 - 23.61, respectively. The metal oxides particles supported on TiO2 and Al2O3 exhibit good resistance, but those on bentonite do not have good resistance against attrition. The optimum condition for good resistance against attrition of NiO-Fe2O3/bentonite particles is found to be around NiO:Fe2O3 = 3:1.
손성렬,김상돈 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.1
Hydrogen production from water is one of the most important long-term goals for future energy resources. Hydrogen production from the direct thermochemical water splitting reaction is rather simple without any by-products. The metal oxides redox pair of Fe3O4/FeO system was selected in the simple two-step water splitting cycles since the system has suitable thermodynamic compatability and its price. To overcome the temperature problem and improve fluidization quality in a fluidized bed, MnO, ZnO, and Nb2O5 were added to iron oxides by the solid phase method. The characteristics of those powders were analyzed by SEM, EDS, XRD, ICP and N2-BET, respectively. In addition, attritions of each metal oxides particles were determined in the attrition tester (0.035 m- ID, 0.071 m-height) based on the ASTM D5757-95. The particulate collected in a flask at the top part of the tester was weighed to determine the attrition index. The obtained attrition data were analyzed in terms of the attrition index (AI) and the corrected attrition index (CAI). The particles were characterized by SEM image and its size distributions.
열화학적 유동층 물 분해를 위한 금속 산화물 입자 제조
고강석,손성렬,김상돈 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.2
최근 화석 연료의 대체 연료로 연료 전지와 같은 신 에너지 시스템의 에너지원으로 수소의 중요성과 필요성이 증대되고 있다. 특히 물을 분해하여 수소를 얻는 방식은 경제적으로나 환경적으로 국제 에너지 수급에 있어서 중요한 목표로 설정되어 그 연구가 진행되고 있다. 본 연구에서는 열 화학적 물 분해 방식에 의한 수소 제조에 있어 수소의 대량 생산이 가능하도록 유동 층반응기에서 매체 물질로 이용될 금속 산화물 입자를 제조하였다. 유동 층 조건에 이용되기 위해서 금속 산화물 입자는 높은 산소 공여 성능, 내마모성, 열적 안정성 등이 요구된다. 본 실험에서는 산화/환원 성능이 우수한 MnFe2O4 (manganese ferrite)입자를 고상 법으로 제조하는 과정에서 입자의 특성을 개선하기 위하여 첨가제로써 NaCl 염 첨가 방법을 사용하였다. 제조된 입자의 특성은 XRD, SEM, N2-BET, 마모테스트를 통하여 분석하였고, 열 천칭 중량분석, TGA 분석을 통하여 입자의 성능을 평가하였다. 입자 제조에 NaCl 염의 첨가로 ferrite를 형성하기 위한 반응온도가 기존 방식에 비해 대략 150~200℃정도 낮아졌으며, 열 화학적 물 분해 성능과 직접 관계되는 입자의 비표면적도 커지는 효과를 나타내었다.
고인성시멘트복합체와 재생콘크리트로 구성된 하이브리드 보부재의 전단성능에 관한 실험적 연구
안현진(An Hyun-Jin),정대호(Jeong Dae-Ho),손성렬(Son Seong-Yeol),장민(Jang Min),문연준(Moon Youn-Joon),김순철(Kim Soon-Chul),양일승(Yang Il-Seung) 대한건축학회 2007 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.27 No.1
The objective of this investigation is to study the elasto-plastic behavior of concrete beams using precast ductile fiber reinforced cementitious composites(DFRCCs) from-work and aggregate concrete subjected to vertical load. The hybrid beam, which DFRCCs is filled with concrete, expected to raises durability of concrete. The specimens are assorted beams using DFRCCs form-work, DFRCCs beams using PolyVinyl Alcohol fibers, recycled aggregate concrete beam and general reinforced concrete beam. The length of specimens is 1920㎜, the section is 170×270(㎜), the thickness of the DFRCCs form is 35㎜, the main bar is D16, the tie bar is D6. The research results clearly showed that the proposed hybrid beam showed stable hysterisis behaviors than classical concrete beam.