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산화칼슘을 이용한 합성가스내의 이산화탄소 분리반응 특성
Reaction Characteristics of CO2 Separation from a Syngas Using CaO
광운대학교 화학공학과, 서울 139-701 1광운대학교 환경공학과, 서울 139-701 2한국과학기술연구원 청정기술연구센터, 서울 136-791 3군산대학교 화학공학과, 군산 573-701 4한국에너지기술연구원 가스화활용연구팀, 대전 305-343
Department of Chemical Eng., Kwangwoon University, Seoul 139-701, Korea 1Department of Environmental Eng., Kwangwoon University, Seoul 139-701, Korea 2Clean Technology Research Center, Korea Institute of science and Technology, Seoul 136-791, Korea 3Department of Chemical Eng., Kunsan National University, Kunsan 573-701, Korea 4Gas Application Research Team, Korea Institute of Energy Research, Daejeon 305-343, Korea
HWAHAK KONGHAK, October 2002, 40(5), 582-587(6), NONE
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Abstract
가연성 폐기물 가스화반응으로 생성되는 합성가스내의 이산화탄소를 제거하기 위하여, 열중량 분석기와 고정층 반응기내 산화칼슘을 이용한 이산화탄소의 분리반응 특성을 고찰하였다. 산화칼슘과 이산화탄소의 반응은 생성층 확산율속 영역에서 수축핵 반응모델의 속도식과 잘 일치하였으며 반응차수와 활성화 에너지는 각각 1.95, 104 kJ/mol 이었다. 산화칼슘과 이산화탄소의 반응성은 반응압력이 증가하여도 크게 변화하지 않았으며 이는 산화칼슘의 기공크기가 크고 표면고체확산에 의하여 반응이 진행되기 때문으로 사료된다. 합성가스내의 수소와 일산화탄소의 존재는 700 ℃ 이상의 고온에서는 산화칼슘의 환원반응과 역수성가스반응에 의하여 이산화탄소 제거반응을 방해하지만 반응온도 600 ℃ 이하에서는 이산화탄소 제거반응에 영향을 주지 않았다.
Reaction characteristics of CO2 separation have been investigated in a thermogravimetric analyzer and packed bed reactor using CaO for the removal of CO2 in a syngas produced from the gasification of combustible wastes. Reactions of CaO with CO2 were fitted well by the rate equation of shrinking core model at the product layer diffusion control regime. Furthermore, the reaction order and the activation energy were found as 1.95 and 104 kJ/mol, respectively. Reaction rates of CaO does not increases with the increase of operating pressures, which might be because CaO has macropores in the particle inside and reaction is carried out by the surface solid diffusion. The presence of H2 and CO inhibits the CO2 removal reaction by the water gas shift reaction and reduction of CaO above the temperature of 700 ℃. On the other hand, the CO2 removal reaction was not affected below 600 ℃.
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References
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Epling WS, Hoflund GB, Minahan DM, J. Catal., 175(2), 175 (1998)
Nancy B, John G, Ekerdt, J. Catal., 101, 90 (1986)
Haefner DL, Thodos G, Ind. Eng. Chem. Fundam., 25, 498 (1986)
Aloke KG, Amar NS, Binoy RM, J. Catal. Chem. Eng., 997 (1999)
Yang RT, "Gas Separation by Adsorption Process," Butter-worth Publishers, Boston, U.S.A. (1987)
Otowa T, Yamada M, Tanibata R, Kawangami M, Vansant EF, Dewolfs R, Elsevier, 263, New York (1990)
Veley, J. Chem. Soc., 63, 821 (1893)
Proks, Siske, Chem. Zvesti., 12, 275 (1958)
Owen AJ, Dedman AJ, Trans. Faraday Soc., 58, 2027 (1961)
Horiuchi T, Hidaka H, Fukui T, Kubo Y, Horio M, Suzuki K, Mori T, Appl. Catal. A: Gen., 167(2), 195 (1998)
Shimizu T, Hirama T, Hosoda H, Kitano K, Inagaki M, Tejima K, Chem. Eng. Res. Des., 77(1), 62 (1999)
Dario B, Luigi B, J. Am. Ceram. Soc., 63, 8 (1980)
Levenspiel O, "Chemical Reaction Engineering-Third Edition," (2001)
Yagi S, Kunii D, "Fifth International Symposium on Combustion Reinhold," New York (1955)
Bhatia SK, Perlmutter DD, AIChE J., 29, 79 (1983)
Kang SH, Rhee YW, Kang Y, Han KH, Lee CK, Jin GT, HWAHAK KONGHAK, 35(5), 642 (1997)
Nodzenski A, Fuel, 77(11), 1243 (1998)
