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Received May 4, 2004
Accepted July 26, 2004
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Axial Gas Phase Dispersion in a Molten Salt Oxidation Reactor
Nuclear Fuel Cycle R&D Group, Korea Atomic Energy Research Institute, P.O. Box 105 Yuseong, Daejeon 305-600, Korea 1Quantum Energy Chemical Engineering, University of Science and Technology, P.O. Box 52, Eoeun, Yuseong, Daejeon 305-333, Korea
Korean Journal of Chemical Engineering, November 2004, 21(6), 1250-1255(6), 10.1007/BF02719503
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Abstract
Gas phase axial dispersion characteristics were determined in a molten salt oxidation reactor (air-molten sodium carbonate salt two phase system). The effects of the gas velocity (0.05-0.22 m/s) and molten salt bed temperature (870-970 ℃) on the gas phase axial dispersion coefficient were studied. The amount of axial gas-phase dispersion was experimentally evaluated by means of residence time distribution (RTD) experiments using an inert gas tracer (CO). The experimentally determined RTD curves were interpreted by using the axial dispersions model, which proved to be a suitable means of describing the axial mixing in the gas phase. The results indicated that the axial dispersion coefficients exhibited an asymptotic value with increasing gas velocity due to the plug-flow like behavior in the higher gas velocity. Temperature had positive effects on the gas phase dispersion. The effect of the temperature on the dispersion intensity was interpreted in terms of the liquid circulation velocity using the drift-flux model.
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Lin TJ, Tsuchiya K, Fan LS, AIChE J., 44(3), 545 (1998)
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Runjun Z, Xinzhen J, Baozhang L, Yong Z, Laiqi Z, Ind. Eng. Chem. Res., 27, 1910 (1988)
Shetty SA, Kantak MV, Kelkar BG, AIChE J., 38, 1013 (1992)
Veera UP, Kataria KL, Joshi JB, Chem. Eng. J., 84(3), 247 (2001)
Vial C, Poncin S, Wild G, Midoux N, Chem. Eng. Process., 40(2), 135 (2001)
Wachi S, Nojima Y, Chem. Eng. Sci., 45, 901 (1990)
Yang HC, Cho YJ, Yun JS, Kim JH, Can. J. Chem. Eng., 81, 713 (2003)
Zahradnik J, Fialova M, Chem. Eng. Sci., 51(10), 2491 (1996)
Zubar N, Findlay J, Trans. ASME, J. Heat Transfer Ser., C87, 453 (1965)
