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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received May 14, 2004
Accepted June 29, 2004

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Temperature Fluctuations and Heat Transfer in a Fluidized-Bed Combustor of Waste Oil

Jun-Sik Kim^† Sang-Do Kim¹ Chan-Gi Lee² Yong Kang² Myoung-Jae Choi

Environment and Resources Group, KRICT, Daejeon 305-600, Korea ¹Energy and Environmental Research Division, KIER, Daejeon 305-343, Korea ²Department of Chemical Engineering, Chungnam National University, Daejeon 305-764, Korea

junskim@krict.re.kr

Korean Journal of Chemical Engineering, September 2004, 21(5), 1081-1086(6), 10.1007/BF02705596

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Abstract

Temperature fluctuations and heat transfer characteristics were investigated in a fluidized-bed combustor of 0.102 m ID and 2.5 m in height, which was designed for waste oil combustion. Effects of excess air (A_E), injection height (H_I) and feeding rate of waste oil (Q_F) on the mean bed temperature (T_B, Kolmogorov entropy (K₂) of phase space portraits and heat transfer coefficient (U_O) in the fluidized-bed combustor were determined. T_B increased, but K₂ and U_O decreased with increasing A_E. K₂ had a local minimum, but T_B and U_O had a maximum at H_I of 0.4 m. T_B increased, but K₂ had a minimum and U_O had a maximum with increasing Q_F in the combustor. T_B, K₂ and U_O obtained at the optimum operating condition (A_E=40%, H_I=0.4 m, Q_F=30 g/min) were about 855 ℃, 22 bits/s and 382 W/m²K, respectively.

Keywords

Fluidized-bed Combustor Waste Oil Heat Transfer Coefficient Temperature Fluctuations Chaos Theory

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