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

Publication history: Received August 14, 2009
Accepted November 3, 2009

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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Multiple effects of operating variables on heat transfer in three-phase slurry bubble columns

Ik Sang Shin Sung Mo Son Dae Ho Lim Yong Kang^† Heon Jung¹ Ho Tae Lee¹

School of Bio and Applied Chemical Engineering, Chungnam National University, Daejeon 305-764, Korea ¹Synfuel Research Group, Korea Institute of Energy Research, Daejeon 305-343, Korea

Korean Journal of Chemical Engineering, March 2010, 27(3), 1015-1020(6), 10.1007/s11814-010-0155-1

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Abstract

Characteristics of heat transfer were investigated in pressurized slurry bubble column reactors whose diameter was either 0.051, 0.076, 0.102 or 0.152 m (ID) and 1.5 m in height, respectively. Effects of gas velocity (U(G)), solid contents (S(C)), pressure (P), liquid viscosity (μ(L)) and column diameter (D) on the heat transfer coefficient (h) between the immersed vertical heater and the column were determined. Multiple effects such as U(G) and D, P and D, μ(L) and D, and S(C) and D on the value of heat transfer coefficient were discussed. Temperature fluctuations were also measured and analyzed by adapting chaos theory, which was used to explain the effects of operating variables on the heat transfer in the column. The heat transfer coefficient increased with increasing gas velocity, pressure or solid content in the slurry phase, but decreased with increasing liquid viscosity or column diameter. The decrease trend of h with increasing column_x000D_ diameter was somewhat sensitive when the gas velocity was relatively high (U(G)≥12 cm/s). The effects of column diameter on the h value became almost linear when the operating pressure (P=4-10 kgf /cm2), liquid viscosity (μ(L)=20-38 mPa·s) or solid content in the slurry phase (S(C)=10-20 wt%) was relatively high and gas velocity was relatively low, within these experimental conditions. The heat transfer coefficient was well correlated in terms of dimensionless groups as well as operating variables.

Keywords

Temperature Fluctuations Heat Transfer Slurry Bubble Column Pressure Viscous Column Diameter

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