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

Publication history: Received March 4, 2002
Accepted June 3, 2002

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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Solid Circulation Characteristics in an Internally Circulating Fluidized Bed with Orifice-Type Draft Tube

Sang Done Kim^† Yo Han Kim Seon Ah Roh Dong Hyun Lee

Department of Chemical Engineering and Energy & Environment Research Center, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea

kimsd@kaist.ac.kr

Korean Journal of Chemical Engineering, September 2002, 19(5), 911-916(6), 10.1007/BF02706989

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Abstract

Effects of superficial gas velocities to a draft tube, to an annulus section and particle size on the solid circulation rate (Gs) have been determined in an internally circulating fluidized bed (0.28 m I.D.×2 m high) with an orifice type draft tube. The solid circulation rate from the draft tube to an annulus section increases with increasing gas velocities to the draft tube (Ud) and annulus section (Ua) and consequent increase in pressure drop across the orifice (ΔPor). However, the values of Gs decrease by 7-21% with increasing particle size from 86 to 288 μm. The pressure_x000D_ drop across the orifice increases with increasing Ud and Ua. However, ΔPor decreases by 5-23% with increasing particle size. To predict Gs in an internally circulating fluidized bed, a correlation is proposed as a function of ΔPor.

Keywords

Internally Circulating Fluidized Bed Draft Tube Solid Circulation Rate Pressure Drop across the Orifice Correlation

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