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

Publication history: Received September 30, 2009
Accepted December 31, 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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Attrition behavior of fine particles in a fluidized bed with bimodal particles: Influence of particle density and size ratio

Zeeshan Nawaz^† Tang Xiaoping Xiaobo Wei Fei Wei

Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology (FLOTU),Department of Chemical Engineering, Tsinghua University, Beijing 100084, China

zeeshan@mails.tsinghua.edu.cn

Korean Journal of Chemical Engineering, September 2010, 27(5), 1606-1612(7), 10.1007/s11814-010-0240-5

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Abstract

To process the solid particulates in fluidized bed and slurry phase reactors, attrition is an inevitable consequence and is therefore one of the preliminary parameters for the catalyst design. In this paper, the mechanical degradation propensity of the zeolite catalysts (particles) was investigated in a bimodal distribution environment using a Gas Jet Attrition - ASTM standard fluidized bed test (D-5757). The experimentation was conducted in order to explore parameters affecting attrition phenomena in a bimodal fluidization. In a bimodal fluidization system, two different types of particles are co-fluidized isothermally. The air jet attrition index (AJI) showed distinct increases in the attrition rate of small particles in a bimodal fluidization environment under standard operating conditions, in comparison with single particle. A series of experiments were conducted using particles of various sizes, with large particles of different densities and sizes. Experimental results suggest that the relative density and particle size ratio have a significant influence on attrition behavior during co-fluidization. Therefore a generalized relationship has been drawn using Gwyn constants; those defined material properties of small particles. Moreover, distinct attrition incremental phenomenon was observed during co-fluidization owing to the change in collision pattern and impact, which was associated with relative particle density and size ratios.

Keywords

Attrition Zeolite Catalysts Co-fluidization Fracture Abrasion

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