Attrition behavior of fine particles in a fluidized bed with bimodal particles: Influence of particle density and size ratio |
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Authors: | Zeeshan Nawaz Tang Xiaoping Xiaobo Wei Fei Wei |
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Affiliation: | 1.Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology (FLOTU), Department of Chemical Engineering,Tsinghua University,Beijing,China |
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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. |
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