Influence of hydrodynamic parameters on particle attrition during fluidization at high temperature |
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Authors: | Chiou-Liang Lin Ming-Yen Wey |
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Affiliation: | (1) Department of Environmental Engineering, National Chung-Hsing University, 402 Taichung, Taiwan, ROC |
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Abstract: | In a fluidized bed, attrition both increases the number of particles and reduces particle size, which may affect reactor performance,
fluidizing properties, operating stability and operating costs. Most fluidized applications are conducted at high temperature,
but in the past most attrition correlations were performed at room temperature, so the attrition rate at high temperature
could not be predicted. In contrast, this study investigates the attrition rate of fluidized materials at high temperature.
Silica sand was used as the bed material; the operating parameters included temperature, particle size, static bed height
and gas velocity to assess the attrition rate. Then an appropriate correlation was developed by regression analysis to predict
attrition rate at high temperature. Experimental results indicated that the attrition rate increases with increasing temperature.
In addition, the particle attrition increased as average particle size decreased because the probability of collision increases
with surface area. The attrition rate increased with increasing gas velocity because of increased kinetic stress of particle
movement. The actual density and viscosity of air at specific fluidization temperature were modified and an Ar number was
introduced to fit our experimental data. The experimental correction agrees with the experimental results, which can predict
particle attrition rate at high temperatures. |
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Keywords: | Gas-solid Fluidization Attrition Rate High Temperature |
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