Analysis of hematite attrition in a grid jet apparatus

Particulate attrition is of interest for novel carbon-capture processes such as chemical looping combustion because the makeup cost of oxygen carrier is a significant portion of operating cost. Thus, models to study and predict attrition of various oxygen carriers in fluidized bed systems are being...

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Bibliographic Details
Published in:Powder technology 2021-03, Vol.380, p.377-384
Main Authors: Bayham, Samuel C., Galinsky, Nathan L., Hughes, Bryan, Wei, Xiaoyang
Format: Article
Language:English
Subjects:
Abrasion
Attrition
Chemical looping
Distributors
Fluidized bed combustion
Fluidized beds
Fragmentation
Hematite
Operating costs
Oxygen
Particle decay
Particle size
Particle size distribution
Population balance
Population balance models
Powder
Size distribution
Velocity
Weight
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Summary:Particulate attrition is of interest for novel carbon-capture processes such as chemical looping combustion because the makeup cost of oxygen carrier is a significant portion of operating cost. Thus, models to study and predict attrition of various oxygen carriers in fluidized bed systems are being developed. One of the regions of concern in fluidized bed systems is the high-velocity jet region near gas distributors in a fluid bed. This work studies the attrition of hematite particles using a modified ASTM apparatus to measure the particle size distribution throughout the experiment. Bed weight and gas velocity were varied. Hematite particles above the corresponding threshold value had a severe variation of particle size distributions which decreased with time. Weight fractions of the sieves over time were fit to a linear, time-variant population balance model to offer insight into particle attrition. The first-order rate constant was modified as a decaying exponential. [Display omitted] •Attrition of hematite particles studied using a modified ASTM apparatus.•Particle size distribution recorded throughout the experiment.•Data fit to a linear, time-variant population balance model for attrition insight.•First-order PBM rate constant was modified to a decaying exponential term.
ISSN:0032-5910
1873-328X
DOI:10.1016/j.powtec.2020.11.002