Abstract
Chemical looping combustion has become a promising combustion technology for its inherent advantage of CO2 separation. Oxygen carrier particles play a vital role in this technology, however, they usually suffered from serious attrition in the long-term operation. Due to large quantity of particles and the complex fluidization process, it is difficult to obtain particle collision characteristics by experimental study, and the existing fluid-solid flow model does not consider the particle breakage model. This study combined the convex polyhedral particle model and the Ab-T10 breakage model based on the Euler-Lagrange two-way coupling method to reveal the actual particle attrition process during fluidization. Comparison of particle size distribution between simulation and experimental results further verified the accuracy of the simulation model. The result shows that the average collision frequencies on the geometric surface of particles with sizes of 0.27, 0.3 and 0.33 mm are 740.9, 717.4, and 841.5 1/s, respectively. The average velocity and impact energy of particles have similar periodic variation, and with the progress of breakage, those two factors lead to the approximately normal distribution of particles with size between 60 and 240 μm.
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