Journal
ADVANCED POWDER TECHNOLOGY
Volume 32, Issue 7, Pages 2359-2369Publisher
ELSEVIER
DOI: 10.1016/j.apt.2021.05.025
Keywords
Direct quadrature method of moment; Ultrafine particles; Particle agglomeration; Internally circulating fluidized bed
Categories
Funding
- National Natural Science Foundation of China [51406045]
- Fundamental Research Foundation for Universities of Heilongjiang Province [2019-KYYWF-0203, 2018-KYYWF-1652]
- National Key Research and Development Project [2018YFE0119800]
- Major science and technology projects of Heilongjiang Province [2019ZX03A02]
- Science Funds for the Young Innovative Talents of HUST [201504]
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In this study, the Euler-Euler gas-solid two-fluid model was employed to simulate the dynamic process of ultrafine particle movement and aggregation in an internally circulating fluidized bed. The results indicate that the breakage coefficient and inlet gas rate have significant effects on the concentration distribution of agglomerates, with higher inlet velocities resulting in better circulation of particles in the bed.
In the framework of the Euler-Euler gas-solid two-fluid model, the particle population balance equation is solved by the direct quadrature method of moment. The dynamic process of ultrafine particle movement and aggregation in an internally circulating fluidized bed is simulated. The distribution of the concentration and velocity of the agglomerates in the flow process is given, and the changes of the moments in the bed are shown. The effects of different breakage coefficients and inlet gas rates on the concentration distribution of agglomerates are compared. The results show that the particle size decreases with the increase of breakage coefficient, and the time required to reach steady fluidization state increases; the higher the inlet velocity, the better the effect of circulating particles in the bed. When there is a certain gas velocity difference between the two sides, the effect of circulating particles in the bed is better. (c) 2021 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.
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