期刊
PARTICUOLOGY
卷 29, 期 -, 页码 103-109出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.partic.2016.01.010
关键词
Circulating fluidized bed riser; Dense gas-solid flow; High density; High flux; Hydrodynamics; Geldart group B particle
资金
- National High Technology Research and Development Program of China [2012AA06A115]
- National Natural Science Foundation of China [51476058, 91434120]
- Fundamental Research Funds for the Central Universities [2014MS13]
We carried out experiments to explore and characterize the gas-solid flow dynamics of Geldart group B particles in a dense circulating fluidized bed riser. By reducing the pressure drop, across the solid control valve and increasing the solid inventory in the storage tank, a high solid circulation rate and a solid holdup above 0.075 throughout the riser were simultaneously achieved. At a solid-to-gas mass flux ratio of approximately 105, flow transitioned from.fast fluidization to a dense suspension upflow. In the axial direction of the riser, solid holdup had an exponential profile, increasing with increasing solid circulation rate and/or decreasing superficial gas velocity. From the riser's center to its wall, the solid holdup increased markedly, exhibiting a steep parabolic profile. Increasing the solid circulation rate increased the radial non-uniformity of the solid concentration, while increasing the superficial gas velocity had the opposite effect. In our dense circulating fluidized bed riser, Geldart group B particles had similar slip characteristics to Geldart group A particles. (C) 2016 Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.
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