期刊
CHEMICAL ENGINEERING SCIENCE
卷 66, 期 11, 页码 2368-2376出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ces.2011.02.055
关键词
Spout fluidized beds; Granulation; Multiple spouts (nozzles); Particle image velocimetry; Discrete particle model; Positron emission particle tracking
资金
- FOM
- STW
- Yara Sluiskil, The Netherlands
- EPSRC [EP/F035845/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/F035845/1] Funding Source: researchfish
In this paper we study the effect of multiple spouts on the bed dynamics in a pseudo-2D triple-spout fluidized bed, employing the discrete particle model (DPM) and non-intrusive measurement techniques such as particle image velocimetry (PIV) and positron emission particle tracking (PEPT). A flow regime map was constructed, revealing new regimes that were not reported so far. The multiple-interacting-spouts regime (C) has been studied in detail for a double- and triple-spout fluidized bed, where the corresponding fluidization regime for a single-spout fluidized bed has been studied as a reference case. The experimental results obtained with PIV and PEPT agree very well for all the three cases, showing the good performance of these techniques. The DPM simulation results slightly deviate from the experiments which is attributed to particle-wall effects that are more dominant in pseudo-2D beds than in 3D systems. The investigated multiple-interacting-spouts regime is a fully new flow regime that does not appear in single-spout fluidized beds. Two flow patterns have been observed, viz, particle circulation in between the spouts near the bottom of the bed, and an apparent single-spout fluidization motion at a higher location upwards in the bed. These findings show that the presence of multiple spouts in a spout fluidized bed highly affect the flow behaviour, which cannot be distinguished by solely investigating single-spout fluidized beds. (C) 2011 Elsevier Ltd. All rights reserved.
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