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The solids flow in the CFB-riser quantified by single radioactive particle tracking
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Mahmoudi, Shiva, Baeyens, Jan and Seville, J. P. K. (Jonathan P. K.) (2011) The solids flow in the CFB-riser quantified by single radioactive particle tracking. Powder Technology, Vol.211 (No.1). pp. 135-143. doi:10.1016/j.powtec.2011.04.011 ISSN 0032-5910.
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Official URL: http://dx.doi.org/10.1016/j.powtec.2011.04.011
Abstract
Single radioactive particle tracking was used to measure the overall solids residence time (and its distribution) in the riser of a CFB, operating at superficial air velocities (U) of 1 to 9 ms− 1 and solids circulation fluxes (G) between 20 to 600 kg m− 2s− 1.
The results demonstrate that the particle motion and mixing differ according to the operating mode of the riser, with a fairly constant velocity throughout the riser achieved in the dilute or dense riser flow, but with a significant amount of back-mixing for intermediate values of U and/or G. This back-mixing is due to the core-annulus mode of particle flow. Whereas experimental results and theoretical predictions are in fair agreement for the dilute and dense riser flow, the core-annulus regime needs to account for a U and G dependent slip factor (φ), in excess of the commonly proposed value φ = 2, especially at U–UTR < 2 ms− 1.
Moreover, the previously published riser operation diagram is confirmed by the experiments, although a further analysis of the core-annulus regime is needed.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QC Physics T Technology > TA Engineering (General). Civil engineering (General) |
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| Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | ||||
| Library of Congress Subject Headings (LCSH): | Fluid dynamics, Fluidized-bed combustion , Particle tracks (Nuclear physics), Positrons -- Emission | ||||
| Journal or Publication Title: | Powder Technology | ||||
| Publisher: | Elsevier Science SA | ||||
| ISSN: | 0032-5910 | ||||
| Official Date: | 2011 | ||||
| Dates: |
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| Volume: | Vol.211 | ||||
| Number: | No.1 | ||||
| Page Range: | pp. 135-143 | ||||
| DOI: | 10.1016/j.powtec.2011.04.011 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published |
Data sourced from Thomson Reuters' Web of Knowledge
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