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. ISSN 0032-5910

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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)
Divisions:	Faculty of Science > 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
Date:	2011
Volume:	Vol.211
Number:	No.1
Page Range:	pp. 135-143
Identification Number:	10.1016/j.powtec.2011.04.011
Status:	Peer Reviewed
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/39451

Data sourced from Thomson Reuters' Web of Knowledge

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