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Gas-solids flow in the riser of a circulating fluidized bed

✍ Scribed by Yinghe He; Victor Rudolph

Publisher: Elsevier Science
Year: 1995
Tongue: English
Weight: 773 KB
Volume: 50
Category: Article
ISSN: 0009-2509
DOI: 10.1016/0009-2509(95)00170-a

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✦ Synopsis

Abstraet--A new approach to the modelling of gross gas-solids flow through the riser in a circulating fluidized-bed system is proposed in this paper. This approach differs from the previous ones, which are found to be theoretically incorrect based on a fundamental analysis of the riser process hydrodynamics. Starting from the basic principles, the new approach tackles the modelling problem from both energy and momentum balance perspectives. It also identifies that a riser may be operating in two different flow regimes: the entrainment regime and the dragging regime. Experimental results from a compartmented dense-phase circulating fluidized bed, developed for a continuous coal combustion-gasification process, verified the existence of the two flow regimes.

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