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Effect of Intruded Exit on Riser Type Circulating Fluidized Beds

  • Sudarshan K. Daga and Vineet Kumar
Published/Copyright: November 20, 2009
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The present work attempts to study the flow dynamics of Geldart group A and group B particles in a circulating fluidized bed (CFB) riser with intruded exits using computational fluid dynamics (CFD) techniques. In this work, three different designs of riser exit geometries were studied using a 2D transient Eulerian approach with kinetic theory of granular flow in a commercial CFD simulation package. The three exits geometries, namely conventional exit, intruded curved and straight exits were designed and simulated. The various factors like solid volume fraction, pressure drop, and solid velocity were studied for both group A and group B particles. Results indicate that intruded exits have certain advantages like low riser pressure, uniform particle distribution, etc., over the conventional design because fluid and particle comes out from the core of the riser where there is no wall effect and particles have higher momentum concentration.

Published Online: 2009-11-20

©2011 Walter de Gruyter GmbH & Co. KG, Berlin/Boston

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