Hydrodynamics Study of Gas-Solid Flow Pattern in an Internally Circulating Fluidized Bed with a Draft Tube

Gujjula, R and M, Narasimha (2014) Hydrodynamics Study of Gas-Solid Flow Pattern in an Internally Circulating Fluidized Bed with a Draft Tube. In: CFB-11: Proceedings of the 11th International Conference on Fluidized Bed Technology, 14-17, May 2014 , Beijing; China.

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Abstract

Circulating fluidized beds (CFB) are widely used in coal combustion and gasification processes. These CFBs suffer from having very tall column as a solids raiser and accompanying additional external circulation of solids through cyclone. To avoid the external circulation accessories a compact internally circulating fluidized bed (IFCB) is developed. ICFB represent a modified spouted fluidized bed with a draft tube inside to avoid problem of gas bypassing. The hydrodynamics of ICFB have studied using combination of experiments and CFD simulations. Solids circulation rate and bed pressure drop were measured using high speed camera and pressure manometers for a wide range of particle sizes and bed heights. 3D Twofluid Eulerian granular flow model was adopted to predict the hydrodynamic behavior of ICFB. Effect of gas velocity, presence of draft tube on solid hold-up distribution, solid circulation pattern and variations in gas bypassing fraction in the ICFB have been investigated with the help of CFD simulations. CFD validation against the experimental data is made

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IITH Creators:
IITH CreatorsORCiD
M, Narasimhahttp://orcid.org/0000-0002-3123-2811
Item Type: Conference or Workshop Item (Paper)
Subjects: Chemical Engineering > Biochemical Engineering
Divisions: Department of Computer Science & Engineering
Depositing User: Team Library
Date Deposited: 16 Dec 2014 10:59
Last Modified: 13 Jul 2017 11:19
URI: http://raiith.iith.ac.in/id/eprint/1143
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