(598b) Study of Effect of Design and Operating Conditions On Spouted Bed Hydrodynamics

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Study of Effect of Design and Operating Conditions on Spouted Bed Hydrodynamics

 

^*Shreekanta B Aradhya, ^*+Muthanna Al-Dahhan

^*Department of Chemical & Biological Engineering

⁺Department of Nuclear Engineering

Missouri University of Science & Technology, Rolla, MO – 65409, USA

Email: sba2p4@mst.edu

 

Due to their efficiency in contacting gases and coarser particles, spouted fluidized beds have been successfully applied to a wide variety of processes, such as coating, granulation, drying, coal gasification, catalytic reactions, etc. Under proper conditions, the jet penetrates the bed of particles, creating a central spout zone, a fountain above the spout, and an annulus surrounding the spout.  Particles entrained in the gas spout form a fountain of particles above the bed surface that disengage from the gases and fall back to the bed surface, thus inducing bed circulation.  Different spouted bed configurations have been used and studied, such as conical, cylindrical, cone-based, and slot-rectangular spouted beds (Freitas et al., 2004 a,b; Zanoelo et al., 2004).

One of the spouted bed’s features is the possibility of obtaining different flow regimes and flow characteristics with minor variations in geometry or operating conditions.  In this work, the effect on hydrodynamics of spouted beds will be studied by changing the design and operating conditions. Local parameters such solids holdup, solids velocity and their fluctuations will be studied with the help of advanced optical probes. The fluctuations produced from optical probe will be analyzed statistically to obtain several different information about the spouted bed system.  The time series signals obtained from pressure transducer will also be analyzed using chaotic analysis to deduce useful information. Two different size spouted bed columns have been identified for the present work. Experiments will be performed in these two columns using several different particles at varying conditions to determine the hydrodynamics using advanced optical probes and pressure transducer.