Aerodynamics of a swirling fluidized bed
Swirling Fluidized Bed (SFB) is one of the fluidized bed systems that have potential to be widely used in the mineral processing, power generation and chemical industries. By using an annular bed and inclined injection of gas through the distributor in SFB it will archive a high performance in fl...
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| Format: | Thesis |
| Language: | English English English |
| Published: |
2013
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/1967/1/24p%20MOHD%20AL-HAFIZ%20MOHD%20NAWI.pdf http://eprints.uthm.edu.my/1967/2/MOHD%20AL-HAFIZ%20MOHD%20NAWI%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/1967/3/MOHD%20AL-HAFIZ%20MOHD%20NAWI%20WATERMARK.pdf |
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| Summary: | Swirling Fluidized Bed (SFB) is one of the fluidized bed systems that have potential
to be widely used in the mineral processing, power generation and chemical
industries. By using an annular bed and inclined injection of gas through the
distributor in SFB it will archive a high performance in fluidization. A numerical
simulation Computational Fluid Dynamics (CFD) and experimental work with
Particle Image Velocimetry (PIV) has been used to investigate physical parameters
that influence the type of plenum chamber, the distributor pressure drop and the
uniformity of tangential velocity distribution. The study focused on the 60 blades
distributor whereby the effect of two horizontal inclinations (12° and 15°) and
tangential entry plenum chamber (single, double and triple). Three velocities
component were analyzed; tangential velocity, radial velocity and axial velocity. In
actual industrial applications, the axial velocity will create fluidization while the
tangential velocity provides swirling effect. The presence of radial velocity can be
explained as a consequence of centrifugal force generated by the swirling gas. The
tangential velocity is the major velocity component in this study and it represents the
velocity of the swirling air in the annular region of the bed. The uniformity of
tangential velocity distribution and pressure drop is set as performance criteria and
has been analyzed with statistical method; mean value, standard deviation & root
mean square of difference (RMSD). The most significant finding in simulation
configuration is the pressure drop of the distributor blade increased when a triple
tangential entry plenum chamber along with horizontal inclination 15° has been
applied which then create high tangential velocity. Only parameter for double
tangential entry plenum chamber consists with horizontal inclination, 12° has been
selected to validate with the PIV result. Comparison of the simulation result (CFD)
and experimental data (PIV) are presented, and it is confirmed that good agreement
is obtained. |
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