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| Prof. Wei's research interests cover a number of topics within the fields of Fluidization, Multi-Phase Reaction Engineering and Powder Technology | |||
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Turbulent Fluidized Bed. |
Powder
Technology |
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| Cocurrent
Gas Solids Down Flow Circulating Fluidized Bed |
Mixing |
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| Circulating
Fluidized Bed |
Computatiuonal
Fluid Dynamics. |
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Hydrodynamics in turbulent
fluidized beds ¾ Transient solids fraction
velocity was studied by LDV and optical fiber sensity probe to measure
axial and radial solids fraction and velocity in 140 and 500 mm Diameter
bed.
Gas mixing in turbulent fluidized
beds ¾ Gas tracer technique was used
to measure axial and radial gas dispersion coefficients in 140 and 500
mm Diameter bed.
Scale up of fluidized bed
reactors. ¾ Scale up was made basing
on the gas mixing behaviours. This study has provided a practical method
for the commercial design of fluidized bed reactors operated in the turbulent
regime. Three commercial turbulent fluidized bed reactor with diameter
of 5400, 5400, 2800 mm are in operation.
New gas distributor Concept
is proposed to reduce the axial gas mixing in the turbulent fluidized bed.
Concept of High Velocity
Turbulent Fluidized Bed. ¾ The experimental
results were obtained in a 500 mm diameter turbulent fluidized bed.
Cocurrent Gas Solids Down Flow Circulating Fluidized Bed
Distributor designs for
uniform gas and solids distribution and scale-up. ¾
Various designs were explored.
Flow dynamic studies in various
downer with emphasis on enhancement of uniform flow by modifications of
entrance and exit geometry of the bed.
Hydrodynamics characteristics
in various downer reactors(90, 140, 420 mm ID) using flow visualization
, laser Doppler velocimetery, phosphors tracer, optical fiber density sensor
techniques.
Development of fluid dynamics
model for downer reactor using kinetic theory.
High density circulating
fluidized bed ¾ Hydrodynamics of high
density circulating fluidized beds including transtient flow behavior in
the macro- scales by a one dimentional optical fiber image system, radial
solids concentration, flux and velocity profiles. Design of a pilot scale high
density circulating fluidized bed catalytic reactor, in charge of its operation. Effect of particle size,density
and sphericity on velocity and mixing in circulating fluizied bed. Effect of internals and buffles
on the hydrodynamics and mixing in high density riser Transient density signal analysis
in circulating fluidized bed. ¾ The dynamic
flow characteristics CFB were examined by analyzing density fluctuations
through, instantaneous solids density, particle velocity in the riser,
and local flow structure in a riser. Two phase signal are found in the
riser. This study provided essential information for the effective system
control for CFB operations. Phosphors tracer method
in a riser with different particle size, density and sphericity ¾
Phosphor particle as particle tracer was used to quantify
the tracer particles. The effects of particle size, density and sphericity
on the solid flow, axial and radial mixing were examined. Two dimensional modeling
of high density riser catalytic reactor.
Swirling flow in circulating fluidized bed
Development of various
kinds of swirl flow structure in riser to intensify the transfer in the
riser ¾ This research had led to a new
design of a swirling flow dryer.
Effect of particle size on
the collapse behaviors, It is found the 30 micros particle has max. collapse
time, good flow properties in fluidized bed.
Nanoparticle Fluidization:
Nanoparticle can be fluidized at certain conditions, nanosize silica gel
are used to fluidized.
Powder Technology (under construction)
Compuataional Fluid Dynamics (under construction)