Fluidization Characteristics of TiO2 Ultrafine Particles in an Acoustic Spout-fluid Bed with a Draft Tube
-
Hainian Li
,
Liqiang Pi
Abstract
An experimental study was performed to investigate the effects of spouting gas velocity, fluidizing gas velocity, sound wave frequency and sound wave pressure level on fluidization behaviors of ultrafine particles in an acoustic spout-fluid bed with a draft tube. A half-cylinder with a diameter of 120 mm and height of 1200 mm was used as the fluidization column, TiO2 ultrafine particles with an average diameter of 290 nm were employed as the bed materials while the high-speed atmosphere jet was utilized as the spouting gas. Results showed that high-speed jet as spouting gas could effectively disrupt the agglomerates of TiO2 ultrafine particles and reduce the agglomerate size significantly. The introduced fluidized gas in annulus was conducive to eliminate dead-zone in the bottom of bed. Sound wave could break bubbles, restrain channeling making the axial fluidization state in annular region to be more uniform and homogeneous, thus significantly improved the fluidization quality of agglomerates in the annulus, reduced the minimum spouting velocity of particles, and promoted the stable circulation of inner particles in spout-fluid bed with a draft tube.
Funding statement: National Natural Science Foundation of China, (Grant / Award Number: '21376151')
Nomenclature
- f
sound frequency (Hz)
- H0
static bed height (m)
- Qf
fluidizing gas flow (m3·h−1)
- Qs
spouting gas flow (m3·h−1)
- SPL
sound pressure level (dB)
- uf
fluidizing gas velocity (m·s−1)
- us
spouting gas velocity (m·s−1)
- uj
jet gas velocity (m·s−1)
- ums
the minimum spouting velocity (m·s−1)
- da
agglomerate size (μm)
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Articles in the same Issue
- Experimental and Numerical Study of the Hydrodynamics of a Thin Film Reactor (TFR) for the Decarboxylation of Anacardic Acid
- Ammonia Leaching of Zinc from Low-grade Oxide Zinc Ores Using the Enhancement of the Microwave Irradiation
- Two-fluid Modeling of Geldart A Particles in Gas-solid Bubbling Fluidized Bed: Assessment of Drag Models and Solid Viscosity Correlations
- Effect of Preparation Method on Ag Modified Ti-HMS Catalyst Structure and Catalytic Oxidative Desulfurization Performance
- Effects of Sparger and Internals Designs on the Local Hydrodynamics in Slurry Bubble Column Reactors Operating under Typical Fischer-Tropsch Process Conditions - I
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- Simulation and Analysis of Flow Field in Sludge Anaerobic Digestion Reactor based on Computational Fluid Dynamics
- Bio-oil as Substitute of Phenol for Synthesis of Resol-type Phenolic Resin as Wood Adhesive
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