Experimental and theoretical investigation of a three-phase draft tube spouted bed reactor with external annular flow
In this study both the hydrodynamics and performance of a three phase Spouted Bed Reactor Equipped with Draft Tube (SBDE) are investigated. In this system the solid particles were sprouted using an aqueous phase and the gas was injected into the annulus via spargers. Thus within the annulus of this system a three phase region exists in which gas and liquid flow countercurrent to the downward moving particles. Various regimes are possible in this three phase region. A novel variational technique was used to predict pressure gradients within the two phase draft tube region. This theory lead to the development of a choking criterion and to model for predicting the minimum fluid velocity in the SBDE. Models for the various hydrodynamic parameters i.e. pressure, voidage and particle velocity profiles also followed from this theory. A general pressure identity was also formulated which is applicable to all two-phase fluid-particle systems. Hydrodynamic studies were conducted in a 76.2 mm cylindrical half column using gas particles of three different diameters (2.73mm, 0.998mm and 0.460mm). Water was the spouting fluid. Air was introduced to the system via a sparger located in the annulus of the SBDE. Experimental regime maps, pressure profiles, particle velocities were obtained for the system. Excellent agreement between theoretical and experimental values in all cases was found. A general reactor model was also constructed using the hydrodynamic models developed in this study. Specifically, the effect of various hydrodynamic parameters on overall reactor performance was ascertained. The zinc dithionate reaction was used to verify the reactor model.
- Research Organization:
- Rensselaer Polytechnic Inst., Troy, NY (USA)
- OSTI ID:
- 5996283
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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FLUIDIZED BEDS
HYDRODYNAMICS
AIR
CHEMICAL REACTORS
FLOW MODELS
GAS FLOW
GLASS
LIQUID FLOW
MULTIPHASE FLOW
PARTICLE SIZE
PERFORMANCE
PRESSURE GRADIENTS
SOLIDS FLOW
SPARGERS
VOID FRACTION
WATER
FLUID FLOW
FLUID MECHANICS
FLUIDS
GASES
HYDROGEN COMPOUNDS
MATHEMATICAL MODELS
MECHANICS
OXYGEN COMPOUNDS
SIZE
420400* - Engineering- Heat Transfer & Fluid Flow