Drying in Spouted Beds with Draft Tube

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Naghdi, Hamed | 2019

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 52926 (06)
University: Sharif University of Technology
Department: Chemical and Petroleum Engineering
Advisor(s): Molaei Dehkordi, Asghar
Abstract:
Simulation runs have been conducted to predict the evolution of sand drying in conical spouted beds with a non-porous draft tube. In the simulation runs, the moisture content of the solid phase was assumed to be 7 % (kg water/kg sand). The simulation results were validated against experimental results reported by Olazar et al. and good agreement was obtained.Influences of various physical and geometrical parameters such as superficial gas velocity, inlet temperature, length and diameter of draft tube and initial moisture content on the sand drying were investigated. Temperature and gas velocity are the most important parameters for improving the drying process and reduce the drying time of sand paticles. The drag model, restitution coefficient and specularity coefficient have no effect on the particle drying. Increasing the diameter and initial moisture content of the particles increases the drying time, however increasing the conical bed angle causes the particles to dry out later. As the nozzle diameter and entrance length increase, the drying time decreases. Inadition, decreasing the diameter and length of the draft tube causes, decrease the drying time
Keywords:
Spouted Bed ; Draft Tube ; Drying ; Mass Transfer ; Heat Transfer ; Eulerian-Eulerian Approach

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