Numerical Simulation of Gas/Solid Flow in a Novel Annular Spouted Bed with Multiple Gas Nozzles

Abstract

A novel annular spouted bed with multiple gas nozzles, has been proposed for dryness, pyrolysis, and gasification of coal particulates. It consists of two homocentric upright cylinders with some annularly located spouting gas nozzles between inner and outer cylinders. A three-dimensional Eulerian multiphase model, with closure law according to the kinetic theory of granular flow, was used to simulate the gas/solid flow behaviors in the spouted beds. The simulation results show that numerical simulation is a useful tool to get detailed information about the gas/solid turbulent motions in the novel spouted beds. Along the bed height, the pressure tends to decrease. Particle concentration increases with increasing of distance away from the nozzle. The particle concentration is less for a high spouting gas velocity. The gas velocities at the center axis of nozzle decrease with increasing the static bed height.