A two-dimensional hydrodynamic model of the internally circulating fluidized bed.

摘要

The gas spouted bed is a gas-solids contactor in which solid particles are rapidly carried upward by a gas stream in a central well-defined core called the spout, surrounded by a downward moving packed bed of aerated solids. It is a well-established reactor configuration and has been successfully applied in drying, blending, coating, coal combustion and gasification. However, the traditional spouted bed has two limitations: (1) instability at high temperature, (2) gas bypassing. Numerous efforts have been made to improve the unit for processes requiring high temperature and critical control of the reactant gas residence time; unfortunately, none of these modifications have been entirely successful.; In 1992, Milne, Berruti, and Behie introduced the ICFB, (Internally Circulating Fluidized Bed), which overcomes the high temperature limitations of the spouted bed. Furthermore, Liang (1993) studied the hydrodynamic behaviour of the ICFB in a laboratory scale model.; The main purpose of this research was to write a computer simulation model of the ICFB describing the gas and solids flows (hydrodynamics) in the reactor as effected by the inlet spout gas and auxiliary gas flow rates, particle size, and reactor geometry and to use the model to match the hydrodynamic data of Liang.