Effects of a Top-Down Flow on Gas-Solid Fluidization State in a Bubble Fluidized Bed

摘要

An experimental physical model was set up on the base of the fluidized furnace of a factory. The influence of top gas flow rate and position on gas-solid flow distribution characteristics were analyzed by the experimental comparison in bed. The results were shown that the gas-solid mixture was more homogenous distribution and had less effects from the top gas when the ratio of bed height to diameter was 1.58, the apparent gas velocity was 0.13-0.18 m/s and the continuous charging speed was 360 kg/h. The depth of the top jet had a great effect on the gas-solid flow in the expansion part of a babble fluidized bed. The elutriation and sticking of particles on the wall were decreased with the depth of the position of the jet increasing.