Yang Hairui‚LüJunfu‚Liu Qing‚Y ue Guangxi

（Department of Thermal Engineering，Tsinghua University‚Beijing‚100084China）

Abstract

Lateral and axial solids mixing are studied experimentally in 100mm ×3m fast fluidized bed riser．Using hot particles as tracer‚the temperature response curve at different radial position in fast fluidized bed are measured．A proposed two－dimensional dispersion model describes the experimental data very well．T he axial dispersion coefficient‚Da increases with increasing of superficial gas velocity v g and increases little with increasing bed height（ H）‚while the lateral dispersion coefficientDr changes little with the increasing of v g and H．

Keywords：fast fluidized bed；dispersion；dispersion coefficient

DOI：10.13732/j.issn.1008-5548.1999.06.002