PARTICLE MASS FLUX IN THE FREEBOARD OF A FLUIDIZED-BED BOILER

被引：15

作者：

ANDERSSON, BA

LECKNER, B

机构：

[1] Chalmers Univ of Technology, Sweden

来源：

POWDER TECHNOLOGY | 1989年 / 58卷 / 01期

关键词：

Boiler Firing--Pulverized Coal - Coal Combustion--Fluidized Beds - Flow of Fluids--Measurements - Fluid Dynamics--Mathematical Models;

D O I：

10.1016/0032-5910(89)80004-X

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

The flux of descending particles has been measured in the freeboard of a fluidized bed boiler. The lateral and vertical distributions of the flux were studied and the influence of the superficial gas velocity and the static bed height analyzed. A tube bundle located in the bed surface region made is possible to investigate the effects of tubes on the entrainment of particles from the surface of the bed. A model is used for the estimation of the vertical particle flux and concentration profiles in the freeboard. It is based on separate treatment of small and coarse particles and calculation of trajectories of ejected bed particles. The calculated freeboard values describe the experimental data satisfactorily except close to the bed, where a considerable discrepancy is observed.

引用

页码：25 / 37

页数：13