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Distribution of Pressure Drop and Particle Concentration in a Horizontal Circulating Fluidized Bed Boiler

XIANG Jie;LI Qinghai;ZHANG Yanguo;MENG Aihong;Key Laboratory for Thermal Science and Power Engineering of Ministry of Education,Department of Thermal Engineering,Tsinghua University;  
To study the gas-solid flow characteristics in a horizontal circulating fluidized bed(HCFB),the effects of bed material diameter and superficial gas velocity on the profile of pressure drop and particle concentration were analyzed by taking three glass beads(dp=87μm,170μm,and 211μm)as the test material on a HFCB cold-state test setup with cyclone separator using differential pressure sensors and a fiber optic probe.Results indicate that the pressure drop mainly occurs in the primary chamber,accounting for approximately 90% of the total pressure drop.However,the pressure changes little in the secondary and burnout chamber.In the primary chamber,the axial profiles of both pressure drop and particle concentration are characterized by an exponential curve and the lateral particle concentration distributes in an annulus-core structure.The particle concentration is severely asymmetrical in the secondary chamber,dilute at the left and dense at the right,which always remains low in the burnout chamber.The superficial gas velocity has to reach at least 1.25m/s,1.50m/s,and 2.00m/s respectively for the three glass beads to obtain a state of circulating fluidization.
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