Separation characteristics of fine coal in hindered fluidized bed with perforated plate
WANG Zenan
TANG Ligang
Abstract：In order to increase the separation performance of normal hindered fluidized bed for fine coal,the perforated plates were designed in this work.The separation characteristics of fine coal in the bed with perforated plate were investigated using a combination of experimen-tal and numerical simulation methods.The results showed that the perforated plate were beneficial for the uniformity of separation density of each particle size range.The slope of particle size-separation density curve was increased from -0.518 to -0.448.The density separation of particles and separation performance were increased.The high-density particles(1. 70 and 1. 90 g/ cm3 ) distributed at the bottom of bed. Their volume fractions were 29.79% and 32.86% respectively.The low-density particles(1. 40 and 1. 50 g/ cm3 ) distributed at the upper of bed.Their volume fractions were 48.90% and 20.81% respectively.The misplaced particles were less,so the coal particles can be separa-ted effectively.Furthermore,the density of suspension zone of bed wasn't the separation density.The fluidization density was 1.23 g/ cm3 which was uneven along the height direction.The multi-stage separation model,including perforated plates,flluidized zone among plates and the bed wall could inhibit the mismatch of high-density and low-density particles,meanwhile,separate the fine coal effectively.
Keywords：fine coalhindered fluidized bedperforated platenumerical simulationseparation characteristic
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 64-67 )