论文部分内容阅读
气固磁稳定流化床是分选6～1mm细粒煤的有效手段,屈服应力对气固磁稳定流化床的稳定性和被分选颗粒的运动具有重要影响.采用拉板法,以0.074～0.045mm磁铁矿粉为加重质,对床层的屈服应力进行了研究.结果表明,磁稳定流化床的屈服应力是磁场强度、床层深度和表观气速的函数,分别随磁场强度及床层深度的增加而增大,随流化气速的增大而减小,磁场强度对屈服应力的影响最大,床层深度次之,表观气速影响最小.构建了3个因素对屈服应力的单因素作用模型及综合作用模型,为气固磁稳定流化床分选6～1mm细粒煤提供了理论基础.
The gas-solid magnetically stable fluidized bed is an effective method for sorting 6-1mm fine coal, and the yield stress has an important influence on the stability of the gas-solid magnetically stable fluidized bed and the movement of the particles being sorted. The results show that the yield stress of magnetically stabilized fluidized bed is a function of magnetic field strength, bed depth and superficial gas velocity, respectively Magnetic field strength and depth of bed increases with the increase of fluidized gas velocity decreases, the magnetic field strength of the maximum yield stress, followed by the depth of the bed, the minimum impact of apparent air velocity.Three The single factor model of yield stress and the integrated model of the factors provide the theoretical basis for the gas - solid magnetic fluidized bed separation 6 ~ 1mm fine coal.