浓相高密度分选流化床气体分布参数的研究

Research on Gas Distribution of Dense Phase High Density Fluidized Bed for Separation

描述了气固浓相高密度分选流化床的特性,分析了影响床层密度均匀稳定性的主要参数,研究了气体分布器的主要参数(阻降、开孔率、孔的分布等)对形成浓相高密度分选流化床的影响,提出了压降准数CP判别法,并以此判别分选流化床的流化质量及分选性能.结果表明,气体分布器阻降越大,流化性能就越好.当气体分布器阻降大于等于其临界值时,可以形成密度均匀稳定的分选流化床.气体分布器开孔率相同,孔径越小,床层密度的均匀稳定性及分选性能越好,而孔径相同,开孔率越大,床层密度的均匀稳定性及分选性能也越好.

Characteristics of dense phase and high density fluidized bed for mineral separation are introduced. The main parameters influencing on uniformity and stability of bed density are discussed. Effect of parameters of distributor on fluidizing and separating performances, including pressure drop, ratio of aperture, were studied in detail. A pressure drop number CP discriminance has been proposed for distinguishing quality and separation performance of a fluidized bed. Experimental results show that the higher the pressure drop of gas distributor is, the better the fluidizing performance of fluidized bed is. A fluidized bed with uniform and stable density for mineral separation can be formed when the pressure drop of gas distributor is higher than its critical value. Under the same ratio of aperture of distributor,the smaller the aperture of gas distributor is, the better the uniformity and stability of density is. The greater the ratio of aperture of gas distributor is, the better the uniformity and stability of density is, under the same aperture of distributor.