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为提高干扰流化床对细粒煤的分选性能,采用数值模拟方法,考察了细粒煤在流化床中的散式流化特性.计算结果表明,颗粒分层行为对水速变化较敏感,流化床可调操作参数较少,仅依靠水速调节,难以实现细粒煤高效分选.对于多组分细粒煤(粒度0.75,0.35mm,密度1.4,1.7,2.0g/cm3),床层密度不均匀,在轴向逐渐降低,分选密度为1.67g/cm3时,可能偏差E值为0.24,分选精度较低.提出一种由多个截顶倒圆锥形多孔板组成的内构件,在相同条件下,带内构件干扰床强化了颗粒的密度分离,E值达到0.14;同时,多孔板可防止高密度颗粒在其表面黏附.因此,该内构件有效提高了普通干扰床的分选性能.
In order to improve the performance of the fluidized bed interfering with the classification of fine coal, the numerical simulation method was used to investigate the dispersive fluidization characteristics of the fine coal in the fluidized bed. The calculated results show that the particle stratification behavior is more variable for water velocity Sensitive, fluidized bed adjustable operating parameters less, only rely on water speed regulation, it is difficult to achieve efficient separation of fine coal.For multi-component fine coal (particle size 0.75,0.35mm, density 1.4,1.7,2.0g / cm3 ), The bed density is uneven, the axial density decreases gradually, when the sorting density is 1.67g / cm3, the possible deviation E value is 0.24 and the sorting accuracy is low.A multi-truncated inverted conical perforated plate , Under the same conditions, the in-band interference bed enhanced the density separation of the particles with an E value of 0.14, meanwhile, the porous plate can prevent the high density particles from adhering to the surface of the inner member, therefore, the inner member effectively improves the normal Interfering bed sorting performance.