生物质和惰性颗粒二组分混合物的最小流化速度

STUDY ON FLOW CHARACTERISTICS BINARY MIXTURE CONTAINING BIOMASS MATERIALS AND A SECOND SOLID

实验发现纯锯末不能在流化床中流化，锯末中加入惰性固体颗粒构成锯末／玻璃珠、锯末／沙子双组分混合物可实现流化．研究了不同粒径、不同配比混合物的流化规律．已有的预测双组分混合物最小流化速度的公式不能应用于锯末／玻璃珠、锯末／沙子双组分混合物．同时研究了球形、椭圆形菜籽的最小流化速度，并研究了不同粒径菜籽与不同粒径沙子在不同比例下的最小流化速度。

Since most biomass materials do not fluidize,they do not show minimum fluidization velocity,therefore,the existing correlation for minimum fluidization velocity of binary mixtures can not be used for systems containing biomass materials.The minimum fluidization velocity of such systems were studied using sand/sawdust and glassbeads/sawdust.The range of mass ratio in which the binary mixtures can fluidize was determined.Meanwhile,the minimum fluidization velocity for sand/vegetable seeds mixtures were also studied,the u mf of these mixtures can be predicted by Chiba′s equation.