摘要
作者在室温至700℃的床温范围内测定了不同粒径、不同筛分宽度及二元混合床料的最小流化速度。对试验结果分析讨论表明,温度通过对流化气体的粘度及密度的作用而对流化特性有显著的影响,其影响规律随床料的平均粒径不同而有明显的差别;二元混合颗粒的流化曲线取决于床料的初始混合状态;温度对宽筛分混合床料的离析有明显影响。
The experiments are carried out in a 188mm diameter fluidized bed at temperature up to 650℃ with the objective of examining the effects of wide size distribution bed materials and of fines concentratiort in particular on bed hydro- dynamic behaviour.These involve measurements of minimum fluidizing velocity. The bed material is sand and the principal tests are undertaken with beds of mean particle sizel.43mm,0.62mm and 0.57mm.Fines used have a mean partiele size of 0.095mm. The initial state of the bed is found to be important for determining the U_(mf) of a binary partiele mixture,because the degree of segregation depends on the operating procedures.Increase in bed temperature reduces bed segregation.
