提高粉体堆积密度的理论与实验研究

THEORETICAL AND EXPERIMENTAL ANALYSIS OF IMPROVING THE PACKING DENSITY OF POWDER

以Andreason理论和可压缩堆积模型为基础,对水煤浆颗粒进行了调质计算和堆积效率计算,通过实验验证了计算结果的准确性,探讨了粒度范围和添加量等因素对堆积效率的影响.结果表明,通过调质可以实现煤粉粒度分布的优化,使其尽可能靠近紧密堆积理论所规定的粒度分布特征;用可压缩堆积模型可以很好地预测粉体颗粒的堆积密度,经过调质后原料的堆积效率提高了6.0%;紧密堆积条件下,增大水煤浆颗粒粒度范围有利于提高其堆积效率;随着调质料的增加,系统堆积效率增大,且逼近紧密堆积条件下的堆积效率;只添加细粉时,堆积效率与原料的粒度组成相关.

Based on the theory of Andreason and compressible packing model, the calculations of modifying and packing density of the coal particles have been carried out , and the calculation results have been also verified by experiments. Meanwhile, the influences of the size range and adding volume on packing density has been discussed. The result indicated that the particle size distribution can be optimized by modifying, and it is close to the one of close packing; the packing density of coal particles are well predicted with compressible packing model and it is increased by 5. 977% after modifying; under the condition of close packing, the large size range is helpful for improving the packing density of the system; with the increasing of modifying material, the packing density is also increasing and it is close to the packing density under close packing; just adding power,the packing efficiency is relevant with partile size composition of raw materials.