The effects of varying the mass and volume of ground chip and pellet particles on the particle drying rate were analyzed. Samples of whole pellets and chips were hammer milled using a 3.2 mm screen and the ground chip and pellet particles were found to have similar size distributions, although the pellet particles were denser and more spherical than the chip particles. Prior to drying, water was added to the particles to obtain 0.10, 0.30, 0.50, 0.70, and 0.90 moisture contents (on a dry mass basis). The moistened particles were subsequently dried in a constant temperature thin layer dryer set at 50, 100, 150, or 200 °C under dry pure nitrogen, dry compressed air, or atmospheric air. The chip and pellet particles exhibited similar degrees of shrinkage, but the pellet particles underwent a greater reduction in their bulk volume during drying. It appears that the more spherical pellet particles are prone to shrinkage in more than one direction, whereas the needle-like chip particle shrink only in one direction. A variable radius first order drying model was found to fit the experimental data better than a fixed radius model.

分析了改变碎屑和颗粒颗粒的质量和体积对颗粒干燥速率的影响。使用3.2毫米的筛子对整个颗粒和碎屑样品进行锤磨，发现粉碎的颗粒和颗粒具有相似的粒度分布，尽管颗粒的密度和密度比切屑更球形。在干燥之前，将水添加到颗粒中以获得0.10、0.30、0.50、0.70和0.90的水分含量（以干质量计）。随后将湿润的颗粒在设定为50、100、150或200°C的恒温薄层干燥机中，在干燥的纯氮气，干燥的压缩空气或大气中干燥。碎屑和粒料颗粒表现出相似的收缩度，但是粒料颗粒在干燥过程中其体积减小了更多。似乎更多球形的粒状颗粒倾向于在一个以上方向上收缩，而针状切屑颗粒仅在一个方向上收缩。发现可变半径一阶干燥模型比固定半径模型更好地拟合实验数据。