Abstract

For fluidized bed drying, the heat and mass transfer process can be modeled by using the volumetric heat transfer coefficient between the drying gas and the particulate matter. Part 1 of this series offered a heat and mass transfer model developed for calculating the particles and drying gas conditions in a fluidized bed dryer. In this part, an algorithm was developed based on this model. The variation of parameters along the height of the dryer and versus drying time can be calculated. The results of the simulation have been validated by using experimental data from a pilot plant fluidized bed dryer with agricultural seeds. We found that the method of determining the logarithmic temperature difference greatly influences the values of the drying parameters and thus the drying time and the height of the desorption zone.

摘要

对于流化床干燥，可以通过使用干燥气体和颗粒物质之间的体积传热系数来模拟传热和传质过程。本系列的第 1 部分提供了为计算流化床干燥器中的颗粒和干燥气体条件而开发的传热和传质模型。在这一部分中，基于该模型开发了一种算法。可以计算参数沿干燥器高度和干燥时间的变化。模拟结果已通过使用农业种子中试工厂流化床干燥器的实验数据得到验证。我们发现，确定对数温差的方法极大地影响了干燥参数的值，从而影响了干燥时间和解吸区的高度。