Kinetic model research on drying characteristics of artificial magnetite green pellet

人工磁铁精矿生球干燥的动力学模型

In this study,the effects of drying temperature,hot airflow speed and diameter of green pellet on drying rate of artificial magnetite pellet were deeply investigated to clarify the drying characteristics of artificial magnetite green pellet.The results show that the drying process of artificial magnetite green pellet has three stages,accelerated drying stage,constant drying stage and decelerated drying stage.And drying temperature and hot airflow speed both have significant reciprocal effects on moisture ratio and drying rate of green pellet during the drying process.However,the diameter of green pellet has little effect on drying process of green pellet.Then the drying fitting models of Correction Henderson and Pabis,Lewis,Correction Page(III),Wang and Singh are used to describe the drying kinetics of artificial magnetite green pellet.The fitting results indicate that the drying process of artificial magnetite pellet can be described by Correction Page(III)model accurately.Finally,the contrast experiments demonstrate that the fitting model can well describe the actual drying process.

本文研究了干燥温度、热风流速以及生球直径对人工磁铁精矿生球干燥速度的影响,明确了人工磁铁精矿生球的干燥特性。结果表明,生球的干燥过程存在三个阶段,即加速干燥段、恒定干燥段和减速干燥段。在干燥过程中,干燥温度和热风流速对生球含水率和干燥速率变化有显著影响,而生球直径对生球干燥过程影响不大。随后,采用修正Henderson、Pabis、Lewis、修正Page(III)、Wang和Singh的干燥拟合模型来描述人工磁铁矿生球的干燥动力学。模型拟合结果表明,人工磁铁精矿生球的干燥过程符合Page(III)模型。最后,将实际实验数据与模型拟合数据进行对比,结果表明该拟合模型方程可以较好地描述实际生球干燥过程。