聚合物颗粒气流振动耦合作用干燥效果

Drying Effect of Polymer Particles Based on Coupling of Gas Flow and Vibration

针对初始含水率在20%以下,粒径在5~20 mm,密度为1. 2~2 g/cm3的高聚物颗粒的颗粒物料,分阶段对干燥过程中高聚物颗粒含水率变化趋势进行研究,研究气流振动耦合作用对高聚物颗粒物料干燥过程中不同阶段的影响程度,确定物料达到0. 5%~1%的含水率所需要的干燥时间,根据实验结果设计并优化工程实验样机。研究结果表明,在气流振动耦合作用下,含水颗粒物料的干燥过程分为缓慢降速与快速降速2个阶段,分别对应物料表面水与内部结合水的干燥;5~20 mm的含水颗粒物料的含水率从20%降至0. 5%~1%,所需时间为7~12. 5 min;在气流振动干燥状态下,颗粒物料干燥时间比单一热风情况下减少了20%~30%;设计并加工的气流振动干燥样机可以满足实际生产需求。

For the granular material of the high polymer particles with the initial water content below 20%,the particle size of 5~20 mm and the density of 1.2~2 g/cm3,the change trend of the moisture content of the polymer particles during the drying process is carried out in stages.Research,explore the influence of the coupling of airflow vibration on the different stages of the drying process of high polymer pellet materials,determine the drying time required for the material to reach the water content of 0.5%~1%,and design and optimize the experimental prototype according to the experimental results.The research results showed that under the action of air-vibration coupling,the drying process of water-containing granular materials was divided into two stages:Slow deceleration and rapid deceleration,which respectively corresponded to the drying of material surface water and internal combined water;5~20 mm water-containing granular materials.The time required for the water content to decrease from 20%to 0.5%~1%was 7~12.5 min;the drying time of the granular material in the airflow vibration drying state was reduced by 20%~30%compared with the single hot air condition;the designed and processed airflow vibration drying prototype could meet actual production needs.