摘要
转筒烘干机具备燃料消耗低、处理量大、经济性高等特点,其内部工艺流程不仅与传热传质有关,还涉及复杂的气固两相流动过程,尤其是针对形状特殊的非球形颗粒难度较大.文中采用离散单元法,提出一种处理大量纤丝状生物质颗粒碰撞过程的数值建模新方法.建立了颗粒在转筒烘干机内气固流动的数理模型,对实际转筒烘干机内气固两相流动进行了实验与数值模拟,得出纤丝状颗粒的运动特性和停留时间分布规律.结果表明:无论抄板结构(包含抄板高度和数目)如何变化,纤丝状颗粒的停留时间分布均呈现出正态分布的趋势;颗粒的平均停留时间随抄板高度的增加而增加,随抄板数目的增加而增加,模拟结果与实验值的变化趋势一致.
Rotary dryers have characteristics of low fuel consumption,large processing capacity and low price,which have been extensively employed in energy and chemistry industries.Usually,heat and mass transfer between gas and solids and gas-solid flow occurr in a rotary dryer.Especially for flexible filamentous particles,the particle-gas flows are extremely complex during drying processes.In this paper,based on discrete element method,a new numerical simulation method on particle impact was proposed to study characteristics of a large number of flexible filamentous particles.A mathematical model on particle-gas flow in a rotary dryer was developed,and the movement characteristics of flexible filamentous particles were studied.The research results showed that residence time of flexible filamentous particles had obvious normal distribution under several conditions of flight structure,which included flight height and number.The mean residence time of flexible filamentous particles increased with the increasing of flight height and flight number,which were consistent with experimental results.
作者
顾丛汇
姚寿广
袁竹林
GU Conghui;YAO Shouguang;YUAN Zhulin(School of Energy and Power Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China;School of Energy and Environment, Southeast University, Nanjing 210096, China)
出处
《江苏科技大学学报（自然科学版）》
CAS
2020年第4期35-42,共8页
Journal of Jiangsu University of Science and Technology:Natural Science Edition
基金
国家自然科学基金资助项目(51906092)
江苏科技大学科研启动基金项目(1142931709)
2019年江苏科技大学青年科技创新项目(1142921903)。
