化工进展2024，Vol.43Issue(4)：1700-1710,11.DOI:10.16085/j.issn.1000-6613.2023-0656
基于单液滴蒸发的离心喷雾干燥数值模拟
Numerical simulation of centrifugal spray drying based on single-droplet evaporation
摘要
Abstract
In order to analyze the physical field distribution and droplet movement pattern inside centrifugal spray dryer,a three-dimensional steady-state mathematical model of the spray drying process was established by using the Euler-Lagrange method coupling the single-droplet drying model.Experiments were conducted on a pilot-scale centrifugal spray drying system using 70％(wet basis)maltodextrin solution as the feedstock,and the temperature distribution inside the dryer was measured.The results showed that the simulated temperatures at characteristic points agreed well with the experimental values with 1.84％of average relative error,demonstrating the accuracy and reliability of the simulation results.Examination of continuous phase transfer process revealed that the three-dimensional physical field showed a cylindrically asymmetric distribution,having higher temperatures,lower water vapor contents,and greater airflow velocities at the center area of the tower.Analysis of droplet movement trajectory and drying process found that larger droplets had longer drying times,while smaller droplets had shorter drying times but longer residual time due to the occurrence of swirling and backflow.The effects of inlet air temperature,atomization disc rotation speed,and inlet air angle on the physical field distribution and droplet drying behavior inside the tower were studied by simulation,and the mass and heat transfer mechanism of spray drying process were analyzed.关键词
喷雾干燥/数值模拟/单液滴干燥动力学/运动轨迹/传质传热Key words
spray drying/numerical simulation/single-droplet drying kinetics/motion trajectory/mass and heat transfer分类
化学化工引用本文复制引用
祝妍妮,王维,孙闫晨昊,魏岗,张大为..基于单液滴蒸发的离心喷雾干燥数值模拟[J].化工进展,2024,43(4):1700-1710,11.基金项目
国家自然科学基金(21676042) （21676042）
辽宁省自然科学基金(201602167). （201602167）
