摘要
为了对鼓泡流化床内双组分颗粒混合过程进行更精准的计算流体力学(CFD)数值模拟,结合颗粒动力学理论和欧拉多流体模型,建立以气泡为介尺度的双组分曳力模型,在三维鼓泡流化床反应器中模拟了双组分颗粒的分离和混合过程,并通过实验数据验证该模型的准确性,分析外界操作条件和颗粒物性参数对双组分颗粒的分离和混合过程的影响。结果表明:固相颗粒直径的减小、气体入口表观速度的增大以及床层温度的升高都将会加大两相间曳力的非均质性,固相颗粒混合程度逐渐加大;随着颗粒直径和入口气体表观速度的减小,两相颗粒分离程度加大,混合指数随之减小;颗粒物性和外界操作条件的合理匹配有利于双组分颗粒的分离。
In order to conduct more accurate computational fluid dynamics(CFD)numerical simulation of two-component particle mixing in a bubbling fluidized bed,a two-component drag force model with bubbles as meso-scale was established by combining particle dynamics theory and Euler multi-fluid model.The separation and mixing process of two-component particles was simulated in a three-dimensional bubbling fluidized bed reactor,and the accuracy of the model was verified by experimental data.The effects of external operating conditions and particle properties on the separation and mixing process of two-component particles were analyzed.The results show that the decrease of particle diameter,the increase of apparent velocity of gas inlet and the increase of bed temperature increase the heterogeneity of drag force between the two phases,and the mixing degree of solid particles increases gradually.With the decrease of particle diameter and inlet gas apparent velocity,the separation degree of two-phase particles increases and the mixing index decreases.Reasonable matching of particle properties and external operating conditions is beneficial to the separation of two-component particles.
作者
宋晓皎
王帅
SONG Xiaojiao;WANG Shuai(Department of Energy and Power Engineering,Shanxi Institute of Energy,Jinzhong 030600,China;School of Energy Science and Engineering,Harbin Institute of Technology,Harbin 150001,China)
出处
《中国粉体技术》
CAS
CSCD
2021年第4期120-129,共10页
China Powder Science and Technology
基金
国家自然科学基金项目,编号:51606053
关键词
介尺度曳力模型
双组分颗粒
混合
鼓泡流化床
CFD数值模拟
meso-scale drag force model
two-component particle
mixed
bubbling fluidized bed
computational fluid dynamics numerical simulation
