黏结性粗颗粒流动与流态化的研究进展  

Research progress of granular flow and fluidization behavior of coarse cohesive particles

作　　者：李娜[1] 王嘉骏[1] 冯连芳[1] 顾雪萍[1] 

机构地区：[1]浙江大学化学工程与生物工程学系、化学工程联合国家重点实验室,浙江杭州310027

出　　处：《化工进展》2014年第2期298-303,共6页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金(21276222);国家高技术研究发展计划(863计划)(2012AA040305);中央高校基本科研业务费专项资金(2012FZA4024)项目

摘　　要：在石油、化工、食品等多个领域经常需要处理黏结性粗颗粒,颗粒的黏结会严重影响生产效率。本文综述了黏结性粗颗粒的流动、流态化特性以及改善其流化性能的措施。阐述了粗颗粒间的黏结机理以及主要作用力(液体桥力和固体桥力)的研究进展:目前的研究采用实验和数值模拟两种方法,探究湿含量、流体黏度、操作压力等对黏结性粗颗粒的流动混合及其流态化的影响;改善黏结性粗颗粒流化性能主要有提高风速和改造装置等措施。分析表明,对于液体桥力的研究已经比较系统深入,而以固体桥力为主要黏结力的粗颗粒,其黏结机理还有待进一步的发展。指出随着高性能计算技术的发展,新的颗粒间作用力数学模型与离散单元法的耦合,将成为研究黏结性粗颗粒流动及流态化的重要方法。Coarse cohesive particles have been widely used in petroleum , chemical and food industries,but the particle bond behavior would influence production efficiency. The granular flow and fluidization behavior of coarse cohesive particles were summarized,along with the measures to improve the fluidization characteristics. The bonding mechanism,in which the main inter-particle forces were liquid bridge forces and solid bridge forces,was reviewed. According to experimental and numerical studies,amount of moisture,liquid viscosity and temperature could influence the dynamic properties of coarse cohesive particles,and consequently industrial production. Besides,improvement measures of the fluidization characteristics,such as higher gas velocity,equipment modification,were commented. The analysis showed that liquid bridge forces have been researched more systematically and comprehensively,while the bonding mechanism of coarse cohesive particles with solid bridge forces as the main inter-particle forces should be further studied. As with the advance of high performance computing technology,combining the discrete element method with new models of inter-particle forces will be the main and important method to study the granular flow and fluidization behavior of coarse cohesive particles.

关 键 词：颗粒流 流态化 黏结性粗颗粒 颗粒间作用力 离散单元法 

分 类 号：TQ02[化学工程]