摘要
气力输送具有清洁安全、空间集约、配置灵活且易于自动化等特点,是颗粒类散体物料常用的绿色输送技术,在化工、食品、制药、能源等多个领域得到广泛应用。同时,该技术也存在输送工艺复杂、颗粒输送状态瞬变且难以准确预测等难题,采用不同输送工艺时物料输送特性的多手段表征和预测一直是该技术的研究热点。本文在综述气力输送系统构成、常用供料装置结构特点的基础上,对计算流体力学与离散元耦合(CFD-DEM)数值模拟方法、常用测量装置和分析方法在气力输送特性研究的应用进行归纳,总结了当前气力输送流型演变、输送系统压力损失等输送特性的相关研究成果,并对气力输送研究进行展望,讨论了未来研究需关注的几个思考点。
Pneumatic conveying has the characteristics of environmentally friendly,operational safety,spatial intensification,flexible configuration,and easy to automate.In addition,this bulk material handling method also has the advantages of quantitative conveying,conveniently dispersing or centralized conveying,and inert gas protection conveying for unstable materials.The aforementioned characteristics prompt pneumatic conveying to a commonly clean conveying technology for bulk materials.At the same time,pneumatic conveying has been widely applied in chemical,food,pharmaceutical,energy industries,and other fields.However,this method also has a few problems,such as high energy consumption,particle degradation,and pipe erosion.The fundamental cause of the disadvantages lies in the complex conveying process,transient state of particle conveying,and difficulty in accurate prediction.Therefore,the multi-means characterization and prediction of material conveying characteristics in different conveying processes have always been the hot points of this technology.It is well known that the equipment composition is the foundation of pneumatic conveying system performance.In addition,the feeding device is one of the most important factors for conveying processes.In this meaning,this work first summarized the structure of the pneumatic conveying system and the structural characteristics of commonly used feeding devices.Then,this work reviews the application and research of the numerical simulation methods including the two-fluid model in the computational fluid dynamics and the coupling simulation of the computational fluid dynamic discrete element method(CFD-DEM).The application conditions,merits,and demerits of the common numerical method are discussed.What is more,the research and application status of measuring devices commonly used in pneumatic conveying are summarized,including electrical capacitance tomography(ECT),pressure determination,and acoustic emission.Meanwhile,the study mainly focuses on flow pattern evolution and pressure loss in the conveying system,as well as some interesting study points of pneumatic conveying,which are well explored.Finally,several thinking points for future research on this technology are discussed.Key learning points:(1)The structure of the pneumatic conveying system and the key installations are summarized.(2)The techniques and analytical methods for studying the characteristics of pneumatic conveying are reviewed.(3)The evolution of the pneumatic conveying flow pattern,the pressure loss of each part of the conveying system and other conveying characteristics are summarized.(4)The research status and prospect of pneumatic conveying technology are summarized.
作者
周甲伟
闫翔宇
郑泽冰
王庆辉
上官林建
Jiawei ZHOU;Xiangyu YAN;Zebing ZHENG;Qinghui WANG;Linjian SHANGGUAN(School of Mechanical Engineering,North China University of Water Resources and Electric Power,Zhengzhou,Henan 450045,China)
出处
《过程工程学报》
CAS
CSCD
北大核心
2023年第5期649-661,共13页
The Chinese Journal of Process Engineering
基金
国家自然科学基金资助项目(编号:52275110,51805166)
河南省科技攻关项目(编号:222102320084)
河南省高等学校重点科研项目(编号:23A460012)
河南省高校科技创新团队支持计划(编号:22IRTSTHN018)
河南省重大科技专项(编号:201110210300)。
