摘要
为探究抓斗卸料过程中的逸尘机理,解决当前港口物料转运过程中存在粉尘外逸严重的难题,搭建抓斗卸料逸出气流在线测试实验平台。采用试验与数值计算相结合的方式,以典型主粮散体颗粒为卸料对象,基于气固两相流理论,探究卸料高度和卸料质量流量对料斗内逸出气流速度的影响映射耦合关系,结合粉尘颗粒逸出过程的运动特性和规律推导出粉尘逸出的临界粒径。结果表明:逸出气流速度峰值与卸料高度成正相关,同一卸料高度下,逸出气流峰值与质量流量成幂函数关系;基于粉体颗粒受力,推导出粉尘颗粒逸出的临界粒径计算公式,并验证公式的计算误差在11%以内;大豆、玉米和小麦卸料时,粉尘颗粒逸出的临界粒径范围分别为160.9~292.5,182.6~359.6,95.1~196.1μm。研究为抓斗式散粮卸料过程中的粉尘控制和抑尘装置设计提供理论支撑。
In order to explore the mechanism of dust escape during the unloading process of grab buckets and solve the problem of severe dust escape during the current port material transportation process,an online testing experimental platform for the escape airflow of grab bucket unloading was built.A combination of experiments and numerical calculations was used to explore the mapping coupling relationship between the impact of unloading height and unloading mass flow rate on the escape airflow velocity inside the hopper by taking typical main grain particles as unloading objects based on the gas-solid two-phase flow theory,and derive the critical particle size for dust escape based on the motion characteristics and laws of the dust particle escape process.The research results indicate that the peak velocity of the escaping airflow is positively correlated with the unloading height.At the same unloading height,the peak value of the escaping airflow is in a power function relationship with the mass flow rate;Based on the force acting on powder particles,a formula for calculating the critical particle size of dust particles escaping is derived,and the calculation error of the formula is verified to be within 11%;Based on experimental data,the critical particle size ranges for dust particle escape during unloading of soybeans,corn,and wheat are 160.9~292.5,182.6~359.6,95.1~196.1μm.The research provides theoretical support for dust control and dust suppression device design in the process of grab bucket bulk grain unloading.
作者
王明旭
宋岳昌
高涛
欧阳江丰
WANG Mingxu;SONG Yuechang;GAO Tao;OUYANG Jiangfeng(School of Electrical and Mechanical Engineering,Henan University of Technology,Zhengzhou 450001,China;Henan Key Laboratory of Grain and Oil Storage Facility&Safety,Zhengzhou 450001,China)
出处
《包装与食品机械》
CAS
北大核心
2024年第2期99-105,共7页
Packaging and Food Machinery
基金
河南省科技研发计划联合基金项目(232103810084)
河南省粮油仓储建筑与安全重点实验室开放课题基金项目(2021KFB02)
河南省教育厅青年骨干教师项目(2020GGJS088)。
关键词
逸出粉尘
抓斗卸料
粮食颗粒
临界粒径
逸尘机理
气固两相流
escaping dust
grab bucket unloading
grain particles
critical particle size
escaping mechanism
gas-solid two-phase flow