同心和偏心锥形煤斗卸料流动特性研究  

Discharge flow characteristics of concentric and eccentric conical coal hoppers

作　　者：郑智辉 陈国庆 周小明 姜燕妮 ZHENG Zhihui;CHEN Guoqing;ZHOU Xiaoming;JIANG Yanni(College of Mechanical and Electrical Engineering,Hohai University,Nanjing 210024,Jiangsu Province,China;Low-carbon intelligent coal-fired power generation and ultra-net emissions,China Energy Science and Technology Research Institute Co.,Ltd.,Nanjing 210023,Jiangsu Province,China)

机构地区：[1]河海大学机电工程学院,江苏南京210024 [2]国家能源集团科学技术研究院有限公司低碳智能燃煤发电与超净排放全国重点实验室,江苏南京210023

出　　处：《化学工程》2024年第6期64-69,共6页Chemical Engineering(China)

基　　金：国家自然科学基金资助项目(12372261,12102128);低碳智能燃煤发电与超净排放全国重点实验室开放课题(D2022FK096)。

摘　　要：为了研究颗粒在同心锥形煤斗和偏心锥形煤斗中的卸料流动特性,采用离散元法在EDEM软件中建立颗粒离散元模型,对半顶角不同的煤斗进行颗粒卸料流动的数值模拟,对颗粒的质量流量、流动稳定性和煤斗中心线处颗粒速度进行了分析。结果表明:参数条件相同时,偏心锥形煤斗的质量流量大于同心锥形煤斗,同心锥形煤斗存在质量流量变化的临界半顶角,而偏心煤斗不存在明显的临界半顶角;随着半顶角的减小,2种煤斗的质量流量随之增大;偏心锥形煤斗的卸料稳定性优于同心锥形煤斗,但2种煤斗在半顶角大于60°后,变异系数都出现大幅增加;2种煤斗在半顶角为0°—40°时表现为整体流,在半顶角大于60°时表现为中心流。说明偏心锥形煤斗卸料整体性能优于同心锥形煤斗。In order to study the discharge flow characteristics of particles in concentric conical coal hopper and eccentric conical coal hopper.A discrete element model was established in EDEM software to simulate the particle discharge process in hopper with different half-top angles.The mass flow,flow stability and particle velocity at the center line of coal hopper were analyzed.The results show that for the same parameter condition,the mass flow of the eccentric conical coal hopper is greater than the concentric conical coal hopper.The concentric conical hopper has a critical half top angle of mass flow change,while the eccentric conical hopper is not.With the decrease of the half top angle,the mass flow rate of the two coal hopper increase.The discharge stability of eccentric conical coal hopper is better than that of concentric conical coal hopper.When the half top angle of the two coal hopper is greater than 60°,the coefficient of variation increases.The two coal hopper show the integral flow when the half top angle is 0°-40°,and the central flow when the half top angle is greater than 60°.The discharge performance of eccentric conical coal hopper is better than that of concentric conical coal hopper.

关 键 词：离散元法 流动特性 质量流量 临界半顶角 

分 类 号：TQ546[化学工程—煤化学工程] TQ077