摘要
大型煤仓的堵塞具有普遍性。虽然目前提出了多种煤仓堵塞防治方法,但这些方法的技术实现尚缺少理论和数据支持,煤仓防治堵塞设备的安装及使用仍具有盲目性。基于煤仓中的散煤颗粒相互作用的力学特征,采用离散元方法建立了煤仓中散煤流动特征的仿真模型,模拟研究了散煤在煤仓中的流动特征。基于相似理论,搭建了煤仓实验系统,实验研究了煤仓中的散煤流动特征。结果表明,干燥散煤具有较好的流动性,煤流呈现出漏斗流特征。随着散煤含水量的增大,其流动性逐渐变差。当含水量为3%时,煤仓中散煤的块体流体特征十分明显,卸料口上方形成了拱形,煤仓内散煤丧失了流动性。煤粒的尺寸越大,在煤仓中的流动性越差。因此,必须从煤粒尺寸、含水量和仓筒结构等多个方面共同探究煤仓内散煤的堵塞机制,才能从根本上解决煤仓堵塞问题。
The clogging of large coal bunker is universal.Although a variety of coal bunker clogging prevention methods have been proposed at present,the technical realization of these methods is still lacking of theoretical and data support.Moreover,the installation and use of coal bunker clogging prevention equipment still have blindness.Based on the mechanical characteristics of particle interaction of bulk coal in coal bunker,a simulation model of flow characteristics of bulk coal in coal bunker was established by using discrete element method(DEM),the flow characteristics of bulk coal in coal bunkers was simulated and studied.Based on the similarity theory,a coal bunker experimental system was built to experimentally study the flow characteristics of bulk coal in the coal bunker.The results show that the dry bulk coal have good fluidity and the coal flow shows the characteristics of funnel flow characteristics.With the increase of water content of bulk coal,the fluidity becomes worse gradually.When the water content is 3%,the block fluid characteristics of bulk coal in the coal bunker are very obvious,and an arch shape is formed above the discharge port,causing the bulk coal in the coal bunker to lose its fluidity.The larger the size of coal particles,the worse the fluidity in the coal bunker.Therefore,it is necessary to explore the blockage mechanism of coal particles in the bunker from the aspects of coal particle size,water content and silo structure,so as to fundamentally solve the blockage problem of coal bunker.
作者
姚贺
陶亚男
范俊锴
YAO He;TAO Yanan;FAN Junkai(Chensilou Coal Mine,Henan Longyu Energy Co.,Ltd.,Yongcheng 476600,China;School of Mechanical and Power Engineering,Henan Polytechnic University,Jiaozuo 454003,China)
出处
《煤炭科技》
2024年第5期70-76,81,共8页
Coal Science & Technology Magazine
基金
国家自然科学基金资助项目(52174109)。
关键词
煤仓
堵塞
流动特征
含水量
离散元
coal bunker
clogging
flow characteristics
water content
discrete element method