外在水分对潮湿细粒煤风力分级效果影响的研究  

Study of the influence of surface moisture on effects of air classification of wet fine coal

作　　者：陈小国[1] 王羽玲[1] 杨建国[1] CHEN Xiaoguo;WANG Yuling;YANG Jianguo(China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]中国矿业大学,江苏徐州221116

出　　处：《选煤技术》2022年第3期30-34,共5页Coal Preparation Technology

基　　金：“十二五”国家科技支撑计划资助项目(2014BAB01B02)。

摘　　要：鉴于潮湿细粒煤外在水分引起的液桥力是其团聚的主要原因,而细粒煤的脱附功与其外在水分和粒度有关,为探索外在水分对潮湿细粒煤风力分级效果的影响,基于液桥力的检测,选取内在水分低的河南城郊煤矿无烟煤末煤为试验煤样,采用半工业性新型煤炭干法分级系统对不同全水分的末煤的分级效果进行了研究。研究结果表明:分级效率和分级粒度均随着原料煤全水分的升高而降低;新型煤炭干法分级系统实际分级粒度可达到3 mm以下,可适用于较低分选下限的高灰动力煤的选前分级,也可应用于湿法选煤产品仓上的细粒级分级。The liquid bridging force induced by surface moisture of wet fine coal is the main factor leading to agglomeration of particles,and the desorption work of fine particles is related to moisture content and size of particles.In order to explore the influence on air classification of wet fine coal with different contents of surface moisture,semi-industrial test is made with the small anthracite of Chengjiao Mine of Henan Coal Co.Ltd using a new type of dry classification system.Test result shows that classification size and efficiency tend to decrease all with the increase of moisture content;the system can work with an actual classification size up to 3 mm and the system is suitable for carrying out presizing of high-ash power coal or fine sizing of bunkered wet cleaned products.

关 键 词：干法筛分 风力分级效果 新型煤炭干法分级系统 外在水分 分级效率 分级粒度 

分 类 号：TD941.5[矿业工程—选矿]