热风及过热蒸汽煤调湿工艺比较  

Comparison Between Hot Air and Superheated Steam Coal Moisture Control Processes

作　　者：吴中华[1,2] 尹建树 刘兵 梁石军 张世博 WU Zhonghua;YIN Jianshu;LIU Bing;LIANG Shijun;ZHANG Shibo(College of Mechanical Engineering,Tianjin University of Science and Technology, 300222 Tianjin,China;International Joint Research Center of Low- carbon Green Process Equipment,300222 Tianjin,China)

机构地区：[1]天津科技大学机械工程学院,天津300222 [2]天津科技大学低碳绿色过程装备国际联合研究中心,天津300222

出　　处：《煤炭转化》2018年第6期29-35,共7页Coal Conversion

基　　金：国家自然科学基金资助项目(31471618)；国家重点研发计划项目(2017YFD0400904-4).

摘　　要：针对现有热风和烟道气煤调湿工艺存在易爆风险的问题,提出了一种过热蒸汽为干燥介质的煤调湿新工艺.利用自制穿流干燥装置,以热风和过热蒸汽为干燥介质对炼焦煤进行干燥调湿.研究了不同干燥介质温度、料层厚度和干燥介质流量条件下的炼焦煤干燥特性,计算了热风和过热蒸汽煤调湿工艺处理单位质量物料所需外部输入能耗,绘制了炼焦煤水分变化曲线和能耗分布等值图.结果表明:提高干燥介质温度、减少料层厚度、增大干燥介质流量均有利于炼焦煤干燥,缩短煤调湿过程时间;相比于热风干燥介质,利用过热蒸汽对炼焦煤进行调湿,调湿速率可提高40%以上,能耗可降低35%以上.Hot air or flue gas are usually used as the drying media in the existing coal moisture control(CMC)process,which may cause explosion danger due to the oxygen in the drying media.To avoid this possible explosion,a new coal moisture control process was proposed where the superheated steam is used as the drying medium.The hot air and superheated steam drying experiments of the coking coal were carried out using a self-made through-flow drying setup respectively.Parametric studies were conducted to study the effect of the drying medium temperatures,layer thicknesses,and drying medium flow rates on the drying characteristics of coking coal.Based on the experimental data,the energy consumptions per unit mass material were calculated and compared for the hot air and superheated steam coal moisture control processes.Meanwhile,the corresponding drying curves and the equivalent map of energy consumption distribution were drawn.The results show that increasing the temperature of the drying medium,reducing the thickness of the material layer,and increasing the flow rate of the drying medium are all beneficial to the drying of the coking coal and can shorten the time of coal moisture control process,which reduces the coal moisture content from initial 12%to 6%;compared to the hot air drying medium,the superheated steam can increase the rate of moisture control by more than 40%,and reduce the energy consumption by more than 35%.

关 键 词：炼焦煤 煤调湿 热风干燥 过热蒸汽干燥 能耗 

分 类 号：TQ520[化学工程—煤化学工程] TD849[矿业工程—煤矿开采]