维多利亚褐煤的机械热压脱水过程研究  

Process of Mechanical / Thermal Dehydration of Victorian Lignite

作　　者：贺琼琼[1,2] 苗真勇[1,2] 万克记 黄少萌[1,2] 

机构地区：[1]中国矿业大学化工学院,江苏徐州221008 [2]中国矿业大学国家煤加工与洁净化工程技术研究中心,江苏徐州221008

出　　处：《煤炭工程》2015年第12期110-113,共4页Coal Engineering

基　　金：国家重点基础研究发展计划(973计划)(2012CB214900);国家自然科学基金委员会创新研究群体科学基金项目(50921002);国家自然科学基金面上资助项目(51274197)

摘　　要：研究了维多利亚褐煤在机械热压系统中,150℃,3～24MPa梯级压力作用下的脱水过程。结果表明,此条件下,最终得到干基水分0.31g/g干煤的样品,脱水率达到66.3%。热压过程分为主固结和次固结阶段,主固结阶段主要是褐煤颗粒间隙和孔隙中水分脱除,脱水速度快,是造成脱水的主要环节;次固结过程,褐煤骨架蠕变变形造成体积减少,脱水速率不断降低。随压力梯级增加,煤中大孔和中孔逐渐坍塌,脱水难度不断增大,主固结环节和次固结环节的脱水速率均逐步降低,但是直到24MPa,水分仍在降低,未达到150℃脱水终点。The mechanical/thermal dehydration process of Victorian lignite is explored at 150℃ under staged pressure of 3 -24MPa. The dry basis moisture content of the product is 0. 31g/g and the dehydration rate is 66. 3%. The process is comprised of primary consolidation and secondary consolidation, during each pressure stage. Primary consolidation is the main stage of dewatering, in which the inter - particle and intra - particle moisture of lignite was removed with high dewatering rate. In secondary consolidation, creep deformation of lignite skeleton occurs causing additional volume reduction, but the dewatering rate kept declining. As the pressure increases, macropores and mesopores are destroyed gradually, the dewatering resistance grows and the dewatering rate of both stages decreases, and the moisture maintains reducing under 24MPa, which means more moisture can be removed at 150℃.

关 键 词：褐煤 机械热压 脱水过程 固结 孔隙结构 脱水速率 

分 类 号：TD94[矿业工程—选矿] TQ531[化学工程—煤化学工程]