呼伦贝尔褐煤等温干燥过程  

Drying process of Hulun Buir brown coal under isothermal condition

作　　者：孙晓林[1] 郭晓镭[1] 陆海峰[1] 龚欣[1] 

机构地区：[1]华东理工大学煤气化及能源化工教育部重点实验室,上海煤气化工程技术研究中心,上海200237

出　　处：《化工学报》2015年第7期2628-2635,共8页CIESC Journal

基　　金：中央高校基本科研业务费资助~~

摘　　要：以水分含量高达40%的呼伦贝尔褐煤煤粉为实验物料,利用热重法研究了等温条件下的干燥特性,对比分析了温度、颗粒粒度对干燥过程的影响。实验结果表明,呼伦贝尔褐煤干燥过程具有明显的恒速干燥阶段,其特征与干燥温度和自由水含量密切相关。获得了呼伦贝尔褐煤煤粉在不同温度和粒度条件下的临界含水量(MCcr)和平衡含水量(MCeq),发现随着颗粒粒度的减小,褐煤煤粉干燥速率略有增大,但当粒度较小时,粒度因素对干燥过程的影响不明显。MCcr与MCeq均随温度的升高而减小,而随着颗粒粒度的减小,MCcr略有降低,MCeq略有增大。实验结果可以为褐煤制粉干燥工艺条件的选择和优化提供依据。The drying characteristics under isothermal condition of Hulun Buir pulverized brown coal with high moisture content of 40% was studied using thermo-gravimetric method. The effects of drying temperature and particle size on drying process were analyzed. The results showed that the constant rate stage was obviously observed, and the characteristics were closely related to drying temperature and free water content. The critical （MCcr） and equilibrium （MCeq） moisture content were obtained. The drying rate decreased with the decrease of particle size, but the effect of particle size was not obvious when the coal particle was enough small. MCcr and MCeq decreased with the increase of temperature, however, MCcr increased and MCeq decreased slightly with the decrease of particle size. The experimental results could provide a basis of selection and optimization of brown coal powder and drying process.

关 键 词：褐煤煤粉 干燥温度 颗粒粒度 恒速干燥阶段 临界含水量 

分 类 号：TQ028.8[化学工程]