松散煤体热导率及热扩散率的粒径效应  

Particle Size Effect of Thermal Conductivity and Diffusivity of Loose Coal

作　　者：王文强[1] 杨小彬[1] 刘伟[1] 郭丹丹[1] 何超[1] 

机构地区：[1]中国矿业大学(北京)资源与安全工程学院,北京100083

出　　处：《煤矿安全》2017年第3期28-31,共4页Safety in Coal Mines

基　　金：国家自然科学基金资助项目(5157040498)

摘　　要：松散煤体热导率及热扩散率受各种因素影响,是研究煤自燃的重要参数,对于同一煤体,其热导率及热扩散率主要与粒径有关。应用改良的瞬态平面热源法,可以同时测得材料的热导率及热扩散率。通过对小粒径煤样及混合粒径煤样的测量,得到热导率及热扩散率的变化规律。结果表明:随松散煤体粒径增大,热导率呈现逐渐减小的规律,热扩散率呈现先减小后增大的规律;在加权粒径相同的情况下,混合粒径煤样热导率及热扩散率受小粒径煤样影响。The thermal conductivity and diffusivity of loose coal can be affected by different factors,and they are important parameters to research the spontaneous combustion of coal.But for the same coal,the thermal conductivity and diffusivity are mainly related to particle size.They can be measured meanwhile through the modified transient plane source method.Through the measurement of loose coal with small particle size and mixed loose coal,the change laws were got.The results show that,with the increasing of particle size,thermal conductivity decreases gradually; thermal diffusivity decreases first and then increases.When the weighted size of loose coal is the same,the thermal conductivity and diffusivity of mixed loose coal are affected by loose coal with smaller particle size.

关 键 词：粒径 松散煤体 热导率 热扩散率 瞬态平面热源法 

分 类 号：TD752.2[矿业工程—矿井通风与安全]