摘要
为研究煤尘层最低着火温度随煤样变质程度、煤尘粒径及煤尘层厚度的变化规律,采用煤尘层最低着火温度测定系统进行实验研究,结果表明:随着煤样由褐煤到无烟煤变质程度逐渐增大,煤尘层最低着火温度由290℃上升到400℃以上,同时,褐煤、长焰煤、不粘煤、气煤煤尘层着火时观察到明显的火焰。随着煤尘粒径不断减小,不同煤质的煤尘层最低着火温度明显减小,煤尘层厚度为15mm时,随着煤尘粒径由0.5mm减小至0.075mm,不同煤质煤尘层最低着火温度分别减小了31.0%、26.7%、28.1%、25.8%、28.6%、27.8%、18.9%和15.0%,煤尘粒径影响作用十分显著。随着煤尘层厚度的增大,不同煤质在不同粒径下的煤尘层最低着火温度都减小,其中无烟煤的变化最不明显。
In this paper we studied the variation of the minimum ignition temperature of coal dust layer with its metamorphism,particle size and thickness using the minimum ignition temperature measurement system.The results showed that,with the gradual increase of its degree of metamorphism,the minimum ignition temperature of coal dust layer varied from 290 ℃ to above 400 ℃;and that when the coal dust layer of lignite,long flame coal,non-stick coal,gas coal were ignited,an obvious flame was observed;and that,as the coal dust particle size decreased,the minimum ignition temperature of different kinds of the coal dust layer exhibited a significant reduction trend.It was found that when the thickness of the layer is 15 mm,with the particle size decreasing from 0.5 mm to 0.075 mm,the minimum ignition temperature decreased by 31.0%,26.7%,28.1%,25.8%,28.6%,27.8%,18.9%and 15.0%,respectively,indicating a very obvious effect of the coal dust particle size.With the increase of the layer’s thickness,the minimum ignition temperature of different kinds of the coal dust layer exhibited a decreasing trend,while the trend of anthracite was the least significant.
作者
刘天奇
李雨成
罗红波
LIU Tianqi;LI Yucheng;LUO Hongbo(College of Safety Science and Engineering,Liaoning Technical University,Fuxin 123000,China;Key Laboratory of Mine Thermodynamic Disasters and Control of Ministry of Education,Liaoning Technical University,Fuxin 123000,China;Research Center of Coal Resources Safe Mining and Clean Utilization,Liaoning Technical University,Fuxin 123000,China)
出处
《高压物理学报》
EI
CAS
CSCD
北大核心
2018年第3期143-149,共7页
Chinese Journal of High Pressure Physics
基金
国家自然科学基金(51774168
51204089)
辽宁省自然科学基金(201602355)
辽宁省教育厅项目(LJYL002
551610001276)
关键词
煤尘层厚度
着火温度
变化规律
煤尘粒径
thickness of coal dust layer
ignition temperature
change law
coal dust particle size
