摘要
为研究不同煤质煤尘云最低着火温度变化规律,选取褐煤、长焰煤、不黏煤、气煤、焦煤、瘦煤、贫煤和无烟煤8种煤质煤样,采用煤尘云最低着火温度测试装置,研究了煤尘云最低着火温度随变质程度、粒径及混入惰性岩粉量的变化规律。研究结果表明:①煤样变质程度越低,受限高温空间内煤尘云越容易着火,煤尘云爆炸潜在危险性越大;煤尘云着火过程是可燃气相环境主导的。②随着粒径在75μm到25μm范围内减小,8种煤质煤尘云最低着火温度均不断减小,褐煤尘云最低着火温度最大降幅最大,达18.6%,说明褐煤尘云最低着火温度受粒径影响最大;空干基挥发分越大且煤尘半径越小,煤尘云越容易着火;在“敏感粒径区间”内褐煤尘云最低着火温度降幅最大,达8.47%。③向煤尘中混入不同比例的惰性CaCO3岩粉对8种煤质煤尘云着火现象均有明显抑制作用。
In order to research the minimum ignition temperature variation law of coal dust cloud with different coal quality, eight coal samples including lignite, long-flame coal, non-caking coal, gas coal, charred coal, lean coal, meagre coal and anthracite were selected to analyze the minimum ignition temperature variation laws of coal dust cloud with metamorphism degree, particle size and mixing inert rock powder proportion by use of the minimum ignition temperature testing device of coal dust cloud. The research results show that:① The lower the metamorphism degree is, the more easily the coal dust cloud in a restricted high temperature space catches fire, and the greater the potential explosion danger is. The coal dust cloud ignition process is dominated by flammable gas phase environment.② With the particle size decreasing from 75 μm to 25 μm, the minimum ignition temperature of coal dust cloud of eight coal quality decreases continuously, and the largest drop of the minimum ignition temperature of lignite dust cloud is the largest of 18.6%, which indicates that lignite dust cloud is the most affected by particle size. The larger the air dried basis is and the smaller the particle size of coal dust is, the more easily the coal dust cloud catches fire. In "sensitive particle size range", the minimum ignition temperature of lignite dust cloud decreased the most by 8.47%.③ Mixing inert CaCO 3 rock powder with different proportions into eight coal dust has a significant inhibitory effect on coal dust cloud ignition.
作者
刘天奇
LIU Tianqi(School of Safety Engineering, Shenyang Aerospace University, Shenyang 110136, China)
出处
《工矿自动化》
北大核心
2019年第9期80-85,共6页
Journal Of Mine Automation
基金
国家自然科学基金资助项目(51774168,51675133)
辽宁省教育厅青年科技人才“育苗”项目(JYT19038)
沈阳航空航天大学引进人才科研启动基金项目(18YB25)
关键词
煤尘爆炸
煤尘云着火
最低着火温度
煤尘变质程度
煤尘粒径
惰性岩粉
coal dust explosion
coal dust cloud ignition
the minimum ignition temperature
metamorphism degree of coal dust cloud
particle size of coal dust
inert rock powder
