煤自燃过程中的温升及CO生成特性

发布时间：2018-07-12 15:54

本文选题：煤田火灾 + 盖层厚度　；参考：《燃烧科学与技术》2017年05期

【摘要】：设计搭建了研究煤田火灾的实验模拟装置.采用中心开通孔的耐高温泡沫陶瓷模拟上覆盖层,通过在煤体下端外加热源的方式对煤层加热,研究了盖层表面的温度和生成的CO随煤样温度的变化规律,并测量了煤体温度随时间的变化规律.实验结果表明:盖层厚度的增加可以加快煤低温氧化进程,减少到达快速氧化临界温度所需的时间;根据煤体的升温速率、CO体积分数和盖层标志点温度随煤温的变化规律,可推断出实验用煤样氧化加速的临界温度约为80,℃,CO体积分数与煤样温度近似呈指数式关系.CO体积分数与煤样温度的关系方程可以用来判断煤低温氧化的程度,对煤田火灾的早期探测有一定指导意义.
[Abstract]:An experimental simulation device for the study of coalfield fire was designed and built. In this paper, the high temperature resistant foam ceramic with the center opening hole is used to simulate the upper covering layer, and the coal seam is heated by adding heat source to the lower end of the coal body. The variation of the temperature of the caprock surface and the generated CO with the coal sample temperature is studied. The variation of coal temperature with time is also measured. The experimental results show that the increase of caprock thickness can accelerate the process of coal oxidation at low temperature and reduce the time required to reach the critical temperature of rapid oxidation. It can be inferred that the critical temperature for accelerated oxidation of coal samples is about 80, and the relationship between CO volume fraction and coal sample temperature is approximately exponential. The equation between CO volume fraction and coal sample temperature can be used to judge the degree of coal oxidation at low temperature. It has certain guiding significance for early detection of coalfield fire.
【作者单位】：天津大学机械工程学院;中国矿业大学煤炭资源与安全开采国家重点实验室;
【基金】：中国矿业大学煤炭资源与安全开采国家重点实验室开放基金资助项目(14KF01)
【分类号】：TD752.2

【相似文献】