摘要
复合指标气体受环境因素影响较小,能对矿井煤自燃的发生进行及时准确的预报。应用煤恒温氧化装置,模拟采空区蓄热环境,研究采空区遗煤发生氧化反应时指标气体的生成特性,实验选用不同粒径的官地矿焦煤煤样。研究结果表明,随温度增加,H_2/CH_4、O_2/(CO+CO_2)比值减小,CO/CO_2的比值增大,且温度超过80℃后,上述比值会发生剧烈变化。随煤样粒径减小,H_2/CH_4、CO/CO_2比值增大,O_2/(CO+CO_2)比值减小,粒径越小,比值变化趋势越明显。煤样在150℃温度下加热60 min后,复合指标气体比值变化率发生较大改变,这段时间是煤由快速氧化到自燃的关键时期。
The composite index gas is less affected by environmental factors and it could timely and accurately predict the coal spontaneous combustion process. In this paper, by using the constant temperature oxidation device, the heat storage environment of the goaf was simulated to study the generation characteristics of the index gas in the oxidation reaction time of the residual coal in goaf. The experiments were conducted with different sizes of coal samples in Guandi Coal Mine. Results of experiment show that the temperature increases, the specific values of O2/（CO＋CO2）and H2/CH4 decrease, the specific value of CO/CO2 increases, when the temperature is over 80 ℃, the specific value will change dramatically. With the decrease of particle size, the specific values of H2/CH4 and CO/CO2 increase, and the specific value of O2/（CO＋CO2）decreases. The smaller the particle size is, the more obvious the trend is. When the coal sample is heated at 150 ℃ for about 60 minutes, the change rate of the composite index gas ratio is greatly.
出处
《煤矿安全》
CAS
北大核心
2018年第2期23-26,共4页
Safety in Coal Mines
基金
国家自然科学基金资助项目(51274146)
关键词
煤自燃
恒温氧化
复合指标气体
变化趋势
采空区
实验研究
coal spontaneous combustion
constant temperature oxidation
composite index gas
variation trend
goaf
experimental study
作者简介
安帮（1992-），男，内蒙古鄂尔多斯人，太原理工大学在读硕士研究生，主要从事矿井火源探测及防灭火方面的研究。
