Study on primal CO gas generation and emission of coal seam

The main method of casting coal spontaneous combustion is prediction of index gases, with carbon monoxide(CO) commonly used as an index gas. However, coal spontaneous combustion is not the sole source of CO evolution; primal CO is generated through coalification, which can lead to forecasting mistakes. Through theoretical analysis, primal CO generation and emission from coal seams was determined.In this study, six coal samples were analyzed under six different experimental conditions. The results demonstrated the change in coal seam primal gas and concentration as functions of time, different coal samples, occurrence, various gas types and composition concentration, which are in agreement with the previous study on primal CO generation. Air charging impacts on primal gas emission. Analysis of the experimental data with SPSS demonstrates that the relationship between primal CO concentration and time shows a power exponent distribution.

综放工作面采空区遗煤自燃防控研究

针对塔山煤矿综放工作面采空区存在遗煤量大,漏风严重以及由其引起的采空区内遗煤自燃等问题,通过物理实验和CFD数值模拟,研究了高效复合泡沫对采空区遗煤自燃的防控效果。结果表明:遗煤自燃的指标性气体为CO;高效复合泡沫的堆积高度受倾角变化的影响较小,受灌注流量影响较大;灌注流量对高效复合泡沫扩散宽度具有一定程度的影响,但不如工作面倾角对其的影响大;高效复合泡沫具有灭火效率高,可向高处堆积,灭火后不易复燃的特点。该研究成果为塔山矿综放工作面采空区遗煤自燃的防控提供了一定的理论指导。

基于大型煤隔热氧化的银洞沟煤矿110108工作面自燃标志气体优选

为了提高银洞沟煤矿110108工作面自燃预测预报准确性,采用大型煤隔热氧化装置模拟煤自然发火过程,对隔热氧化过程中煤温、产生气体成分及浓度等参数进行分析,最终优选出标志气体。实验结果表明:110108工作面煤最短发火期为35 d;CO在煤氧复合初始阶段便开始出现,并贯穿整个实验过程;当煤温达到99.5℃时,O2消耗速率加快,CO、CO2生成量也随之加大,混合气体开始出现烷、烯烃类气体,乙烯(C2H4)的出现表明煤已进入加速氧化阶段,故该煤层自然发火的临界温度为99.5℃,并确定C2H4作为该煤层的标志气体,同时结合CO相对量变化趋势对煤矿自燃进行早期的预测预报。