Shaqu No.1 Coal Mine,Huajin Coking Coal Co.,Ltd.
North China Institute of Science and Technology

为预防沙曲一号煤矿4502工作面自然发火,提升煤自燃风险防控能力,设计程序升温实验模拟煤自然发火过程,结合独立指标气体分析和多元指标气体分析方法,通过考察O2、CO、CH4、C2H6、C2H4等气体体积分数及链烷比、烯烷比指标随温度的变化规律,优选煤自燃标志气体,确定煤自然发火临界温度及干裂温度,研究沙曲一号煤矿3+4#煤层自燃特性。结果表明,在临界温度前,耗氧速率、CO浓度、φ(C2H6)/φ(CH4)增长平缓,C2H6、C3H8少量产出,在临界温度后耗氧速率、CO浓度呈指数规律快速增长,φ(C2H6)/φ(CH4)则产生突变上升;C2H4出现于100℃,烷烃释放量在100~110℃大幅增加,之后φ(C2H4)/φ(CH4)规律性单调上升,φ(C2H4)/φ(C2H6)和φ(C2H4)/φ(C3H8)则先降低后升高;C2H2出现于240℃,远高于干裂温度。总结得出耗氧速率、CO、C2H4、C2H2可作为煤自燃主要预测指标,C2H6、C3H8浓度、φ(C2H6)/φ(CH4)和烯烷比可作为煤自燃辅助判断手段,3+4#煤层煤样临界温度为75~85℃,干裂温度为100~110℃。

In order to prevent the coal spontaneous combustion of the 4502 working face of Shaqu No.1 CoalMine and improve the risk prevention and control ability of coal spontaneous combustion,the programmed temperature experiment is designed to simulate coal spontaneous combustion,combined with the single index gasanalysis and the composite index gas analysis method,by investigating the changes of O2、CO、CH4、C2H6、C2H4 and other gas volume fractions,alkane ratio and alkene-alkyl ratio indexes with temperature,the coal spontaneous combustion marker gas is optimized,and the critical temperature and dry cracking temperature of coalnatural ignition are determined.The spontaneous combustion characteristics of 3+4# coal seam in Shaqu No.1Coal Mine are studied.The results showed that before the critical temperature,the oxygen consumption rate, CO concentration and φ(C2H6) / φ(CH4) increased slowly,C2H6 and C3H8 produced a small amount,and theoxygen consumption rate and CO concentration increased exponentially after the critical temperature,while theφ(C2H6) / φ(CH4) increased abruptly.C2H4 occurs at 100°C,and the release of alkanes increases significantly at 100~110°C,after which φ(C2H4) / φ(CH4) increases regularly,while φ(C2H4) / φ(C2H6) and φ(C2H4) / φ(C3H8) decrease first and then increase.C2H2 occurs at 240°C,which is much higher than thecracking temperature.It is concluded that the oxygen consumption rate,CO,C2H4 and C2H2 can be used as themain predictive metrics for coal spontaneous combustion,and the concentrations of C2H6 and C3H8,φ(C2H6) / φ(CH4) and alkene-alkyl ratio can be used as auxiliary means for coal spontaneous combustion,and the criticaltemperature of 3+4# coal seam coal samples is 75~85°C,and the dry cracking temperature is 100~110°C.

中央高校基本科研业务费资助项目(3142023053);2024年河北省在读研究生创新能力培养资助项目(CXZZSS2024158)