新河煤矿煤自然发火规律实验研究

Experimental Study on the Spontaneous Combustion Law of Coal in Xinhe Coal Mine

为了有效预测预防工作面煤自燃事故,以新河煤矿7312工作面新鲜煤样为研究对象,研究3煤层自然发火规律。通过煤自燃程序升温实验台,对煤体进行了氧化程序升温实验。结果表明:新河煤矿煤样在30℃,空气流量为50.4 mL/min的条件下,可以释放出CO,CO量在9.7×10^(-6)~12.7×10^(-6)之间;在自加热阶段,煤的氧化温度为70℃,从缓慢的氧化过渡到加快的氧化过程。在70℃时,煤样氧化所放出的CO量比常温时高3~4倍,煤炭氧化速率的增加为0.6×10^(-6)~0.8×10^(-6)/℃;二次氧化过程中CO生成率、耗氧速率和最大放热强度较初次氧化时均有所升高,CO_(2)生成率大幅降低。

In order to effectively predict and prevent coal spontaneous combustion accidents in the working face,fresh coal samples from the 7312 working face of Xinhe Coal Mine are taken as the research object to study the spontaneous combustion law of the No.3 coal seam.An oxidation programmed heating experiment is conducted on coal bodies using a coal spontaneous combustion programmed heating experimental platform.The results show that the coal samples from Xinhe Coal Mine can release CO under the condition of 30℃and an air flow rate of 50.4 mL/min,with a CO content between 9.7×10^(-6) and 12.7×10^(-6);In the self heating stage,the oxidation temperature of coal is 70℃,transitioning from slow oxidation to accelerated oxidation process.At 70℃,the amount of CO released by coal samples oxidation is 3-4 times higher than at room temperature,and the increase in coal oxidation rate is 0.6×10^(-6)-0.8×10^(-6)/℃;During the secondary oxidation process,the CO generation rate,oxygen consumption rate,and maximum exothermic intensity all improve compare to the initial oxidation,while the CO_(2) generation rate significantly decreases.