含水量对煤自燃特性的影响实验研究
Experimental Study on Effect of Water Content on Coal Spontaneous Combustion Characteristics
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摘要: 为有效防治吕家坨5424Z采煤工作面含水煤自燃,通过采用差示扫描量热技术(DSC)与程序升温相结合的方法,分析了不同含水量对煤样吸、放热参数的影响规律。研究表明:水分增量在1%~9%范围内,其热流差零值点温度普遍较高,说明煤样不易发生自燃现象。但在煤样水分增量为1%~4%时,其吸收峰峰值温度较低,且此时吸热速率达到最值,这部分煤样与其他实验水分段相比较易发生自燃现象。随着煤样含水量增大,其产生的CO、CO2的量也逐渐增大,但是差别不明显,说明对煤层增加1%~7%含水量时,能适当促进煤升温氧化、自燃的过程。Abstract: To effectively control the spontaneous combustion of water-bearing coal in 5424Z coal mining face of Lyujiatuo Coal Mine, the influence of different water contents on the adsorption and exothermic parameters of coal samples was analyzed by using differential scanning calorimetry (DSC) and temperature programming method. The research shows that the moisture increase is in the range of 1% to 9%, and the temperature difference of the zero point of the heat flow is generally higher, indicating that the coal sample is not prone to spontaneous combustion. However, when the moisture increase of coal sample is 1% to 4%, the peak temperature of absorption peak is lower, and the heat absorption rate reaches the maximum value at this time. This part of coal sample is more prone to spontaneous combustion than other experimental water sections. As the water content of coal samples increases, the amount of CO and CO2 produced by them increases gradually, but the difference is not obvious. This indicates that when the water content of coal seam is increased by 1% to 7%, the process of warming oxidation and spontaneous combustion of coal can be appropriately promoted.
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