煤自燃降温过程实验研究

Experimental Study on Spontaneous Cooling Process of Coal

为研究煤自燃后火区降温过程,使用XK-Ⅶ型煤低温自然发火实验台对煤样的自然升温、降温过程进行模拟实验。对比分析了升温过程和降温过程的煤温、高温点运移、指标气体及气体比值的变化规律。实验结果表明:煤自燃升温过程和降温过程具有非对称性;升温阶段与降温阶段温度变化规律均具有分段性;降温阶段高温点向回风侧深部移动,与升温阶段相反;烷烃气体降温阶段的消失温度较升温阶段的出现温度高;降温过程中CO/O_2、CO_2/CO比值较升温阶段对应温度大。

In order to study the cooling process of fire zone after coal spontaneous combustion, we used XK-~ coal spontaneouscombustion experiment device to research spontaneous heating, cooling process of coal samples. We comparatively analyzed thecoal temperature variation, migration of hot spots, index gases and gas ratio of heating process and cooling process. The resultsshow that the heating process and cooling process of coal spontaneous combustion is asymmetrical; the temperature variation lawsof heating process and cooling process both have segmentation; the maximum temperature point moves to the deeper of the returnair side in the cooling process, in contrast to heating stage; disappearance temperature of alkane gas in cooling process is higherthan that of the heating process; ratio of C0/02, COJCO in cooling process is higher than that of the heating process at thecorresponding temperature.