Abstract

To study the inerting and cooling characteristics of liquid CO₂ in coal mine, the coal samples before and after liquid CO₂ inerting treatment were analyzed and studied. The results of temperature-programmed oxidation experiment show that the coal sample can inhibit the oxidation of coal to a certain extent after liquid CO₂ inerting. The TG-DSC experiment results show that T1 and T2 of treated coal are higher than those of raw coal, which indicates that the desorption and heat absorption of CO₂ has a more obvious effect on the early stage of coal oxidation at low temperature. The characteristic temperature T3 and T4 of L‑CO₂ coal are lower than that of raw coal, indicating that the oxidation rate of raw coal is faster. The T4 of L-CO₂ coal is higher than that of raw coal. The results showed that L-CO₂ inhibited spontaneous combustion of coal. After the coal sample was treated with liquid CO₂, the apparent activation energy of the coal increased slightly. The heat release of raw coal is 10.78% higher than that of treated coal samples. From the point of view of heat change, it shows that raw coal is more prone to spontaneous combustion. Liquid CO₂ has a good cooling and inerting effect on fire prevention.

中文翻译：

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液态CO2抑制煤自燃的研究

摘要

为了研究煤矿井下液态CO ₂惰性化及冷却特性，对液态CO ₂惰性化处理前后的煤样进行了分析研究。程序升温氧化实验结果表明，煤样经过液态CO ₂惰化后能够在一定程度上抑制煤的氧化。TG-DSC实验结果表明，处理后煤的T1和T2均高于原煤，这表明CO ₂的解吸吸热对煤低温氧化早期的影响更为明显。_{L-CO 2}煤的特征温度T3和T4低于原煤，表明原煤的氧化速度较快。_{L-CO 2}煤的T4高于原煤。结果表明，L-CO ₂抑制煤的自燃。_{煤样经液态CO 2}处理后，煤的表观活化能略有增加。原煤的放热量比处理过的煤样高10.78%。从热量变化来看，说明原煤更容易发生自燃。液态CO ₂对防火有良好的冷却、惰化作用。