CO_(2)抑制高硫煤自燃的实验研究

Experimental research on CO_(2) inhibiting the spontaneous combustion of high sulfur coal

为了研究CO_(2)对高硫煤自燃的抑制特性,选取阳泉高硫无烟煤,进行不同比例φ(O_(2))/φ(CO_(2))气氛下的热重分析实验,从燃烧特性、放热性及活化能角度探究CO_(2)对高硫煤自燃过程的影响。结果表明:随着CO_(2)体积分数增加,高硫煤燃烧的3个阶段温度范围呈"滞后性",放热量和放热速率逐渐减小;着火温度、燃烧温度、最大失重温度随着CO_(2)的增大而增加,CO_(2)抑制了高硫无烟煤燃烧的过程,在惰性气氛下,高硫煤的燃烧性降低,燃烧所需的能量变大。从燃烧性、放热性的降低和活化能的提高,揭示了CO_(2)对高硫无烟煤自燃过程中的抑制性。

In order to study the inhibitory characteristics of CO_(2) on the spontaneous combustion of high-sulfur coal,the highsulfur anthracite from Yangquan was selected to conduct thermogravimetric analysis experiments under different ratios ofφ(O_(2))/φ(CO_(2)),exploring the influence of CO_(2) on the spontaneous combustion process of high-sulfur coal from the perspective of combustion characteristics,heat release and activation energy.The results show that with the increase of CO_(2) concentration,the temperature range of the three stages of high-sulfur coal combustion is“hysteresis”,and the heat release and the rate of heat release gradually decrease;the ignition temperature,combustion temperature and maximum weight loss temperature increase with the increase of CO_(2),which inhibits the combustion process of high-sulfur anthracite.In inert atmosphere,the combustability of high-sulfur coal decreases and the energy required for combustion increases.The inhibitive effect of CO_(2) on the spontaneous combustion of high sulfur anthracite was revealed from the decrease of combustion and exothermic property and the increase of activation energy.