摘要
为探究煤二次氧化的自燃特性,采用热重、红外光谱联用的实验方法,对原煤样及预氧化煤样进行对比研究,结果表明:原煤样及预氧化煤样的总反应历程相似;随着煤的预氧化程度的加深,煤样燃点之前的特征温度先降低后增高,燃点之后的特征温度变化则不明显;随着煤的预氧化程度的加深,煤样燃点之前的逸出气体量先增加后减少,燃点之后则基本不变;预氧化煤样的活化能比原煤样有所下降,且随着预氧化程度的加深煤样的活化能先降低后增高,其中预氧化至160℃时煤样活化能达到最低。因此,预氧化煤样的氧化性要强于原煤样,更容易发生自燃。
In order to explore the spontaneous combustion characteristics of coal secondary oxidation,a comparative study was carried out on raw coal samples and pre-oxidized coal samples by means of TG-FTIR.The results show that the overall reaction process of raw coal and pre-oxidized coal is similar;with the pre-oxidation degree of coal deepens,the characteristic temperature before the coal sample burning point first decreases and then increases,while the characteristic temperature change is not obvious after the burning point;with the pre-oxidation degree of coal deepens,the amount of gas released before coal sample ignition point first increases and then decreases,while the amount after combustion point basically remains unchanged;activation energy of pre-oxidation coal sample is lower than that of the raw coal sample,the activation energy of coal sample first decreases and then increases with the degree of pre-oxidation deepens,the activation energy reaches the minimum at the preoxidation temperature of 160℃.Therefore,the oxidation property of pre-oxidized coal sample is better than that of raw coal sample,and spontaneous combustion is more likely to occur.
作者
张辛亥
卢苗苗
白亚娥
秦政
ZHANG Xinhai;LU Miaomiao;BAI Ya’e;QIN Zheng(College of Safety Science and Engineering,Xi爷an University of Science and Technology,Xi’an 710054,China;Key Laboratory of Western Mine Exploitation and Hazard Prevention,Ministry of Education,Xi’an 710054,China)
出处
《矿业安全与环保》
北大核心
2018年第5期16-21,共6页
Mining Safety & Environmental Protection
基金
国家自然科学基金项目(U1361129)
关键词
煤自燃
热重红外联用
二次氧化
特征温度
气体产物
活化能
coal spontaneous combustion
TG-FTIR
secondary oxidation
characteristic temperature
gas product
activation energy
