摘要
煤的氧化放热特性是影响煤自燃的关键因素之一。为研究煤低温贫氧氧化放热特性,采用C80微量热仪,测试了煤在不同氧浓度环境(5%、9%、13%、17%、21%)中250℃以下的氧化放热热流曲线,分析了初始放热温度、放热量,并计算了表观活化能。结果表明:煤低温氧化初始放热温度随着氧浓度的降低呈波动增大的趋势;放热强度、放热量和表观活化能随着氧浓度的降低而降低,且存在临界氧浓度,使低于该氧浓度时,煤低温氧化放热行为受到明显抑制,实验煤样均存在2个临界氧浓度,分别为13%和9%。
Heat release characteristic of coal oxidation is one of the key factors influencing spontaneous combustion. To investigate the heat release characteristics of coal low-temperature oxidation under oxygen deficient atmosphere, by C80 calvet calorimeter,the heat flow of coal oxidation below 250 ℃ was tested under various atmospheres with 5%, 9%, 13%, 17%, and 21% oxygen concentrations. The initial temperature of heat release and quantity of heat release were analyzed. Furthermore, the apparent activation energy of coal oxidation was calculated. The results show that the initial temperature of heat release of coal fluctuates and increases with the decrease of oxygen concentration, while the intensity and quantity of heat release and apparent activation energy decrease. Moreover, there is a critical oxygen concentration, below which the heat release behaviors during coal oxidation will be inhibited obviously. There are two critical oxygen concentrations for each of the tested coal samples, namely, 13% and 9%.
作者
李青蔚
任立峰
任帅京
LI Qingwei;REN Lifeng;REN Shuaijing(School of Safety Science and Engineering,Xi’an University of Science and Technology,Xi'an 710054,China;Post-doctoral Research Center of Mining Engineering,Xi’an University of Science and Technology,Xi'an 710054,China)
出处
《煤矿安全》
CAS
北大核心
2020年第11期34-38,共5页
Safety in Coal Mines
基金
国家自然科学基金资助项目(51904232)。
关键词
煤自燃
贫氧
低温氧化
放热
表观活化能
coal spontaneous combustion
oxygen deficient
low temperature oxidation
heat release
apparent activation energy
