基于温差分析的煤氧化规律研究  

Research on coal oxidation based on the analysis of temperature variation

作　　者：路长[1] 谢艳鹏[1] 李芳[1] 潘荣锟[1] 余明高[1] 

机构地区：[1]河南理工大学瓦斯地质与瓦斯治理省部共建国家重点实验室培育基地,河南焦作454003

出　　处：《安全与环境学报》2014年第6期56-60,共5页Journal of Safety and Environment

基　　金：国家自然科学基金项目(50906023;51304070);河南省基础与前沿技术研究计划项目(092300410045);河南省高等学校青年骨干教师资助计划项目(2011GGJS-051)

摘　　要：低温条件下,煤氧复合作用所产生的热量会使煤体温度升高,甚至发生自燃。为确定煤的氧化性特征,对煤样进行加热升温试验,在程序控制炉中采用相同的线性升温条件(以2℃/h的速率从20℃升至125℃)进行试验,研究通入空气、煤氧化变质程度及不同煤样的影响。采用温差分析方法对煤样升温数据进行处理,分析煤样的低温氧化特点和规律。结果表明,在升温过程中,升温速率曲线呈现增大、减小、再次增加的规律。通入空气煤样的升温速率曲线要高于不通空气的升温速率曲线,新鲜煤样的升温速率曲线要高于氧化变质煤样的升温速率曲线,易自燃煤样的升温速率曲线要高于难自燃煤样的升温速率曲线。理论分析表明,升温速率曲线数值大小反映了氧化放热率的强弱。升温速率曲线间的差值越大,则氧化放热率相差越大。因此,在相同的控制升温条件下,不同煤样的升温速率曲线数值大小可有效地反映自燃性的相对强弱。This paper intends to focus our research on the characteristic features of the coal oxidation at low temperatures. As is known, at low temperatures, heat released by chemical combination of coal and oxygen tends to result in the self-combustion of the coal body, even leading to some spontaneous combustion disasters. In order to clarify the liabilities of coal spontaneous combustion, we have man- aged to keep on with our experiments in an oven in a linear way to heat up our coal samples. While keeping recording the temperatures on, we have been implementing all our experiments in a programcontrolled oven at the same linear-heating rate of 2 ℃/h, from 20 ℃ to 125 ℃ . At the same time, we have also done a series of contrastive experiments, in which the coal samples were tested and compared with and without the air to be provided to the samples under study. Whereas a kind of fresh coal sample was used to be compared with that of the oxidized deteriorating sample, another kind of coal sample could be used to compare with that of its oxidized deteriorating rate. In addition, the temperature difference method can be used to analyze the experimental data, so as to make clear the exothermic characteristics and the rules of coal oxidation. At this point, we have worked out the temperature difference curve of the coal oxidation regularity, which indicates that the coal oxidation tends to increase firstly and then decrease, and, finally, tends to increase again with the rising of temperature. In addition, the temperature difference curves can also be used for the case with the higher air input than for those with no air in. However, the temperature difference curves for the fresh coal sample proves to be higher than those of the oxidation-deteriorated sample. What is more, the temperature difference curves of the coal prone to spontaneous combustion prove to be higher than those of the coal hard to spontaneous combustion. According to the spontaneous combustion theory, the temperature difference curve can be used to re

关 键 词：安全工程 煤自燃 温差 氧化 

分 类 号：X936[环境科学与工程—安全科学]