摘要
为探究氧气浓度与升温速率对煤自燃特性的影响,利用TG/DSC-FTIR联用热分析技术测试3种不同变质程度的煤样在不同氧体积分数和不同升温速率下的放热特性,分析3种煤样在氧化过程中特征温度、热效应及标志性气体产生量等参数的变化规律。结果表明:氧体积分数一定时,升温速率越小,放热峰值、特征温度和指标气体释放峰值越向低温区偏移。在相同升温速率下,随着氧气体积分数的减小,煤氧化放热峰值温度降低;煤自燃指标气体峰值对应的温度逐渐向高温区域移动。煤变质程度增高,煤自燃特征温度呈增大趋势;放热量的峰值降低,对应的峰值温度增大;指标气体释放峰值温度增大,自燃危险性呈降低趋势。
To investigate the effects of oxygen concentration and heating rate on the characteristics of the coal seam spontaneous combustion,exothermic characteristics of three coals with different metamorphism under different oxygen concentrations and heating rates were studied by conducting the TG/DSC experiments combined with Fourier Transform Infrared Spectrometer(FTIR).Besides,variations of the characteristic temperature,thermal effect,and production of index gases during the process of spontaneous combustion as the function of the oxygen concentration and the heating rate were analyzed.It was found that the peak of released heat,the characteristic temperature,and the peak of released index gases shifted to lower temperature zones with the decrease of the heating rate under the condition that the oxygen concentration was the same regardless of coal properties.At the situation where the samples were oxidized at the same heating rate,the temperature corresponding to the released heat peak of coal spontaneous combustion decreased as the oxygen concentration decreased in spite of coal properties.Nevertheless,the temperatures corresponding to peaks of released index gases moved to higher temperature zones when the oxygen concentration was decreased.Further,experimental results indicate that the characteristic temperatures,the peak of released heat,and the temperature corresponding to the peak of released gases during the process of coal spontaneous combustion increased with the increase the coal metamorphic grade when the oxygen concentration in the oxidizing atmosphere and the heating rate were constant.However,the amount of heat released during the process of coal spontaneous combustion decreased when the metamorphism of coal increased.This phenomenon suggests that coal with a lower degree of metamorphism is more likely to be spontaneous combustion when compared to coal with a higher degree of metamorphism under the same conditions.This suggestion is of importance for early identification,prevention,control of coal spont
作者
张玉涛
杨杰
李亚清
史学强
张园勃
林国铖
ZHANG Yu-tao;YANG Jie;LI Ya-qing;SHI Xue-qiang;ZHANG Yuan-bo;LIN Guo-cheng(College of Safety Science and Engineering,Xi'an University of Science and Technology,Xi'an 710054,China)
出处
《安全与环境学报》
CAS
CSCD
北大核心
2023年第1期43-48,共6页
Journal of Safety and Environment
基金
国家自然科学基金项目(51974235,51774233)。
关键词
安全工程
煤自燃
热效应
特征温度
变质程度
指标气体
safety engineering
spontaneous combustion of coal
thermal effect
characteristic temperature
degree of deterioration
index gas
