重庆大学学报2017，Vol.40Issue(2)：37-44,8.DOI:10.11835/j.issn.1000-582X.2017.02.005
不同自燃性煤氧化阶段的表征差异
Characterization difference of coals with different spontaneous combustion tendencies during oxidation stage
摘要
Abstract
Low temperature oxidation experiments of three coal samples with different spontaneous combustion tendencies were carried out.Activation energies and characteristic temperatures of coal oxidation process conversion were obtained by the computational model based on the relationship between CO volume fraction and coal temperature change. With the experimental results of TG-DSC (theremogravimetric analysis-differential scanning calorimetry),the change laws of activation energy and oxidation characteristics of three coal samples in low temperature were analyzed.The results show that 1 )during the low temperature oxidation,the CO generation amount,the oxygen consumption amount and the oxygen consumption rate increase with the enhancement of spontaneous combustion tendency. Temperature inflections that CO generation amount and oxygen consumption rate increase sharply are the same during the experiment of different coal samples.And the stronger the spontaneous combustion is,the lower the temperature inflection is,and the change of CO volume fraction shows obvious stages.2 )The change laws of activation energy of coals with different spontaneous combustion tendencies are significantly different.When coal temperature reaches the active temperature,activation energy decreases rapidly,and the mutation points of activation energy are corresponding to the conversion characteristic temperatures in coal oxidation process.3 )According to the characteristic temperature and the change law of activation energy,the low temperature oxidation process could be divided into four stages,namely surface oxidation, thermal oxidation,accelerated oxidation and deep oxidation.关键词
煤自燃/活化能/CO 体积分数/特征温度/官能团Key words
coal spontaneous combustion/activation energy/CO volume fraction/characteristic temperature/functional group Keywords：coal spontaneous combustion/functional group分类
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余明高,袁壮,褚廷湘,郭品坤,郑凯..不同自燃性煤氧化阶段的表征差异[J].重庆大学学报,2017,40(2):37-44,8.基金项目
国家自然科学基金项目（U1361205，51404090，51574111）；煤矿灾害动力学与控制国家重点实验室自主研究课题重点项目（2011DA105287*ZD201401）。Supported by the National Natural Science Foundation of China（U1361205，51404090，51574111）and Inde-pendent Research Project of State Key Laboratory of Coal Mine Disaster Dynamics &Control（2011DA105287*ZD201401）． （）
