1. State Key Laboratory of Coal Resources and Safe Mining,Beijing　 100083,China; 2. College of Resources and Safety Engineering,China University of Min-ing and Technology (Beijing),Beijing　 100083,China; 3. State Key Laboratory Cultivation Base for Gas Geology and Gas Control,Henan Polytechnic Univer-sity,Jiaozuo　 454150,China

煤自燃是矿井安全生产中的主要灾害之一,火区启封时的氧化煤复燃问题尤其需要重视。为揭示不同氧化程度煤复燃特性,研究分析氧化煤指标性气体产生规律,并对特征官能团进行吸光度定性分析和峰面积定量分析。结果表明氧化煤自燃倾向性判定指数为Iym<I80℃yh<I40℃yh<I120℃yh<I160℃yh<I200℃yh（ym代表原煤,yh代表氧化煤）,原煤中还原性官能团多于氧化煤,含氧官能团少于氧化煤,低温氧化析出指标性气体速率大于氧化煤,氧化煤较原煤与氧结合能力减弱,煤自燃倾向性降低,80℃氧化10 h后的煤气体析出速率较其他温度更接近原煤,还原性官能团亦接近原煤,煤自燃倾向性更高,更易复燃。基于以上研究,确立了不同氧化程度煤复燃规律。

Spontaneous combustion of coal is one of the main problems in coal mine safe production. The oxidized coal recrudescence should be paid enough attention at the unsealing stage. To reveal the re-ignition characteristics of coal with different oxidation levels,the research was conducted on the development of coal spontaneous combustion at each stage. The test system for spontaneous index gases was developed to analyze the occurrence and development of index gases produced by coal with different oxidation levels,and Fourier transform infrared spectroscopy was used to investi-gate the characteristics of functional group by the qualitative analysis of absorbance and the quantitative analysis of peak area. The results show that the determination index for coal spontaneous combustion tendency is Iym < I80 ℃ yh < I40 ℃ yh

LU Xinxiao,ZHAO Hongru,ZHU Hongqing,et al. Characteristic rule of spontaneous combustion tendency of oxidized coal at recrudescence stage[J]. Journal of China Coal Society,2018,43(10):2809-2816.