摘要
为了探究二次氧化作用对煤自燃特性的影响,降低矿井采空区遗煤复燃的风险,以平煤六矿22290工作面原始煤样和氧化煤样为二次氧化研究对象,分析气体产物产生规律,测试二次氧化前后煤样特征温度以及二次氧化前后煤样内官能团的数量变化规律。研究结果表明:二次氧化煤样的CO和C_(2)H_(4)产生速率较原煤更快、放热强度也高于原煤,而且氧化煤样的临界温度、干裂温度、最大增速温度、失重温度均低于原煤;微观结构分析表明,二次氧化煤样中的含氧官能团-OH、-COOH和-C=O含量与原煤相比均有明显增加,而甲基和亚甲基的含量有略微下降。二次氧化煤具有更强的低温氧化性,更容易发生氧化自燃。
In order to explore the effect of secondary oxidation on the spontaneous combustion characteristics of coal and reduce the risk of re-ignition of coal left in the goaf,the original coal samples and oxidized coal samples from the 22290 working face of Pingdingshan Mining No.6 Mine.The characteristic temperature of coal samples before and after secondary oxidation and the number of functional groups in coal samples before and after secondary oxidation were tested.The research results showed that the production rate of CO and C_(2)H_(4) of the secondary oxidized coal sample was faster than that of the raw coal,and the exothermic intensity was also higher than that of the raw coal.Compared with the raw coal,the microstructure analysis showed that the contents of oxygen-containing functional groups-OH,-COOH and-C=O in the secondary oxidized coal samples were significantly increased compared with the raw coal,while the contents of methyl and methylene were significantly higher than those of the raw coal.Secondary oxidized coal had stronger low-temperature oxidizing properties and was more prone to oxidative spontaneous combustion.
作者
刘付俊
周思博
LIU Fu-jun;ZHOU Si-bo(No.6 Mine of Pingdingshan Tian′an Coal Industry Co.,Ltd.,Pingdingshan 467091,China;School of Safety Engineering,China University of Mining and Technology,Xuzhou 221116,China)
出处
《煤炭科技》
2022年第2期43-47,共5页
Coal Science & Technology Magazine
基金
中国博士后基金(2021M703493)
江苏省博士后科研资助计划资助(2021K020A)
徐州市科技项目青年科技人才项目(KC21038)。
关键词
二次氧化
煤自燃
特征参数
特征温度
官能团
secondary oxidation
coal spontaneous combustion
characteristic parameter
characteristic temperature
functional group
