不同氧浓度下煤体低温氧化过程中物化参数变化规律研究  

Variation of physicochemical parameters of coal during low temperature oxidation under different oxygen concentrations

作　　者：杨德金[1] 杨胜强[2,3] 季广瑞 赵建明 王吉斌[1] YANG Dejin;YANG Shengqiang;JI Guangrui;ZHAO Jianming;WANG Jibin(Shanjiaoshu Mine,Guizhou Panjiang Clean Coal Co.,Ltd.,Panzhou 553533,China;School of Safety Engineering,China University of Mining and Technology,Xuzhou 221000,China;State Key Laboratory of Coal Recourse and Safe Mining,China University of Mining and Technology,Xuzhou 221000,China)

机构地区：[1]贵州盘江精煤股份有限公司山脚树矿,贵州盘州553533 [2]中国矿业大学安全工程学院,江苏徐州221000 [3]中国矿业大学煤炭资源与安全开采国家重点实验室,江苏徐州221000

出　　处：《煤矿安全》2021年第4期39-44,共6页Safety in Coal Mines

基　　金：国家重点研发计划资助项目(2018YFC0807900);中国矿业大学双一流建设自主创新专项计划资助项目(2018ZZCX05)。

摘　　要：为了探究矿井采空区不同氧浓度对煤低温氧化过程的微观特性影响规律,进行煤体在不同氧浓度下的低温氧化实验,通过BEL-MAX型全自动比表面/孔隙分析和蒸汽吸附仪及电子自旋共振波谱仪(ESR),得到不同氧浓度下煤体低温氧化过程中孔隙分布变化特征及自由基变化规律。实验表明:随着氧浓度及氧化温度增加,水分、挥发分、BET比表面积及自由基浓度呈阶段性变化,130℃之后,煤氧复合速度加快,水分及挥发分的不断降低使得煤体孔隙的发育,增加了氧与煤的活性表面接触面积,激活原本不活泼的原生自由基,参与反应并生成更多新的自由基,在200℃的升温区间内自由基浓度(21%)最大上升了12.77×1017/g。In order to explore the effect of different oxygen concentrations in mine goaf on the microscopic characteristics of coal during low temperature oxidation process,we simulated coal oxidation at low temperature under different oxygen concentrations.Through BEL-Max automatic specific surface/pore analysis,steam adsorption instrument and electron spin resonance spectrometer(ESR),the change characteristics of pore distribution and free radicals during low temperature oxidation of coal under different oxygen concentrations were obtained.The experimental results show that with the increase of oxygen concentration and oxidation temperature,moisture,volatile matter,BET specific surface area and free radical concentration change in stages.After 130℃,the recombination rate of coal and oxygen is accelerated,and the continuous decrease of moisture and volatile matter leads to the development of coal pores,increases the active surface contact area between oxygen and coal,activates the original inactive primary free radicals,participates in the reaction and produces more new free radicals.In the heating range of 200℃,the concentration of free radicals(21%)increased by 12.77×1017/g.

关 键 词：低温氧化 孔隙分布 BET比表面积 自由基反应 煤氧复合 

分 类 号：TD752.2[矿业工程—矿井通风与安全]