贫氧环境下褐煤升温氧化特性的实验研究  

Experimental study on temperature-increasing oxidation characteristics of lignite in oxygen-poor environment

作　　者：刘先新 吉晓波 LIU Xianxin;JI Xiaobo(Shanxi Coal Mine Safety Training Center,Taiyuan 030012,China;Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]山西煤矿安全培训中心,山西太原030012 [2]太原理工大学,山西太原030024

出　　处：《煤矿安全》2021年第5期36-41,共6页Safety in Coal Mines

基　　金：国家自然科学基金资助项目(5184212);2018年度山西省重点研发计划资助项目(201803D053);山西省焦煤集团重大技术攻关资助项目(201812xs06)。

摘　　要：为了研究贫氧环境下褐煤的升温氧化特性,以内蒙古宝日希勒第一煤矿1#煤层煤样为研究对象,利用热重-气相色谱联用技术在不同氧气体积分数下对煤样进行升温氧化实验,得出贫氧环境下褐煤的热特性曲线(TG、DTG、DSC),同时采用Coats-Redfern动力学方程计算了煤样热解阶段和燃烧阶段的活化能。结果表明:贫氧环境对煤升温燃烧的各个阶段产生不同程度的影响;随着氧气体积分数的降低,特征温度T_(3)、T_(4)和T_(max)逐渐增大;吸氧增重阶段增重量和放热量逐渐减小;热解和燃烧阶段的失重量逐渐减少,放热量逐渐降低,活化能呈减小趋势;CO和CO_(2)峰值温度向高温区域偏移且峰值浓度降低。In order to study the temperature-increasing oxidation characteristics of lignite under oxygen-poor conditions,the coal sample of 1#coal seam of Baorixile 1#coal mine was taken as the research object,and the coal samples were subjected to temperature-oxidation under different oxygen concentrations by thermogravimetry-gas chromatography.The thermal characteristic curves(TG,DTG,DSC)of lignite under oxygen-depleted conditions were obtained through experiments.At the same time,the activation energy of pyrolysis stage and combustion stage of coal samples were calculated by Coats-Redfern kinetic equation.The results show that the oxygen-depleted environment has different degrees of influence on each stage of coal combustion.As the oxygen concentration decreases,the characteristic temperatures T_(3),T_(4),and Tmax gradually increase;the weight gain and heat release gradually decrease during the oxygen absorption and weight increase phase;the weight loss,the heat release and the activation energy of the pyrolysis and combustion phases gradually decrease.The peak temperature of CO and CO_(2) shifts to the high temperature region and the peak concentration decreases.

关 键 词：矿井火灾 贫氧环境 升温氧化 热重-气相色谱联用 活化能 

分 类 号：TD752.2[矿业工程—矿井通风与安全]