中国安全科学学报 ›› 2019, Vol. 29 ›› Issue (11): 77-82.doi: 10.16265/j.cnki.issn1003-3033.2019.11.013

• 安全工程技术科学 • 上一篇    下一篇

TG-DSC联用研究瓦斯气氛对煤自燃热特性的影响

娄和壮1, 贾廷贵1,2 副教授   

  1. 1 辽宁工程技术大学 安全科学与工程学院,辽宁 阜新 123000;
    2 内蒙古科技大学 矿业与煤炭学院,内蒙古 包头 014010
  • 收稿日期:2019-08-20 修回日期:2019-10-19 发布日期:2020-10-30
  • 作者简介:娄和壮 (1995—),男,辽宁庄河人,硕士研究生,主要研究方向为矿井火灾防治理论及技术。E-mail:qililhz0405@126.com。
  • 基金资助:
    辽宁省教育厅基金资助(LJ2017FAL002);辽宁省大学生创新创业训练计划项目(20171014700017)。

Study on thermal characteristics of coal spontaneous combustion in gas atmosphere by TG-DSC coupling techniques

LOU Hezhuang 1, JIA Tinggui 1,2   

  1. 1 School of Safety Science and Engineering, Liaoning Technical University, Fuxin Liaoning 123000, China;
    2 Institute of Mining and Coal, Inner Mongolia University of Science and Technology, Baotou Inner Mongolia 014010, China
  • Received:2019-08-20 Revised:2019-10-19 Published:2020-10-30

摘要: 为表征瓦斯气氛下煤自燃热特性,运用热重分析法和差示扫描量热法(TG-DSC)联用试验研究不同瓦斯体积分数下煤自燃过程;分析瓦斯影响下的煤自燃特征温度点、失重量、放热量参数的变化特征,获得瓦斯气氛下煤增重阶段与燃烧阶段动力学参数。结果表明:随着瓦斯体积分数的增高,失重量降低,放热量减小,煤氧复合速率放缓;煤自燃过程分为蒸发脱附、增重和燃烧3个阶段;在煤增重阶段,活化能、活化因子随瓦斯体积分数的增加而增加,整体变化不大;在煤燃烧阶段,活化能、活化因子随瓦斯体积分数的增加而减小。

关键词: 煤自燃, 瓦斯气氛, 特征温度点, 热特性, 活化能, 活化因子

Abstract: To characterize the thermal characteristics of coal spontaneous combustion in gas atmosphere, the thermal gravimetric analysis and differential scanning calorimetry (TG-DSC) were used to study the process of coal spontaneous combustion under different gas volume fractions. The change of parameters such as characteristic temperature, weight loss and heat release of coal spontaneous combustion under the influence of gas were analyzed. The dynamic parameters of weight gain and combustion stages of coal in gas atmosphere were obtained. The results show that with the increase of gas volume fraction, the weight loss and heat release decrease and the coal-oxygen recombination rate slowes, that the process of coal spontaneous combustion is divided into three stages: evaporation desorption, weight gain and combustion, that activation energy and activation factor increase with the increase of gas volume fraction in the low temperature oxidation stage of coal, but the whole change is not obvious, and that activation energy and activation factor decrease with the increase of gas volume fraction in the combustion stage of coal.

Key words: coal spontaneous combustion, gas atmosphere, characteristic temperature, thermal properties, activation energy, activation factor

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