二次氧化煤燃烧和灭火过程的实验研究  

Experimental study on combustion and extinguishing of secondary oxidation coal

作　　者：张洋[1] 吴兵[1] 李滕滕 雷柏伟[1] Zhang Yang;Wu Bing;Li Tengteng;Lei Baiwei(School of Emergency Management and Safety Engineering,China University of Mining&Technology-Beijing,Beijing 100083,China)

机构地区：[1]中国矿业大学(北京)应急管理与安全工程学院,北京100083

出　　处：《矿业科学学报》2020年第3期272-277,共6页Journal of Mining Science and Technology

基　　金：国家重点研发计划(2018YFC0808100)。

摘　　要：采空区遗煤属于二次氧化煤,遗煤自燃严重威胁着煤矿安全生产。氮气可作为灭火剂对遗煤自燃进行抑制。为研究氮气对二次氧化煤的影响,本文采用了热重分析和程序升温系统分别对升温过程和灭火过程进行了实验与分析。在升温过程中,随着氮气浓度的增加,特征温度均有所上升,氮气对二次氧化煤的燃烧具有抑制作用。在降温灭火过程中,以温度和指标气体CO浓度作为监测参数,对其灭火效果进行实验。分析发现,在程序升温到400℃的二次氧化煤中通入氮气与空气的混合气体,当氮气与空气的体积比为50%/50%时,较自然降温的时间节约了38.0%,CO浓度降至0所需的时间减少了42.1%。氮气浓度越高,二次氧化煤的灭火时间越快,生成的产物越少,灭火效果越好。The spontaneous combustion of coal in the goaf,which belongs to secondary oxidation coal seriously threatens the safe production of coal mines.Nitrogen can be used as a fire extinguishing agent to inhibit spontaneous combustion of residual coal.In order to study the effect of nitrogen on secondary oxidation coal,thermogravimetric analysis and temperature programmed system are used to carry out experiments on and analysis of heating process and extinguishing process.During the heating process,as the concentration of nitrogen increased,the characteristic temperatures increased,and nitrogen inhibited the combustion of secondary oxidation coal.In the process of cooling and extinguishing fire,the temperature and indicator gas CO concentration were used as monitoring parameters to test the fire extinguishing effect.The analysis shows that when a mixture of nitrogen and air with the ratio of 50%/50%,was introduced into the secondary oxidation coal programmed to 400 ℃,the time was reduced by 38.0% compared with the natural temperature drop,also the time for CO concentration to drop to 0 was shortened by 42.1%.The higher the nitrogen concentration,the shorter the fire-extinguishing time of the secondary oxidation coal,and the less the product produced,the better the fire-extinguishing effect.

关 键 词：二次氧化煤 自燃 氮气 灭火 

分 类 号：TD75[矿业工程—矿井通风与安全]