摘要
针对矿井回采期间采煤工作面所涌出的一氧化碳气体影响工作面正常生产的难题,在3个矿井采集煤样,对一氧化碳气体的来源进行分析。分别在2种不同气体环境下进行煤样破碎试验,分析煤样温度和一氧化碳气体变化规律。借助恒温加热试验,分析煤样在温度和试验环境不同条件下2种气体浓度的变化情况。试验结果表明,煤样在氮气条件下破碎时形成一氧化碳气体浓度比3.0×10^(-5)小,产生气体的原因是机械方式粉碎煤体,激活脱羰;煤体处于空气条件下破碎过程形成的一氧化碳气体浓度比6.0×10^(-3)小,一氧化碳气体来自于煤氧复合反应;煤样在空气和氮气条件下的升温速率分别是1.0℃/s和0.6℃/s。在氮气环境下3种煤样未生成一氧化碳气体,但是煤样自身存在的一部分吸附态甲烷气体,由于高温作用解析出来,说明煤体内不存在吸附态一氧化碳气体。当煤体温度超过80℃时,煤样的氧化反应加剧,一氧化碳浓度呈现指数关系的升高。
In view of the problem that the carbon monoxide gas emitted from the coal mining face during the mining period affects the normal production of the working face,coal samples were collected in three mines to analyze the source of carbon monoxide gas.The coal sample crushing test was carried out under two different gas environments,and the variation law of coal sample temperature and carbon monoxide gas was analyzed.With the help of constant temperature heating test,the changes of two kinds of gas concentration in coal samples under different conditions of temperature and test environment were analyzed.The results show that the concentration of carbon monoxide gas is smaller than 3.0×10^(-5) when the coal sample is crushed under nitrogen condition.The reason for the gas generation is that the coal is crushed mechanically and the decarbonylation is activated.The concentration of carbon monoxide gas formed in the crushing process of coal under air conditions is smaller than 6.0×10^(-3),and the carbon monoxide gas comes from the coal-oxygen composite reaction.The heating rates of coal samples under air and nitrogen conditions are 1.0℃/s and 0.6℃/s,respectively.In the nitrogen environment,the three coal samples did not produce carbon monoxide gas,but a part of the adsorbed methane gas in the coal sample itself was resolved due to the high temperature effect,indicating that there was no adsorbed carbon monoxide gas in the coal body.When the temperature of coal body exceeds 80℃,the oxidation reaction of coal sample is intensified,and the concentration of carbon monoxide increases exponentially.
作者
马文秀
Ma Wenxiu(Jinneng Holding Coal Group Silaogou Mine,Datong 037000,China)
出处
《煤炭与化工》
CAS
2024年第9期113-117,共5页
Coal and Chemical Industry
基金
国家自然科学基金项目(50304009)。
关键词
煤样复合反应
一氧化碳气体
煤体破碎
恒温加热
coal sample composite reaction
carbon monoxide gas
coal crushing
constant temperature heating
