深井酸性浸水煤层风干氧化自然发火特性分析

Spontaneous combustion characteristics of air dryingoxidation in deep mine acid immersed coal seams

为探究深井酸性浸水煤层风干氧化自然发火的特性,选取陕西省某矿煤样,利用氧化模拟试验系统,对预氧化及浸水风干煤样和原煤样进行程序升温试验,对比分析了两者的耗氧量以及CO、CO 2、CH 4的产生量,进而分析这几种不同情况下煤样的氧化自燃特性。结果表明,酸性条件下浸水风干的煤样耗氧量最小,说明该煤样在氧浓度低时容易发生氧化自燃;酸性条件下浸水风干的煤样CO、CO 2、CH 4的产生量最大,说明该煤样发生氧化自燃的危险性越大。总之,当煤体处于高地温、弱酸性浸水风干条件下发生煤体氧化自燃的危险性最大,研究结论可为矿井高产高效和安全生产提供一定的指导。

In order to investigate the characteristics of spontaneous combustion during air drying oxidation of deep mine acid immersed coal seams,a coal sample from a certain mine in Shaanxi Province was selected to conduct programmed temperature-rising experiment using an oxidation simulation experimental system.The oxygen consumption and the production of CO,CO 2,and CH 4 of pre oxidized and immersed air drying coal samples and raw coal samples were compared and analyzed,and the characteristics of spontaneous combustion of coal samples under these different conditions were analyzed.The results show that the oxygen consumption of the coal sample immersed in water and dried by air is the smallest under acidic conditions,which indicates that the coal sample is prone to oxidative spontaneous combustion when the oxygen concentration is low.The production of CO,CO 2 and CH 4 in coal samples immersed in water and air dried under acidic conditions is the largest,which indicates that this coal sample is at high risk of oxidative spontaneous combustion.In short,when the coal body is in the condition of high temperature and weakly acidic immersing and air drying,the risk of coal oxidative spontaneous combustion is the greatest.The research is of guidance for high yield,high efficiency and safe production of mine.