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为研究煤矿采空区含瓦斯和不同氧氮比气氛对浮煤自燃的影响,建立了煤低温氧化实验系统,设计了不同氧氮比和甲烷体积分数的18组实验气氛方案,并在此气氛下对自燃煤层煤样开展程序升温氧化实验。研究表明,高氧氮比气氛下煤样CO初始产出温度比低氧氮比气氛低,同时高甲烷组分抑制CO生成;C_2H_4产出随甲烷体积分数增加而降低,随氧氮比减小而降低,氧化气氛中甲烷对C_2H_4产出有一定的抑制效应;在拐点温度后,高氧氮比、低甲烷组分下CO_2产出速率高于低氧氮比、高甲烷组分;C_2H_6产出到160℃时达到峰值,随后产出量缓慢下降。
In order to study the influence of gas and different oxygen to nitrogen ratio on coal spontaneous combustion in coal mined area, an experimental system for low temperature oxidation of coal was established and 18 experimental atmosphere schemes with different oxygen and nitrogen ratios and methane volume fractions were designed. In this atmosphere, Under the spontaneous combustion of coal samples to carry out the process of temperature oxidation experiment. The results show that the CO initial output temperature of coal sample is lower than that of low oxygen and nitrogen atmosphere under high oxygen and nitrogen ratio, while high methane component inhibits CO formation. The output of C 2 H 4 decreases with the increase of methane volume fraction, But the methane production in the oxidation atmosphere has a certain inhibitory effect on the output of C 2 H 4. After the inflection point temperature, the CO 2 production rate of the high-oxygen-nitrogen ratio and low-methane components is higher than that of the low-oxygen-nitrogen ratio and high methane components; Peaked at 160 ° C and then slowly declined.