甲烷浓度对甲烷燃烧爆炸特性影响的实验研究

Experiment Study on Methane Concentration Affected to Combustion and Explosion Features of Methane

甲烷—空气混合物在强点火系统中爆轰的点火和增长过程是一系列复杂过程的组合，包括相变、混和、化学反应、颗粒的闪燃等。文章利用水平多相燃烧爆炸管道等系统，对甲烷空气的混和物在液雾强点火条件下的爆轰进行了研究。在浓度为2．5％、4．13％（小于5％的爆炸下限浓度）及强点火的条件下，燃烧爆炸波能在甲烷空气混合物中传播；在浓度为15．15％（大于15％的爆炸上限浓度）及强点火的条件下，燃烧爆炸波也能在甲烷空气混合物中传播。对于极限浓度内的甲烷，爆炸的最优浓度在9．13％～10．92％，这与甲烷理论上的最优浓度10％左右非常接近，根据后面的不同浓度甲烷爆压的理论与实验结果对比图也可以证明这一点。

A detonation initiation and the increasing process of the methane - air mixer in the strong initiation system is a combination of the series complicated process, including the phase change, mixing, chemical reaction, particle flash burning and others. With the horizontal muhiphase combustion explosion pipeline and other system, a study was conducted on the detonation of the methane air mixture under a forced ignition of liquid spray. Under the concentration of 2. 5% , 4. 3% （5% lower than the lower limit concentration of the explosion） and the forced ignition, the combustion explosion wave energy would be spread in the methane air mixture. Under the concentration of 15. 15% （ 15% higher than the upper limit concentration） and the forced ignition, the combustion explosion wave could be spread in the methane air mixture. As for the methane within the extreme limit concentration, the optimal explosion concentration of the explosion would be 9. 13% - 10. 92% and would be high closed to the optimal concentration about 10% in the methane theory, which could approved by the comparison drawing between the later methane explosion theory and the experiment results.