脉冲点火方式下点火能对甲烷爆炸极限的影响

Influence of Ignition Energy on Methane Explosion Limit Under Pulse Ignition Way

为研究点火能对甲烷爆炸极限的影响规律,实验选用脉冲点火的方式,在校准了单个脉冲能量后使其满足在甲烷浓度8.9%时的最小点火能为0.28 mJ,在此基础上,选取点火能大小依次为0.7、2.2、3.7、5.2、9.6、26、106、241 mJ。实验结果表明,随着点火能量增加,甲烷爆炸上限会升高下限会降低,在点火能量0.7~26 mJ,甲烷爆炸上(下)限上升(下降)趋势明显,点火能量106~241 mJ,甲烷爆炸上(下)限上升(下降)趋势趋于缓和。比较上下限变化可知,点火能对甲烷爆炸上限的影响大于对爆炸下限的影响。

In order to study the influence of ignition energy on methane explosion limit, this experiment selects the pulse ignition way. A single pulse energy was calibrated to meet the minimum ignition of 0.28 mJ when the methane concentration was 8.9%.On this basis, the ignition energy can be selected as 0.7, 2.2, 3.7, 5.2, 9.6, 26, 106, 241 mJ. The experimental results show that the upper limit of methane explosion will increase and the lower limint will decrease with the increase of ignition energy. The increase（decrease） tendency of upper（lower） limit of methane explosion is obviously when the ignition energy is 0.7 mJ to 26 mJ.When the ignition energy is 106 mJ to 241 mJ, the increase（decrease） tendency of upper（lower） limit of methane explosion is gentle. Compared with the upper and lower limit, it can be seen that the influence of ignition energy on the upper limit of methane explosion is greater than that of the lower explosive limit.