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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 on the explosion limit of methane, a pulse ignition method was adopted in the experiment. After the single pulse energy was calibrated, the minimum ignition energy at methane concentration 8.9% was 0.28 mJ. On this basis, ignition The size can be followed by 0.7,2.2,3.7,5.2,9.6,26,106,241 mJ. Experimental results show that with the increase of ignition energy, the lower limit of methane explosion upper limit will decrease. At the ignition energy of 0.7-26 mJ, the upper (lower) limit of methane explosion increases (decreases) obviously with the ignition energy of 106-241 mJ and the methane Upper (lower) limit Explosion (decline) The trend tends to ease. Comparing the upper and lower limits shows that the influence of ignition energy on the upper limit of methane explosion is greater than the lower limit of explosion.