爆炸是由数袋甲烷气体着火引起的。
The blast was caused by pockets of methane gas that ignited.
通过分析计算，讨论了氢气对甲烷燃烧过程及着火温度、燃烧速率、燃尽时间的影响。
The effect of hydrogen on methane combustion and ignition temperature, burning rate and burnout time are discussed through analyzing the calculated results.
依据零值边界梯度着火理论，建立煤粉颗粒群与甲烷的混合着火模型。
A ignition model of pulverized coal particles cofiring with methane is given by applying the zero grads boundary layer theory.
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