If the flammable gas supply cannot be shut off, the continued escape of unburned gas can create an explosive mixture in the air.

如果易燃气体供应无法切断，不断逸出的未燃气体会在空气中形成爆炸性混合物。

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When sucked up by a whirl of air, this unburned gas travels up the core until it reaches a region where there is enough fresh, heated oxygen to set it ablaze.

当这些未能燃烧的气体被气漩涡吸起，一直移动到核心处拥有足够氧气的区域，受热的氧气就会让这些气体燃烧起来。

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The results illustrate that primary air ratio has a major effect on pulverized coal ignition and minor effects on gas temperature, oxygen concentration and unburned carbon at furnace exit.

结果表明：一次风率对煤粉气流的着火影响较大，而对出口处烟气温度、氧量以及飞灰含碳量影响较小。

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