从探火孔出来的煤气着，煤气质量变差。
Come out from the gas exploration with fire hole, gas quality becomes poor.
中心点火管传火孔射流场直接影响火炮膛内的点火传火过程。
The jet flows from vent holes in a center-core igniter strongly influence the process of ignition in guns.
介绍了外火箱矩形竖窑进火孔改造前的使用情况以及改造的必要性；
This article introduces the application of fire entry hole of rectangle kiln with outer fire box before reconstructing and the necessity of reconstruction.
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