This article mainly analyses and solves several key problems which are easily neglected or misunderstood in measuring and countinggas and it is of great significance in practice.
分析和总结了在瓦斯测量与计算中容易忽视或误解的几个问题，对瓦斯的测量和计算具有现实的指导意义。
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The method for recognizing gas zone with PND logging data is introduced, which is to overlap the counting rates of a near detector and a far one to recognize gas zone based on certain scale.
Engineering design issues of the cleaning system such as gas collecting equipment, cleaning principle, technical process and counting of dust air flux were briefly explained.