摘要
对于开采低渗透难抽采煤层的高瓦斯矿井,因抽采浓度低而难以利用,现场有利用浮力富集乏风中瓦斯的设想,本文研究其可行性。现场试验表明,瓦斯浓度沿着高度方向差别很小,不存在实际意义上的富集。理论分析认为,离析态的瓦斯在浮力作用下可能产生积聚,但积聚不是瓦斯富集而是稀释;气体自发的扩散和通风,使风流中的瓦斯由离析态迅速转变为非离析态,非离析态瓦斯在重力场中的分离程度可以忽略不计。
Due to low suction concentration, it is difficult to utilize the methane in coal mine with low permeability and high methane concentration. An idea of methane accumulation by buoyant force was planned to be applied to the coal mine, so its feasibility was discussed in this paper. It was proved that the methane was difficult to enrich because of little difference in methane concentration in the vertical direction. Theoretically, segregated methane possibly accumulated by buoyant force, however, it was not methane enrichment but dilution. Owing to the diffusion and ventilation, the methane changed fast from isolation to non-isolation state, while the segregating degree of non-segregation methane was negligible in the gravity field.
出处
《中国煤炭》
北大核心
2012年第6期104-106,111,共4页
China Coal
关键词
瓦斯
乏风瓦斯
浮力富集
瓦斯富集
扩散
通风
离析态
非离析态
gas, gas of muddy wind, buoyant force enrichment, gas enrichment, diffusion, ventilation, segregation, non-segregation
