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近年来,我们接到一些读者来信,提出了一些矿井回风流中低浓度瓦斯利用的设想,其中有一部分设想是建议利用气体分离的办法,分离矿井空气中的沼气,以得到高浓度瓦斯便于日常应用。矿井风流中沼气浓度不均匀的现象是客观存在的,并且在某些情况下,巷道风流中,上部比下部的沼气浓度要大些,这并不是因为沼气比空气比重小而产生的结果。但是在上述来信中,部分读者却认为,因沼气比重小,可以从空气——沼气混合气体中“浮”
In recent years, we have received some letters from readers and put forward some ideas for using low-concentration gas in the return air flow in mines. Some of them envisage the proposal of using gas separation to separate the methane in the air in the mine to get high-concentration gas for daily use application. The phenomenon of non-uniform methane concentration in mine ventilation is an objective phenomenon, and in some cases, the upper part of the draft of the roadway is larger than the lower part of the biogas concentration, not because of the small proportion of biogas to air. However, in the above letters, some readers think that because of the small proportion of biogas, they can “float” from the air-biogas mixture,