How is gas concentration controlled in coal mine gas drainage?
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It seems that air dilution can be used to reduce gas concentration, but what if one wants to increase the gas concentration for utilization? Is the concentration of gas extracted controllable?
I’m not too familiar with it, but the gas from coal mines should be extracted immediately, right? If we want to increase its concentration, wouldn’t that make it easier to separate the gas? Looking forward to the expert's reply.
I don’t know either, but the answer given on the 2nd floor is wrong. Now, gas with a concentration of over 30% can be utilized, but gas with a concentration below 30% has little utility. Because when the concentration is below 30%, the oxygen content inside is too high, which is dangerous and results in poor economic efficiency.