I would imagine you could have a lot of impurities mixed in the methane which is piped off from coal mines which would need to be removed for it to be considered usable in homes. It is air from a mine, so it really could have any number of varying impurities. You probably also have a little carbon monoxide from operating equipment and blasting in there as well, since carbon monoxide is lighter than oxygen and carbon dioxide. Maybe even coal dust depending on how they extract it..
Refined natural gas from gas wells, used in most people homes and businesses, is generally purified methane. Through the refining process, they remove most of the contaminants and the end product is pretty much pure methane. Pure CH4...
Depending on your gas wells, natural gas in it's unrefined form contains 70 - 90% methane. You generally run into varying amounts other impurities such as ethane, propane, butane, carbon dioxide, oxygen, nitrogen, hydrogen sulfide and other gases.
Miner Greg
|