Mine Gases
- Constituents of different kinds of gases in atmosphere by weight or by volume:-
- Air is required in mines for four important reasons namely:-
- To supply oxygen for breathing.
- To remove heat from U/G environment.
- To dilute the presence of dust and various unwanted gases.
- To remove dust.
- When referring to noxious & poisonous gases met in the mines,the commonly used names are as follows:-
- BLACK DAMP:- It is the mechanical mixture of CO2 and excess N and extinctive gases. It is also known as Choke Damp or Stythe.
- FIRE DAMP:- It is a synonymous mixture of CH4 and air. It is referring to the mechanical mixture of gases chiefly inflammable given off naturally from the coal and consisting most part of CH4 .
- WHITE DAMP:- It is synonymous with CO.
- STINK DAMP:- It is sulphurated hydrogen(H2S).
- AFTER DAMP:- This is the mechanical mixture of gases existing in a mine after explosion of firedamp and coal dust. Its composition is extremely variable & usually include CO,CO2,N,N2S,SO2 with very small percentage of oxygen.
OXYGEN(O2)
NITROGEN(N2)
CARBON DI-OXIDE(CO2)
CARBON MONO-OXIDE(CO)
METHANE(CH4)
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