Methane Gas: The Easy Exploded
Methane is a gas that is lighter than air, colorless, odorless, and non-toxic.
Methane is present in all coal seams, coal is formed simultaneously with the formation
In underground coal mines, air containing 5-15% of at least 12.1% of methane and oxygen
will explode if exposed to sparks.
The amount of methane in a layer of very varied. Methane concentration will increase with
increases in coal quality and depth of reserves.
Methane contained in coal and compressed porous layer there. When the layer is mined,
methane that resides in the pores and then released.
A total of 70-80% methane content of the layer would not come from being mined. Most of
the methane comes from the surrounding layers (up / down, left / right) that has not been
This could occur because of differences in pressure between methane in coal pores (high
pressure) with air pressure tunnel (lower). High pressure gas will always seek lower air
In the early development of coal mining, air circulation is not enough, the failure detection
of the presence of methane, the use of fire, smoke, or use of explosives (black powder) is
not appropriate, a major cause of explosions in underground coal mines.
The most commonly used to reduce the rate of methane is to design a ventilation system
(ventilation) is good. Adequate air circulation is smooth and is expected to reduce levels of
It's just sometimes is not enough ventilation. There are times when an abundant amount of
air remains unable to reduce the rate of methane. If this happens, the reduction of methane
content should be done before the mine itself begins