Type of Document Master's Thesis Author Lin, Wei URN etd-4759949751281 Title The Ignition of Methane and Coal Dust by Air Compression - The Experimental Proof Degree Master of Science Department Mining and Minerals Engineering Advisory Committee
Advisor Name Title Karfakis, Mario G. Karmis, Michael E. McPherson, Malcolm J. Committee Chair Keywords
- methane
- dust
- compression
- explosion
- experiments
Date of Defense 1997-05-01 Availability unrestricted Abstract When a large area of open gob collapses
suddenly, a windblast is produced that can
cause considerable damage throughout the
infrastructure of a mine. In a few cases, the
windblast has been accompanied by ignitions
of methane and/or coal dust. Analytical and
numerical analyses investigated the transient
behavior of the air through the small time
period during which the roof is falling. This is
sufficiently short to allow adiabatic
compression of the air, i.e. negligible heat
transfer to rock surfaces. Controlled escape of
the air via interconnecting entries limits the
build-up of air pressure. However, this same
phenomenum causes the potential energy of
the falling strata to be concentrated into a
diminishing mass of air. Computer simulations
predicted that the temperature of the air would
increase rapidly as the roof descends, reaching
values that are capable of igniting either
methane or coal dust.
This thesis concentrates on a series of
laboratory tests involving the compression of
mixtures of air, methane and coal dust under a
falling weight and while allowing controlled
escape of the mixture. The transient responses
on pressure and temperature sensors were
recorded. In addition to an analysis of those
records, the thesis highlights those conditions
in which ignitions occurred.
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