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OpenStudy (anonymous):
the ignition of coal dust has caused many fatal mining explosions. Why
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OpenStudy (zpupster):
The following factors must be present to cause a dust explosion: (1) the presence of dust in suspension in a concentration above its flammable limit, (2) sufficient oxygen to enable combustion of the fuel, (3) a source of energy to ignite the fuel, and (4) a certain degree of confinement of the suspended dust mixed with oxygen. abstract on Coal Dust Explosions in the Cement Industry--same principal as coalmines http://www.msha.gov/S%26HINFO/TECHRPT/FANDE/CDUSTEX.pdf
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