Safety Operations and Assessment for Sealed Mine Atmosphere
A new concept, explosibility safety factor (SF), is introduced and defined to improve the safety for the rescue works. It can clearly show how dangerous the current atmospheric status is if the state point locates in any not-explosive zones and also provides a measurement method to measure the safety margin when dealing with the explosibility of a sealed mine atmosphere. A series of theoretical explosion risk assessment models to fully analyze the evolution of explosion risk in an underground mine atmosphere are proposed: (1) for an “not-explosive” atmosphere, judging the evolution of explosion risk and estimating the change-of-state time span from “not-explosive” to “explosive”; (2) for an “explosive” atmosphere, a set of mathematical equations are theoretically derived to estimate the inertisation time of a sealed mine atmosphere by using different inerting approaches and the “critical” time span of moving out of explosive zone and stating the best risk mitigation strategy are estimated.
KeywordsExplosibility diagram method Explosibility safety factor Mine rescue Inertisation time estimation Risk mitigations
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