The general mine reversal of airflow remains one of the few methods for rescuing underground personnel in the event of a fire in the main air-supplying coal mine workings. However, this ventilation maneuver is not safe. It is known that reversals in fire conditions at high-methane-containing enterprises caused explosions of air-methane mixtures. The main cause was additional methane emitted from the excavated space into the operating workings. The nature of this phenomenon has been understudied.
The study aims to assess additional methane emissions in low-dip mines with forced ventilation resulting from the transition to suction ventilation and its impact on aerologic safety.
An original approach has been proposed to identify regularities in the formation of additional methane emissions from excavated spaces triggered by changes in ventilation methods, and to determine the dependence of its main parameters on the conditions of a facility where ventilation is modified.
As a result of studies, it has been established that during the transition from forced ventilation of a high-methane-containing mine to the suction ventilation, an additional methane flow from excavated space to operating workings depends on several factors, including mine performance, its service life, depression of the main ventilation fan, locations of excavated areas in relation to the main ventilation fan and the state of their insulation, permeability of broken-down rocks, and the distribution of methane concentration in the excavated space. In particular, it has been observed that the most intense methane flow from the excavated space is supplied by the recently extracted areas, located next to the main ventilation fan.
The obtained results significantly expand the concept of transient aerodynamic processes initiated by deep changes in mine ventilation regimes and help forecast gas conditions in mine workings after such modifications.
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