SIMULATION OF CONVECTIVE MOVEMENT OF METHANE IN DEAD-END PRODUCTION WITH SUCTION VENTILATION METHOD

Abstract

The analysis of the disadvantages and advantages of the suction method of ventilation of dead-end workings in comparison with the supply of air through the pipeline by injection is carried out. It is noted that when using the first method of ventilation, difficulties arise with regard to the removal of methane from the bottom-hole part of the working area, associated with the occurrence of convective thrust that lifts light gas up under the roof and pushes it against the movement of air in the direction of the mouth of the mine. An analytical model of the convective movement of methane in an inclined dead-end mine has been developed, on the basis of which a quantitative assessment of the minimum air supply rate for face ventilation has been made, in which all the released methane is removed by suction into the pipeline, without its part accumulating under the roof of the mine with a gradual spread of the methane-air mixture towards the mouth. Verification of the analytical results obtained by numerical simulation of changes in methane concentration along the length of the mine depending on the air velocity and the slope of the mine was carried out...