Advanced control method and theoretical analysis on reversed airflow of mine main shaft in winter

According to the readily occurence of airfiow reversal in winter which wa difcuto prevent and control in main itake sharto coal mines in China. theeff c of atural wind pressure on arfovw staus in main shaft as analzed theoretcally n combination with the mine case,the causes of airiow reversal occurred in main shat in winer were discused by measuring and analzng the change of natural wind pressure betwee intake shafs,and the advance control method of this phenomenon was aso reseached. The results howed that with the decreasing of atnospheric environment temperature,the average temperatur diference between intakeshats with diferent heatsource distributon was increased gradual y.which resulted in the accumulation of natural wind pressure and further caused the airfiow reversain main shat in winter. The method of monitoring intake shafis'air temperature and wind speed in real time and regulating the volume of hot air for heating intake shafswas put forward. This metnod was easy and feasible and could decrease thearfovw temcerature diference between intake shafis and make the main sharis airiv stae changed in one hour. Using this method,the main shaft's airflow reversal could be prevented and controlled conveniently and effectively.