Research on application of downward ventilation to coal mining face in horizontal seam with coal outburst in potential;

Field experiments using downward ventilation were studied and the gas emission and distribution laws at the goaf working face were discussed.

This paper discussed methane emission,the reasons for methane reduction in up corner,problems should be considered in the condition of change from normal ventilation into downriver ventilation.

In order to find more effective control measurements for declensional ventilation mine fire,the catastrophe potential function of airflow reversal in a declensional ventilated mine fire was deduced by using catastrophe theory,which indicates the airflow reversing process has discontinuous characteristics.

Delivery of catalyst particles by a screw feeder at the inlet of a downer in a hot model was studied, and the effects of pressure difference, downward wind, temperature on feeding rate were investigated.

The authors elaborate the application of longwall mining with descentional ventilation at 7327 working face in the medium-thickness seam with big dip-angle,and point out the ways of fire prevention by giving even air pressure,burying pipe and gelatinizing,and using atomizing inhibitor.