Study on the placing method of methane sensors in driving face

It theoretically analyses the distribution rule of methane concentration in the driving face in the case of ventilation and no ventilation, offers theoretical basis for the sensors placement. It resorts to the gray-system method to predict methane concentration at the place of sensor,combines the unary linear regression equation,calculates the objective monitor zone's top concentration value range based on methane concentration. According to the monitor zone's top concentration value range, we confirm sensors placement, alarm concentration and power failure concentration in order to ascertain methane safety at the place of monitor scope.