China Coal Shaanxi Yulin Energy & Chemical Co., Ltd. has obtained 2 national utility model patents authorization. “Coal Bunker Position Automatic Control System” uses coal position sensor, PLC controller, sets up the corresponding logical relationship, controls coal bunker position and warehouse bottom coal feeder mutual linkage, realizes the automatic control of coal bunker position, effectively improves the level of intelligent operation of mine coal bunker. “Wet Dust Discharge and Dust Suppression Device” is provided with a dust cover for collecting fly ash at the exit of the ash falling pipe to effectively suppress the dust discharge problem.