Coal gas purifier for safety protection system for drilling and spraying orifice

A coal gas purifier for a safety protection system for drilling and spraying orifice is characterized in that a dust collecting square box is arranged, the front side of the dust collecting square box adopts an openable slag removing door, an air inlet pipe and an air outlet pipe communicated with the dust collecting square box are arranged on two side walls of the dust collecting square box respectively, a baffle positioned in the front of an inlet flow channel is arranged in the dust collecting square box, and a sprayer is arranged and positioned above the inlet flow channel; and a filter screen is arranged at the airflow inlet of the air outlet pipe. In the underground construction, extracting and mining and drilling processes in coal mine, after massive methane gas and coal dust caused during the orifice spraying process are primarily shunted, the coal gas purifier is used for further purifying the methane gas mixed with a certain quantity of dust, so as to prevent the dust from entering a methane gas extracting and mining system with the methane gas together. The utility model has good use effect, can effectively prevent the coal dust from entering the methane gas extracting and mining pipeline, avoid the stoppage of the methane gas extracting and mining pipeline, ensures stable and reliable extracting and mining system and realizes high negative pressure connection extracting and mining operation.