Study on integrated treatment technology of hydrogen sulfide extraction and purification in fully-mechanized mining face

During the driving of the fully mechanized driving face of the hydrogen sulfide coal roadway, due to the ventilation effect of the roadway, it is very easy to cause hydrogen sulfide gas accumulation and overrun in the front area of the driving face. In order to control the casualties and equipment damage caused by the accumulation and overrun of hydrogen sulfide gas in the fully mechanized mining face of coal mine, the research method of measuring the volume fraction of hydrogen sulfide gas with CD4 portable hydrogen sulfide instrument is used to test and analyze the distribution law of hydrogen sulfide gas emission and the change law of the volume fraction of hydrogen sulfide gas with time after the road-header stops cutting coal; It is revealed that the disturbance of coal cutting by the fully mechanized mining machine is the main cause of inducing the emission of hydrogen sulfide gas in the fully mechanized mining face, and the distribution law of the emission gradually decreases in the direction of the return air flow and the height of the roof and floor. By means of theoretical analysis, laboratory and field test, a new technical scheme for the integrated treatment of hydrogen sulfide extraction and purification in coal mine comprehensive mining face is proposed, the mechanism of the integrated treatment of hydrogen sulfide extraction and purification is studied, and the process technology and supporting device for the integrated treatment of hydrogen sulfide extraction and purification in coal mine comprehensive mining face are developed. The field application study shows that the volume fraction of hydrogen sulfide gas gushing at the position 1m after the suction tuyair and 1m after the outlet of the integrated treatment device of hydrogen sulfide extraction-purification on the excavation face decreases from 169.2×10⁻⁶ and 155.9×10⁻⁶ before extraction-purification to 13.9×10⁻⁶ and 10.2×10⁻⁶ after extraction-purification, respectively. The hydrogen sulfide extraction efficiency reached 91.8% and the hydrogen sulfide purification efficiency reached 93.5%, and the hydrogen sulfide hazard treatment effect is good, providing a new technical way for the treatment of the hydrogen sulfide hazard in the fully mechanized mining face.