Abstract: In order to avoid influence caused by hydrogen sulfide emission on production safety during mining process of fully-mechanized excavation faces, a new technical plan with wind-curtain ventilator to seal these faces was put forward based on site measurement and analysis of hydrogen sulfide distribution law of No.8116 fully-mechanized excavation face in Jinniu Mine, aiming at preventing its overflow. Secondly, a mathematical model of wind-curtain dust-catching ventilator in confined space was established according to potential superposition principle and fluid mechanics theory. Finally, an air curtain jet velocity attenuation experiment was conducted to verify its rationality. The results show that wind curtain velocity will attenuate abruptly in early stage and then slowly later as jet distance grows, and theoretical wind velocity calculated through this model is basically consistent with measured one. In space sections where air curtain jet needs to be sealed, measured wind speed is all above 2.7 m/s, which helps prevent hydrogen sulfide from leaking. Through field installation and application, concentration of hydrogen sulfide at driver's position can be reduced from 72.5×10^-6 to 6.3×10^-6, thus achieving good control effect of hydrogen sulfide.

Key words: fully-mechanized excavation face, wind-curtain ventilator, mine hydrogen sulfide, circular jet, parallel plane flow