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后退式回采、折返式通风系统工作面中,风压高低不同,直接影响采空区空气流动,从而有可能助长或抑制采空区中遗留煤炭自燃,也可能将采空区瓦斯诱到上三角、工作面及其回风顺槽中超过允许浓度。因此近些年来,许多矿井采用均压通风,保证工作面安全回采,取得较好效果。均压通风是采取某些措施升高或降低工作面及其采空区的空气压力,从而改变采空区漏风状态(控制漏风方向和漏风量),达到抑制采空区中遗留煤炭自燃和防止瓦斯在生产巷道(包括工作面)聚集的目的。这些措施是利用并联风道、安设风窗或风机,这三项措施可以单独使用,也可以联合使用。
Backward mining, return ventilation system face, the different levels of air pressure, a direct impact on the air flow in the goaf, which may contribute to the suppression or suppression of spontaneous combustion of coal in the goaf, may also be induced by the gas gob the upper triangle , The face and the return air inlet groove exceeds the allowable concentration. Therefore, in recent years, many mines use pressure equalization and ventilation to ensure safe mining face and achieve better results. Pressure equalization ventilation is to take certain measures to increase or decrease the air pressure in the face and its goaf, so as to change the state of air leakage in the goaf (control the direction of air leakage and the amount of air leakage) to suppress spontaneous combustion of coal left over in the goaf Gas in the production of roadway (including the face) the purpose of gathering. These measures are the use of parallel duct, the installation of wind windows or fans, these three measures can be used alone, can also be combined.