编辑同志:《煤矿安全规程》规定了“在掘进工作面的进风流中,按体积计算,氧气不得低于20%……”。随着通风调压技术的应用和矿井通风中的一些特殊情况,出现了《规程》规定以外的情况,请给予指导。一、在调压灭火、调压控制有害气体泄出的情况下,出现了长距离的“无风”独头盲巷。然而,无风区内 CH_4浓度不超过0.5%;CO_2浓度不超过0.5%;温度低于26℃;O_2不 Edit comrades: “Coal Mine Safety Regulations” provides that “in the face of the intake airflow, according to the volume, the oxygen shall not be less than 20% ... ...”. With the application of ventilation and pressure control technology and mine ventilation in some special circumstances, there have been “rules” provisions other than the situation, please give guidance. First, in the case of pressure regulating and extinguishing, voltage regulation and control of harmful gases leaked, there has been a long distance “windless” blindfold. However, the concentration of CH_4 in the no-wind zone does not exceed 0.5%, the CO_2 concentration does not exceed 0.5%, the temperature is lower than 26 ℃, O_2 is not