The coal seams mined in the Sandaogou Coal Mine are characterized by shallow burial depth, high susceptibility to spontaneous combustion, and near-horizontal occurrence. Surface air leakage not only leads to abnormal gas emissions from the goaf but also results in frequent low-oxygen conditions at the working face. Meanwhile, it increases the oxygen concentration in the composite goaf, thereby elevating the risk of spontaneous combustion of residual coal.To address the above issues, a comprehensive intelligent ventilation regulation system was established. Based on the on-site meteorological conditions, gas emission rates, and the number of personnel, the required airflow for the working face was calculated, resulting in a demand of 1122.66 m3/min.The ventilation route was determined, and an equal-pressure system—comprising fans, air doors, sensors, and other components—was designed. Based on ventilation resistance calculations and the functional relationships among fan frequency, rotational speed, air pressure, and airflow, the FBD-№12.5 2 × 75 kW variable-frequency equal-pressure fan was selected. An intelligent remote control system for air doors and an intelligent monitoring system for local fans were developed, integrating multiple types of sensors—including differential pressure, multi-parameter, photoelectric, and proximity sensors—to enable automated control and coordinated operation of air doors, air windows, and fans. An intelligent monitoring software platform consisting of seven functional modules was established, achieving real-time monitoring and dynamic balancing of working-face air pressure, airflow, and goaf differential pressure. This system significantly enhances the level of intelligent safety management in coal mine operations.
Wang et al. (Sun,) studied this question.