Simulation Research on Active Asynchronous Reverse Ventilation Strategy of Multiple Air Shafts during Fire

In order to more accurately describe the change process of air flow and gas in the ventilation network system during the period of mine reverse ventilation, the asynchronous reverse wind problem of multiple wind Wells in the mine was studied by using TF1M3D simulation. The FDt(k) of all the air Wells is combined into a numerical code DF according to a certain algorithm to judge the working state of the fan of multiple air Wells,three possible working states of the ventilator, including shutdown, non-operation, single-machine operation and dual-machine operation, are defined, and corresponding codes representing these three states are given as the basis for judging whether the working state of the ventilator in TF1M3D is updated.Three possible working states of the ventilator, including shutdown, non-operation, single-machine operation and dual-machine operation, are defined, and corresponding codes representing these three states are given as the basis for judging whether the working state of the ventilator in TF1M3D is updated. Combined with the field example of the eighth mine in Hebi mining area, the simulation analysis is carried out by using TF1M3D simulation software. The reverse ventilation starts, the fan stops, and in a short pause, the mine relies on natural wind pressure ventilation, the airflow velocity is low, the air volume is small, and the gas accumulation occurs for a short time. Then, with the change of ventilation direction of the fan, the air flow changes accordingly. TF1M3D gives the corresponding changes of ventilation and working conditions. At the same time, the gas migration state changes, and the gas peak overlimit phenomenon appears on the working face. With the advance of the reverse ventilation work, the concentration of migrating gas showed a gradual decrease. The simulation of asynchronous reverse ventilation in multiple air shafts of mine accurately describes the corresponding changes of gas components in the mine system when the wind is stopped in the reverse ventilation operation, and improves the calculation accuracy of ventilation simulation during the disaster period.