Mine ventilation method refers to the working method of the main ventilator supplying air to the mine. According to the installation position of the main fan, it can be divided into three types: drawing type, pressing type, and mixed type.

Pull out ventilation

Extraction ventilation is a mine ventilation method in which the main fan of the mine is installed on the ground at one side of the air outlet shaft, and the fresh air flows through the air inlet shaft to the underground air location, and the dirty air is discharged to the surface through the fan.

The characteristics of pull-out ventilation are:

1. Under the action of the main fan in the mine, the air in the mine is in a state of negative pressure below the local atmospheric pressure. When there is an air leakage channel between the mine and the ground, the air leakage leaks into the well from the ground.

2. The draw-out ventilation mine does not need to install the damper in the main air inlet lane, which is convenient for transportation, pedestrians, and ventilation management.

3. Exhaust ventilation is adopted in the gas mine. If the main fan stops running for some reason, the airflow pressure in the underground will increase, and the gas can be prevented from the gusher from the goaf in a short time, which is relatively safe.

Press-in ventilation

Press-in ventilation is a mine ventilation method in which the main fan of the mine is installed on the ground at one side of the air inlet shaft, and the fresh air is sent to the underground air location after the pressure of the main fan, and the dirty air is discharged to the surface through the return air shaft.

The characteristics of press-in ventilation are:

1. Under the action of the main ventilator in the mine, the air in the mine is in a positive pressure state higher than the local atmospheric pressure. When there is an air leakage channel between the mine and the ground, the air leakage leaks from the well to the ground.

2. In the pressure ventilation mine, due to the installation of the damper in the main air inlet lane of the mine, the transportation and pedestrians are inconvenient, the air leakage is large, and the ventilation management is difficult.

3. When the main fan of the mine stops running for some reason, the airflow pressure in the mine is reduced, which may increase the amount of gas emission in the goaf, resulting in gas accumulation, which is adverse to safety.

Mixed type ventilation

Mixed ventilation is a mine ventilation method in which the main mine ventilator is installed on one side of the inlet and return air shaft, the fresh air is sent into the mine by the pressure-type main ventilator, and the dirty air is discharged out of the mine by the extraction type main ventilator.

The characteristics of mixed ventilation are:

1. A press-in ventilator is installed near the ground of the air inlet wellhead, and a withdrawal ventilator is installed near the ground of the air outlet wellhead.

2. Compared with surface air pressure, downhole air pressure is positive on one side of the inlet air system and negative on the other side of the return air system.

Advantages: adapt to larger ventilation resistance and small air leakage inside the mine. Disadvantages: Ventilation equipment, power consumption, complex management. It is rarely used.

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