Mine ventilation facilities and mine ventilation pipes

In order to make the flow distribution of underground airflow along the specified route, it is necessary to build a structure to guide and control airflow in some tunnels, namely ventilation facilities, which can be divided into the facilities to guide airflow and cut off airflow.

A facility for channeling wind currents

Large gully coal mine wind cave

Large gully coal mine wind cave

1, the wind tunnel: the wind tunnel is a section of the roadway connecting the fan device and the air shaft. The wind tunnel uses concrete, masonry, and other building materials to build a circular rectangular roadway, which is determined by the characteristics of the air duct.

2. Wind bridge: Wind bridge is a ventilation facility that separates the new and dirty air of two planes into the new and dirty air of a three-dimensional intersection.

According to different structural characteristics, wind Bridges can be divided into three types:

(1) Bypass-type wind bridge. (2) Concrete wind bridge. (3) Iron cylinder wind bridge

3. Wind window (card)

The wind window is set on the wall or door in the roadway, and an adjustable space window is left on the wall or door, so as to achieve the purpose of adjusting the air volume by adjusting the area of the space window.

4. Wind barrier:

In the roadway, wood boards, reed MATS, and air duct cloth are used as cloth barriers to guide wind flow. This method is commonly used to deal with the accumulation of gas in high-risk places and falling corners.

5. Air duct:

In the roadway, positive pressure or negative pressure ventilation power is used to send the specified air volume to the destination through the pipeline, which is called the air duct.

Airflow isolation facility

1. Explosion-proof door (cap)

The explosion-proof door is installed in the fan cylinder to prevent the shock wave from destroying the fan when coal dust and gas explosion occurs underground. When underground coal dust, gas explosion, explosion door can be opened by the air wave, the explosion wave directly into the atmosphere, so as to play the role of fan protection.

2. Wind retaining wall

In the tunnels that do not allow airflow through and do not allow pedestrians, such as mined-out areas, old lanes, and fire areas, as well as the contact between the inlet and return air lanes, the wind retaining wall must be set to cut off the airflow. In order to avoid causing air leakage, air short-circuit formation of the ventilation system to lose reasonable stability and accidents.

The wind retaining wall is divided into temporary wind retaining walls and permanent wind retaining walls.

1) Temporary wind retaining wall: generally, wood boards are nailed on the column, and yellow mud is smeared on the wood to build a temporary wind retaining wall.

Service conditions: service life is not long, roadway surrounding rock pressure is small, and air leakage rate is not a strict requirement for use.

2) permanent wind retaining wall: generally use material stone, brick earth, cement, and concrete building.

Service conditions: long service life, roadway surrounding rock pressure, air leakage rate strict requirements for use.

3. Damper:

Air gates must be set up in the roadway where airflow is not allowed to pass, but pedestrians or driving are required.

According to the structure: ordinary damper and self-operated damper.

4, ventilation facilities management regulations:

(1) The ventilation department should adjust the system to minimize the natural distribution of air volume.

(2) Take good care of ventilation facilities: it is strictly prohibited to open the air door at the same time or hit the air door with a car. The damage to the air door should be reported to the ventilation schedule in time. If the air volume of the system is affected by the power failure in the affected area and the production after the evacuation and repair, the safety supervision scheduling organization should analyze and deal with it.

(3) Ventilation facilities are managed by the ventilation department, and other units have no right to move or remove, such as the need to remove or move need to contact the ventilation department in advance.

(4) It is strictly prohibited to step into the railing, remove the railing, and close the wall, wind card, and other ventilation facilities.

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