What are the difficulties in ventilation of long distance single head roadways and how to overcome t

The distance is deep, the ventilation cannot reach the bottom, and the ventilation duct needs to be erected separately.

Large wind resistance Auxiliary hair dryers are now commonly used.

The solution to the difficulty of long-distance ventilation in the coal roadway excavation in the high-outburst mine: 1. Replace the high-power local fan to increase the air supply; 2. Adopt large-diameter hair dryer to reduce the turning of the hair dryer and reduce the ventilation resistance of the hair dryer; 3. Strengthen the hanging, connection and repair of the hair dryer to reduce the air leakage of the hair dryer. In addition, when designing the roadway, the tunneling length and air supply distance should be considered as much as possible, and there is no other good way.

There is no good way.

Only local ventilators can be used, there are two forms: press-in type and extraction type, the "Coal Mine Safety Regulations" seems to stipulate that high-gas mines and gas outburst mines can only use press-in type, and the excavation face with large mine dust should also use press-in type, and other cases can be used extraction type. It can also be mixed.

The distance from the mouth of the duct to the excavation face is also stipulated, which can be found in the "Coal Mine Safety Regulations".

Hope it works for you.

Single-head roadway: In the construction of the mine, there is only one exit of the underground tunneling roadway.

The single-head roadway is the main gathering place of toxic gases and dust in the mine, and is the main object of mine ventilation.

The cul de sac is a small circle in the residential area, with only one access point. See figure.

cul de sac

Basic translation. single-headed roadway; Dead end; The end of the road.

Web paraphrasing. cul de sac: one-headed roadway|Genesis Chorus |Cul-de-sac at the bottom of the alley: The end of the road|Dead end; cul-de-sac structure: disconnected structure is derived from the French word fora.

The roadway is generally excavated underground, and the roadway that is not opened is a single-headed roadway.

If it is opened, you can shoot from one end of the roadway to the other, and you can pass through, and it is not a one-headed roadway.

Not less than 200 meters, i.e. greater than or equal to 200 meters.

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