The main functions of nitrogen injection in coal mines are as follows.
Prevent Spontaneous Combustion of Coal
During the processes of coal mining, transportation and accumulation, it is prone to contact with oxygen in the air, undergoing slow oxidation reactions, with the temperature gradually rising, and eventually may cause spontaneous combustion fires. After nitrogen injection, the oxygen concentration can be significantly reduced, making oxidation reactions difficult to proceed, thereby lowering the risk of spontaneous combustion and prolonging the safe exposure time of coal. Therefore, PSA nitrogen generators are particularly suitable for goaf areas, old goaf areas, and confined areas.
Suppress the Risk of Gas Explosion
Methane gas is often present in underground coal mines. When the concentration of methane in the air is between 5% and 16% and there is a source of fire or a high-temperature point, an explosion is highly likely to occur. Nitrogen injection can serve two purposes: diluting the concentration of oxygen and methane in the air, reducing the risk of explosion, and acting as an inert gas fire extinguishing medium in the event of a fire to suppress the spread of the fire.
Maintain an Inert Atmosphere in the Confined Area
Some areas in coal mines need to be sealed off (such as old alleys and mined-out areas), but there are still hidden dangers of incomplete fire suppression or gas accumulation within these areas. By continuously injecting nitrogen, an inert environment of low oxygen and no fire sources in this area can be maintained, and secondary disasters such as re-ignition or gas outburst can be avoided.
Cost-Saving & Flexible Operation
Compared with other fire extinguishing methods (such as water injection and filling), nitrogen injection has the following advantages:
- It does not damage the structure of the coal.
- It does not increase the humidity of the mine.
- It can be operated remotely, continuously and controllably
In conclusion, nitrogen injection into coal mines is a safe, environmentally friendly and efficient preventive measure used to control oxygen concentration, prevent spontaneous combustion and suppress gas explosions, thereby ensuring the safety of miners’ lives and mine property.
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Post time: Jul-10-2025