Mining industry
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Goaf inerting
In Polish coal mining industry endogenous fires resulting from self-heating and spontaneous combustion of coal create the biggest fire hazard. To avoid this threat corrective actions are advisable to stop fires from breaking out. Inerting is one of them.
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Applications for nitrogen
Inerting mine atmosphere
Inerting involves replacing the mine atmosphere with an atmosphere consisting primarily (or exclusively) of an inert gas. An injection of the inert gas to the endangered or fire zone dilutes fire gases and reduces oxygen concentration. That interrupts the combustion process.
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Advanced fire prevention
Currently, inertion methods are the most common fire prevention measure in global mining.
Active firefighting happens when inert gases directly affect the fire, most commonly at its initial stage. Inertion can also be used in sealed areas, which indicates a passive form of firefighting.
Despite technological progress and modern fire prevention means available on the market the risk of endogenous fires in goaf areas within active coal mines is still very high. Modern fire prevention measures include atmosphere inertion in open or sealed goaf areas. It consists in lowering the oxygen content in the gas mixture to the value at which the process of coal self-ignition does not progress. This is done by injecting inert gases to mining workings and inactive goafs in an appropriate volume and at specified intervals.
Owing to its safety of use, physicochemical properties and economic reasons, nitrogen produced from atmospheric air is most frequently used for intering mine workings both in Polish and global mining industry.
Usually, for this type of application nitrogen with a residual oxygen content at 3-5% is used.
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Advanced fire prevention
Currently, inertion methods are the most common fire prevention measure in global mining.
Active firefighting is when inert gases directly affect the fire, most commonly at its initial stage. Inertion can also be used in sealed areas, which is a passive form of firefighting.
Despite technological progress and modern fire prevention means available on the market the risk of endogenous fires in goaf areas within active coal mines is still very high. Modern fire prevention measures include atmosphere inertion in open or sealed goaf areas. It consists in lowering the oxygen content in the gas mixture to the value at which the process of coal self-ignition does not progress. This is done by injecting inert gases to mining workings and inactive goafs in an appropriate volume and at specified intervals.
Owing to its safety of use, physicochemical properties and economic reasons, nitrogen produced from atmospheric air is most frequently used for intering mine workings both in Polish and global mining industry.
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