Nitrogen Fire - Prevention is the technology to inject nitrotion into the oxidation goaf or fire zone to prevent fire with the purpose of decreasing oxygen content lower to 7% or 3% . Because of the efficiency of nitrogen fire - prevention , the technology is rapidly promoted in the coal mines in recent years , and is regarded as the important technology in 11th Five - Year Plan .
High pressure of releasing nitrogen , fit for the long - distance transmission of mine ;
Reasonable purity to ensure the fire - prevention to achieve high efficiency and energy saving ;
Transport conveniently to the vicinity of nitrogen injection area , and could be installed on the tramcar at the same width with the track ;
Safe , stable and reliable equipment , automatic and unmanned control .