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Abstract Based on principle, characteristics and functions of nitrogen fire prevention technology, combined with the feature of rare fire and actuality of goaf in some mine, pure extinguishing nitrogen injection was adopted, nitrogen gas fire extinguishing system including nitrogen generating equipment, nitrogen management and nitrogen injection facilities was set up, relative parameters of fire area nitrogen injection were settled. The practice showed that the technology was with obvious effect, and decreasingly fire area, the temperature of the fire area descended to the standard scope, the toxic gas on the ground reduced greatly and ensured the safe mining.
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