Application of spontaneous combustion control technology in stepped coal body island mining
The 1306 working face is empty on all sides,isolated island layout,and stratification mining,and there are left coal pillars in the upper layer,forming a special step structure.In view of the fact that 1306 working face has many air leak-age channels with the greater risk of spontaneous ignition,targeted fire prevention measures are formulated in two stages:normal mining and withdrawal.During the mining period,some measures were taken,such as spraying along the goaf,nitro-gen injection,gel injection in stopping line,gel injection in goaf,and spraying retarding agent in coal residue.Through the coupling analysis of safety monitoring system,mined-out area micro-air leakage monitoring system and manual detection da-ta,the verification and analysis of the fire prevention effect of 1306 working face are carried out.It is concluded that the fire prevention measures of 1306 working face are properly implemented,affirming the effectiveness of spontaneous combustion prevention and control technology of step coal body island mining,and substantial suggestions are put forward for mining un-der similar conditions.Our study lay a solid foundation for the follow-up work of fire prevention and suppression on irregular working face.
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