Optimization Improvement and Effect Analysis of Nitrogen Injection for Fire Prevention in Mined-out Area
In order to effectively prevent the spontaneous combustion of abandoned coal in the goaf and realize the safe mining of the mine,through the optimization and improvement of nitrogen injection technology,the nitrogen injection amount was determined to be 1 900 m3/h,and the nitrogen injection port location was 75 m.Nitrogen injection pipe diameter decreased from 202 mm to 171 mm.Shorten the nitrogen injection circuit and adopt non-spaced nitrogen injection process.After optimization,under continuous nitrogen injection,nitrogen concentration in the goaf gradually increases and oxygen concentration gradually decreases,and the inerting effect is obvious.After the field application,the concentration of CO in the inlet and return air lanes rose first and then decreased,and its concentration was less than 0.002 4%,to achieve the effect of fire prevention.
mined-out areanitrogen injection for fire preventionnitrogen injection rate
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