Gob natural fire control method
A natural fire and goaf technology, applied in dust prevention, mining equipment, earthwork drilling, etc., can solve the problems of limited fire prevention effect, low recovery rate of top coal, poor operability, etc., to improve fire prevention and extinguishment The effect of ensuring smooth mining and improving the recovery rate
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[0026] The method for preventing and controlling spontaneous combustion in the goaf of the present invention includes:
[0027] (1) Nitrogen injection, the point of nitrogen injection is 30-60 meters away from the working surface, and the amount of liquid nitrogen is 2000m 3 / h;
[0028] (2) Reduce the amount of air leakage in the goaf, reduce the pressure difference of the working face, control the pressure difference of the working face within 120Pa, and block the areas where the roof cantilever beams are formed on the inlet and return sides of the goaf. Hengchuan in the goaf is sealed in time;
[0029] (3) Speed up the advancement of the working face, the working face progress is 4m / d;
[0030] (4) Increase the recovery rate and control the thickness of the remaining coal below 1.3 meters.
[0031] Taking the 8101 working face of Tongxin Mine of Tongmei Group as an example, the technical solution required by the present invention will be described in detail.
[0032] 1. Nitrogen in...
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