注氮对采空区自燃“三带”影响的考察

Examination of Nitrogen Injection Effect on"Three Zones"of Spontaneous Combustion in Goaf

针对注氮对采空区“三带”范围的影响问题,在皖北某一工作面分别进行了有/无注氮操作下的采空区温度和氧气浓度检测。基于氧气浓度指标,发现注氮操作对采空区“三带”划分范围影响不大,但是在采空区中存在明显的氮气影响区域,并依据氧气浓度基本确定了该区域范围。在实际工程中,可通过调整注氮参数,将氮气影响区域的氧气浓度降至窒息带氧气浓度,从而获得最佳的注氮操作参数。

For the influence of nitrogen injection operation on the division of"three zones"in goaf,the temperature and oxygen concentration of the goaf with or without nitrogen injection operation were respectively measured at a working face in Huaibei.Based on the oxygen concentration index,founding that nitrogen injection operation had little effect on the division range of goaf"three zones".Secondly,the nitrogen effect existed in the whole goaf,and the range can be basically determined according to oxygen concentration.In terms of engineering,the oxygen concentration in the nitrogen-affected area could be reduced to the oxygen concentration of the asphyxiation zone via adjusting the nitrogen injection parameters,so as to obtain the best nitrogen injection operating parameters.