Research and numerical simulation of dynamic Nitrogen injection parameters in fully mechanized mining face
Aiming at the problems of resource waste and low efficiency in nitrogen injection engineering,a dy-namic nitrogen injection method is proposed in this paper.The measurement of"three zones"of spontaneous combustion in goaf is carried out around 884 working face of Zhuxianzhuang Mine,and oxygen concentration is obtained by continuous monitoring of beam tube data.According to the oxygen concentration content,the simu-lation software Fluent is used to build a calculation model to simulate the influence of different nitrogen injec-tion positions and nitrogen injection flow rates on the"three zones"distribution of spontaneous combustion,and the nitrogen injection parameters are dynamically optimized.The results show that when the nitrogen injec-tion position is 30～60 m away from the working face and the nitrogen injection amount is 440～500 m3/h,the dynamic nitrogen injection has the best anti-fire effect and the best benefit.
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