Relationship between oxidized spontaneous combustion zone and nitrogen injection quantity in goaf of fully-mechanized top coal caving mining face

in order to prevent the spontaneous combustion o.cured of coal let in the goaf during the face pushing forward of No.12201illy-mechanized top coal caving mining face in Liuta Mine, COMSOL Multphysics software was applied to studythe distributon law of oxidized spontanecus combution zone in thegoar ner thecondtion of different nirogen injecion quanit .The study resut showed that with the ntrogen injecion quantify increased,the ntial location of the owdized sponianeus combustion zone was moved along th direction of the coal mining face,ut it was not highly infuenced by the ntragen infecion quantitythe feminal ocation of theoxidized sponaneous combution was ighly infuenced by the ntirogen inje ction and was obviousiy moved forward to the direction of the coal mining face and thus thewiath of the oxidized spomtaneous combustion zone was seadil reduced. The ntragen injecion quanity and the oxidized spomtaneous combustion zone with coud approximately meet the relationshipo of the power exponent.T'he optimum nirogen inj ction quantty calculated was 860 mi3 h and the width of the oxidized spontaneouscombustion zone was 55 m.