黑龙江科技大学学报2024，Vol.34Issue(4)：510-516,536,8.DOI:10.3969/j.issn.2095-7262.2024.04.003
注氮条件下大采高综放工作面采空区自燃"三带"的分布规律
Distribution law behind spontaneous combustion"three zones"in goaf of fully mechanized top coal caving face with large mining height under nitrogen injection
摘要
Abstract
This paper aims to solve the increasing risk of the spontaneous combustion of the residual coal in goaf due to the high mining height,low recovery rate and strong mining disturbance on the large mining height fully mechanized working face.Taking a fully mechanized top coal caving face with large mining height in Ningxia Hui Autonomous Region as the research object,the study analyzes the laws of spatiotemporal evolution of oxygen concentration before and after nitrogen injetion and the distribution char-acteristics behind the spontaneous combustion"three zones"in goaf by using the permeability evolution e-quation and gas flow model.The results show that the oxygen concentration in goaf presents the distribution of inverted"U"shape with large part in middle and small parts at both ends under the condition of nitrogen injection.According to the oxygen concentration,the range of the oxidation zone features a crescent shape enlarging first and then reducing with the width maximum from 100 m without nitrogen injection to 50 m.According to wind speed,the range of the overall oxidation zone moves towards the working face by about 15 m compared with no nitrogen injection,effectively reducing the range of spontaneous combustion zone.关键词
注氮/综放工作面/采空区遗煤/自燃"三带"Key words
nitrogen injection/fully mechanized caving face/residual coal in goaf/spontaneous combustion"three zones"分类
矿业与冶金引用本文复制引用
侯宪港,辛世龙,韦宇翔,秦涛,傅永帅..注氮条件下大采高综放工作面采空区自燃"三带"的分布规律[J].黑龙江科技大学学报,2024,34(4):510-516,536,8.基金项目
黑龙江省省属高等学校基本科研业务费项目(2022-KYYWF-0538) （2022-KYYWF-0538）
