【摘要】 为有效防治采空区遗煤自燃,以瑞安矿014N1^-1综放工作面为研究对象,监测工作面供风量为1 150 m³/min时的氧气浓度及漏风速度数据;基于采空区自燃"三带"划分标准和数值模拟方法,利用Comsol软件研究工作面不同供风量时采空区自燃带随回采时间的动态变化,确定稳定阶段自燃带的范围,得到工作面供风量与自燃带宽度的拟合曲线;提出构筑风流隔离墙与注氮相结合的防灭火技术。结果表明:随工作面供风量的增加,自燃带边界向采空区深部延伸,自燃带宽度也逐渐加大;在现有开采条件及推进速度下,工作面供风量应低于1 500 m³/min;风流隔离墙与注氮相结合的防灭火技术,可使采空区自燃带宽度降至24. 6 m,防灭火效果较好。更多还原

【Abstract】 In order to effectively prevent and control coal spontaneous combustion in goafs,studies were carried out with 014 N1^-1 fully mechanized mining face of Ruian Mine as an object to acquire the data of oxygen concentration and air leakage speed under the condition where the actual air supply volume of the working face was 1 150 m³/min. According to the " three zones" division standard of coal spontaneous combustion in goafs and numerical simulation method,the dynamic change of spontaneous combustion zones under different supply volumes of air was studied by using Comsol software,then the scope of spontaneous combustion zone was determined,and the fitting curve of the mining face’s air supply volumes and width of the zone was obtained. Finally,the fire prevention and extinguishing technology,which combined air flow separation wall with nitrogen injection,was put forward. The results show that as the air supply volume raises,the boundary of the spontaneous combustion zone expands to the deep section of goafs and its width also increases gradually,and the air supply of working faces should be lower than1 500 m³/min in view of the current mining conditions and heading speed. It is also found that the technology which features a combination of air flow separation wall and nitrogen injection can shrink the spontaneous combustion zone to a width of 24. 6 m,and it proves to have better effect in fire prevention and extinguishment.更多还原