易自燃综放工作面快速拆架综合防灭火技术措施应用研究

Application of Comprehensive Fire Prevention during Support Removal of Spontaneous Combustion Coal Seam

针对官地矿易自燃煤层28417综放工作面拆除期间易着火情形,分析了造成自燃发火的危险因素,提出一条双通道快速拆架综合防灭火新思路,在官地矿28417综放拆架面采用人工-传感器联合监测、均压减漏风双通道快拆、注浆降温、注氮惰化、阻化剂喷洒隔绝等综合防灭火技术措施防治矿井火灾。结果表明:通过综合技术措施的实施,支架后部采空区温度控制在25℃左右,回风流CO的体积分数控制在了10×10^(-6)以下,拆架时间控制在40 d之内,确保了人员设备安全,工作面顺利实现了安全撤架封闭。为类似条件的工作面快速拆架综合防灭火工作积累了实践经验。

The 28417 fully-mechanized working face of spontaneous combustion coal seam in Guandi Mine is easy to catch fire during support removal.Hence,this article analyzes the risk factors of the spontaneous combustion and proposes a new comprehensive fire prevention with dual-channel rapid support removal.The comprehensive fire prevention technology includes manual-sensor monitoring,dual-channel rapid support-removal with equalizing pressure and reducing air leakage,cooling by grouting,inerting by nitrogen injection,and blocking agent spraying isolation.The results show that,the comprehensive fire prevention could control the temperature at the rear of the support in goaf to about 25℃,CO volume fraction in the return air flow below 10×10^(-6),and removal time within 40 days to ensure the safety of personnel and equipment and realize the safe support withdrawal,which could provide practical experience for the rapid support removal in the similar mines.