College of Energy, Xi'an University of Science and Technology Key Laboratory of Western Mine and Hazard
Prevention, Ministry of Education of China Baoji Qinyuan Coal Industry Co. , Ltd.

针对秦源煤矿S205综放工作面在停采撤架期间出现CO浓度超限,可能发生采空区遗煤自燃的问题,从工作面地质构造、遗煤量、漏风等方面分析了回风流CO浓度超限的原因,并针对该工作面的实际情况和各种防灭火技术的特点,按照尽快减少采空区漏风、降低采空区氧浓度、消除高温点的原则,采取了以局部通风、高位钻孔注浆和架前钻孔注高分子胶体为主的综合防灭火技术,使回风流CO体积分数降到了24×10-6以下,保证了工作面支架的安全撤出。

According to CO content over limit occurred in No. S205 fully- mechanized top coal caving mining during the period of the terminal mining and the power ed supports withdrawing in Qinyuan Mine and the spontaneous combustion of coal left in the goaf, from the geological structure of the coal mining face, coal quantity lef t, ventilation leakage and other aspects, the paper analyzed the abnormal causes of CO in the air returning flow. According to the actual conditions of the coal mining fa ce and the features of each fire prevention and control technology, based on the principles to quickly reduce ventilation leakages in the goaf, in order to reduce the oxy gen content in the goaf and to eliminate high temperature points, a comprehensive fire prevention and control technology mainly with the local ventilation, high level bor ehole grouting and high polymer gum injection in the boreholes in front of the powered supports was conducted to reduce the CO volume fraction in the air returning flo W below 24 x 10- 6and to ensure the safe withdrawing of the powered supports from the coal mining face.

国家自然科学基金重点资助项目(51134019)；国家自然科学基金资助项目(10972178)；国家自然科学基金青年基金资助项目(51004081)；