双马一矿I02采区6煤层采空区自然发火“三带”划分及防控技术研究

Study on “Three Zones” Division and Prevention and Control Technology of Spontaneous Combustion in Goaf of 6 Coal Seam in I02 Mining Area of Shuangma No. 1 Coal Mine

摘要: 针对国家能源集团宁夏煤业双马一矿I02采区6煤层易自燃的特性，采用束管监测 + 温度实测相结合的现场观测方法，对I020601综采工作面采空区开展自然发火“三带”测定与划分。以氧气浓度为主要划分指标、温度为辅助指标，确定采空区散热带、氧化带、窒息带分布范围；结合煤层最短自然发火期，计算工作面安全最小推进速度，并据此提出配套防灭火措施。结果表明：工作面回风侧散热带宽度18.0~21.6 m、氧化带宽度94.4~99.2 m，进风侧散热带宽度27.2~29.4 m、氧化带宽度111.8 m；采空区距离工作面大于139.0~141.2 m区域为窒息带；工作面最小安全推进速度为3.5 m/d，现场实际推进速度5.0 m/d，满足防自燃要求。研究成果可为该矿井及同条件工作面采空区自燃防控提供技术参考。

Abstract: In view of the characteristics of spontaneous combustion of No. 6 coal seam in I02 mining area of Shuangma No. 1 Coal Mine of Ningxia Coal Industry Group, the field observation method combining beam tube monitoring and temperature measurement is used to measure and divide the “three zones” of spontaneous combustion in the goaf of I020601 fully mechanized mining face. Taking oxygen concentration as the main dividing index and temperature as the auxiliary index, the distribution range of heat dissipation zone, oxidation zone and suffocation zone in goaf is determined. Combined with the shortest spontaneous combustion period of coal seam, the minimum safety advance speed of working face is calculated, and the corresponding fire prevention and extinguishing measures are put forward. The results show that the width of the heat dissipation zone on the return air side of the working face is 18.0~21.6 m, the width of the oxidation zone is 94.4~99.2 m, the width of the heat dissipation zone on the inlet side is 27.2~29.4 m, and the width of the oxidation zone is 111.8 m. The area where the goaf is greater than 139.0~141.2 m from the working face is the suffocation zone; the minimum safe advance speed of the working face is 3.5 m/d, and the actual advance speed on site is 5.0 m/d, which meets the requirements of anti-spontaneous combustion. The research results can provide technical reference for the prevention and control of spontaneous combustion in the goaf of the mine and the working face under the same conditions.