Shanxi Jinhaiyang Energy Company Limited,China Coal Energy Group

为解决元宝湾煤矿近距离煤层群上部煤层开采存在的小煤矿破坏区和煤自然发火区对技改工作及后续安全生产构成的严重威胁,首先采取地面测氡的方式对火区的位置进行确定,再通过区段平行升压的措施降低火区对新作业区段的安全威胁;对4号煤层采空区进行地面与井下联合注氮处理,以减弱4号煤层火区的火势,对6103工作面注氮以达到抑制本工作面采空区遗煤自燃;最后对采空区进行注浆封堵。现场观测结果表明:采空区CO含量从5 000×10-6降为200×10-6,采空区温度从45℃降至21℃,使6103首采工作面煤自燃危害得到了有效控制。

In order to solve the serious threat to technical reconstruction and the follow-up safety production caused by the previous small mine failure zone and th e spontaneous combustion area existed in the top seam of the contiguous seams in Yuanbaowan Mine,a surface ground radon measuring method was firstly applied to determine the location of the fire area,secondly the sectional simultaneous pressure rising measures was applied to reduce the safety threat of the fire area to the new operation section. A combined nitrogen injection treatment at the surface ground and in the underground mine was conducted in the mining goaf of No. 4 seam to reduc e the fire situation of the fire area. The nitrogen injection in No. 6103 coal mining face was to restrain the residual coal spontaneous combustion in the goaf of the coal mining face. Finally,a grouting sealing was conducted in the goaf. The site observation results showed that the CO content in the goaf was reduced from 5 000 x 10-6to 200 x 10-6,the temperature in the goaf was reduced from 45 °C to 21。C and thus the coal spontaneous combustion danger of No.6103 first coal mining face threatened to the technical reconstruction was effectively controlled.