漏风测定和煤温监测防治采空区煤炭自燃技术

Control Technology for Coal Spontaneous Combustion in Gobs Based on Air Leakage Determination and Coal Temperature Monitoring

选取SF6作为示踪气体,分别采用瞬时释放法和连续释放法对7312-2回采工作面邻近采空区漏风进行了定性和定量测定,并应用热电偶测温探头对邻近采空区煤温进行监测,得出漏风通道和漏风风速以及邻近采空区煤温的变化规律。研究结果表明,7312老空区向7312-2工作面回风巷漏风,最小漏风风速为0.009 55 m/s,缩面拆架过程采空区遗煤氧化,煤温持续升高至35℃,印证了漏风检测结果。通过采取堵漏和采空区灌浆等措施,有效解决了漏风和采空区煤炭自燃问题。

SF6is selected as the trace gas,the qualitative and quantitative determination of the air leakage in the adjacent gob of 7312- 2 working face was conducted respectively by the instantaneous release method and continuous release method,thermocouple temperature measuring probes were used to monitor the coal temperature in the adjacent gob,and the air leakage channel and velocity as well as the change regularity of coal temperature in the adjacent gob were obtained. The results showed that the air was leaked from the gob of 7312 working face to the air-return way of 7312-2 working face and the minimum air leakage velocity was 0. 009 55 m / s,the residual coal in the gob was oxidized in the process of the working face reduction and the support withdrawal and the coal temperature continued to rise to 35 ℃,which confirmed the detection results of air leakage.By taking the measures such as plugging and gob grouting,the problems of air leakage and coal spontaneous combustion in the gob were effectively solved.