基于光纤测温技术判定采空区自燃危险区域的研究

Study on the identification of spontaneous combustion hazard area in goaf based on optical fiber temperature measurement technology

为了加强对煤矿采空区自然发火的预防,提出使用新型光纤传感测温技术实现对采空区高温区域的精确判断。通过室内试验完成了对光纤测温装置温度精度、定位精度及响应时间的测定,并对光纤在采空区内部的布置手段进行了阐述,将光纤测温结果与束管监测结果进行比对,探讨了光纤测温的可靠性。该采空区自燃“三带”分布情况:35 m以内为散热带,35~110 m内为自燃带,运输巷一侧自燃带延伸至120 m处,110 m以外为窒息带,与束管监测数据基本相符;采空区内部高温区域出现在距离工作面80~100 m内,高温点出现在采空区距工作面100 m,距离运输巷50 m附近,光纤测温系统检测数据在作为有效的采空区自燃危险区域判定依据的同时,还可实现对高温区域的定位。

In order to strengthen the prevention of spontaneous combustion in goaf of coal mine,a new optical fiber sensing temperature measurement technology was proposed to accurately determine the high temperature area of goaf in this paper.Through laboratory tests,the temperature precision,positioning accuracy and response time of the optical fiber temperature measuring device were measured,the arrangement means of optical fiber in goaf interior were also described.The reliability of optical fiber temperature measurement was discussed by comparing the optical fiber temperature measurement results with the beam tube monitoring results.The distribution of“three zones”of spontaneous combustion in goaf is as follows:the scattered tropical zone is within 35 m,the spontaneous combustion zone is between 35 m and 110 m,the spontaneous combustion zone on the side of the transport gateway extends to 120 m,and the suffocation zone is 110 m away,which is basically consistent with the beam tube monitoring data;the high temperature area inside the goaf appears within 80 m to 100 m from the working face,the high temperature point appears in the goaf 100 m away from the working face and 50 m away from the transport gateway.The fiber optic temperature measurement system is used as the effective basis for determining the risk area of spontaneous combustion in goaf,and also can be used to locate the high temperature area.