论文部分内容阅读
注氮防灭火是预防采空区煤自燃,惰化火区的主要方法。传统的埋管注氮过程中注氮点在空间上存有间隔,N2在采空区未形成连续性分布,惰化效果差,注氮量大,而且注氮管不能回收,造成极大的资源浪费。基于采空区注氮管的抗剪切能力优于抗拉能力这一原理,具体设计了旋转牵引方式的非间隔式注氮防灭火工艺,可使注氮点与采煤工作面保持同步移动,从根本上解决了传统埋管注氮方式中存在的重大缺陷,实现了采空区中N2的连续性分布和注氮管材的回收。以塔山矿8104工作面为例,数值模拟并对比分析了非间隔式注氮与传统埋管注氮的惰化效果。结果表明:非间隔式注氮防灭火可有效减少采空区氧化带宽度,惰化效果明显。同时,基于卸荷拱原理与非开挖管道定向穿越技术中穿越管段回拖力的计算方法,得到非间隔式注氮防火工艺牵引动力计算公式。
Nitrogen injection fire prevention is to prevent spontaneous combustion of coal in the area, the main method of inerting fire area. Nitrogen injection in the traditional process of injecting nitrogen in the space there is space in the interval, N2 in the goaf did not form a continuous distribution, inerting effect is poor, a large amount of nitrogen, and nitrogen tube can not be recycled, resulting in a great Waste of resources. Based on the principle that the anti-shear capacity of the nitrogen injection pipe in the goaf is better than that of the tensile strength, a non-interval nitrogen injection fire-extinguishing process with rotary traction is specifically designed to keep the nitrogen injection point and the coal mining face moving synchronously , Which fundamentally solved the major shortcomings in the traditional method of injecting nitrogen in buried pipes and realized the continuity distribution of N2 and the recovery of nitrogen-injected pipes in the goaf. Taking Tashan 8104 face as an example, numerical simulation and comparative analysis of the inerting effects of nitrogen injection and non-spacing nitrogen injection were carried out. The results show that non-spacing nitrogen injection can effectively reduce the oxidation zone width of goaf, and the inerting effect is obvious. At the same time, based on the principle of unloading arches and the calculation method of back drag force of the cross-section pipelines in the directional drilling technology of non-digging pipeline, the formula of traction power of non-interval nitrogen injection fire protection process is obtained.