非间隔式注氮防灭火理论及技术研究
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摘要
我国矿井现阶段预防回采工作面采空区遗煤自燃普遍采用埋管注氮工艺,它主要存在两方面的严重缺陷:注氮点在空间上存在间隔,致使氮气在采空区未形成连续性分布,注氮惰化效果差,所需注氮量大;注氮埋管交替丢弃在采空区内,材料不能回收,造成极大的资源浪费,投入成本大。针对传统埋管注氮工艺的主要问题,提出了非间隔式注氮防灭火工艺,保持注氮点与工作面的同步移动,使注氮点在采空区保持空间上的连续。根据材料力学相关原理将非间隔式注氮防灭火工艺设计成边旋转边牵引的方式,利用注氮管路的抗剪切能力克服牵引过程中的最大阻力。运用岩土力学模拟软件FLAC3D模拟分析采空区注氮埋管管壁应力分布状态;基于弹性力学、结构力学与卸荷拱原理等相关理论,研究得出上覆岩层对采空区注氮埋管管壁施加载荷与非间隔式注氮防灭火工艺动力值的理论计算方法。基于煤氧复合理论,建立了采空区高温区域判别模型,为确定非间隔式注氮防灭火工艺实施的最佳注氮点位置提供了理论依据。理论分析研究了非间隔式注氮防灭火装备的牵引方式、计算了注氮管路各项参数、确定了各管段之间联接方法;设计加工了非间隔式注氮防灭火装备,并进行了现场试验校核与装备设计参数优化。
At present, the buried nitrogen injection process is commonly used to prevent the coal spontaneous combustion in gobs, there are two serious defects using the way, the first one is nitrogen injection sites have interval in the space, which results that nitrogen gas is not formed continuity distribution in the god and the effect of nitrogen injection is poor, then leads to the required injection rate is large; the second is the nitrogen injection pipes are alternately discarded in the gob and the material cannot be recycled, which results in a great waste of resources and large input cost. Considering the main problem of traditional nitrogen injection process, the technology of non-interval nitrogen injection for fire control was proposed that making the nitrogen injection sites keep pace with working face to cause the nitrogen injection sites maintain a continuous space. According to the relevant principles of material mechanics, the new technology of non-interval nitrogen for fire control, which was designed to drag with rotating, makes use of anti-shearing ability for the injection pipe to overcome the biggest obstacle in the towing process. FLAC3D was used to analyze the wall stress distribution of the nitrogen injection buried pipe in the goaf, then based on elasticity mechanics, structural mechanics, unloading arch principle and some related theories, the theoretical calculation method of calculating for load caused by overlying roak to buried pipe wall in the goaf, and calculating for dynamic value of the technology of non-interval nitrogen injection for fire control could be obtained. Based on the coal-oxygen comlex theory, the discriminant model of high temperature area distribution in goaf was built, which provides theoretical basis to confirm the best nitrogen injection position in goaf during the process of non-interval nitrogen injection for fire control. And the mode of traction for the non-interval nitrogen injection for fire control device was studied by theoretical analysis, various parameters nitrogen injection pipes were calculated, and the connection ways among pipes were determined. The device of non-interval nitrogen injection for fire control was designed and processed, and field experiment check and optimization of device design parameters were made.
引文
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