非间隔式注氮防灭火工艺管路压力载荷研究

Nitrogen injection pipe surface pressure load of non-interval nitrogen injection for fire control

针对传统埋管注氮方式中采空区氮气分布不连续惰化效果差,管路资源浪费严重等重大缺陷,设计了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,实现了采空区中氮气的连续性分布,并且能回收注氮管材。采空区注氮管表面所受压力载荷大小计算方法的研究是成功实现非间隔式注氮防灭火工艺的基础。根据弹性力学中解平面问题与结构力学中两端固支梁结构的相关原理,分别推导并提出了采空区注氮管表面压力载荷的计算方法,分析了影响采空区注氮管表面压力载荷的因素。结合林南仓矿现场数值模拟结果,计算出综采工作面采空区注氮管表面的压力载荷。结果表明,两种计算方法所得的计算结果比较接近,在可接受的范围内,均是合理可行的。

Aiming at the problems of buried tube nitrogen injection that the nitrogen injection spot with intervals in the space causes the failure of continuous nitrogen distribution in goaf,leading to poor inert effect,in addition,the un-recycling of the nitrogen injection pipe causes the great resources waste,non-interval nitrogen injection process for fire control was designed which could make the nitrogen injection points keep pace with the coal face moving,fundamentally resolved the major defects existing in the way of traditional buried tube nitrogen injection,realized the continuous distribution of nitrogen in the goaf and recycles nitrogen injection pipe.The research of surface pressure load calculation of nitrogen injection pipe in goaf is the foundation to successfully realize the process of no-interval nitrogen injection for fire control.According to the relevant principles of solution plane problems in elastic mechanics and tow ends fixed supported beam structure in structural mechanics,surface pressure load calculation method of nitrogen injection pipe in goaf was derived and put forward and the influent factors of surface pressure load were analyzed of nitrogen injection pipe in goaf.Combining with the numerical simulation results of Linnancang Coal Mine,surface pressure load was calculated of nitrogen injection pipe in goaf of full-mechanized mining face.The results show that the consequences of two calculative methods are nearly similar.In the acceptable range,both calculative methods are reasonable and feasible.