综放面间歇式开采注氮对采空区氧化自燃区域的影响研究

发布时间：2018-03-05 10:37

本文选题：煤自燃　切入点：注氮　出处：《西安科技大学学报》2017年04期 　论文类型：期刊论文

【摘要】：为解决杨村矿间歇式开采且工作面推进速度慢而导致采空区遗煤自然发火危险性大的问题,探讨了杨村矿采用注氮方式预防煤自燃的可行性,并采用数值模拟确定了杨村矿采空区注氮参数以及注氮后采空区自燃危险区域。结果表明:未注氮时杨村矿316工作面采空区氧化升温带在进风侧40~110 m范围内,回风侧在10~40 m范围内。采取注氮措施后采空区氧化升温带起始位置向工作面移动,氧化升温带终止位置向采空区浅部方向大幅移动,氧化升温带宽度显著减小,进风侧最大减少80%,回风侧最大减少27%.正常开采期间采空区的最佳注氮量为400 m~3/h,最佳注氮位置为进风侧采空区深度40 m处,注氮后采空区氧化升温带范围为25~73 m,宽度为48 m.在停采期间,采取在上下隅角建密闭墙的方式,在采空区内深度30 m处连续注入400m~3/h的氮气,可将氧化升温带宽度缩小到32 m,有效的抑制了采空区煤自燃。
[Abstract]:In order to solve the problem of intermittent mining in Yangcun Mine and the slow speed of working face, which leads to the danger of coal spontaneous combustion in goaf, the feasibility of preventing spontaneous combustion of coal by nitrogen injection in Yangcun Mine is discussed. The parameters of nitrogen injection in goaf of Yangcun Mine and the danger area of spontaneous combustion in goaf after nitrogen injection are determined by numerical simulation. The results show that the oxidation heating zone of goaf of Yangcun Mine 316 working face is within 40110m of inlet wind when nitrogen is not injected. The return wind side is within 10 ~ 40 m. After nitrogen injection, the initial position of the oxidation heating zone in the goaf moves to the face, the end position of the oxidation heating zone moves significantly to the shallow part of the goaf, and the width of the oxidation heating zone decreases significantly. The maximum amount of nitrogen injection in goaf during normal mining is 400 mm3 / h, and the best position of nitrogen injection is at 40 m depth of goaf on the inlet side. After nitrogen injection, the range of oxidized heating zone in goaf is 257m and the width is 48m.In the period of stoppage, the closed wall is built in the upper and lower corner of the goaf, and the nitrogen gas is continuously injected into the goaf at the depth of 30m. The width of oxidation heating zone can be reduced to 32 m, which effectively inhibits the spontaneous combustion of coal in goaf.
【作者单位】：西安科技大学安全科学与工程学院;陕西省煤火灾害防治重点实验室;陕西建工第九建设集团有限公司;
【基金】：国家自然科学基金(51574193,51204135);国家自然科学基金青年基金(51504187) 陕西省教育厅专项(15JK1479)
【分类号】：TD752.2

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