沿空掘巷工作面停采期煤自燃防治技术

发布时间：2018-05-10 12:55

本文选题：受压煤柱 + 煤炭自燃　；参考：《煤炭科学技术》2015年03期

【摘要】：为有效防治沿空掘巷工作面回采期间煤自燃,在实验室测试并分析了32煤层自燃指标气体及临界值;采用UDEC软件对沿空掘巷遗留小煤柱的稳定性进行了分析,得出煤柱受到的最大垂直应力为12 MPa,垂直方向和水平方向最大位移分别为2.076、0.547 1 m;采用Fluent软件分析了受压小煤柱易自燃区域情况,得出小煤柱采空区侧方向25~75 m属于自燃氧化带的范围。根据分析结果采取了降低风量、指标气体监测点优化及安全预警临界值量化、采空区和小煤柱易自燃区域内埋管注三相泡沫为一体的煤炭自燃防治措施,工作面停采半年期间其上隅角支架后CO体积分数稳定在20×10-6左右,O2体积分数保持在18%,取得了较好的自燃防治效果。
[Abstract]:In order to effectively prevent coal spontaneous combustion during coal mining in goaf roadway working face, the index gas and critical value of spontaneous combustion in 32 coal seam were tested and analyzed in laboratory, and the stability of small coal pillar left over in goaf roadway was analyzed by UDEC software. The maximum vertical stress of coal pillar is 12 MPA, and the maximum displacement in vertical direction and horizontal direction is 2. 076 ~ 0. 547 1 m respectively. The spontaneous combustion zone of small coal pillar under pressure is analyzed by Fluent software. It is concluded that 2575 m of side direction of mined-out area of small coal pillar belongs to the range of spontaneous combustion oxidation zone. According to the results of the analysis, coal spontaneous combustion prevention and control measures are adopted, such as reducing air volume, optimizing index gas monitoring points, quantifying critical value of safety early warning, and injecting three-phase foam into buried pipe in goaf and small coal pillar spontaneous combustion area. The CO volume fraction of the upper corner support is stable at about 20 脳 10 ~ (-6) and the volume fraction of O _ (2) is kept at 18 during the half year when the working face is stopped from mining. A good effect of preventing and controlling spontaneous combustion has been obtained.
【作者单位】：中国矿业大学安全工程学院;皖北煤电集团有限责任公司钱营孜煤矿;
【基金】：国家自然科学基金煤炭联合基金重点资助项目(U1361213) 中国矿业大学大学生创新创业基金资助项目(201405) 煤炭资源与安全开采国家重点实验室大学生科技创新计划资助项目(SKLMD2014008)
【分类号】：TD752.2

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