Simulation of goaf heating law and the fire cooling effect during methane drainage in high level laneway

For spontaneous combustion possibilities under large flux methane drainage in the goal, dynamic permeability in combination with the Forchheimer nonlinear equation was used to solve the problem of 3D oxygen distribution, heating law in goaf and to forecast the effects of fire protection by taking the fifth section face of the No. 18 coal seam in Nanshan Coal Mine as the basis for this study. The results demonstrate that if the vertical position of the drainage laneway is so low as to cause serious air leakage, a high oxygen concentration area exists in the return side of the goaf, and there is also a high temperature region which has faster heating rate than in the other areas. The effect of methane drainage on goal heating can be alleviated dramatically by simultaneous plugging and nitrogen injection. The results show that gas data in the return side of the goaf must be detected carefully in the work face, which is of similar drainage arrangement. Therefore, comprehensive fire protection measures should be carried out if conditions permit.

无人机施药防治草原惶虫初步试验报告

为适应现代化草原虫害应急防治的趋势,2020年6月23日-7月8日,伊宁县草原管理工作站联合伊犁伊瑞有害生物防治有限公司,在伊犁哈萨克自治州伊宁县喀什镇草原蝗虫灾害发生严重的区域进行了无人机施药防治草原蝗虫操作。笔者进行调查后总结数据,结果表明,用无人机喷施4.5%氯氰菊酯防治草原蝗虫,施药后10 d,防效达98%,效果显著,可在生产上推广应用。