Novel reverse-circulated excavating-drilling fluidized mining technique for steep-inclined coal seam
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摘要: 急倾斜煤层是广泛赋存于我国西部、南部等地区的复杂难采煤层，研发新型急倾斜煤层流态化无人开采方法对保障急倾斜煤层安全生产意义重大。为实现反循环连续式流态化开采，本文提出了一种深部急倾斜煤层流态化反循环钻采设备及工艺，设计了急倾斜煤层流态化反循环钻采一体机，论述了该钻采一体机的组成、架设方式和基本工作原理；提出了钻采平行作业工序，并解算了该反循环钻采方法的采煤工效、遗煤率、水射流辅助割煤和冲蚀落煤效率。结果表明，反循环钻采刀盘的直径越大，工作面采出率越高；在设计开采孔之间的重叠距离时，需要根据实际地质条件和目标采出率选用刀盘直径和开采孔重叠长度，保证较高的煤炭采出率；煤炭年产量随着刀盘推进速度的加快线性增加；钻采速度参数的选择和高压水射流辅助割煤工序对煤炭产量的提升具有重要影响。Abstract: The steep-inclined coal seams are widely distributed in western and southern China.These coal seams are complex and difficult for fully-mechanized coal mining.Therefore, developing a novel fluidized and intelligent mining method to recovery the steep-inclined coal seam is of great significance to ensure the safety production of coal.This paper proposed a reverse-circulated excavating-drilling method.A novel fluidized reverse-circulated mining machine was designed and the composition and utilization of this machine were introduced.Afterwards, the parallel excavating and drilling method of this machine is proposed.Finally, the coal mining efficiency, recovery rate and high-pressure water jet assisted coal cutting of this method were calculated.Results show that a larger diameter of cutting head always implies a greater coal mining efficiency.It is necessary to select a suitable diameter and overlap length of the cutter head according to the geological conditions and the target recovery rate of coal seam.It is found that the annual coal production linearly increased with the increasing cutter head advancing speed.Furthermore, a suitable drilling speed parameter and the utilization of the high-pressure water jet are both important to the increase of coal production.
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图 1 急倾斜煤层流态化反循环钻采方法示意图
Figure 1. The reverse-circulated excavating-drilling fluidized mining method for steep-inclined coal seam
图 3 反循环钻采一体机及钻机工位转换示意图(以导孔钻机为例)
Figure 3. The reverse-circulated excavating-drilling machine and its rig station adjusting method (take the hole drilling machine for example)
图 6 反循环钻采工艺和生产系统示意图
Figure 6. Schematic of reverse-circulated drilling and its production system
图 8 重叠长度和遗煤率之间的关系
Figure 8. Relationship between the overlap length and coal residual rate
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