为了提高矿井综合块煤率，系统研究了影响块煤率的因素，认为优化爆破方案、减少块煤在运输诸多环节中损失是提高块煤率的关键。依据百善煤矿原煤的性质和特点，提出了松动预裂微差爆破的落煤方案，并对布孔参数和爆破参数进行了优化。针对块煤在运输转载环节损失严重的情况，提出了无落差平行转载技术和螺旋煤仓缓冲溜煤技术，阐述了其防破碎原理、结构和设计参数，并进行了试验研究。实践表明：松动预裂微差爆破技术可有效减小对煤体的破碎，提高块煤产出率；无落差平行转载技术和螺旋煤仓缓冲溜煤技术，大幅减少了块煤在运输转载环节中损失，基本达到了块煤的零破碎。%In order to improve the comprehensive lump coal rate of the mine, the paper systematically studied the factors affected to the lump coal rate and provided the optimized blasting plan. To reduce the lost of the lump coal in the transportation circulation would be the key to improve the lump coal rate. In according to the properties and features of the raw coal from Baishan Mine, a coal breakage plan with the standing pre-fracturing millisecond delay blasting was provided and the optimization was conducted on the borehole pattern param- eters and the blasting parameters. According to the lump coal serious lost in the transportation and transfer loading circulation, a no drop parallel transfer technology and the coal flow buffering technology of the helicoidal coal bunker were provided. The paper stated the broken proof principle, structure and design parameters and had a study on the test. The practices showed that the standing pre-fracturing milli- second delay blasting technology could effectively reduce the broken of the coal mass and could improve the lump coal production rate. The no drop parallel transfer technology and the coal flow buffering technology of the helicoidal coal bunker could highly reduce the lump coal lost during the transportation and transfer loading and could reach the zero broken of the lump coal basically.
展开▼
