摘要:
为了解决铜川焦坪矿区易自燃厚煤层综放开采顶煤回采率低、采空区遗煤自然发火严重等难题,从大采高综采工作面割煤高度、装备配套选型、辅助运输、通风防灭火等技术方面,对3-2煤层采用大采高综采工艺进行了可行性论证。工业性试验结果表明:选用的ZY10500/27/58液压支架能够满足该工作面顶板支护要求,MG750/1860-GWD采煤机故障率低于10%,工作面采出率达到93.8%,平均推进速度119 m/月,工作面推进速度及回采率较综放开采工艺均有大幅度提高。同时,采空区散热带与氧化带最大宽度之和为95 m,束管采样气体中没有出现C2H2、C2H4气体,采空区未发生自燃,工作面安全生产形势有了根本性的好转。
Abstract:
In order to solve technical problems of low recovery rate and serious goaf spontaneous combustion in Jiaoping Mining Area, focusing on technical links s uch as reasonable cutting height of fully-mechanized working face, mining equipment selection and matching, auxiliary transportation, ventilation and goaf spontaneous combustion prevention, this paper made a comprehensive analysis on feasibility of fully-mechanized mining in No. 3-2 coal seam. The industrial test of trial working fac e showed that the ZY10500/27/58 hydraulic support could meet the roof supporting requirements, and the MG750/1 860-GWD miner had a failure rate lower than 10%. T he recovery rate reached to 93. 8% and advancing velocity amounted to 119 m per month, both of which had been greatly improved than top coal caving technology. Th e total width of heat dissipation and oxidized zone was 95 m. With neither C2H2、C2H4found in bundle tube monitoring system, nor spontaneous combustion in goaf, th e security situation of working face realized fundamental improvement.
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