Analysis of lump coal rate on fully mechanized coal mining face based on discrete element method
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摘要: 针对现有块煤率研究方法无法准确表达煤岩颗粒行为的问题,提出了基于离散元法的综采工作面块煤率分析方法。以MG450/1080-WD型采煤机为研究载体,对其采煤过程进行研究分析并建立煤岩颗粒的动力学模型;在此基础上,运用离散元软件EDEM作二次回归正交旋转组合试验,对综采工作面块煤率进行分析。分析结果表明,当MG450/1080-WD型采煤机滚筒转速为48.74 r/min,筒毂直径为233.79 mm,叶片螺旋升角为14.09°时,其性能最优,此时采煤机块煤率为36.52%。对比不同转速、叶片螺旋升角下块煤率的仿真与试验结果,得出块煤率变化趋势一致,证明了应用离散元法进行综采工作面块煤率分析的可行性。Abstract: In view of problem that existing lump coal rate research method cannot accurately express behavior of coal particles, an analysis method of lump coal rate on fully mechanized coal mining face based on discrete element method was proposed. Taking MG450/1080-WD type shearer as research carrier, the coal mining process was studied and analyzed, and dynamic model of coal rock particles was established. On this basis, discrete element software EDEM was used for quadratic regression orthogonal rotation combination test, and lump coal rate of the fully mechanized mining face was analyzed. The analysis results show that when drum speed is 38.74 r/min, hub diameter is 233.79 mm, and blade spiral angle is 14.09°, performance of MG450/1080-WD shearer is optimal, the lump coal rate is 36.52%. Simulation and test results of lump coal rate under different rotation speeds and blade spiral angles are compared, and the results show that the trend of lump coal rate is consistent, which proves the feasibility of using discrete element method to analyze lump coal rate of fully mechanized mining face.
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