ABSTRACT

Low-rank steam coal is an important coal resource, but has high water and ash content, which needs to be separated to improve its quality and calorific value. In this paper, the process of screening using a flip-flow screen and density separator using a shallow groove dense-medium separator for steam coal was proposed and applied to the Lijiahao coal preparation plant. Kinematics of the screen box and the surface of the flip-flow screen were investigated using an acceleration and laser displacement measurement and analysis system. The mechanism of the flip-flow screen to overcome aperture blocking and to enhance the screening performance for moist and fine coal was discussed. The results from an industrial experiment when screening at 3 mm showed that the screening efficiency was 82.51%, while the total misplaced materials were 5.91%. The commercial separation of a wide size range of coal using a shallow groove dense-medium separator was analyzed. The results showed that the system exhibited satisfactory separation performance for 100–3 mm coal, whereas the corresponding E_p value was found to be 0.06 g/cm³. Compared with the 6 mm separation system, the yield of clean coal increased by 8.50%, which remarkably increased the economic benefits for the company.

摘要

低阶动力煤是重要的煤炭资源，但含水量和灰分含量高，需要进行分离以提高其质量和热值。本文提出了采用翻转流筛进行筛分和采用浅槽重介分离器进行动力煤的密度分离器工艺，并将其应用于李家豪选煤厂。使用加速度和激光位移测量和分析系统研究筛箱和翻转流筛表面的运动学。讨论了翻转流筛克服孔径阻塞和提高湿煤和细煤筛分性能的机理。工业实验结果表明，3mm筛分筛分效率为82.51%，错位率为5.91%。分析了使用浅槽重介分离器对广泛粒度范围煤的商业分离。结果表明，该系统对 100 ～ 3 mm 的煤表现出令人满意的分离性能，而相应的发现E _p值为0.06 g/cm ³。与6mm分离系统相比，精煤产量提高了8.50%，显着提高了公司的经济效益。