Abstract
The dry roll-type electrostatic coal beneficiation technology under high voltage is used to study the beneficiation of low-grade and high-ash coal in Inner Mongolia, northern China. The optimal coal beneficiation conditions are determined by adjusting three parameters: the electrode voltage, the distance between the electrode and the drum, and the angle θ of the electrode. The best quality clean coal is obtained under the condition of voltage of 30 kV, angle θ of 75°, and electrode distance of 7 cm. Moreover, after separation, the quality of clean coal accounted for 48.41% of the raw coal mass, while the ash ratio decreased from 38.6% of the raw coal to 18.71% of the clean coal, which significantly improves the coal usability. Finally, through the methods of combustion characteristics analysis, infrared spectrum analysis, and combustion exhaust gas analysis of raw and clean coal, it is proven that the roll-type electrostatic separation technology has a high coal beneficiation effect on the high-ash, low-grade coal in Inner Mongolia.
Highlights
Renewable energy sources can provide clean energy and reduce environmental pollution
The quality of clean coal accounted for 48.41% of the raw coal mass, the proximate analysis results of clean coal show that the ash content decreases from 38.60 to 18.71%, the volatile matter content increases from 33.20% to 44.60%, and the water content increases from
As this experiment uses the pure physical coal beneficiation method and no reagents are added, the results show that the compositions of raw coal and clean coal have not changed significantly
Summary
Renewable energy sources (solar power, hydropower, wind power, etc.) can provide clean energy and reduce environmental pollution. Energy sources such as nuclear energy, oil, and natural gas can be used more efficiently than coal, while leading to relatively less air pollution. The use of coal will inevitably cause environmental pollution, especially when low-grade coal with high ash content is used in thermal power stations, as it will cause serious air pollution, fly ash discharge, boiler slagging, and combustion efficiency reduction. In order to deal with this problem, low quality coal with a high ash content should be beneficiated before burning to improve coal quality. This paper studies the beneficiation of high-ash coal and the combustion characteristics of the clean coal
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