Conclusions
This research has shown that both pressurized and suction configurations for utility pulverizers impart substantial and differential charge on mineral matter and combustible material in coal. The absolute value of the average charge per unit mass was the same order of magnitude for both utility systems and was in agreement with values obtained within a laboratory system. This differential charge can be utilized to beneficiate combustibles and mineral matter in-line between the pulverizers and burners under conditions typical to that of coal transport in the utility.
While these results indicate the potential for on-site power plant pulverized coal beneficiation, further work is required to assess the process. Towards that end, and based on results from the power plant test series, a facility to simulate mineral matter-combustible beneficiation under conditions similar to those expected in burner pipes is under construction.
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Stencel, J.M., Schaefer, J.L., Ban, H., Li, T., Neathery, J.K. (2002). Triboelectrostatic Coal Cleaning. In: Gupta, R.P., Wall, T.F., Baxter, L. (eds) Impact of Mineral Impurities in Solid Fuel Combustion. Springer, Boston, MA. https://doi.org/10.1007/0-306-46920-0_48
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DOI: https://doi.org/10.1007/0-306-46920-0_48
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