Limit Moisture Content of Coal Concentrate Produced with Industrial Drainers
M. I. SHILYAEV1, A. I. GORBUNKOV2, A. R. BOGOMOLOV3, E. M. KHROMOVA1, E. YU. TEMNIKOVA4
1Tomsk State University of Architecture and Building, pl. Solyanaya 2, Tomsk, 534003 Russia
2Chemicals Plant Research and Production Association, ul. Pritomskaya naberezhnaya 13, Kemerovo, 650000 Russia
3Kutateladze Institute of Thermophysics, Siberian Branch, Russian Academy of Sciences, pr. Akademika Lavrentieva 1, Novosibirsk, 630090 Russia
4Gorbachev Kuzbass State Technical University, ul. Vesennyaya 28, Kemerovo, 650000 Russia
Keywords: обезвоживание, угольная суспензия, центрифугирование, коэффициент поверхностного натяжения, коэффициент динамической вязкости, порозность, диаметр угольных частиц, вакуум-фильтры, фильтр-прессы, влажность, dewatering, coal suspension, centrifuge process, surface tension coefficient, dynamic viscosity coefficient, fractional void volume, coal particle diameter, vacuum filter, filter press, moisture content
Abstract
The process of coal suspension dewatering in centrifuges and pneumatic drainage in vacuum filters and filter presses is theoretically studied. From the condition of equal centrifugal forces and surface tension applied to liquid in a granular layer of the working element of the centrifuge bowl, the analytical relation is obtained to calculate residual concentration of liquid in the treated layer. It is shown that calculation results obtained using the relation, rated data and specifications of industrial drainers agree well. With regard to the equality between the kinetic energy applied by filtration flow in the granular layer to the liquid film in the granules and the work to overcome surface tension forces that keep the film on the surface of the granules, the analytical relation is obtained to calculate residual concentration of liquid in the layer under pneumatic drainage. The estimates prove realistic nature of the results obtained with the latter relation as well as their agreement with the test and rated data of industrial vacuum filters and filter presses.
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