Тип публикации: статья из журнала
Год издания: 2018
Идентификатор DOI: 10.3103/S0361521918030059
Ключевые слова: aerodynamic classification, fly ash, narrow fraction
Аннотация: The single-stage separation of fly ash from field 1 of the electrostatic precipitator of Reftinskaya GRES (Regional Thermal Power Plant), which burns coal from the Ekibastuz Basin, was performed by aerodynamic classification with the use of a flow of air. It was found that, at a constant airflow rate of 50 m(3)/h, the morphologically uniform fractions of small spherical particles with a narrow distribution, for which d (max) was 2, 3, and 4 mu m and d (90) was 4, 6, and 8 mu m, can be separated by decreasing the speed of the classifier rotor from 22000 to 10000 rpm. At a minimum speed of 2000 rpm, the target product of separation was a narrow fraction containing large particles, which were characterized by d (max) of 109 mu m and d (90) of 205 mu m. It was established that SiO2 and Al2O3 were the basic chemical components of the fractions obtained, and the total concentration of these components was as high as 86-91 wt %. With increasing the size of fractions with dmax from 2 to 116 mu m, a decrease in the concentration of SiO2 and an increase in the amounts of Al2O3 and Fe2O3 were observed. The dependence of phase composition on the particle size was established for the small fractions: as d (max) was increased in a range of 2-25 mu m, a monotonic decrease in the concentration of a quartz phase and an increase in the concentration of mullite were observed; the concentration of a Fe-containing spinel phase also increased.
Журнал: SOLID FUEL CHEMISTRY
Выпуск журнала: Vol. 52, Is. 3
Номера страниц: 188-200
ISSN журнала: 03615219
Место издания: NEW YORK
Издатель: ALLERTON PRESS INC
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