Single-Stage Aerodynamic Separation of Fly Ash Produced after Pulverized Combustion of Coal from the Ekibastuz Basin

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.

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Издание

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

Авторы

  • Kushnerova O.A. (Russian Acad Sci, Inst Chem & Chem Technol, Siberian Branch, Krasnoyarsk, Russia)
  • Akimochkina G.V. (Russian Acad Sci, Inst Chem & Chem Technol, Siberian Branch, Krasnoyarsk, Russia)
  • Fomenko E.V. (Russian Acad Sci, Inst Chem & Chem Technol, Siberian Branch, Krasnoyarsk, Russia)
  • Rabchevskii E.V. (Russian Acad Sci, Inst Chem & Chem Technol, Siberian Branch, Krasnoyarsk, Russia)
  • Anshits A.G. (Russian Acad Sci, Inst Chem & Chem Technol, Siberian Branch, Krasnoyarsk, Russia; Siberian Fed Univ, Krasnoyarsk, Russia)

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