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The Composition and Origin of PM 1-2 Microspheres in High-Calcium Fly Ash from Pulverized Lignite Combustion

Author

Listed:
  • Elena Fomenko

    (Institute of Chemistry and Chemical Technology, Federal Research Center “Krasnoyarsk Science Center of Siberian Branch of the Russian Academy of Sciences”, 660036 Krasnoyarsk, Russia)

  • Natalia Anshits

    (Institute of Chemistry and Chemical Technology, Federal Research Center “Krasnoyarsk Science Center of Siberian Branch of the Russian Academy of Sciences”, 660036 Krasnoyarsk, Russia)

  • Galina Akimochkina

    (Institute of Chemistry and Chemical Technology, Federal Research Center “Krasnoyarsk Science Center of Siberian Branch of the Russian Academy of Sciences”, 660036 Krasnoyarsk, Russia)

  • Leonid Solovyov

    (Institute of Chemistry and Chemical Technology, Federal Research Center “Krasnoyarsk Science Center of Siberian Branch of the Russian Academy of Sciences”, 660036 Krasnoyarsk, Russia)

  • Sergey Kukhteskiy

    (Institute of Chemistry and Chemical Technology, Federal Research Center “Krasnoyarsk Science Center of Siberian Branch of the Russian Academy of Sciences”, 660036 Krasnoyarsk, Russia)

  • Alexander Anshits

    (Institute of Chemistry and Chemical Technology, Federal Research Center “Krasnoyarsk Science Center of Siberian Branch of the Russian Academy of Sciences”, 660036 Krasnoyarsk, Russia
    Department of Chemistry, Siberian Federal University, 660041 Krasnoyarsk, Russia)

Abstract

This article presents the results of a systematic study on the composition and origin of PM 1-2 microspheres in high-calcium fly ash. The composition of individual microspheres was studied by scanning electron microscopy and energy-dispersive X-ray spectroscopy. It is shown that the compositions of the analyzed microspheres satisfy the general dependency with a high correlation coefficient: [SiO 2 + Al 2 O 3 ] = 88.80 − 1.02 [CaO + Fe 2 O 3 + MgO], r = −0.97. The formation pathway is parallel to the general trend: anorthite, gehlenite, esseneite, tricalcium aluminate, ferrigehlenite, and brownmillerite. The microspheres were classified into four groups depending on the content of major components: Group 1 (CaO > 40, SiO 2 + Al 2 O 3 ≤ 35, Fe 2 O 3 < 23, MgO < 16 wt %); Group 2 (30 < CaO < 40, SiO 2 + Al 2 O 3 ≤ 40, Fe 2 O 3 < 27, MgO < 21 wt %); Group 3 (CaO ≤ 30, 40 ≤ SiO 2 + Al 2 O 3 ≤ 75, Fe 2 O 3 < 10, MgO < 10 wt %); and Group 4 (14 < CaO < 40, SiO 2 + Al 2 O 3 < 14, Fe 2 O 3 > 30, MgO ≤ 14 wt %). A comparative analysis of the relationship between major component concentrations suggests the routes of PM 1-2 formation from feldspars and Ca–, Mg–, and Fe–humate complexes during lignite combustion.

Suggested Citation

  • Elena Fomenko & Natalia Anshits & Galina Akimochkina & Leonid Solovyov & Sergey Kukhteskiy & Alexander Anshits, 2022. "The Composition and Origin of PM 1-2 Microspheres in High-Calcium Fly Ash from Pulverized Lignite Combustion," Energies, MDPI, vol. 15(15), pages 1-15, July.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:15:p:5551-:d:876580
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