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The Composition and Origin of PM1-2 Microspheres in High-Calcium Fly Ash from Pulverized Lignite Combustion

Описание

Тип публикации: статья из журнала

Год издания: 2022

Идентификатор DOI: 10.3390/en15155551

Ключевые слова: fly ash, lignite, microsphere, mineral precursor, particulate matter, sem-eds

Аннотация: This article presents the results of a systematic study on the composition and origin of PM1-2 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 Показать полностьюthe general dependency with a high correlation coefficient: [SiO2 + Al2O3] = 88.80 − 1.02 [CaO + Fe2O3 + 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, SiO2 + Al2O3 ≤ 35, Fe2O3 < 23, MgO < 16 wt %); Group 2 (30 < CaO < 40, SiO2 + Al2O3 ≤ 40, Fe2O3 < 27, MgO < 21 wt %); Group 3 (CaO ≤ 30, 40 ≤ SiO2 + Al2O3 ≤ 75, Fe2O3 < 10, MgO < 10 wt %); and Group 4 (14 < CaO < 40, SiO2 + Al2O3 < 14, Fe2O3 > 30, MgO ≤ 14 wt %). A comparative analysis of the relationship between major component concentrations suggests the routes of PM1-2 formation from feldspars and Ca–, Mg–, and Fe–humate complexes during lignite combustion. © 2022 by the authors.

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Издание

Журнал: Energies

Выпуск журнала: Vol. 15, Is. 15

Номера страниц: 5551

ISSN журнала: 19961073

Издатель: MDPI

Персоны

  • Fomenko E. (Institute of Chemistry and Chemical Technology, Federal Research Center “Krasnoyarsk Science Center of Siberian Branch of the Russian Academy of Sciences”, Krasnoyarsk, 660036, Russian Federation)
  • Anshits N. (Institute of Chemistry and Chemical Technology, Federal Research Center “Krasnoyarsk Science Center of Siberian Branch of the Russian Academy of Sciences”, Krasnoyarsk, 660036, Russian Federation)
  • Akimochkina G. (Institute of Chemistry and Chemical Technology, Federal Research Center “Krasnoyarsk Science Center of Siberian Branch of the Russian Academy of Sciences”, Krasnoyarsk, 660036, Russian Federation)
  • Solovyov L. (Institute of Chemistry and Chemical Technology, Federal Research Center “Krasnoyarsk Science Center of Siberian Branch of the Russian Academy of Sciences”, Krasnoyarsk, 660036, Russian Federation)
  • Kukhteskiy S. (Institute of Chemistry and Chemical Technology, Federal Research Center “Krasnoyarsk Science Center of Siberian Branch of the Russian Academy of Sciences”, Krasnoyarsk, 660036, Russian Federation)
  • Anshits A. (Institute of Chemistry and Chemical Technology, Federal Research Center “Krasnoyarsk Science Center of Siberian Branch of the Russian Academy of Sciences”, Krasnoyarsk, 660036, Russian Federation, Department of Chemistry, Siberian Federal University, Krasnoyarsk, 660041, Russian Federation)

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