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In-situ Measurement of Sodium and Potassium Release during Oxy-Fuel Combustion of Lignite using Laser-Induced Breakdown Spectroscopy: Effects of O-2 and CO2 Concentration

He, Yong ; Zhu, Jiajian ; Li, Bo ; Wang, Zhihua ; Li, Zhongshan ; Aldén, Marcus ; Cen, Kefa

Energy & fuels, 2013-02, Vol.27 (2), p.1123 [Periódico revisado por pares]

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  • Título:
    In-situ Measurement of Sodium and Potassium Release during Oxy-Fuel Combustion of Lignite using Laser-Induced Breakdown Spectroscopy: Effects of O-2 and CO2 Concentration
  • Autor: He, Yong ; Zhu, Jiajian ; Li, Bo ; Wang, Zhihua ; Li, Zhongshan ; Aldén, Marcus ; Cen, Kefa
  • Assuntos: Atom and Molecular Physics and Optics ; Atom- och molekylfysik och optik ; Fysik ; Natural Sciences ; Naturvetenskap ; Physical Sciences
  • É parte de: Energy & fuels, 2013-02, Vol.27 (2), p.1123
  • Descrição: Laser-induced breakdown spectroscopy (LIBS) was used in this study to measure quantitatively the sodium (Na) and potassium (K) release from burning coal particles under oxy-fuel combustion environments. A specially designed laminar premixed burner was employed to provide a postflame environment with different O-2 and CO2 concentrations, in which the effects of O-2 and CO2 on the release of Na and K during coal oxy-fuel combustion were studied systematically. For the devolatilization stage, neither O-2 nor CO2 had significant influence on the Na and K release. The release of Na and K during the char stage, however, changed significantly at different O-2 and CO2 concentrations. Under these experimental conditions, when the O-2 concentration increased from 3.9% to 10.6%, the peak concentration of Na at the char stage increased from 15.2 mg/m(3) to 33.7 mg/m(3), and the maximum concentration of K increased from 6.2 mg/m(3) to 11.7 mg/m(3). When the CO2 concentration increased from 35.8% to 69.4%, the release of Na and K was inhibited during the char stage, with the peak concentration decreasing from 8.9 mg/m(3) to 6.9 mg/m(3) for Na and from 3.7 mg/m(3) to 2.4 mg/m(3) for K. During the ash stage, the release of Na and K decreased with the O-2 concentration, whereas it increased with the CO2 concentration.
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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