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Quantitative phase analysis and rietveld texture determination of minerals in ash deposits in a 11.2 MW moving grate boiler

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  • Yongtie, Cai
  • Zhimin, Zheng
  • Guang, Zeng
  • Wen, Wen
  • Lei, Luo
  • Wenming, Yang

Abstract

Some ash deposits were sampled from a 11.2 MW moving grate boiler to study the mineral transformation, ash deposition and mineral texture evolution behavior, which were determined by different analytical methods. Rietveld refinement was applied to determine the mineralogy, refine the crystallographic structures of minerals, and characterize texture heterogeneity of minerals in ash deposits. The results presented that the major mineral phases in ash deposits were identified as silicates, oxides, sulphates, sulfides and carbonates. The phase transformation between minerals during combustion was proposed. The variation of the diffraction peak intensities indicated the existence of the weak and strong textures. The texture indexes were larger than one mrd2 for most minerals, implying strong preferred orientation distributions, while the texture indexes of some other minerals were approaching one mrd2, indicating the existence of weak and random textures. Some pole figures showed strong texture features with a high degree of texture disorder in these minerals, while other minerals displayed weak textures with low volume diffractions of preferred orientations in these mineral phases. Owing to the diffraction peak overlapping of different minerals, different texture components with fibre-like or biaxial-like characteristics were found in ash deposits.

Suggested Citation

  • Yongtie, Cai & Zhimin, Zheng & Guang, Zeng & Wen, Wen & Lei, Luo & Wenming, Yang, 2022. "Quantitative phase analysis and rietveld texture determination of minerals in ash deposits in a 11.2 MW moving grate boiler," Energy, Elsevier, vol. 255(C).
  • Handle: RePEc:eee:energy:v:255:y:2022:i:c:s0360544222014748
    DOI: 10.1016/j.energy.2022.124571
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    References listed on IDEAS

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    1. Cai, Yongtie & Tay, Kunlin & Zheng, Zhimin & Yang, Wenming & Wang, Hui & Zeng, Guang & Li, Zhiwang & Keng Boon, Siah & Subbaiah, Prabakaran, 2018. "Modeling of ash formation and deposition processes in coal and biomass fired boilers: A comprehensive review," Applied Energy, Elsevier, vol. 230(C), pages 1447-1544.
    2. Dario Fancello & Jessica Scalco & Daniela Medas & Elisa Rodeghero & Annalisa Martucci & Carlo Meneghini & Giovanni De Giudici, 2019. "XRD-Thermal Combined Analyses: An Approach to Evaluate the Potential of Phytoremediation, Phytomining, and Biochar Production," IJERPH, MDPI, vol. 16(11), pages 1-20, June.
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    2. Kalisz, Sylwester & Wejkowski, Robert & Maj, Izabella & Garbacz, Przemysław, 2023. "A novel approach to the dry desulfurization process by means of sodium bicarbonate: A full-scale study on SO2 emission and geochemistry of fly ash," Energy, Elsevier, vol. 279(C).

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