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Slagging and Fouling Characteristics of HRSG for Ferrosilicon Electric Furnaces

Author

Listed:
  • Yungang Wang

    (Key Laboratory of Thermo-Fluid Science and Engineering (Ministry of Education), Xi'an Jiaotong University, Xi'an 710049, Shaanxi, China)

  • Heng Chen

    (Key Laboratory of Thermo-Fluid Science and Engineering (Ministry of Education), Xi'an Jiaotong University, Xi'an 710049, Shaanxi, China)

  • Zhongya Chen

    (Key Laboratory of Thermo-Fluid Science and Engineering (Ministry of Education), Xi'an Jiaotong University, Xi'an 710049, Shaanxi, China)

  • Haidong Ma

    (Key Laboratory of Thermo-Fluid Science and Engineering (Ministry of Education), Xi'an Jiaotong University, Xi'an 710049, Shaanxi, China)

  • Qinxin Zhao

    (Key Laboratory of Thermo-Fluid Science and Engineering (Ministry of Education), Xi'an Jiaotong University, Xi'an 710049, Shaanxi, China)

Abstract

The slagging and fouling characteristics of the heat recovery steam generator (HRSG) for ferrosilicon electric furnaces are discussed in this paper. Three ash samples were taken from the HRSG of a ferrosilicon furnace in Ningxia Province, China, which suffered from serious slagging and fouling. X-ray fluorescence (XRF), X-ray powder diffraction (XRD) and scanning electron microscope (SEM) were used to analyze the ash samples. The results show that low melting point salt Na 2 SO 4 and composite salts Na (AlSi 3 O 8 ) and 3K 2 SO 4 ·CaSO 4 deposit on the superheater tube walls in aerosol form and solidify to form the initial slag layer. With the continuous deposition of the low melting point compounds, more and more ash particles in the flue gas adhere to the slag surface to form a thicker slag. Low melting point composite salt NaO·Al 2 O 3 ·SiO 2 is absorbed on the evaporator tube walls in aerosol form. With the deposition of NaO·Al 2 O 3 ·SiO 2 , more and more ash particles are absorbed to form the fouling. Since there is less space between pin-finned tubes, the large iron-rich slag particles are easily deposited on tube walls and fin surfaces, which is advantageous to the fouling process. There are large quantities of superfine ash particles in the flue gas that easily adhere to other particles or tube walls, which facilitates the slagging and fouling process.

Suggested Citation

  • Yungang Wang & Heng Chen & Zhongya Chen & Haidong Ma & Qinxin Zhao, 2015. "Slagging and Fouling Characteristics of HRSG for Ferrosilicon Electric Furnaces," Energies, MDPI, vol. 8(2), pages 1-13, February.
  • Handle: RePEc:gam:jeners:v:8:y:2015:i:2:p:1101-1113:d:45365
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    Cited by:

    1. Davide Basso & Carlo Cravero & Andrea P. Reverberi & Bruno Fabiano, 2015. "CFD Analysis of Regenerative Chambers for Energy Efficiency Improvement in Glass Production Plants," Energies, MDPI, vol. 8(8), pages 1-17, August.

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