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Journal of Central South University of Technology

, Volume 15, Issue 6, pp 840–844 | Cite as

Slagging characteristics of molten coal ash on silicon-aluminum combustion liners of boiler

  • Jin-qiao He (何金桥)Email author
  • Zhang-ming Shi (时章明)
  • Dong-lin Chen (陈冬林)
  • Xian-liang Jiang (蒋显亮)
  • Xiao-zhong Yan (鄢晓忠)
Article

Abstract

In order to study the slagging characteristics of boiler combustion liners during pulverized coal stream combustion, the slag samples on the surface of combustion liner were investigated by X-ray diffractometry, scan electron microscopy and energy dispersive X-ray analysis, and the transformation characteristics of the compositions and crystal phases were studied. The results show that the size of slag granules decreases as the slagging temperature increases; the crystallinity of coal ash I reduces to about 48.6% when the temperature is increased up to 1 350 °C, and that of the coal ash II reduces to about 65% when the temperature is increased up to 1 500 °C; the encroachment of molten coal ash to the combustion liner is strengthened. At the same time, the diffusion and the segregation of the compositions in combustion liners have selectivity, which is in favor of enhancing the content of crystal phases, weakening the conglutination among molten slag compositions and combustion liner, and avoiding yielding big clinkers. But the diffusion of the compositions in combustion liners increases the porosity and decreases the mechanical intensity of combustion liner, and makes the slag encroachment to the liner become more serious.

Key words

pulverous coal ash slagging characteristics crystallinity combustion liner 

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Copyright information

© Central South University Press and Springer-Verlag GmbH 2008

Authors and Affiliations

  • Jin-qiao He (何金桥)
    • 1
    • 2
    Email author
  • Zhang-ming Shi (时章明)
    • 1
  • Dong-lin Chen (陈冬林)
    • 1
    • 2
  • Xian-liang Jiang (蒋显亮)
    • 3
  • Xiao-zhong Yan (鄢晓忠)
    • 2
  1. 1.School of Energy Science and EngineeringCentral South UniversityChangshaChina
  2. 2.Institute of Energy Source and Power EngineeringChangsha University of Science and TechnologyChangshaChina
  3. 3.School of Materials Science and EngineeringCentral South UniversityChangshaChina

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