Study on Expansion of Circulating Fluidized Bed Combustion Coal Ash

Shun’ai He; Xiao Yan Zhu; Wen Zhong Bao; Wen Xin Zhao; Dong Min Jin

doi:10.4028/www.scientific.net/AMR.518-523.3501

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 518-523Study on Expansion of Circulating Fluidized Bed...

Study on Expansion of Circulating Fluidized Bed Combustion Coal Ash

Abstract:

Expansive hydration products of circulating fluidized bed combustion (CFBC) ash with different finesses are investigated in this paper. The results show that expansion occurred in hardened paste of CFBC ashes is mainly due to formation of dihydrate gypsum and ettringite. Besides, the free lime does indirectly cause expansion due to its effects on crystallization of ettringite. It also has been observed that linear free expansion rate of paste with ground CFBC ash is higher than that of paste using original ash at 1 day of hydration, but lower than paste with original ash 3 days and longer period of hydration later.

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Periodical:

Advanced Materials Research (Volumes 518-523)

Pages:

3501-3506

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.518-523.3501

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Online since:

May 2012

Authors:

Shun’ai He, Xiao Yan Zhu, Wen Zhong Bao, Wen Xin Zhao, Dong Min Jin

Keywords:

Coal Circulating Fluidized Bed Combustion (CFBC) Ash, Ettringite, Expansion

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References

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