Experimental Study on Microstructure of Fly-Ash from Circulating Fluidized Bed Boilers

Yan Jin; Cui Ying Feng; Juan Juan Liu

doi:10.4028/www.scientific.net/AMR.354-355.413

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 354-355Experimental Study on Microstructure of Fly-Ash...

Experimental Study on Microstructure of Fly-Ash from Circulating Fluidized Bed Boilers

Abstract:

Circulating fluidized bed (CFB) combustion techniques have been widely used in China. In order to improve CFB boiler performance it is necessary to study on microstructures of fly-ash. With the help of nitrogen adsorption instrument and scanning electron microscopy, the pore structure of fly-ash in circulating fluidized bed boilers are studied by nitrogen adsorption/desorption isotherms of fly-ash, hysteresis loop and pore distribution. The results indicated that different particle sizes of fly-ash in CFB boilers are of similar nitrogen adsorption isotherms, pore types and the pore size distribution, and the most probable pore radius of fly-ash is about 2nm. Adsorption isotherms of fly-ash is the second type, and the macro-porous and meso-porous types are tapered hole, parallel plate slit hole and the ink bottle shape hole. And meso-pore in proportion is the largest. Micro-pores are not discovered in fly-ash from CFB boilers.

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Periodical:

Advanced Materials Research (Volumes 354-355)

Pages:

413-416

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.354-355.413

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Online since:

October 2011

Authors:

Yan Jin, Cui Ying Feng, Juan Juan Liu

Keywords:

Circulating Fluidized Bed Boiler, Fly Ash (FA), Microstructure, Nitrogen Adsorption

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