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The contributions of attrition and fragmentation to char elutriation from fluidized beds

โœ Scribed by Robert C. Brown; Jeffrey Ahrens; Nearchos Christofides

Publisher
Elsevier Science
Year
1992
Tongue
English
Weight
529 KB
Volume
89
Category
Article
ISSN
0010-2180

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โœฆ Synopsis

The elutriation rates of unburned carbon from a 20-cm-i.d. bubbling fluidized bed were evaluated for a variety of coals. Elutriation rates were determined from cyclone catches while carbon loadings in the fluidized bed were evaluated from transient gas and particle emissions. The elutriation rates were well correlated with carbon loading in the bed, but there was no evidence that they depend on superficial velocity through the bed. These results suggest that fragmentation, rather than attrition, is primarily responsible for carbon loss during fluidized bed combustion. The experiments found evidence that the fragmentation rates were dependent on coal rank.

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โœ Peter M. Walsh; Tong Li ๐Ÿ“‚ Article ๐Ÿ“… 1994 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 655 KB

Yields of small char particles, formed from larger particles by attrition and fragmentation during combustion, were measured at temperatures characteristic of fluidized bed combustors. The small particles were generated by burning char in a furnace on a vibrating screen. Particles passing through 1.