Combustion Behavior of Single Pellets of Coal-Wood Mixtures in a Hot Gas Flow Field

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This experimental study explores the burning characteristics of single pellets made of wood and coal mixtures for co-firing. Three types of pellets were prepared with different wood-coal ratios (100:0, 80:20, and 50:50). Experiments were carried out in a laboratory reactor at rapid heating rates and under oxygen concentrations between 10 and 40%. To investigate their combustion behavior, single pellets were suspended on a wire injected into a hot gas stream at 1340 K and flame and char combustion were recorded through an observation window by means of a high-resolution (4K) camera. The sequential combustion time, volatile flame characteristics, and mass reduction rate were obtained over a time profile by carefully controlled particle injection. The results demonstrated that the char combustion time increased significantly in comparison to the volatile combustion time, which only varied a little, when the pellets contained coal in the mixture. Partially detached flames were also predominantly observed on pure biomass pellets at oxygen concentrations between 21 and 40%. During the homogeneous combustion period, the cross-sectional area of a pellet shrunk by 26.3-37.5% depending upon the type of pellet.
Publisher
AMER CHEMICAL SOC
Issue Date
2018-11
Language
English
Article Type
Article
Citation

ENERGY & FUELS, v.32, no.11, pp.11913 - 11923

ISSN
0887-0624
DOI
10.1021/acs.energyfuels.8b02557
URI
http://hdl.handle.net/10203/248707
Appears in Collection
ME-Journal Papers(저널논문)
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