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

Journal Article · Wed Apr 01 04:00:00 EST 1992 · Combustion and Flame; (United States)

DOI:https://doi.org/10.1016/0010-2180(92)90080-9· OSTI ID:5598445

Brown, R C; Ahrens, J; Christofides, N ^[1]

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1. Iowa State Univ., Dept. of Mechanical Engineering, Ames, IA (US)

This paper reports on the elutriation rates of unburned carbon from a 20-cm-i.d. bubbling fluidized bed that 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.

• OSTI ID: 5598445
• Journal Information: Combustion and Flame; (United States), Journal Name: Combustion and Flame; (United States) Vol. 89:1; ISSN CBFMA; ISSN 0010-2180
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
014000* -- Coal
Lignite
& Peat-- Combustion
ADSORBENTS
BUBBLES
CARBONACEOUS MATERIALS
CHARCOAL
CHEMICAL REACTIONS
COAL
COMBUSTION
CONCENTRATORS
CYCLONE SEPARATORS
ELUTRIATION
EMISSION
ENERGY SOURCES
EQUIPMENT
FLUIDIZED BEDS
FLUIDIZED-BED COMBUSTION
FOSSIL FUELS
FRAGMENTATION
FUELS
INERTIAL SEPARATORS
MATERIALS
OXIDATION
PARTICLES
PARTICULATES
POLLUTION CONTROL EQUIPMENT
SEPARATION EQUIPMENT
SEPARATION PROCESSES
THERMOCHEMICAL PROCESSES