Evaluation of attrition rate constants of char burning in fluidized beds by means of laboratory-scale combustors

Journal Article · Thu May 01 04:00:00 EDT 1986 · A.I.Ch.E. J.; (United States)

DOI:https://doi.org/10.1002/aic.690320520· OSTI ID:5490113

Arena, U; D'Amore, M; Massimilla, L; Meo, S; Miccio, M

Attrited carbon is a large fraction of the overall carbon elutriation from a fluidized coal combustor when gas velocity is significantly above the minimum for fluidization and feed size is coarser than 0.4 mm. Continuous fluidized combustion of a South African bituminous coal of particle size range varying between 0.4-1 and 6-9 mm in beds of sand fluidized at velocities between 0.8 and 1.6 m/s indicated that with the coal tested, the elutriation rate of attrited carbon fines (mostly <100 ..mu..m) was proportional to the surface of char exposed to the rubbing of bed solids. Experiments of fluidized combustion of the South African coal (1-3 mm size) have been repeated, with various excess air factors, using a miniature 40 mm ID and a pre-pilot 370 mm ID combustor. The layout of these units is similar to that of the 140 mm ID combustor with some exceptions.

• Research Organization: Istituto di Chimica Industriale e Impianti Chimici, Universita P .le V. Tecchio, 80125, Naples
• OSTI ID: 5490113
• Journal Information: A.I.Ch.E. J.; (United States), Journal Name: A.I.Ch.E. J.; (United States) Vol. 32:5; ISSN AICEA
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
014000* -- Coal
Lignite
&amp; Peat-- Combustion
BENCH-SCALE EXPERIMENTS
BITUMINOUS COAL
BLACK COAL
CARBON
CARBONACEOUS MATERIALS
CHARS
CHEMICAL REACTIONS
COAL
COMBUSTION
COMBUSTORS
ELEMENTS
ELUTRIATION
ENERGY SOURCES
EQUATIONS
EROSION
FLUID FLOW
FLUIDIZATION
FLUIDIZED-BED COMBUSTION
FLUIDIZED-BED COMBUSTORS
FOSSIL FUELS
FUELS
GAS FLOW
MATERIALS
NONMETALS
OXIDATION
PARTICLE SIZE
PYROLYSIS PRODUCTS
SEPARATION PROCESSES
SIZE
THERMOCHEMICAL PROCESSES