Evaluation of attrition rate constants of char burning in fluidized beds by means of laboratory-scale combustors
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), Vol. 32:5
- Country of Publication:
- United States
- Language:
- English
Similar Records
Carbon attrition during the fluidized combustion and gasification of coal. Quarterly technical progress report, 1 December 1982-28 February 1983
Fluidized bed combustion of high-volatile solid fuels: An assessment of char attrition and volatile matter segregation
Related Subjects
BITUMINOUS COAL
FLUIDIZED-BED COMBUSTION
CHARS
BENCH-SCALE EXPERIMENTS
CARBON
ELUTRIATION
EQUATIONS
EROSION
FLUIDIZATION
FLUIDIZED-BED COMBUSTORS
GAS FLOW
PARTICLE SIZE
BLACK COAL
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
COAL
COMBUSTION
COMBUSTORS
ELEMENTS
ENERGY SOURCES
FLUID FLOW
FOSSIL FUELS
FUELS
MATERIALS
NONMETALS
OXIDATION
PYROLYSIS PRODUCTS
SEPARATION PROCESSES
SIZE
THERMOCHEMICAL PROCESSES
014000* - Coal
Lignite
& Peat- Combustion