Effect of residence time on feed utilization in a circulating fluidized bed boiler
- Air Products and Chemicals, Inc., Allentown, PA (United States)
A key operating parameter for circulating fluidized bed boilers is the bed quality, which is influences operating characteristics such as temperature control and feedstock utilization. In order to extend our understanding of feedstock utilization at our Stockton circulating fluidized bed boiler, the composition of fly ash and bottom ash was analyzed as a function of particle size. Results for two coal and limestone feeds demonstrate that carbon burnout and limestone conversion depend strongly on particle size. Some of the findings are contrary to general understanding. The authors of this paper observed that the majority of free carbon is found not in the bottom ash, but as a dilute constituent of the finer particles of fly ash. Furthermore, small limestone particles are less effective for sulfur capture, despite their high surface-to-volume ratio. These observations are reconciled by quantifying the relationship between particle size and particle residence time in the boiler. The residence time is shown to vary over four orders of magnitude, and is the controlling feature for feed utilization.
- OSTI ID:
- 5084203
- Report Number(s):
- CONF-9104106-; CODEN: PAPWA
- Journal Information:
- Proceedings of the American Power Conference; (United States), Vol. 53; Conference: 53. annual American power conference, Chicago, IL (United States), 29 Apr - 1 May 1991; ISSN 0097-2126
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
42 ENGINEERING
FLUIDIZED BED BOILERS
FUEL CONSUMPTION
OPERATION
FOSSIL-FUEL POWER PLANTS
ASHES
CIRCULATING SYSTEMS
LIMESTONE
PARTICLE SIZE
PARTICULATES
SULFUR
BOILERS
CARBONATE ROCKS
COMBUSTION PRODUCTS
ELEMENTS
ENERGY CONSUMPTION
NONMETALS
PARTICLES
POWER PLANTS
RESIDUES
ROCKS
SEDIMENTARY ROCKS
SIZE
THERMAL POWER PLANTS
200108* - Fossil-Fueled Power Plants- Fuels- (1980-)
420400 - Engineering- Heat Transfer & Fluid Flow