Heat transfer to horizontal tubes immersed in a fluidized-bed combustor
Experiments were carried out to measure the heat transfer rates to water-cooled horizontal tubes immersed in an atmospheric fluidized-bed combustor burning North Dakota lignite. The effect of bed temperature (T/sub BETA/ = 587-1205K), particle size (d/sub rho/ = 0.544-2,335 mm), and fluidizing velocity (U = 0.73-2.58 m/s) on heat transfer rate to horizontal tubes immersed in a fluidized-bed combustor (0.45 x 0.45 m) was investigated. Among existing correlations, correlations proposed by others are found to predict the present data quite well, when the contribution due to radiation is included. The radiative heat transfer is estimated as the difference between the heat transfer to an oxidized boiler tube and to a gold-plated tube. The relative contribution of radiation is found to be 11% for a bed of sand particles (d-bar/sub rho/ = 0.9 mm) operating at 1088K.
- OSTI ID:
- 5908440
- Report Number(s):
- CONF-861211-
- Country of Publication:
- United States
- Language:
- English
Similar Records
Heat transfer to horizontal tubes in a pilot-scale fluidized-bed combustor burning low-rank coals
Heat transfer to horizontal tubes in a pilot-scale fluidized-bed combustor burning low-rank coals
Related Subjects
014000* -- Coal
Lignite
& Peat-- Combustion
42 ENGINEERING
421000 -- Engineering-- Combustion Systems
BOILERS
BROWN COAL
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
COAL
COMBUSTION
COMBUSTORS
COOLING
CORRELATIONS
ENERGY SOURCES
ENERGY TRANSFER
FLOW RATE
FLUIDIZATION
FLUIDIZED BED BOILERS
FLUIDIZED BEDS
FLUIDIZED-BED COMBUSTION
FLUIDIZED-BED COMBUSTORS
FORECASTING
FOSSIL FUELS
FUELS
HEAT EXCHANGERS
HEAT FLOW
HEAT TRANSFER
HYDROGEN COMPOUNDS
LIGNITE
MATERIALS
OXIDATION
OXYGEN COMPOUNDS
RADIANT HEAT TRANSFER
SAND
TEMPERATURE MEASUREMENT
THERMOCHEMICAL PROCESSES
THERMODYNAMICS
TUBES
VERY HIGH TEMPERATURE
WATER