Heat transfer to horizontal tubes immersed in a fluidized-bed combustor

Conference · Sun Jun 01 04:00:00 EDT 1986

OSTI ID:5269618

Grewal, N S; Menart, J; Hajicek, D R; Zobeck, B J

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 B/ = 587 to 1205K), particle size (anti d/sub p/ = 0.544 to 2.335 mm), and fluidizing velocity (U = 0.73 to 2.58 m/s) on the 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 Glicksman and Decker (1980), Zabrodsky et al. (1980), Catipovic et al. (1980), Grewal (1981), and Bansal et al. (1980) 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 (anti d/sub p/ = 0.9 mm) operating at 1088K. 40 refs., 7 figs., 5 tabs.

• Research Organization: North Dakota Univ., Grand Forks (USA)
• DOE Contract Number: FC21-83FE60181
• OSTI ID: 5269618
• Report Number(s): DOE/FE/60181-152; CONF-861103-2; ON: DE86012366
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
014000* -- Coal
Lignite
& Peat-- Combustion
42 ENGINEERING
420400 -- Engineering-- Heat Transfer & Fluid Flow
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
COAL
COMBUSTION
COMBUSTORS
COMPARATIVE EVALUATIONS
CONFIGURATION
CORRELATIONS
DATA
ENERGY SOURCES
ENERGY TRANSFER
EXPERIMENTAL DATA
FLUIDIZED-BED COMBUSTION
FLUIDIZED-BED COMBUSTORS
FOSSIL FUELS
FUELS
HEAT TRANSFER
INFORMATION
MATERIALS
NUMERICAL DATA
OXIDATION
RADIANT HEAT TRANSFER
TEMPERATURE DEPENDENCE
THERMOCHEMICAL PROCESSES
TUBES