Heat transfer to horizontal tubes in a pilot-scale fluidized-bed combustor burning low-rank coals

Technical Report · Sat Jan 01 04:00:00 EST 1983

OSTI ID:6191899

Grewal, N S; Goblirsch, G

Experimental data are obtained for the heat transfer coefficient between immersed horizontal tube bundles and an atmospheric-fluidized-bed combustor burning low-rank coals. Silica sand (d/sub p/ = 888 to 1484 ..mu..m) and limestone (d/sub p/ = 716 to 1895 ..mu..m) are used as bed material. The tests are conducted, with and without limestone addition and ash recycle, at average bed temperatures ranging from 1047 to 1125/sup 0/K, superficial fluidizing velocity of 1.66 to 2.04 m/s, and excess air levels of 15 to 40 percent. The experimental data are examined in the light of the existing correlations for the heat transfer coefficient. The predicted values of heat transfer coefficient from the correlations proposed by Grewal (1981) and Bansal et al. (1980) are found to be within +-25 percent of the experimental values of heat transfer coefficient, when the contribution due to radiation is also included. 5 figures, 5 tables.

• Research Organization: North Dakota Univ., Grand Forks (USA). Dept. of Mechanical Engineering; USDOE Grand Forks Energy Technology Center, ND
• DOE Contract Number: FC01-83FE60181
• OSTI ID: 6191899
• Report Number(s): DOE/FE/60181-16; CONF-830702-19; ON: DE83013246
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
014000* -- Coal
Lignite
& Peat-- Combustion
CARBONACEOUS MATERIALS
CARBONATE ROCKS
CHALCOGENIDES
CHEMICAL REACTIONS
COAL
COMBUSTION
COMBUSTORS
DATA
DIAGRAMS
ENERGY SOURCES
ENERGY TRANSFER
EXPERIMENTAL DATA
FLOWSHEETS
FLUIDIZED-BED COMBUSTION
FLUIDIZED-BED COMBUSTORS
FOSSIL FUELS
FUELS
HEAT TRANSFER
INFORMATION
LIMESTONE
MATERIALS
MINERALS
NUMERICAL DATA
OXIDATION
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
ROCKS
SAND
SEDIMENTARY ROCKS
SILICA
SILICON COMPOUNDS
SILICON OXIDES
THERMOCHEMICAL PROCESSES
TUBES
VERY HIGH TEMPERATURE