Heat transfer from a molten phase to an immersed coal particle during devolatilization
- Sandia National Lab., Livermore, CA (United States)
- Carnegie Mellon Univ., Pittsburgh, PA (United States)
In several developmental and commercial processes, coal particles come into direct contact with a high-temperature molten phase. These processes include molten carbonate coal gasification and bath smelting for the production of iron. Recently, real-time X-ray fluoroscopic images have been published that show volatile matter evolving rapidly from coal particles immersed in molten phases, displacing the surrounding melt and producing a periodic cycle of formation, rise, and detachment of gas cavities. The present work makes use of these observations to develop a model of heat transfer from the melt to particles undergoing gas evolution. The model is developed for the general case and applied to predict melt-particle heat transfer coefficients under conditions relevant to bath smelting processes. The model shows that the presence of the gas film can actually increase the overall heat transfer rate under certain conditions. 32 refs., 10 figs., 1 tab.
- OSTI ID:
- 7048759
- Journal Information:
- Journal of Heat Transfer (Transactions of the ASME (American Society of Mechanical Engineers), Series C); (United States), Vol. 115:3; ISSN 0022-1481
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
42 ENGINEERING
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
COAL
DEVOLATILIZATION
HEAT TRANSFER
CARBONATES
FLUOROSCOPY
MATHEMATICAL MODELS
MOLTEN SALT COAL GASIFICATION PROCESS
SLAGS
SMELTING
BIOMEDICAL RADIOGRAPHY
CARBON COMPOUNDS
CARBONACEOUS MATERIALS
COAL GASIFICATION
DIAGNOSTIC TECHNIQUES
ENERGY SOURCES
ENERGY TRANSFER
FOSSIL FUELS
FUELS
GASIFICATION
MATERIALS
MEDICINE
NUCLEAR MEDICINE
OXYGEN COMPOUNDS
RADIOLOGY
THERMOCHEMICAL PROCESSES
010404* - Coal
Lignite
& Peat- Gasification
420400 - Engineering- Heat Transfer & Fluid Flow
990200 - Mathematics & Computers