Investigation of vaporization and devolatilization of coal/water mixtures. Seventh quarterly report, November 1, 1983-January 31, 1984
The objective of this program is to develop the capabilities to predict the vaporization and devolatilization behavior of coal/water mixtures under conditions appropriate for spray combustion. The program is currently collecting data in an entrained flow coal reactor which has a fixed position, coal/water slurry spray injector and a movable product extractor. This reactor is being used to study the vaporization and pyrolysis of coal/water slurries. FT-IR is used for the analysis of the product gases, tars and chars to determine species evolution kinetics and kinetics of secondary reactions such as steam-char reactions, cracking, soot formation, char gasification, cenosphere formation and particle swelling, and char reactivity. Pyrolysis data for ARC prepared coal/water slurries were collected in the reactor system at furnace temperatures between 900 and 1500/sup 0/C. The major physical effect of the water when slurry droplets are studied is agglomeration of coal particles to produce large char particles. The agglomeration appears to increase with increasing temperature but can be controlled under some conditions by using a coal which has reduced swelling behavior. There is evidence suggesting that the large agglomerates which have been observed are produced by collisions within the transfer tube through which the droplets enter the furnace. FT-IR techniques are being used to measure particle temperatures during pyrolysis and combustion. Measurements were made of char particle temperatures at several oxygen concentrations in the secondary gas. Measurements were also made to compare particle temperatures with and without water. The primary effect of the water appears to be to disburse the particles better, leading to higher heating rates. 1 reference, 15 figures.
- Research Organization:
- Advanced Fuel Research, Inc., East Hartford, CT (USA)
- DOE Contract Number:
- AC22-82PC50254
- OSTI ID:
- 6777366
- Report Number(s):
- DOE/PC/50254-T7; ON: DE84013179
- Resource Relation:
- Other Information: Portions are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CHARS
INFRARED SPECTRA
PARTICLE SIZE
COAL TAR
FUEL SLURRIES
DEVOLATILIZATION
EVAPORATION
TEMPERATURE MEASUREMENT
PYROLYTIC GASES
COAL
COMBUSTION
DISTRIBUTION
ELECTRON MICROSCOPY
FOURIER TRANSFORMATION
MIXTURES
SPRAYS
WATER
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
DISPERSIONS
ENERGY SOURCES
FLUIDS
FOSSIL FUELS
FUELS
GASES
HYDROGEN COMPOUNDS
INTEGRAL TRANSFORMATIONS
MATERIALS
MICROSCOPY
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
OXIDATION
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PYROLYSIS PRODUCTS
SIZE
SLURRIES
SPECTRA
SUSPENSIONS
TAR
THERMOCHEMICAL PROCESSES
TRANSFORMATIONS
014000* - Coal
Lignite
& Peat- Combustion
013000 - Coal
Lignite
& Peat- Transport
Handling
& Storage