Coal gasification reactions with on-line in-situ FT-IR analysis. Sixth quarterly report, December 4, 1982-March 3, 1983

Technical Report · Thu Mar 31 04:00:00 EST 1983

OSTI ID:5314720

Solomon, P R; Hamblen, D G; Best, P E

During the sixth quarter, the reactor configuration was unchanged but the water-cooled collector is now being cleaned after each run to extract tar (and char) from the collector. This brings the material balance above 90% even for high tar coals. Data for a Beulah, North Dakota lignite were collected in the reactor system at a furnace temperature of 820/sup 0/C. The data suggests that some adjustment must be made to the tar rate or to the particle heating calculation at this temperature. Experiments will be performed at 650/sup 0/C to investigate this problem further. Programmed slow heating-rate experiments were performed for several coals. The use of slow heating in pyrolysis experiments provides data on individual reactions which often cannot be distinguished in rapid pyrolysis because they occur simultaneously. Slow heating conditions often resolve such reactions into separate gas evolution peaks. These peaks provide low temperature data for gas evolution kinetics. Work was performed on the pyrolysis theory. The computational details of the pyrolysis model have been modified in order to allow the simulations of multi-molecular kinetics. This was motivated by the need for more accurate modeling of tar and HCN production. The tar evolution rate is determined by (1) the availability of donatable hydrogen from alipathic or hydroaromatic hydrogen in the char, and (2) by the rate of bridge bond breaking. Similarly, the HCN gas production from the coal depends on both the rate of formation of CN radicals, and the availability of aromatic hydrogen to form HCN. Work continued on elucidating the mechanisms of particle swelling. The effects of gas diffusion through the coal metaplast and of surface tension are considered. The report also considers tar formation which is thought to be the result of a depolymerization process that releases fragments of the coal molecule. 32 figs., 18 tabs.

• Research Organization: Advanced Fuel Research, Inc., East Hartford, CT (USA)
• DOE Contract Number: AC21-81FE05122
• OSTI ID: 5314720
• Report Number(s): DOE/FE/05122-2111; ON: DE86014838
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010404* -- Coal
Lignite
& Peat-- Gasification
010406 -- Coal & Coal Products-- Pyrolysis & Cracking-- (-1987)
BITUMINOUS COAL
BLACK COAL
BROWN COAL
CARBONACEOUS MATERIALS
CHARS
CHEMICAL COMPOSITION
CHEMICAL REACTION KINETICS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
COAL
COAL GASIFICATION
COAL TAR
CYANIDES
DATA
DECOMPOSITION
ENERGY SOURCES
EXPERIMENTAL DATA
FLUIDS
FOSSIL FUELS
FUEL GAS
FUELS
GAS FUELS
GASES
GASIFICATION
HEATING RATE
HIGH TEMPERATURE
HYDROCYANIC ACID
HYDROGEN COMPOUNDS
INFORMATION
INORGANIC ACIDS
KINETICS
LIGNITE
MASS SPECTRA
MATERIALS
MATHEMATICAL MODELS
MOLECULAR WEIGHT
NUMERICAL DATA
ON-LINE MEASUREMENT SYSTEMS
ON-LINE SYSTEMS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PYROLYSIS
PYROLYSIS PRODUCTS
REACTION KINETICS
RESEARCH PROGRAMS
SPECTRA
SUBBITUMINOUS COAL
SWELLING
TAR
THERMOCHEMICAL PROCESSES
WATER
YIELDS