Fundamental studies on mineral matter behavior in ash-agglomerating coal gasifiers
The Institute of Gas Technology is conducting a research program on ash chemistry to predict the behavior of the mineral matter in a fluidized-bed gasifier and its downstream units based on a minimum analysis of the characteristics of the mineral matter present in the coal feed and on the operating conditions. The bench-scale fundamental research investigation on the behavior of mineral matter, contained in chars from Pittsburgh Seam Coal from the Consolidation Coal Company's Ireland Mine in Marshall County, West Virginia, and from the No. 11 seam of Kentucky coal, were conducted in a 2-inch ID gasifier with a perforated plate gas distributor at atmospheric pressure, at 1255 and 1366 K, with char carbon conversions ranging from 24% to 94%. Some of the tests were conducted with low oxygen, 0.31 to 0.32 mole percent in the feed gas and others with 5.0 to 5.7 mole percent oxygen to investigate the effect of temperature due to the reaction of oxygen with the char. Feed chars ad char residues obtained from the 2-inch-ID batch gasification tests were analyzed chemically and by Moessbauer spectroscopy and were examined by optical petrography. The data analysis indicate that, during gasification the pyrite decomposes to ferrous sulfide and, at times, a minor amount of metallic iron. The ferrous sulfide in the interior of the char particles remains stable until exposed by burn-off of the char. As gasification proceeds, some of the iron compounds react with clays and silica to form low-melting ferrous alumino-silicates. In the tests without the center jet, roughly 30% of the iron became silicate, mostly in poorly defined forms. In pilot plant runs, the ferrous aluminosilicate serves as the agglutinating agent, embedding other ash particles and forming nearly spherical and dense agglomerates that selectively drop out of the fluidized gasification zone. 3 refs, 6 figs., 4 tabs.
- Research Organization:
- Institute of Gas Technology, Chicago, IL (USA)
- DOE Contract Number:
- AC21-84MC21313
- OSTI ID:
- 6842218
- Report Number(s):
- CONF-860948-5; ON: DE87003955
- Resource Relation:
- Conference: 3. annual Pittsburgh coal conference, Pittsburgh, PA, USA, 8 Sep 1986; Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Mineral matter behavior in high carbon conversion coal gasifiers
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Related Subjects
ASHES
AGGLOMERATION
CHARS
MINERALOGY
PETROGRAPHY
COAL GASIFICATION
FLUIDIZED BEDS
SLAGS
VISCOSITY
AGGLOMERATING ASH PROCESS
ATMOSPHERIC PRESSURE
BENCH-SCALE EXPERIMENTS
BGC-LURGI SLAGGING PROCESS
CHEMICAL REACTORS
DATA ANALYSIS
EXPERIMENTAL DATA
IRON SULFIDES
KRW GASIFICATION PROCESS
MOESSBAUER EFFECT
OXYGEN
PYRITE
TEMPERATURE EFFECTS
U-GAS PROCESS
VERY HIGH TEMPERATURE
CHALCOGENIDES
DATA
ELEMENTS
GASIFICATION
INFORMATION
IRON COMPOUNDS
MINERALS
NONMETALS
NUMERICAL DATA
PYROLYSIS PRODUCTS
RESIDUES
SULFIDE MINERALS
SULFIDES
SULFUR COMPOUNDS
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
010404* - Coal
Lignite
& Peat- Gasification