Fundamental studies on mineral matter behavior in ash-agglomerating coal gasifiers

Conference · Mon Sep 01 04:00:00 EDT 1986

OSTI ID:6842218

Carty, R H; Mason, D M; Babu, S P

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
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010404* -- Coal
Lignite
& Peat-- Gasification
AGGLOMERATING ASH PROCESS
AGGLOMERATION
ASHES
ATMOSPHERIC PRESSURE
BENCH-SCALE EXPERIMENTS
BGC-LURGI SLAGGING PROCESS
CHALCOGENIDES
CHARS
CHEMICAL REACTORS
COAL GASIFICATION
DATA
DATA ANALYSIS
ELEMENTS
EXPERIMENTAL DATA
FLUIDIZED BEDS
GASIFICATION
INFORMATION
IRON COMPOUNDS
IRON SULFIDES
KRW GASIFICATION PROCESS
MINERALOGY
MINERALS
MOESSBAUER EFFECT
NONMETALS
NUMERICAL DATA
OXYGEN
PETROGRAPHY
PYRITE
PYROLYSIS PRODUCTS
RESIDUES
SLAGS
SULFIDE MINERALS
SULFIDES
SULFUR COMPOUNDS
TEMPERATURE EFFECTS
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
U-GAS PROCESS
VERY HIGH TEMPERATURE
VISCOSITY