Mineral matter behavior in high carbon conversion coal gasifiers

Conference · Tue Jan 01 04:00:00 EST 1985

OSTI ID:6026008

Mason, D M; Carty, R H; Babu, S P; Ghate, M R; Lai, H Y

Investigations of ash agglomerates formation in high carbon conversion fluidized bed gasifiers showed that pyrite in coal is decomposed to FeS and oxidized to FeO and Fe/sub 3/O/sub 4/, which in turn react with clay minerals to form a low-melting ferrous aluminosilicate. This serves as the agglutinating agent, embedding other ash particles, and forming nearly spherical and dense agglomerates that selectively drop out of the fluidized bed gasification zone. Experimental results from gasification of Pittsburgh seam and Kentucky No. 11 coal chars show the progressive variation in the forms of iron compounds with increasing carbon conversion. The viscosity of a slag similar in composition to the agglomerates is measured by a needle-penetrometer viscometer, to be about 2700 Pa.s. Slagging behavior in fixed-bed gasifiers is closely related to the ash fusion point, slag viscosity, and mineral matter composition in coals, as well as the operating conditions. the viscosity of a particular iron-containing slag at a fixed temperature will be dependent on the oxidation state of the iron. The dependence of slag viscosity on mineral matter composition, and the oxidation state of iron is discussed. 7 refs., 3 figs.

• Research Organization: Institute of Gas Technology, Chicago, IL (USA); USDOE Morgantown Energy Technology Center, WV
• DOE Contract Number: AC21-82MC19301
• OSTI ID: 6026008
• Report Number(s): CONF-851003-18; ON: DE86007262
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010404* -- Coal
Lignite
& Peat-- Gasification
AGGLOMERATION
ASHES
CHALCOGENIDES
CHARS
CHEMICAL REACTORS
COAL GASIFICATION
DATA
EXPERIMENTAL DATA
FLUIDIZED BEDS
GASIFICATION
INFORMATION
IRON COMPOUNDS
IRON SULFIDES
MINERALS
NUMERICAL DATA
PYRITE
PYROLYSIS PRODUCTS
RESIDUES
SLAGS
SULFIDE MINERALS
SULFIDES
SULFUR COMPOUNDS
TEMPERATURE DEPENDENCE
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
VERY HIGH TEMPERATURE
VISCOSITY