Influence of conversion to low NO{sub x} combustion on fly ash petrology and mineralogy: A case study

Book · Sun Dec 31 04:00:00 EST 1995

OSTI ID:257015

Robl, T L; Hower, J C; Graham, U M; Rathbone, R F ^[1]; Medina, S S ^[2]

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1. Univ. of Kentucky, Lexington, KY (United States). Center for Applied Energy Research
2. East Kentucky Power Cooperative, Winchester, KY (United States)

The wall-fired 116 MW unit 2 at the John Sherman Cooper Station, Pulaski County, Kentucky, was converted to low-NO{sub x} combustion in the winter of 1993--1994. The fly ash from before and after conversion was studied in detail. The coal feed, which did not change significantly over the study, was from southeastern Kentucky and had an ash range of 10--12% and a sulfur range of 1.5--1.9%. The coal rank was high volatile bituminous A with a vitrinite reflectance (R{sub max}) of about 0.8%. The coal had about 17% by volume inertinite macerals (mineral-free basis). The fly ash carbon can be divided into three types: anisotropic coke, isotropic coke and inertinite. The post-conversion fly ash has nearly twice the amount of carbon as the pre-conversion ash and shows an increase in anisotropic coke. Mullite and quartz were observed petrographically to be more abundant in the post-conversion fly ash, although only the mullite increase was confirmed by XRD. The proportion of glass is slightly less in the post-conversion ash and is accompanied by one-third drop in the amount of cenospheres.

• OSTI ID: 257015
• Report Number(s): CONF-950952--
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
20 FOSSIL-FUELED POWER PLANTS
AIR POLLUTION ABATEMENT
ASH CONTENT
BITUMINOUS COAL
BURNERS
COMPARATIVE EVALUATIONS
EXPERIMENTAL DATA
FLY ASH
FOSSIL-FUEL POWER PLANTS
MINERALOGY
NITROGEN OXIDES
PETROLOGY
RETROFITTING
SAMPLE PREPARATION
SULFUR CONTENT