Bench-scale combustion characterization of cleaned Kentucky No. 9 coals: Final report

Technical Report · Sun Feb 01 04:00:00 EST 1987

OSTI ID:6825815

Smouse, S M

Many previous studies have attempted to quantify the effects of coal quality on power plant performance to justify use of cleaned coal. These studies indicated that the use of cleaned coal can improve reliability, increase availability, and reduce maintenance costs. However, the cost/benefit advantages of cleaned coals have not been clearly demonstrated to utilities. The Electric Power Research Institute has launched a program to evaluate the effects of coal quality on power plant performance. This project was designed to study combustion characteristics of raw and cleaned coals. To evaluate and demonstrate the relative merits of clean coal versus raw coal to electric utilities, it is necessary to test and compare the properties and characteristics of both types of coals. The areas of major interest include grindability and abrasion behavior, ignitability and combustion efficiency, slagging and fouling potential, sulfur and nitrogen oxides emission potential, and fly ash collection efficiency. The properties and characteristics of two levels (medium and deep) of cleaned Kentucky No. 9 coal were tested and compared to those of the raw coal. The cleaned coals were prepared at EPRI's Coal Cleaning Test Facility (CCTF) at Homer City, Pa. The test results indicate that certain advantages, in addition to reducing sulfur oxides emissions, can be attained by coal cleaning. Use of cleaned Kentucky No. 9 coals in existing units will allow the following improvements to be realized: increased pulverizer grinding element lives, reduced pulverized-coal and fly ash erosion, and reduced particulate emissions potential. It appears that there are significant advantages in using the cleaned Kentucky No. 9 coals. However, other cleaned coals may not show similar advantages, and the costs/benefits of using cleaned coals must be assessed on an individual basis. 15 refs., 5 figs., 14 tabs.

• Research Organization: Babcock and Wilcox Co., Alliance, OH (USA). Research and Development Div.; Electric Power Research Inst., Palo Alto, CA (USA)
• OSTI ID: 6825815
• Report Number(s): EPRI-CS-5070; ON: TI87920277
• Country of Publication: United States
• Language: English

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AEROSOL WASTES
AIR POLLUTION ABATEMENT
ASHES
BENCH-SCALE EXPERIMENTS
BOILERS
CALORIFIC VALUE
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
CHEMICAL STATE
CLEANING
COAL
COAL PREPARATION
COMBUSTION
COMBUSTION PROPERTIES
COST BENEFIT ANALYSIS
DEPOSITION
ELEMENTS
EMISSION
ENERGY SOURCES
EROSION
FLY ASH
FOSSIL FUELS
FOSSIL-FUEL POWER PLANTS
FOULING
FUELS
GRINDING MACHINES
MACHINE TOOLS
MANAGEMENT
MATERIALS
MELTING
NONMETALS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PARTICLES
PARTICULATES
PHASE TRANSFORMATIONS
POLLUTION ABATEMENT
POWER PLANTS
PROCESSING
RECOMMENDATIONS
RESIDUES
SERVICE LIFE
SLAGGING PYROLYSIS PROCESS
SLAGS
SULFUR
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
TEMPERATURE DEPENDENCE
TEST FACILITIES
THERMAL POWER PLANTS
THERMOCHEMICAL PROCESSES
TOOLS
VISCOSITY
WASTE MANAGEMENT
WASTE PROCESSING
WASTES