Coal and ash blend analysis of a bituminous and a subbituminous coal. [MS thesis; 131 references]
Coal blending is a readily available and very economical means of improving the quality of coals for combustion. With blending, Midwestern coals can be used to burn low BTU Western subbituminous coals efficiently and this can eliminate, or reduce the need for, flue gas desulfurizaton systems. Blending allows coal heating values to be more closely controlled and avoids the effects of major fluctuations in heat generation. Experience has shown that regulation of the BTU value will cause all other coal specifications to fall within designated limits. These specifications include: minimum heating value, maximum volatile matter, maximum ash, maximum moisture, maximum alkalis, maximum grindability, and minimum ash fusion temperatures. Blending will offer other benefits to coal-fired power generating plants. The capital cost of boilers can be reduced if variations in the fuel properties can be reduced. If the heating value is kept constant, the required boiler size will be better estimated and can be smaller. Boiler slagging and fouling could be reduced if coals of uniform heating value are used. To be successful, blending requires a careful selection of coals. This study has been undertaken in an attempt to derive better blending principles to provide maximum heating with minimum emissions, fouling, and slagging. The properties of a Western subbituminous coal and a Midwestern bituminous coal are studied in detail. The coals are then blended in selected proportions and their mineral contents studied in detail. Finally, fusion behavior of the blends is observed and the ash components identified. In this way combustion problems which could result from a carbon or random selection of coals to be blended can be minimized.
- Research Organization:
- Ames Lab., Ames, IA (United States)
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 6556370
- Report Number(s):
- DOE/TIC-11440
- Resource Relation:
- Other Information: Thesis
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BOILERS
FOULING
COAL
COMBUSTION
MIXING
ASHES
BITUMINOUS COAL
CHEMICAL COMPOSITION
COAL PREPARATION
ELEMENTS
MINERALS
QUANTITY RATIO
SLAGS
SUBBITUMINOUS COAL
SULFUR
SULFUR OXIDES
TRACE AMOUNTS
X-RAY DIFFRACTION
BLACK COAL
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL REACTIONS
COHERENT SCATTERING
COMMINUTION
DIFFRACTION
ENERGY SOURCES
FOSSIL FUELS
FUELS
MATERIALS
NONMETALS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
RESIDUES
SCATTERING
SULFUR COMPOUNDS
THERMOCHEMICAL PROCESSES
014000* - Coal
Lignite
& Peat- Combustion