Comparison of low-rank coal ash sintering characteristics with pilot plant ash fouling tendencies
Conference
·
OSTI ID:6530154
The objective of this work was to develop a simple laboratory test for evaluating the fouling tendencies of low-rank coal ashes. Simultaneous ash shrinkage-electrical resistance measurements were performed to determine the sinter points of various coal ashes. In addition, the compressive strength of sintered ash pellets was determined to give an indication of the apparent bonding strength. The factors studied include ash composition, ash time-temperature history and particle size. Sintering tests appeared, from this preliminary evaluation, to be a satisfactory bench-scale method for evaluating the fouling behavior of low-rank coals. These tests correlated well with the observed fouling behavior of coals in the UNDERC test furnace. There was a strong correlation between pilot plant ash fouling tendency and the amount of shrinkage observed and the compressive strength of ASTM and fly ash samples heated above their sinter points. In summary, the small amount of material required, the ability to use laboratory-produced ash rather than fly ash, and the low cost of the techniques are desirable characteristics for a test of fouling propensity. In addition, these techniques should prove useful in studies to clarify the mechanisms of particle-to-particle bonding involved in deposit formation. This together with information of the metal-ash bonding should help to both explain and predict fouling behavior of low-rank coal in combustion systems. 10 references, 9 figures, 5 tables.
- Research Organization:
- North Dakota Univ., Grand Forks (USA). Energy Research Center
- DOE Contract Number:
- FC21-83FE60181
- OSTI ID:
- 6530154
- Report Number(s):
- DOE/FE/60181-64; CONF-840729-1; ON: DE85000916
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
01 COAL, LIGNITE, AND PEAT
010600* -- Coal
Lignite
& Peat-- Properties & Composition
ADDITIVES
ASHES
BENCH-SCALE EXPERIMENTS
BOILERS
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
COAL
COAL RANK
COMBUSTION
COMPRESSION STRENGTH
CORRELATIONS
DEPOSITS
ENERGY SOURCES
FABRICATION
FOSSIL FUELS
FOULING
FUELS
MATERIALS
MECHANICAL PROPERTIES
OXIDATION
RESIDUES
SINTERING
TEST FACILITIES
THERMOCHEMICAL PROCESSES
010600* -- Coal
Lignite
& Peat-- Properties & Composition
ADDITIVES
ASHES
BENCH-SCALE EXPERIMENTS
BOILERS
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
COAL
COAL RANK
COMBUSTION
COMPRESSION STRENGTH
CORRELATIONS
DEPOSITS
ENERGY SOURCES
FABRICATION
FOSSIL FUELS
FOULING
FUELS
MATERIALS
MECHANICAL PROPERTIES
OXIDATION
RESIDUES
SINTERING
TEST FACILITIES
THERMOCHEMICAL PROCESSES