Particulate characterization. Final report for the period ending March 31, 1986. [Baghouse operating efficiency]
The primary focus is on characteristics which are critical to particulate control device performance and the environment for western low-rank coals. The concern is that the control device removal efficiency is reduced for particles less than 2..mu..m diameter and these fine particles represent a potential health hazard. Fly ash particle size distribution, morphology, composition, and ash cohesiveness were measured and related to the level of fine particle emissions from the baghouse and to the specific coal. A major finding of the study is that fine particulate emissions from a fabric filter are coal specific. That is, some coals produce fly ash which is easily collected while others produce fly ash with a smooth surface texture and low ash cohesiveness resulting in a difficult-to-collect ash. Tests were also conducted to determine the effect of micronizing the coal (mass median diameter approximately 10 ..mu..m) on the amount of respirable particulate matter produced. Results from combustion tests of two coals show that reduction in coal particle size reduces the median fly ash diameter and significantly increases submicron particle production. Trace element fly ash particle size studied for a micronized and a normal grind Texas lignite showed that selenium was the most highly enriched element in the submicron particles but there was also significant submicron enrichment of barium and vanadium for both coals. A method to reduce fine particulate emissions for difficult-to-collect ash was developed.
- Research Organization:
- North Dakota Univ., Grand Forks (USA). Energy and Mineral Research Center
- DOE Contract Number:
- FC21-83FE60181
- OSTI ID:
- 5438832
- Report Number(s):
- DOE/FE/60181-2089; ON: DE86014272
- Country of Publication:
- United States
- Language:
- English
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54 ENVIRONMENTAL SCIENCES
AEROSOL WASTES
AMMONIA
ASHES
BAGHOUSES
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL COMPOSITION
CHEMICAL PROPERTIES
COAL
EFFICIENCY
ENERGY SOURCES
EQUIPMENT
FABRIC FILTERS
FILTERS
FLY ASH
FOSSIL FUELS
FUELS
HAZARDS
HEALTH HAZARDS
HYDRIDES
HYDROGEN COMPOUNDS
INHALATION
INTAKE
MATERIALS
MORPHOLOGY
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
OXIDES
OXYGEN COMPOUNDS
PARTICLE SIZE
PARTICLES
PARTICULATES
PHYSICAL PROPERTIES
POLLUTION CONTROL EQUIPMENT
RESIDUES
RESPONSE MODIFYING FACTORS
SIZE
SULFUR COMPOUNDS
SULFUR OXIDES
SULFUR TRIOXIDE
WASTES