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Particulate control highlights: research on electrostatic precipitator technology. Final report November 1976

Technical Report ·
OSTI ID:6982696
;
Highlights are given of a major EPA research program on electrostatic precipitator (ESP) technology, directed toward improving the performance of ESPs in controlling industrial particulate emissions, notably fly ash from coal combustion in electric power plants. Relationships between electrical effects, such as reverse corona, caused by high resistivity of the deposited fly ash, were investigated. The influence of fly ash particle size and chemical composition on the resistivity and dielectric strength of the deposited fly ash was also studied. Relationships were established between fly ash resistivity and chemical composition, especially its alkali metal content, for ESP operating temperatures below about 250/sup 0/C. Based on these relationships, a mechanism for ionic surface conduction is proposed that complements the ionic mechanism in bulk conduction in fly ash particles at higher operating temperatures. The efficacy of conditioning fly ash by adding SO/sub 3/ to flue gas (to lower fly ash resistivity) was established in trials at electric power plants. Reentrainment of particles from deposited fly ash was also investigated in relation to ESP rapping procedures and gas flow distribution. A mathematical model of the ESP process was developed, using fundamental relationships together with measurements of ESP geometry, electrical conditions, and particle size distribution.
Research Organization:
Southern Research Inst., Birmingham, AL (USA)
OSTI ID:
6982696
Report Number(s):
PB-276643; SORI-EAS-77-677
Country of Publication:
United States
Language:
English

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Related Subjects

20 FOSSIL-FUELED POWER PLANTS
200202* -- Fossil-Fueled Power Plants-- Waste Management-- Noxious Gas & Particulate Emissions
AEROSOL WASTES
AIR POLLUTION CONTROL
CARBONACEOUS MATERIALS
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
COAL
COMBUSTION
ELECTROSTATIC PRECIPITATORS
ENERGY SOURCES
EQUIPMENT
FLUE GAS
FLY ASH
FOSSIL FUELS
FOSSIL-FUEL POWER PLANTS
FUELS
GASEOUS WASTES
OXIDATION
PARTICLE SIZE
PERFORMANCE
POLLUTION CONTROL
POLLUTION CONTROL EQUIPMENT
POWER PLANTS
RESEARCH PROGRAMS
SIZE
THERMAL POWER PLANTS
THERMOCHEMICAL PROCESSES
WASTES