The cohesive properties of fly ash in electrostatic precipitation

Autor: D. Tidy, J. Dalmon
Rok vydání: 1972
Předmět:
Zdroj: Atmospheric Environment (1967). 6:81-92
ISSN: 0004-6981
DOI: 10.1016/0004-6981(72)90123-0
Popis: The cohesive properties and electrical resistivity of fly ash have been measured and an attempt made to relate them to the efficiency with which the ash is electrostatically precipitated. Cohesiveness was found to be of minor importance in the precipitation of a fine, highly resistive ash, where the resistivity was the most important factor. On the other hand, for a coarse, high carbon ash of low resistivity, a high cohesiveness was associated with a high collection efficiency and this was mainly due to an increased ability to capture the carbon fraction. It is concluded that the total cohesive force of an ash layer in an energized precipitator results partly from electrical forces due to the electric field and partly from a permanent component independent of the electric field. The permanent component is the same for a layer precipitated electrically and for a mechanically formed layer. The electrical and permanent components are of approximately equal magnitude when the ash is highly resistive but the permanent component dominates when the ash resistivity is low.
Databáze: OpenAIRE