Abstract
Dust build-up on adjacent surfaces is often an unwanted effect in industrial processes handling pulverized materials. In the case of electrostatic precipitation, build-up of dust on the collecting surface is the purpose of the process. Removal of this build-up is sometimes difficult, but necessary to maintain the continuity of the process. Dry-process methods for dust removal include rapping by impact. It is the intent of this paper to provide information on the general subject of dust removal from plates, on rapping systems used in electrostatic precipitators, and on measurements and order of magnitude of rapping forces. Rapping acceleration test results obtained in the laboratory are expanded to cover full-scale collecting surface plates. Effects of plate design, plate height and length, method of support, rapping, hammer weight, and lift are analyzed.
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