Particle agglomeration and precipitation from a gaseous stream

Details Particle agglomeration and precipitation from a gaseous stream Particle agglomeration and precipitation from a gaseous stream

B - Operations, Transporting

01

D

B01D 51/02 (2006.01) B01D 50/00 (2006.01)

Patent

CA 2168486

The performance of a precipitator for separating liquid or solid particles suspended in a gaseous stream is improved when the particles are fine or ultra-fine, e.g. submicron, by treating the stream before it enters the precipitator to agglomerate the fine particles into larger ones. This result is achieved by passing the stream successively through a series of screens. Some particles entrained in the stream impact on solid portions of each screen, and become agglomerated in the process. Subsequently, a large portion of the agglomerated particles are re-entrained in the stream and pass to the precipitator. Since only a small percentage of the particles impacts each screen, a relatively large number of screens is normally preferred, e.g. at least 30. An improved form of precipitator employs pleated sheets to form the surfaces on which the particles are collected.

e rendement d'un précipitateur servant à séparer les particules liquides et solides dans un jet gazeux est amélioré lorsque les particules sont de dimension fine ou ultra-fine, c.-à-d. submicrométrique, en traitant le jet avant son arrivée dans le précipitateur pour agglomérer les particules fines en particules plus grosses. On obtient ce résultat en faisant passer le jet à travers une série de grilles. Certaines particules entraînées dans le jet heurtent la partie solide de chacune des grilles et s'agglomèrent. Par la suite une bonne partie des particules agglomérées sont entraînées de nouveau dans le jet et parvienne au précipitateur. Comme seulement une faible proportion des particules entrent en collision avec les grilles, il est normalement préférable d'utiliser un grand nombre de grilles, c.-à-d. au moins 30. Une forme améliorée de précipitateur fait appel à des feuillets plissés comme surface collectrice des particules.

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