Air filtration apparatus and method of operation thereof

摘要

Apparatus is described for the continuous removal of particulate matter from a gas stream using a filter medium. In the improved apparatus of this invention particulate laden air passes through a filter medium depositing the particulate on the solid members of the medium. Wash liquid is used to flush the particulate matter off of and/or through the filter for collection. The improved apparatus comprises a cleanable filter medium carried on a previous support, liquid supply means for providing wash liquid to clean the filter medium, motive means to cause relative motion between the support (and filter medium carried thereon) and the liquid supply means such that the wash liquid can impinge on a given portion of the filter medium from different directions over a period of time, and means for collecting and removing medium. Essentially all the particle laden water which is entrained in the gas stream is separated by use of mist eliminators or similar devices. The invention herein also includes a process for continuous gas filtration utilizing the described apparatus, wherein there is accomplished continuous in situ cleaning of the deposited particulate matter from the filter medium. The process is of especially utility for filtration of those gas systems wherein the velocity of the gas stream at the filter medium face is 300 to 4000 ft/min and the pressure drop across the filter medium is 7 to 60 inches of water.