Patent ID: 9669344
Date: 2017-06-06
CPC Classifications: B01D

Claim:
1. A hot gas filtration system comprising a filter vessel having an interior, a tubesheet separating the interior of the filter vessel into a clean gas section and a raw gas section, said filter vessel comprising at its raw gas section a raw gas inlet and at its clean gas section a clean gas outlet, a plurality of filter elements made of ceramic material or metal, and having a raw gas portion and a clean gas end, said plurality of filter elements being arranged in two or more separate groups of two or more filter elements, said filter elements being connected to the tubesheet with their clean gas ends and extending from the tube sheet with their raw gas portions into the raw gas section of the interior of said vessel, two or more separate plenum chambers accommodated in the clean gas section of the interior of the filter vessel, each separate plenum chamber accommodating the clean gas ends of the filter elements of a corresponding separate group of filter elements, each of said separate plenum chambers comprising a corresponding separate gas exchange opening providing a direct fluid communication of its interior with the clean gas section of the interior of the filter vessel, a blowback arrangement comprising a blowback gas reservoir, and a separate blowback gas pipe for each corresponding separate group of filter elements, the blowback arrangement delivering non-sonic jet pulses of blowback gas from the blowback gas reservoir via the separate blowback gas pipes into the separate plenum chambers via the corresponding separate gas exchange openings such that a volume of clean gas of the clean gas section is sucked into the separate plenum chambers, said separate blowback gas pipes each having a corresponding separate outlet positioned in said clean gas section of the vessel, said corresponding separate outlet of the separate blowback gas pipes being directed at the corresponding separate gas exchange opening of the separate plenum chambers, wherein said corresponding separate outlet of said corresponding separate blowback gas pipe is positioned flush with the upper end of the corresponding separate gas exchange opening of said separate plenum chamber, wherein a gap is present between each corresponding separate outlet of the corresponding separate blowback gas pipe and the upper end of the corresponding separate gas exchange opening of the separate plenum chamber, the gap allowing the non-sonic jet pulses of blowback gas from the blowback gas reservoir to pass via the separate blowback gas pipes into the separate plenum chambers via the corresponding separate gas exchange openings such that a volume of clean gas of the clean gas section is sucked into the separate plenum chambers, said corresponding separate outlet of said blowback pipe having a free cross-sectional area of from about 15% to about 50% of the free cross-sectional area of said corresponding separate gas exchange opening of said separate plenum chambers.