Patent ID: 6436161
Filing Date: 2002-08-20
Classification: B01D

Abstract:
A granular filtration apparatus for the removal of particulate material from hot gas by contacting said hot gas with granular filtration material, said apparatus being of the type having a filtration chamber containing granular filtration material and having a tapered lower portion comprising at least one inlet for feeding therein hot gases to be filtered and at least one outlet for drawing filtered hot gas,said granular filtration apparatus comprising a filtration unit mounted in the filtration chamber above each inlet, said filtration unit comprising: a first tubular member mounted above the inlet so as to prevent granular material from entering or blocking said inlet; a second tubular member having a bottom and a top end, said second tubular member being mounted essentially in a co-axial and spaced relationship above said first tubular member; whereby during operation, the granular filtration material is siphoned up and fluidized by the hot gases as they travel up the second tubular member, the granular filtration material enters the bottom end of the second tubular member through the space between the first and second tubular member, exits at the top end of the second tubular member and falls outside the second tubular member and towards the tapered lower portion of the filtration chamber to be eventually recirculated and fluidized by the hot gases.