Patent ID: 6915751
Filing Date: 2005-07-12
Classification: B01J,F26B

Abstract:
1. A method of processing a layer of pulverulent or particulate material which is fluidized on a bed plate of a fluid bed apparatus by means of fluidizing gas which is introduced through openings in the bed plate in a first plurality of streams or flows of gas, said fluid bed apparatus comprising a housing having a polygonal shape and comprising a number of walls and a ceiling, said method further comprising a reduction of detrimental effects in particular deposition of products, condensation and corrosion, on the surfaces of said walls and ceiling, wherein a second plurality of streams or flows of gas is introduced into said housing at a site or sites of introduction and is directed from said site or sites along the surfaces of at least some of the walls of the housing to form a gas barrier covering at least a substantial part of said wall surfaces above said bed plate and the ceiling of the housing, the temperature of said second plurality of streams or flows of gas being higher than the temperature of the layer of material.