Patent ID: 7244399
Filing Date: 2007-07-17
Classification: B01J,F23C

Abstract:
1. A grid construction for a fluidized bed reactor, the reactor including a reaction chamber defined by substantially vertical walls, in which a fluidized bed of solid particles is maintained, and a windbox under the reaction chamber, in a lower portion of the reactor, said grid construction being positioned between the reaction chamber and the windbox and comprising: at least one discharge duct for withdrawing coarse material from the reaction chamber; multiple nozzle lines having a continuous structure providing two smooth side faces and a smooth top surface for distributing fluidizing gas from the windbox into the reaction chamber and for suspending the fluidized bed of solid particles in the reaction chamber; and continuous elongated trenches between the side faces of said nozzle lines, wherein said nozzle lines comprise multiple gas outlets at the side faces of said nozzle lines for directing fluidizing gas jets towards an adjacent trench, and wherein the multiple gas outlets have at each side face a common gas flow direction, which forms in a horizontal plane an angle from about twenty degrees to about seventy degrees with the normal of the direction of an adjacent trench so as to direct solid material along the trench towards one of the at least one discharge duct.