Patent ID: 7878156
Filing Date: 2011-02-01
Classification: B01J,C04B,C22B,F28C

Abstract:
1. A method for the conveyance of fine-grained solids in a fluidized bed reactor, comprising: introducing a first gas or gas mixture from below through a gas supply tube into a mixing chamber of the reactor such that the gas flowing through the gas supply tube entrains solids from a stationary annular fluidized bed that at least partly surrounds the gas supply tube, wherein the bed height of the solids in the reactor are adjusted such that the annular fluidized bed extends beyond an upper orifice end of the gas supply tube and that solids are constantly introduced into the first gas or gas mixture and entrained by the gas stream to the mixing chamber located above the orifice region of the gas supply tube; fluidizing the annular fluidized bed by supplying a fluidizing gas; and conveying the solids entrained in the gas out of the reactor by adjusting the gas velocities of the first gas or gas mixture as well as of the fluidizing gas for the annular fluidized bed such that the particle Froude numbers in the gas supply tube are between 1 and 100, in the annular fluidized bed between 0.02 and 2 and in the mixing chamber between 0.3 and 30.