Method and plant for the conveyance of fine-grained solids

US7878156B2 · kind B2 · utility

Assignee

• Outotec Oyj · FI

Inventors

• Jochen Freytag · Usingen, DE
• Martin Hirsch · Friedrichsdorf, DE
• Michael Ströder · Neu-Anspach, DE

Key dates

• Filing date: Dec 12, 2003
• Grant date: Feb 1, 2011
• Expiry date: Dec 12, 2023

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C22B1/10
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The present invention relates to a method for the conveyance of fine-grained solids in a fluidized bed reactor and also to a corresponding plant. It is proposed to introduce a first gas or gas mixture from below through a central tube (3) into a mixing chamber (7) of the reactor (1), the central tube (3) being at least partly surrounded by a stationary annular fluidized bed (10) which is fluidized by supplying fluidizing gas. The gas velocities of the first gas or gas mixture as well as of the fluidizing gas for the annular fluidized bed (10) are adjusted such that the particle Froude numbers in the central tube (3) are between 1 and 100, in the annular fluidizied bed (10) between 0.02 and 2 in the mixing chamber (7) between 0.3 and 30.