Method and device for introducing fine particle-shaped material into the fluidised bed of a fluidised bed reduction unit

摘要

A method for introducing fine particulate material (4) of ferruginous particles into a fluidized bed reduction unit (1) having a fluidized bed (24), wherein the temperature in the fluidized bed (24) is more than 300° C., and wherein the fine particulate material (4) is introduced directly into the fluidized bed (24) and/or into a free space (25) above the fluidized bed (24) by means of a burner (2). The method may be used for producing liquid pig iron (17) or liquid steel precursor products (18) by a smelting reduction process in a smelting reduction unit (22).

主权项

1. A method for introducing a fine particulate material comprising iron-oxide-containing particles into a reduction unit for reducing the iron-oxide-containing particles by an externally supplied reduction gas wherein the reduction unit is a fluidized bed reduction unit having a fluidized bed;
the method comprising: providing a temperature in the fluidized bed below a melting temperature of the fine particulate material, wherein the temperature is more than 300° C. and less than 900° C.; melting exterior surfaces of particles of the fine particulate material by using flame issuing from a burner to form the fine particulate material into agglomerates while introducing the fine particulate material directly into the fluidized bed and/or into a free space above the fluidized bed by use of a burner; holding the agglomerates in suspension by causing the reduction gas to flow upward through the fluidized bed reduction unit for reducing the iron-oxide-containing particles contained in the agglomerates by means of the reduction gas, and removing the agglomerates from the fluidized bed reduction unit after the reduction of the iron-oxide-containing particles contained in the agglomerates.