US 8,986,421 B2Granted

Method of controlling the thermal balance of the reaction shaft of a suspension smelting furnace and a concentrate burner

AssigneeOutotec Oyj

InventorsJussi Sipilä, Markku Lahtinen, Peter Björklund, Kaarle Peltoniemi, Tapio Ahokainen, Lauri P. Pesonen

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Abstract

The invention relates to a method of controlling the thermal balance of the reaction shaft of a suspension smelting furnace and to a concentrate burner for feeding reaction gas and pulverous solid mater into the reaction shaft of the suspension smelting furnace. In the method, endothermic material (16) is fed by the concentrate burner (4) to constitute part of the mixture formed from the powdery solid matter (6) and reaction gas (5), so that a mixture containing the powdery solid matter (6), reaction gas (5) and endothermic material (6) is formed in the reaction shaft (2). The concentrate burner (4) comprises cooling agent feeding equipment (15) for adding the endothermic material (16) to constitute part of the mixture, which is formed from the pulverous solid matter (6) that discharges from the orifice (8) of the feeder pipe and the reaction gas (5) that discharges through the annular discharge orifice (14).

Claims17

Dependent claims

A method of controlling thermal balance of a reaction shaft of a suspension smelting furnace, comprising

using a concentrate burner that comprises
a pulverous solid matter supply device for feeding pulverous solid matter into the reaction shaft, and
a gas supply device for feeding reaction gas into the reaction shaft,
the method comprising
feeding into the reaction shaft pulverous solid matter, and
feeding reaction gas into the reaction shaft for mixing reaction gas with pulverous solid matter to form a mixture by powdery solid matter and reaction gas in the reaction shaft of the suspension smelting furnace,
wherein
endothermic material is fed by the concentrate burner to constitute part of the mixture formed by powdery solid matter and reaction gas in the reaction shaft of the suspension smelting furnace, so that a mixture containing powdery solid matter, reaction gas and endothermic material is formed in the reaction shaft of the suspension smelting furnace;
and wherein the endothermic material is a liquid cooling agent.

6 more elements

Dependencies are inferred from the claim text.