Arrangement and method for heating gas in a gas duct in connection with continuously operated sintering
AssigneeOutokumpu Oyj
InventorsPekka Niemela, Eero Vaananen, Jouko Pirttimaa, Olavi Tulkki
Life of this patent
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Abstract
The invention relates to an arrangement and method for heating gases in a gas circulation duct in connection with continuously operated sintering. In the sintering furnace, hot gas is fed in from above the belt in order to sinter the material located on the belt, and part of the gas circulation duct is formed as a burning zone, a burner ring, where the gas is heated. The burner ring comprises at least one burner unit directed inwardly from the circumference of the gas circulation duct.
Claims19
An arrangement for heating gas in a gas circulation duct (4, 5) of a continuously operated sintering arrangement, wherein the sintering arrangement comprises a sintering furnace (2), a sintering belt (1) rotating inside said furnace and at least one gas circulation duct (3,4,5) from which the gas is fed through the sintering belt, characterized in that a part of the gas circulation duct (4, 5), placed above the sintering belt (1), is formed as a burner ring (16, 17), said burner ring comprising at least two burner units (21) directed inwardly from the circumference of the gas circulation duct.
A method for heating gas in a gas circulation duct (4, 5) in connection with continuously operated sintering, wherein a material to be sintered is fed as a bed onto a sintering belt (1) which proceeds in a sintering furnace (2) through at least a preheating (9) and sintering zone (10) into which gas is fed through the gas circulation ducts (4,5), characterized in that gas is heated in a burner ring (16, 17) of the gas circulation duct (4, 5), placed above the sintering belt (1) outside the furnace (2), up to a temperature of 1,000-1,600° C.;
- after the fuel used for heating has been ignited, the combustion air needed for burning is obtained from the gas flowing in the gas circulation duct, and fuel is fed in the burner ring at least from two burner units (21) directed inwardly from circumference edges of the gas circulation duct.
Dependencies are inferred from the claim text.