JP2012207236A5 - - Google Patents

Description

That is, the present invention is to charge a sintered raw material containing fine ore and carbonaceous material on a circulating pallet to form a charging layer, ignite the carbonaceous material on the surface of the charging layer, and lower combustion lower concentration The air above the charging layer containing the diluted gaseous fuel is sucked in the wind box arranged under the pallet and introduced into the charging layer, and the gaseous fuel and the carbonaceous material are burned in the charging layer. In the method for producing sintered ore, the gaseous fuel is supplied to the region where the high temperature region retention time is maintained at 1200 ° C. or higher and 1400 ° C. or lower when sintering with the combustion heat of the carbonaceous material is less than 150 seconds. A method for producing a sintered ore characterized in that the high temperature region holding time is set to 150 seconds or more, and oxygen in the air is enriched within 1/2 of the upstream side of the gaseous fuel supply region.

The manufacturing method of sintered ore of the present invention is characterized by enriching the oxygen on the upstream side (1 / 4-1 / 2) within the region above SL gas fuel supply region.

Claims (9)

A gaseous fuel diluted with a sintered raw material containing fine ore and charcoal on a circulating moving pallet to form a charging layer, igniting the charcoal on the surface of the charging layer and diluting below the lower combustion limit concentration Suction ore is produced by sucking the air above the charging layer, including the slag, into the charging layer by sucking it with a wind box placed under the pallet, and burning the gaseous fuel and carbonaceous material in the charging layer. In the way to
The gas fuel is supplied to a region where the high temperature region holding time maintained at 1200 ° C. or higher and 1400 ° C. or lower when sintering with the combustion heat of the carbonaceous material is less than 150 seconds, so that the high temperature region holding time is 150 seconds or longer. A method for producing sintered ore characterized by enriching oxygen in the air within 1/2 of the upstream side of the gaseous fuel supply region. The amount of carbon material in the sintered raw material is changed to keep the maximum temperature within the range of 1200 to 1400 ° C., and the amount of gaseous fuel supplied to the region where the high temperature region retention time is less than 150 seconds is varied. The method for producing a sintered ore according to claim 1, wherein the high temperature region holding time is 150 seconds. The method for producing sintered ore according to claim 1 or 2, wherein oxygen is enriched in a region within an upstream side (1/4 to 1/2) of the gaseous fuel supply region. The method for producing a sintered ore according to any one of claims 1 to 3 , wherein the oxygen concentration in air is more than 21 vol% and less than 35 vol% by the enrichment of oxygen. By the oxygen enrichment, the O ₂ concentration in the gas atmosphere in the charging layer in the oxygen enriched region is set to 12.5 vol% or more, and the maximum temperature reached is a temperature range of 1275 to 1375 ° C. The manufacturing method of the sintered ore of any one of Claims 1-4 . The enrichment of the supply and the oxygen of the gaseous fuel, more of claims 1 to 5 in which the high temperature zone holding time is characterized by a high-temperature zone holding time in the region is less than 150 seconds or less 300 seconds 150 seconds A method for producing a sintered ore according to claim 1. The method for producing a sintered ore according to any one of claims 1 to 6 , wherein an amount of the carbonaceous material equivalent to a calorific value of the gaseous fuel to be supplied is reduced. The air to which the gaseous fuel is added is obtained by adding gaseous fuel previously diluted below the lower combustion limit concentration to the air, or diluted to below the lower combustion limit concentration by injecting the gaseous fuel into the atmosphere above the charging layer at high speed. The method for producing a sintered ore according to any one of claims 1 to 7 , wherein the method is any one of the above. The gaseous fuel is supplied below a baffle plate having one or more stages with a gap in the middle in the height direction in the hood installed above the charging layer in the region where the gaseous fuel is supplied, The method for producing sintered ore according to any one of claims 1 to 8 , wherein the oxygen to be enriched is supplied toward the gap between the baffle plates above the baffle plate in the hood.