Burning apparatus and method for manufacturing reduced iron using the same

Patent metadata

Field	Value
Publication number	US-9976806-B2
Application number	US-201414526607-A
Country	US
Kind code	B2
Filing date	Oct 29, 2014
Priority date	Oct 30, 2013
Publication date	May 22, 2018
Grant date	May 22, 2018

Abstract

A method for manufacturing reduced iron using the same, and more particularly, to a burning apparatus heating a coal briquette to manufacture reduced iron, which includes a first burning furnace heating the coal briquette while moving the truck accommodating the coal briquette along a linear movement path; a second burning furnace connected to the other side of the first burning furnace, and heating the coal briquette while moving the coal briquette discharged from the truck along an annular path; and a cooling device connected to the second burning furnace, and cooling the reduced iron while moving reduced iron reduced in the second burning furnace along an annular path. The burning apparatus circulates exhaust gases generated in the burning furnace and cooling device to control a temperature and an oxygen concentration and thus improves a metallization rate of the reduced iron.

First claim

What is claimed is:

1. A method for manufacturing iron by moving a truck accommodating a coal briquette into a burning furnace, wherein the burning furnace is partitioned into a drying region, a pre-heating region, a reduction region, a first cooling region, and a second cooling region along a movement direction of the truck, the method comprising:
introducing air into the first cooling region and the second cooling region;
generating an exhaust gas in the pre-heating region, the reduction region, the first cooling region, and the second cooling region; and
circulating at least part of the exhaust gas inside the burning furnace;
wherein:
the exhaust gas generated in the reduction region is supplied to the first cooling region;

at least part of the exhaust gas generated by the air passing through the second cooling region is discharged to outside; and
the remainder of the exhaust gas generated by the air passing through the second cooling region is supplied to the drying region.

2. The method of claim 1 , further comprising:
reducing at least part of the exhaust gas generated in the reduction region in temperature; and
supplying the at least part of the exhaust gas with reduced temperature to the first cooling region.

3. The method of claim 1 , further comprising:
supplying at least part of the exhaust gas generated in the first cooling region to the drying region; and
supplying the remainder of the exhaust gas generated in the first cooling region to the reduction region.

4. The method of claim 3 , further comprising:
supplying at least part of the exhaust gas generated in the reduction to the pre-heating region.

5. The method of claim 4 , wherein the reduction region and the pre-heating region have an oxygen concentration lower than that of the first cooling region.

6. The method of claim 5 , wherein the first cooling region has an oxygen concentration lower than that of the second cooling region.

7. A method for manufacturing reduced iron by moving a truck accommodating a coal briquette into a burning furnace, the method comprising:
generating a first exhaust gas by removing volatile matters of a carbonaceous material contained in the coal briquette;
circulating at least part of the generated first exhaust gas inside the burning furnace, and introducing external air inside the burning furnace;
cooling the reduced iron with the generated first exhaust gas and the external air;
pre-heating the coal briquette after removing the volatile matters of the carbonaceous material; and
mixing a second exhaust gas generated from pre-heating the coal briquette and a third exhaust gas generated from cooling the reduced iron to heat the coal briquette.

8. The method of claim 7 , further comprising:
removing moisture prior to removing the volatile matters of the carbonaceous material by using a fourth exhaust gas generated from pre-heating the coal as a heat source.

9. The method of claim 8 , further comprising:
cooling the reduced iron to a temperature of 400° C. or lower with the generated first exhaust gas from removing the volatile matters of the carbonaceous material; and
cooling, to a temperature of 100° C. or lower, the reduced iron with the external air.

10. The method of claim 9 , further comprising:
cooling, to a temperature of 100° C. or lower, the reduced iron with a gas mixture of the external air and the generated first exhaust gas from removing the volatile matters of the carbonaceous material.

Assignees

• Posco

Inventors

• Son Sang Han
• Park Jong In
• Wang Min Kyu
• Hwang Byung Woon

Classifications

• C21B13/0073

  Selection or treatment of the reducing gases · CPC title

• F27B2017/0091

  Series of chambers, e.g. associated in their use · CPC title

• F27D7/04

  Circulating atmospheres by mechanical means · CPC title

• Y02P10/136

  Cross-Sectional Technologies · mapped topic

• F27D17/00

  Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases · CPC title