Apparatus for manufacturing reduced iron and method for manufacturing the same

Patent metadata

Field	Value
Publication number	US-9783862-B2
Application number	US-201013496683-A
Country	US
Kind code	B2
Filing date	Jul 14, 2010
Priority date	Sep 17, 2009
Publication date	Oct 10, 2017
Grant date	Oct 10, 2017

Abstract

Provided is an apparatus for manufacturing reduced iron and a method for manufacturing reduced iron. The method for manufacturing reduced iron includes the steps of: i) drying ores in an ore drier; ii) supplying the dried ores to at least one reduction reactor; iii) reducing the ores in the at least one reduction reactor and manufacturing reduced iron; iv) discharging exhaust gas by which the ores are reduced in the reduction reactor; v) branching the exhaust gas and providing the branched exhaust gas as ore feeding gas; and vi) exchanging heat between the exhaust gas and the ore feeding gas and transferring the sensible heat of the exhaust gas to the ore feeding gas. In the steps of supplying the dried ores to the at least one reduction reactor, the dried ores are supplied to the at least one reduction reactor by using the ore feeding gas.

First claim

What is claimed is:

1. An apparatus for manufacturing reduced iron, comprising:
an ore drier for drying ores, the ore drier having an inlet and an outlet;
an ore supplier for receiving the dried ores from the ore drier and feeding the dried ores through an ore supply pipe into a feeding gas pipe carrying an ore feeding gas, wherein the ore supplier has an inlet and an outlet;
at least one reduction reactor for receiving the dried ores carried by the ore feeding gas from the feeding gas pipe and reducing the dried ores to manufacture reduced iron;
an exhaust gas pipe connected to the reduction reactor to discharge the exhaust gas by which the dried ores have been reduced;
a heat exchanger through which the exhaust gas pipe and the feeding gas pipe pass to transfer sensible heat of the exhaust gas to the ore feeding gas;
a dust collector installed in the exhaust gas pipe; and
a gas compressor installed in the exhaust gas pipe,
wherein the feeding gas pipe is branched from the exhaust gas pipe and the exhaust gas passes through the dust collector and the gas compressor installed in the exhaust gas pipe before the feeding gas pipe branches from the exhaust gas pipe.

2. The apparatus for manufacturing reduced iron of claim 1 , wherein the ore supply pipe extends in a direction crossing a direction in which the feeding gas pipe extends.

3. The apparatus for manufacturing reduced iron of claim 1 , wherein the reduction reactor is a fluidized bed reduction reactor or a packed bed reduction reactor.

4. The apparatus for manufacturing reduced iron of claim 1 , wherein the feeding gas pipe is branched from the exhaust gas pipe which provides the ore feeding gas to the feeding gas pipe, the feeding gas pipe includes a first feeding gas pipe part extending in a first direction and a second feeding gas pipe part connected to the first feeding gas pipe part and extending along a second direction crossing the first direction, wherein the second feeding gas pipe part extends vertically, and the feeding gas pipe further includes a plurality of third feeding gas pipe parts connected to the second feeding gas pipe part and extending along a third direction crossing the second direction, wherein the plurality of third feeding gas pipe parts is radially connected to the reduction reactor.

5. The apparatus for manufacturing reduced iron of claim 4 , wherein the dried ore is supplied to the first feeding gas pipe.

6. The apparatus for manufacturing reduced iron of claim 1 , wherein the dried ores are fed directly from the ore supplier to at least one reduction reactor through at least a portion of the feeding gas pipe.

7. The apparatus for manufacturing reduced iron of claim 6 , wherein the feeding gas pipe is branched from the exhaust gas pipe which provides the ore feeding gas to the feeding gas pipe, the feeding gas pipe includes a first feeding gas pipe part extending in a first direction and a second feeding gas pipe part connected to the first feeding gas pipe part and extending along a second direction crossing the first direction, wherein the second feeding gas pipe part extends vertically, and the feeding gas pipe further includes a plurality of third feeding gas pipe parts connected to the second feeding gas pipe part and extending along a third direction crossing the second direction, wherein the plurality of third feeding gas pipe parts is radially connected to the reduction reactor.

8. The apparatus for manufacturing reduced iron of claim 1 , wherein the dust collector is a dry dust collector.

Assignees

• Shin Myoung-Kyun
• Kim Dong-Won
• Kim Sang-Hyun
• Lee Jun-Hyuk
• Posco

Inventors

• Shin Myoung-Kyun
• Kim Dong-Won
• Kim Sang-Hyun
• Lee Jun-Hyuk

Classifications

• C21B2100/80

  Interaction of exhaust gases produced during the manufacture of iron or steel with other processes · CPC title

• C21B2100/66

  Heat exchange · CPC title

• C21B13/0033 Primary

  In fluidised bed furnaces or apparatus containing a dispersion of the material · CPC title

• C21B2100/40

  Gas purification of exhaust gases to be recirculated or used in other metallurgical processes · CPC title

• C21B13/143

  Injection of partially reduced ore into a molten bath · CPC title