Molten iron manufacturing apparatus and molten iron manufacturing method

Patent metadata

Field	Value
Publication number	US-10422582-B2
Application number	US-201214654913-A
Country	US
Kind code	B2
Filing date	Dec 28, 2012
Priority date	Dec 27, 2012
Publication date	Sep 24, 2019
Grant date	Sep 24, 2019

Abstract

An apparatus for manufacturing molten iron includes: an iron ore-mixing/pre-reducing furnace receiving and mixing natural iron ore and oxidized iron ore to form a mixture, and heating or pre-reducing the mixture using a reaction gas to form a pre-heated or pre-reduced iron ore; an iron ore reduction furnace receiving the pre-heated or pre-reduced iron ore iron ore and reducing the pre-heated or pre-reduced iron ore using a reduction gas to form a reduced iron ore and produce the reaction gas; a molten gasification furnace receiving coal and the reduced iron ore and producing molten iron and the reduction gas; and an iron ore oxidizing-burning furnace receiving part of the reduced iron ore discharged from the iron ore reduction furnace and oxidizing the received reduced iron ore to produce the oxidized iron ore. The oxidized iron ore is supplied to the iron ore-mixing/pre-reducing furnace.

First claim

The invention claimed is:

1. An apparatus for manufacturing molten iron, comprising:
an iron ore-mixing/pre-reducing furnace that receives and mixes natural iron ore and oxidized iron ore to form a mixture of the natural iron ore and the oxidized iron ore, and heats or pre-reduces the mixture using a reaction gas having reduction ability to form a pre-heated or pre-reduced iron ore;
an iron ore reduction furnace that receives the pre-heated or pre-reduced iron ore discharged from the iron ore-mixing/pre-reducing furnace and reduces the pre-heated or pre-reduced iron ore using a reduction gas to form a reduced iron ore and produce the reaction gas having reduction ability, wherein the reaction gas having reduction ability is supplied to the iron ore-mixing/pre-reducing furnace;
a molten gasification furnace that receives coal and the reduced iron ore produced by the iron ore reduction furnace and produces molten iron and the reduction gas, wherein the reduction gas is supplied to the iron ore reduction furnace;
an iron ore oxidizing-burning furnace that receives part of the reduced iron ore discharged from the iron ore reduction furnace and oxidizes the received reduced iron ore to produce the oxidized iron ore by burning the received reduced iron ore, wherein the oxidized iron ore is supplied to the iron ore-mixing/pre-reducing furnace; and
a hydrogen producing device, wherein the part of the reduced iron ore passes through the hydrogen producing device and is supplied to the iron ore oxidizing-burning furnace, and the part of the reduced iron ore passing through the hydrogen producing device reacts with steam to produce hydrogen gas.

2. The apparatus of claim 1 , further comprising: an exhaust gas processing device that receives carbon monoxide from the iron ore-mixing/pre-reducing furnace and produces carbon dioxide and hydrogen.

3. The apparatus of claim 2 , wherein the exhaust gas processing device includes a water-gas shift reactor and a hydrogen pressure swing adsorption (H 2 PSA).

4. The apparatus of claim 2 , wherein the hydrogen producing device includes a hydrogen supply line through which the hydrogen is supplied to the iron ore reduction furnace.

Assignees

• Posco

Inventors

• Jung Jonghwun
• Namkung Won
• Cho Minyoung
• Yi Sang-Ho
• Woo Jong-Soo

Classifications

• C21B2100/24

  by shift reactions · CPC title

• C21B2100/62

  Energy conversion other than by heat exchange, e.g. by use of exhaust gas in energy production · CPC title

• C21B13/0086

  Conditioning, transformation of reduced iron ores · CPC title

• C21B13/146

  Multi-step reduction without melting · CPC title

• C21B13/143

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