Facility for hot metal manufacturing by directly using small or lump coal and powdered iron ores, method for producing the same, complete steel mill using the facility and manufacturing method

Abstract

Provided is an apparatus for manufacturing molten iron using directly fine or lump coals and fine iron-containing ores, a method thereof, an integrated steel mill using the same, and a method thereof.. The method of manufacturing the molten iron comprises the steps of: manufacturing iron-containing mixture by mixing fine iron-containing ores and supplementary raw materials and by drying the resultant mixture, converting the iron-containing mixture to a reduced material by reducing and sintering while passing the iron-containing mixture through multi-stage fluidizedbed reactor unit, which are sequentially connected to each other, manufacturing briquettes by briquetting the reduced material at high temperature, forming a coal packed bed by charging lump coals and briquettes which are made by briquetting fine coals, into a melter-gasifier as heat sources for melting the briquettes, і manufacturing molten iron by charging the briquettes into the melter-gasifier connected to the multi-stage fluidized-bed reactor unit and by supplying oxygen into the melter-gasifier, and supplying reducing coal-gas exhausted from the melter-gasifier into the multi-stage fluidized-bed reactor unit.

Description

[0001] This application is the PCT / KR2004 / 003192 patent of invention filed on December 6, 2004 entitled "Equipment and method for making molten iron directly using pulverized coal or lump coal and iron powder ore, combined steel mill and method using them" The divisional application of the original application entered the Chinese national phase on March 14, 2006, and obtained the Chinese patent application number 200480026483.7. technical field [0002] The present invention relates to an apparatus and method for manufacturing molten iron, a combined steelworks using them and a method. More specifically, the present invention relates to a kind of equipment and method for producing molten iron by directly using pulverized coal or lump coal and iron-containing fine ore, a combined steel factory and method using them. Background technique [0003] The iron and steel industry is a core industry that provides the raw materials needed for construction and the manufacture of automo...

AI Technical Summary

Problems solved by technology

[0011] However, in the equipment and method disclosed in U.S. Patent No. 5,961,690, since the reducing gas stream separated from the final reactor only passes through one fluidized bed, a large amount of tar and dust are contained in the reducing gas

Therefore, after cooling the separated reducing gas and removing CO from it 2 And when it is compressed, the tar contained in the reducing gas is also used to cool the reducing gas and remove CO 2 Condensation on the device that causes it to condense, causing mechanical problems during operation

In addition, in the apparatus and method disclosed in U.S. Patent No. 5,961,690, in addition to the cooling equipment that needs to be cooled with water to cool the high-temperature reducing gas finally discharged from the multi-stage fluidized bed reactor unit, it is also necessary to provide Cooling equipment for the high-temperature reducing gas emitted, thereby increasing the amount of cooling water used and placing an excessive burden on all treatment processes

Images