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

The invention provides a facility for hot metal manufacturing by directly using small or lump coal and powdered iron ores, a method for producing the same, a complete steel mill using the facility and manufacturing method. The method for manufacturing hot metal comprises the steps of: mixing powdered iron-bearing ores with auxiliary raw materials and drying the mixture to obtain iron-bearing mixture; reducing and sintering the iron-bearing mixture and turning the iron-bearing mixture into reduction material when the iron-bearing mixture passes through multistage fluidized bed reactor units mutually connected in series; compacting the reduction material at a high temperature to manufacture agglomerated ores, loading a coal briquette made of lump coal and compacting powder into a smelting furnace-gasifier to form a coal filling bed serving as heat source for melting agglomerated ores; loading the agglomerated ores into the smelting furnace-gasifier connected with the multistage fluidized bed reactor units and sending oxygen into the smelting furnace-gasifier to manufacture hot metal; and supplying the multistage fluidized bed reactor units with reduction gas discharged by the smelting furnace-gasifier.

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

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