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Method and system for producing sponge iron through COREX device and direct reduction vertical furnace

A technology of sponge iron and shaft furnace, which is applied in the field of metallurgical chemistry, can solve the problems of low utilization rate of reducing gas in shaft furnace and low reduction degree of DRI, etc., and achieve the effects of making up for insufficient gas production, improving reduction capacity, and promoting reduction

Pending Publication Date: 2017-07-18
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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Problems solved by technology

In 2007, Baosteel completed and put into operation the world's first COREX device with an annual output of 1.5 million tons of molten iron, making my country the fourth country in the world to adopt COREX technology, which opened up a new direction for the sustainable development of China's iron and steel industry. At present, there are many technical problems to be solved in the production of COREX process, such as the low reduction degree of DRI and the low utilization rate of reducing gas in the shaft furnace

Method used

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  • Method and system for producing sponge iron through COREX device and direct reduction vertical furnace
  • Method and system for producing sponge iron through COREX device and direct reduction vertical furnace

Examples

Experimental program
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Effect test

Embodiment 1

[0054] refer to Figure 1-2 , coal is pyrolyzed in the melter-gasifier 1 to produce pyrolysis gas, and at the same time, the coal coke produced by pyrolysis is reacted with oxygen at high temperature to generate coal gas in the gasifier 1, and the generated coal gas is transported to the In the pre-reduction shaft furnace 2, the iron ore in the pre-reduction shaft furnace 2 is reduced to obtain the COREX output gas, wherein the composition and volume of the COREX output gas are: H 2 13.82 parts by volume, CO 45.25 parts by volume, CH 4 0.63 parts by volume, N 2 9.62 parts by volume, CO 2 30.68 parts by volume; reducing gas reduces iron ore in the direct reduction shaft furnace 4, and generates top gas at the top section of the direct reduction shaft furnace 4, wherein the composition and volume of the top gas are H 2 29.6 parts by volume, CO 21.2 parts by volume, CH 4 2.6 parts by volume, CO 2 18.7 parts by volume, N 2 9.3 parts by volume, H 2 O 18.6 parts by vo...

Embodiment 2

[0057] refer to Figure 1-2 , coal is pyrolyzed in the melter-gasifier 1 to produce pyrolysis gas, and at the same time, the coal coke produced by pyrolysis is reacted with oxygen at high temperature to generate coal gas in the gasifier 1, and the generated coal gas is transported to the In the pre-reduction shaft furnace 2, the iron ore in the pre-reduction shaft furnace 2 is reduced to obtain the COREX output gas, wherein the composition and volume of the COREX output gas are: H 2 10 parts by volume, CO 40 parts by volume, CH 4 0.5 parts by volume, N 2 8 parts by volume, CO 2 35 parts by volume; reducing gas reduces iron ore in the direct reduction shaft furnace 4, and generates top gas at the top of the direct reduction shaft furnace 4, wherein the composition and volume of the top gas are H 2 25 parts by volume, CO 15 parts by volume, CH 4 1 part by volume, CO 2 15 parts by volume, N 2 10 parts by volume, H 2 O 20 parts by volume; the obtained COREX output g...

Embodiment 3

[0060] refer to Figure 1-2 , coal is pyrolyzed in the melter-gasifier 1 to produce pyrolysis gas, and at the same time, the coal coke produced by pyrolysis is reacted with oxygen at high temperature to generate coal gas in the gasifier 1, and the generated coal gas is transported to the In the pre-reduction shaft furnace 2, the iron ore in the pre-reduction shaft furnace 2 is reduced to obtain the COREX output gas, wherein the composition and volume of the COREX output gas are: H 2 15 parts by volume, CO 50 parts by volume, CH 4 1 part by volume, N 2 10 parts by volume, CO 2 25 parts by volume; reducing gas reduces iron ore in the direct reduction shaft furnace 4, and generates top gas at the top of the direct reduction shaft furnace 4, wherein the composition and volume of the top gas are H 2 35 parts by volume, CO 25 parts by volume, CH 4 4 parts by volume, CO 2 20 parts by volume, N 2 8 parts by volume, H 2 O 15 parts by volume; the obtained COREX output gas...

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Abstract

The invention relates to a method for producing sponge iron through a COREX device and a direct reduction vertical furnace. The method comprises the steps that coal is pyrolyzed in a melting gasifier to produce pyrolysis gas, meanwhile, coal char and oxygen react to produce coal gas, and the coal gas is conveyed into a pre-reduction vertical furnace through a pipeline to reduce iron ore, so that COREX output coal gas is obtained; iron ore is reduced in the direct reduction vertical furnace through reduction gas, and furnace top coal gas is generated; after being cooled and dedusted through a coal gas washing device, the obtained two kinds of coal gas are mixed and enter a pressurizing machine to be pressurized, and then the mixed coal gas enters a decarbonization device and a nitrogen extraction device to be processed and is conveyed to a coal gas cabinet to be stored; one part of the stored coal gas is sprayed into the melting gasifier, and the rest of the stored coal gas and coke furnace coal gas or natural gas are mixed and enter a humidifier to be supplemented with water vapor; the mixed gas supplemented with the water vapor enters a reforming furnace to be prepared into reduction gas; and the reduction gas is conveyed into the direct reduction vertical furnace to reduce the iron ore, so that the sponge iron is prepared. According to the method for producing the sponge iron through the COREX device and the direct reduction vertical furnace, the reduction capacity of the reduction coal gas can be improved, and the utilization ratio of the reduction coal gas can be increased.

Description

technical field [0001] The present invention belongs to the technical field of metallurgical chemistry, and more particularly, relates to a method for producing sponge iron with a COREX device and a direct reduction shaft furnace and a system for implementing the method. Background technique [0002] my country is a big country in steel production. In 2015, the crude steel output in mainland China was 804 million tons, accounting for 49.5% of the global total. However, the structure of the iron and steel industry is unreasonable, with a high iron-to-steel ratio and a small proportion of electric furnace steel, and some special steel varieties still need to be imported. High energy consumption and high pollution process. [0003] The COREX smelting reduction ironmaking method is a non-blast furnace ironmaking technology developed by voestalpine. It can not only use non-coking coal for direct ironmaking, but also has the advantages of short process flow and less environmental...

Claims

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Application Information

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IPC IPC(8): C21B13/02
CPCY02P10/143C21B13/02C21B13/0073
Inventor 员晓范志辉刘亮曹志成吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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