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System and method for producing sponge iron by gas-based shaft furnace

A technology of gas-based shaft furnace and sponge iron, which is applied in the field of metallurgy, can solve the problems of reducing gas inlet blockage, reduce carbon deposition effect, and good economic benefits, so as to improve production efficiency, reduce carbon deposition effect, and economic benefits Good results

Pending Publication Date: 2018-03-30
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention proposes a system and method for producing sponge iron in a gas-based shaft furnace, combining reforming and carburizing, replacing nickel-based catalysts with high metallization rate pellets, and realizing gas conversion At the same time, high carburized sponge iron is obtained, which has good economic benefits and low cost. Compared with the traditional shaft furnace process, the cooling of the shaft furnace is omitted, the carbon precipitation effect is greatly reduced, and the problem of blockage of the reducing gas inlet is solved. Improved production efficiency

Method used

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  • System and method for producing sponge iron by gas-based shaft furnace
  • System and method for producing sponge iron by gas-based shaft furnace

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Effect test

Embodiment 1

[0057] Embodiment 1: The coke oven gas composition after dedusting and desulfurization is: H 2 =60%, CO=8%, CO 2 =2%, CH 4 =25%, N 2 =3%; at the same time, spray 16% of the gas volume of water vapor into the heating furnace, the heating furnace will heat the mixed gas to 1050 °C, the high-temperature gas enters the gas reforming and carburizing device for conversion, and the high-methane gas is converted into gas The composition is: H 2 =80%, CO=12.4%, CO 2 =2.2%, CH 4 =3%,N 2 =2.2%, the temperature drops to 950°C, the converted gas enters the shaft furnace reduction device to reduce iron-containing minerals, the metallization rate of the pellets reaches 95%, the carbon content is less than 0.5%, and part of the metallized pellets enters the gas The reforming and carburizing device completes carburizing, and the sponge iron with a metallization rate of 85-88% and a carbon content of 2-4% is obtained, which can be directly melted.

[0058] The temperature of the top gas ...

Embodiment 2

[0059] Embodiment two: the coke oven gas composition after dedusting and desulfurization is: H 2 =63%, CO=6%, CO 2 =4%, CH 4 =20%, N 2 =2.5%. At the same time, 12% of the gas volume water vapor is sprayed into the heating furnace. The heating furnace raises the temperature of the mixed gas to 1050°C. The high-temperature gas enters the gas reforming and carburizing device for conversion. The gas composition of the high-methane gas after conversion is: H 2 =76.7%, CO=15.8%, CO 2 =3.2%, CH 4 =2.4%, the temperature drops to 960°C, the converted gas enters the shaft furnace to reduce iron-containing minerals, the metallization rate of the pellets reaches 93%, and the carbon content is <0.3%; part of the metallized pellets enters the gas reforming And the carburizing device completes carburizing to obtain sponge iron with a metallization rate of 85-88% and a carbon content of 2-4% C%, which can be directly melted.

[0060] The temperature of the top gas produced by the reduct...

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Abstract

The invention relates to a system and method for producing sponge iron in a gas-based shaft furnace. The system includes: a heating furnace, a gas reforming and carburizing device, a shaft furnace reducing device and a furnace top gas purification device; the invention combines reforming and carburizing Combined, while realizing gas conversion, high-carburized sponge iron is obtained, which has good economic benefits and low cost. Compared with the traditional shaft furnace process, the cooling of the shaft furnace is omitted, the carbon precipitation effect is greatly reduced, and the reduction gas intake is solved. Air clogging problem.

Description

technical field [0001] The invention belongs to the field of metallurgy, and relates to a system and method for producing sponge iron in a gas-based shaft furnace, in particular to a system and method for producing sponge iron by using reducing gas with high methane content. Background technique [0002] As a typical non-blast furnace ironmaking process, direct reduced iron technology has the advantages of not using coking coal, being environmentally friendly, and having obvious energy-saving and emission-reducing effects. It plays an important role in improving the steel structure and improving the quality of steel products; However, due to the shortage and poor quality of steel scrap, there is a strong demand for high-quality DRI. According to the statistics of the my country Scrap Steel Application Association, the current market demand for sponge iron in my country is about 15-20 million t / a. The output of direct reduced iron in my country is less than 600,000 tons, so dir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/02
CPCC21B13/02C21B13/0073
Inventor 唐敬坤员晓韩志彪邓君刘亮吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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