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Sintering carbon emission reduction method based on efficient fuel combustion in ultrahigh bed sintering process

A sintering process and carbon emission reduction technology, which is applied in the field of iron and steel metallurgy to achieve the effect of increasing internal oxygen potential, promoting efficient combustion and improving combustion conditions

Pending Publication Date: 2022-08-05
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the technical problems existing in the existing ultra-thick material bed sintering process, the purpose of the present invention is to provide a sintering carbon emission reduction method based on the efficient combustion of fuel in the ultra-high material bed sintering process. The characteristics of different sections of the sintered material and the different requirements for oxygen content in different sections, by properly selecting the type and particle size of the sintered solid fuel and adopting a special granulation process, and sintering by reasonably injecting oxygen-enriched gas medium, It can meet the limitations of different oxygen content requirements at different heights of the material layer to a greater extent, and at the same time synergistically improve the fuel combustion efficiency, further reduce the consumption of solid fossil fuels, realize uniform heat and low carbon in the sintering process, and reduce CO 2 Greenhouse gas and CO and other pollutants have been effectively reduced

Method used

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  • Sintering carbon emission reduction method based on efficient fuel combustion in ultrahigh bed sintering process
  • Sintering carbon emission reduction method based on efficient fuel combustion in ultrahigh bed sintering process

Examples

Experimental program
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Effect test

Embodiment 1

[0031] According to the mass ratio of 60.74% iron ore, 2.19% dolomite, 6.58% quicklime, 11.77% sintered ore, 15.19% blast furnace ore, 2.68% coke powder, 0.85% core carbon (the chemical composition of the sintered ore is TFe56 .97%, R2.05, MgO1.45%, CaO10.29%), of which fine-grained coke powder (-0.5mm) accounted for 17%, and medium-grained coke powder (0.5-3mm) accounted for 59% , coarse-grained stone charcoal (+3mm) accounted for 24%. The fine-grained coke powder and part of the iron concentrate are mixed with pre-granulation (the mixing mass ratio of the two is 1:5, the granulation time is 2min, and the average particle size of the particle I is 1.68mm), and then the particle I is mixed with the rest of the raw materials. After granulation, conventional size granules II were obtained, and the granules II were placed on the sinter with a height of 1000mm, ignited for 1min at a temperature of 1050±50°C, kept for 1min, and then sintered under a negative pressure of 15kPa. The...

Embodiment 2

[0033] According to the mass ratio of iron ore 60.74%, dolomite 2.19%, quicklime 6.58%, sintered ore 11.77%, blast furnace ore 15.19%, coke powder 2.89%, core carbon 0.64% (the chemical composition of the sintered ore is TFe56 .97%, R2.05, MgO1.45%, CaO10.29%), of which fine-grained coke powder (-0.5mm) accounted for 20%, and medium-grained coke powder (0.5-3mm) accounted for 62% , coarse-grained stone charcoal (+3mm) accounted for 18%. The fine-grained coke powder and part of the iron concentrate are mixed for pre-granulation (the mixing mass ratio of the two is 1:5.75, the granulation time is 2 min, and the average particle size of particle I is 2.06 mm), and then the particle I is mixed with the rest of the raw materials. After granulation, conventional size granules II were obtained, and the granules II were placed on the sinter with a height of 1000mm, ignited for 1min at a temperature of 1050±50°C, kept for 1min, and then sintered under a negative pressure of 15kPa. The...

Embodiment 3

[0035] According to the mass ratio of 60.74% iron ore, 2.19% dolomite, 6.58% quicklime, 11.77% sintered ore, 15.19% blast furnace ore, 2.86% coke powder, 0.67% core carbon (the chemical composition of the sintered ore is TFe56 .97%, R2.05, MgO1.45%, CaO10.29%), of which fine-grained coke powder (-0.5mm) accounted for 27%, and medium-grained coke powder (0.5-3mm) accounted for 54% , coarse-grained stone charcoal (+3mm) accounted for 19%. The fine-grained coke powder and part of the iron concentrate are mixed for pre-granulation (the mixing mass ratio of the two is 1:6.5, the granulation time is 2 minutes, and the average particle size of particle I is 2.82 mm), and then the particle I is mixed with the rest of the raw materials. After granulation, conventional size granules II were obtained, and the granules II were placed on the sinter with a height of 1000mm, ignited for 1min at a temperature of 1050±50°C, kept for 1min, and then sintered under a negative pressure of 15kPa. ...

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Abstract

The invention discloses a sintering carbon emission reduction method based on high-efficiency fuel combustion in an ultrahigh bed sintering process, which comprises the following steps of: performing primary granulation on fine-fraction fuel and part of iron ore concentrate to obtain pellets I; mixing the pellets I with raw materials including coarse-fraction fuel, medium-fraction fuel, a flux, the rest of iron ore and return mine, and performing secondary granulation to obtain pellets II, wherein the raw materials include the coarse-fraction fuel, the medium-fraction fuel, the flux and the rest of iron ore and return mine; sequentially carrying out super-thick material distribution, ignition and sintering on the pellets II; wherein in the sintering process, an oxygen-enriched gas medium is blown to the surface of the sintering material between the end of ignition heat preservation and the temperature rising point of the sintering waste gas. According to the method, the thermal state of the whole sintered material layer tends to be uniform under the condition of the super-thick material layer, the combustion efficiency of fossil fuel is improved, the consumption of the fossil fuel is reduced, the emission of CO2 can be reduced by 15-30%, the emission of CO can be reduced by 20-40%, and meanwhile, the yield is improved.

Description

technical field [0001] The invention relates to a sintering method, in particular to a sintered carbon emission reduction method based on the efficient combustion of fuel in the sintering process of ultra-high material layer, and belongs to the sintering industry in the field of iron and steel metallurgy. Background technique [0002] As the front-end process of iron and steel industry, sintering has high energy consumption and heavy pollution load, which brings severe challenges to clean production of iron and steel industry. In the traditional sintering process, solid fossil fuels such as coke and anthracite are generally used as the heat source for the physical and chemical reactions of the high temperature process, and their proportion is as high as 75% to 80% of the energy consumption of sintering. A large number of studies have confirmed that the combustion of solid fossil fuels is the 2 , SO X An important source of production and the main source of NO production. ...

Claims

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Application Information

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IPC IPC(8): C22B1/16C22B1/24
CPCC22B1/16C22B1/24Y02E20/34
Inventor 季志云范晓慧郑浩翔甘敏赵改革王一帆孙增青陈许玲黄晓贤涂勇袁礼顺
Owner CENT SOUTH UNIV
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