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Selective distribution and granulation method of fuel for enhancing iron ore sintering with biomass energy

A biomass fuel and biomass energy technology is applied in the field of selective distribution and granulation of fuel for strengthening biomass energy iron ore sintering, which can solve the problems of reducing the yield of sintered ore, the strength of the drum, and the degree of fuel combustion.

Active Publication Date: 2012-12-26
CENT SOUTH UNIV
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  • Claims
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Problems solved by technology

However, because the properties of biomass fuel are quite different from those of coke powder and unburned coal, compared with conventional fuels, its good combustibility makes the combustion speed too fast during the sintering process, and its good reactivity makes it easy to gasify and generate CO. Reduce the combustion degree of the fuel, resulting in its replacement of conventional fuels, which reduces the yield of sintered ore and the strength of the drum

Method used

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  • Selective distribution and granulation method of fuel for enhancing iron ore sintering with biomass energy

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Embodiment 1

[0027] Conventional granulation: Through the sintering test, determine the amount of coke powder required for sintering when all coke powder is used. When the biomass fuel replaces part of the coke powder, the ratio of the biomass fuel is calculated using the principle of equal heat replacement, that is, the heat provided by the combustion of the biomass fuel is equal to the heat generated by the coke powder or coal fuel it replaces. When 40% of the coke powder is replaced by fruit stone charcoal with an average particle size of 2.65 mm (obtained by carbonization of hawthorn fruit stones from processing waste), the conventional granulation method is adopted, that is, iron ore, biomass fuel, limestone, dolomite, quicklime , sintering return ore, and coke powder are granulated together for a period of time, and then sintered. The results are shown in Table 1. It can be seen that the use of conventional granulation and the substitution of 40% coke powder by fruit stone charcoal r...

Embodiment 2

[0031] Conventional granulation: replace 40% of the coke powder with wood charcoal (obtained by woody biochar) with an average particle size of 2.41 mm. Using conventional granulation methods, wood charcoal instead of coke powder reduces the yield of sintered ore. Drum Strength and Utilization Factor.

[0032] Fuel selective distribution granulation: When wood charcoal replaces 40% of coke powder, wood charcoal, iron ore 5 times the weight of wood charcoal, and quicklime accounting for 10% of the total weight of wood charcoal and iron ore are firstly placed in a disc system The mother core with a particle size of 4mm is made in a granulator, and then mixed with iron ore, limestone, dolomite, quicklime, sintered return ore, and coke powder with a mass ratio of 60:9:3:2.2:23:2.8. Granulate in the cylinder granulator for 4 minutes, then ignite and sinter the mixture. The sintering index is shown in Table 1. It can be seen that when wood charcoal replaces 40% coke powder, by selec...

Embodiment 3

[0034] Conventional granulation: Substituting straw charcoal (obtained by carbonization of rice straw) with an average particle size of 2.05 mm for 20% of coke powder with equal heat, using conventional granulation methods, straw charcoal instead of coke powder reduces the yield of sintered ore, conversion Drum Strength and Utilization Factor.

[0035] Fuel selective distribution granulation: When straw charcoal replaces 20% coke powder, straw charcoal, iron ore that is 8 times the weight of straw charcoal, and quicklime that accounts for 3% of the total weight of straw charcoal and iron ore are mixed in a disc system The mother core with a particle size of 3mm is made in a granulator, and then mixed with iron ore, limestone, dolomite, quicklime, sintered return ore, and coke powder with a mass ratio of 59:8:3:3.4:23:3.6. Granulate in the cylinder granulator for 4 minutes, and then ignite and sinter the mixture. The sintering index is shown in Table 1. It can be seen that when...

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Abstract

A selective distribution and granulation method of fuel for enhancing iron ore sintering with biomass energy distributes biomass fuel at the core part of a mixture before sintering by two-stage granulation to properly reduce the burning rate of the biomass fuel and improve the burning degree of the biomass fuel, so as to achieve the purpose of enhancing biomass energy sintering, wherein the two-stage granulation comprises the steps of: firstly preparing biomass fuel, iron ore and quicklime in a granulating disc into mother nuclide with the granularity of 3-5mm, then mixing with iron ore, limestone, dolomite, quicklime, sinter returns and coke powder (or coal), and carrying out second granulation for 3-6min in a granulating drum, so as to obtain the mixture before sintering with the biomass fuel wrapped at the core part. By selective distribution technology of the biomass fuel, the biomass fuel can be applied to iron ore sintering so as to successfully substitute for 10-60% of coke powder and not to influence the yield and quality indexes of the sintered ore.

Description

technical field [0001] The invention belongs to the sintering industry in the field of iron and steel metallurgy, and relates to a method for reasonably distributing biomass fuel in granulated pellets to strengthen biomass energy sintering, so that biomass fuel can be used in iron ore sintering to replace some fossil fuels without affecting Sinter production and quality indicators. Background technique [0002] Sinter is the main iron-containing charge for blast furnace ironmaking. In my country's blast furnace charge structure, sinter generally accounts for more than 75%. However, iron ore sintering is a typical high-energy consumption and high-pollution industry, and its process energy consumption ranks second among iron and steel enterprises, generally accounting for 9%-12% of the total energy consumption of the enterprise. And the emissions from the sintering process contain a large amount of greenhouse gas CO 2 and polluting gas SO x , NO x The flue gas is the main ...

Claims

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Application Information

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IPC IPC(8): C22B1/14
Inventor 范晓慧甘敏陈许玲袁礼顺姜涛李光辉郭宇峰杨永斌张元波李骞黄柱成白国华许斌朱忠平季志云余志元黄晓贤
Owner CENT SOUTH UNIV
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