Low-carbon and low-NOx sintering method based on reasonable distribution of fuel

A sintering method and fuel technology, which are applied in the fields of iron ore sintering and low-carbon and low-NOx sintering, can solve the problems of less than 10% utilization rate and waste of resources, and achieve the effects of reducing solid fuel consumption, reducing NO emission and sufficient combustion

Active Publication Date: 2019-04-16
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

my country's biomass resources that can be developed as energy amount to 300 million tons of standard coal, but its utilization rate is less than 10%, resulting in a serious waste of resources

Method used

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  • Low-carbon and low-NOx sintering method based on reasonable distribution of fuel
  • Low-carbon and low-NOx sintering method based on reasonable distribution of fuel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031]Iron ore, flux, returned ore, and straw charcoal (respectively see Table 1 and Table 2 for physical and chemical properties and particle size composition) are batched according to mass percentages of 60%, 12%, 25%, and 3%. After mixing and granulating, they are distributed in the In the material layer at the lower part of the sintering machine, iron ore, flux, returned ore, and coke powder (see Table 1 and Table 2 for physical and chemical properties and particle size composition respectively) are batched according to mass percentages of 58%, 12.5%, 25%, and 4.5%. After mixing , After granulation, it is distributed in the lower material layer of the sintering machine; the flue gas with a CO concentration of 2.0% in the bellows in the middle of the sintering machine is circulated back to the sintering material surface, the number of bellows accounts for 20% of the total number of bellows, and the coverage area accounts for 30% of the length of the sintering machine %. The...

Embodiment 2

[0033] Iron ore, flux, returned ore, and charcoal (see Table 1 and Table 2 for physical and chemical properties and particle size composition, respectively) are batched according to mass percentages of 65%, 12%, 20%, and 3%. After mixing and granulating, they are placed in sintered The lower material layer of the machine, iron ore, flux, return ore, and coke powder (see Table 1 and Table 2 for physical and chemical properties and particle size composition respectively) are batched according to mass percentages of 60%, 12.5%, 23%, and 4.5%. After mixing, After granulation, it is distributed in the lower material layer of the sintering machine; the flue gas with a CO concentration of 1.8% in the bellows in the middle of the sintering machine is circulated back to the sintering material surface, the number of bellows accounts for 25% of the total number of bellows, and the coverage area accounts for 35% of the length of the sintering machine . The schematic diagram of the impleme...

Embodiment 3

[0035] Iron ore, flux, returned ore, and charcoal (see Table 1 and Table 2 for physical and chemical properties and particle size composition respectively) are prepared according to mass percentages of 63%, 12%, 22%, and 3%. The material layer in the lower part of the machine, iron ore, flux, return ore, coke powder (see Table 1 and Table 2 for physical and chemical properties and particle size composition respectively) are batched according to mass percentage 59%, 12.5%, 24%, 4.5%, after mixing, After granulation, it is distributed in the lower material layer of the sintering machine; the flue gas with a CO concentration of 2.2% in the bellows in the middle of the sintering machine is circulated back to the sintering material surface, the number of bellows accounts for 30% of the total number of bellows, and the coverage area accounts for 45% of the length of the sintering machine . The schematic diagram of the implementation of material split granulation, layered distributio...

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Abstract

The invention discloses a low-carbon and low-NOx sintering method based on reasonable distribution of fuel. According to the low-carbon and low-NOx sintering method based on reasonable distribution offuel, a lower fuel layer is mainly fed with new fuel which is high in burning speed, relatively low in heat value and low in nitrogen content, an upper fuel layer is fed with fossil fuel which is lowin burning speed and high in heat value, flue gas with high in CO content in an intermediate air bellow of a sintering machine is circulated to a sintered material surface at the same time, and latent heat of the flue gas is fully utilized for further supplementing heat to the upper fuel layer. According to the low-carbon and low-NOx sintering method based on reasonable distribution of fuel, thecharacteristics that the sintering speed changes from low to high from the upper fuel layer to the lower fuel layer, and heat storage changes from low to high, the difference between the burning speedof the new fuel and the fossil fuel, and the difference between the heat value of the new fuel and the fossil fuel are effectively coupled, the CO latent heat in the fuel gas is efficiently utilized,and at the same time of increasing sintering yield and improving quality indexes, solid fuel consumption of each ton of sinter is reduced by 2kgce to 4 kgce, CO emission is reduced by 30% to 50%, NOxemission is reduced by 40% to 60%, and low-carbon and low-NOx sintering is implemented.

Description

technical field [0001] The invention relates to an iron ore sintering method, in particular to a low-carbon and low-NOx sintering method based on a reasonable distribution of fuel, belonging to the field of iron and steel metallurgy. Background technique [0002] The iron and steel industry is a typical high energy consumption and high pollution industry. Iron ore sintering is the first high-temperature process of modern iron and steel smelting, and it is also a link of huge energy consumption and pollutant discharge. Energy consumption accounts for 9-12% of the total energy consumption in the iron and steel industry, of which 75-80% is consumed by solid fuels such as coke powder and anthracite, and the pollutant load is the first in all iron and steel smelting processes, reaching 39%, of which SOx, NOx, CO 2 The emissions of the three accounted for 10%, 70%, and 48% of the total emissions of the steel industry, respectively. Researches at home and abroad have shown that S...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/16C22B1/24
CPCC22B1/16C22B1/24
Inventor 季志云范晓慧赵元杰甘敏陈许玲黄晓贤袁礼顺张一雄肖恒曹风唐庆余汪国靖吕薇姜涛李光辉
Owner CENT SOUTH UNIV
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