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Method for reducing NOx emission in iron ore sintering process based on modified fuel

A sintering process and fuel technology, applied in fuel, solid fuel, fuel additives, etc., can solve the problems of low nitrogen oxide emission reduction efficiency, reduce NOx emissions, etc., and achieve the effect of promoting effective reduction

Active Publication Date: 2019-01-22
LIUZHOU IRON & STEEL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a method for reducing NOx emissions in the sintering process based on modified fuel iron ore for the low efficiency of nitrogen oxide emission reduction in the sintering process in the prior art; The fuel is dry-blended to prepare a modified fuel, which can effectively reduce NOx emissions by mixing the modified fuel into the sinter mixture

Method used

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  • Method for reducing NOx emission in iron ore sintering process based on modified fuel
  • Method for reducing NOx emission in iron ore sintering process based on modified fuel
  • Method for reducing NOx emission in iron ore sintering process based on modified fuel

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Embodiment 1

[0036] like figure 1 Shown, a kind of NOx emission reduction method based on modified fuel iron ore sintering process of the present invention, the steps are:

[0037] (1) Sinter fine grinding

[0038] Finely grind the sintered ore to obtain fine sintered ore; the specific steps are: select the sintered ore with a particle size greater than 5mm, add the sintered ore to the crusher for crushing, and finely grind the sintered ore after the crushing is completed, so that after fine grinding The particle size of the sintered ore is less than 0.5mm;

[0039] (2) Fuel modification treatment

[0040] Add the sintered ore fine material into the fuel for dry mixing without adding water to prepare the modified fuel; the specific steps are: under dry conditions, first add the fuel into the mixer, and then add the sintered ore The fine material is added in the fuel, and the sinter fine material and the fuel are dry mixed, and the addition of water is avoided during the mixing process, ...

Embodiment 2

[0047] The basic content of this embodiment is the same as that of Embodiment 1, except that the sintered ore with a particle size greater than 8 mm is selected for fine grinding, and the sintered ore used in this embodiment is +8 mm blast furnace return ore.

[0048] Put the mixed material on the trolley, ignite the mixed material, ventilate and sinter, and detect the NO in the sintering flue gas in the main sintering flue gas pipeline X content, and recorded as shown in Table 2.

Embodiment 3

[0050] The basic content of this embodiment is the same as that of Embodiment 1, except that the sintered ore with a particle size greater than 15 mm is selected for fine grinding, and the sintered ore used in this embodiment is the sintered bottoming material.

[0051] Put the mixed material on the trolley, ignite the mixed material, ventilate and sinter, and detect the NO in the sintering flue gas in the main sintering flue gas pipeline X content, and recorded as shown in Table 2.

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Abstract

The invention discloses a method for reducing NOx emission in an iron ore sintering process based on a modified fuel, and relates to the technical field of emission reduction of sintering pollutants.The method comprises the steps: firstly, finely grinding a sintered ore to a fine sintered ore material, then adding the fine sintered ore material to a fuel without addition of water, and carrying out dry mixing to produce the modified fuel; then mixing the modified fuel with an iron-containing raw material and a flux, and granulating to obtain a mixture; and laying the mixture on a trolley, andcarrying out ignition and air extraction sintering of the mixture. Through full dry mixing of the fine sintered ore material and the fuel, the fine sintered ore material is loosely distributed aroundthe fuel; NOx can be produced in the process of fuel combustion, the loosely distributed fine sintered ore material can highly efficiently catalyze the reduction process of NOx, and the highly efficient emission reduction of NOx in the iron ore sintering process is achieved.

Description

technical field [0001] The invention relates to the technical field of emission reduction of sintering pollutants, in particular to a method for reducing NOx emission in the sintering process of iron ore based on modified fuel. Background technique [0002] Steel is currently the most widely used metal material, and global steel production is also on the rise. In 2017, global crude steel production reached 1.69 billion tons. However, while the global steel production continues to grow, the environmental hazards caused by the steel production process cannot be ignored, and the current situation of NOx emissions in the steel industry is particularly severe. The emission of a large amount of NOx is an important reason for the formation of photochemical smog and acid rain, which has caused very serious harm to the ecological environment and the health of the people. According to statistics, the emission of NOx gas in the iron and steel industry accounts for about 10% of the tot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L9/10C10L10/02
CPCC10L9/10C10L10/02
Inventor 阮志勇春铁军王子宏龙红明谢运强余正伟甘牧原刘华陈阳吴丹伟向小平莫龙桂韦振宁梁杰群潘晶
Owner LIUZHOU IRON & STEEL
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