A NOx emission reduction method based on modified fuel iron ore sintering process

A sintering process and fuel technology, which is applied to fuels, solid fuels, fuel additives, etc., can solve the problems of reducing NOx emissions and low nitrogen oxide emission reduction efficiency, and achieve the effect of promoting effective reduction and improving catalytic effect.

Active Publication Date: 2021-09-17
LIUZHOU IRON & STEEL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A NOx emission reduction method based on modified fuel iron ore sintering process
  • A NOx emission reduction method based on modified fuel iron ore sintering process
  • A NOx emission reduction method based on modified fuel iron ore sintering process

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Embodiment 1

[0036] Such as 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 proces...

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 the iron ore sintering process based on modified fuel, and relates to the technical field of emission reduction of sintering pollutants. In the present invention, the sintered ore is first finely ground to obtain the sintered ore fine material, and then the sintered ore fine material is added to the fuel for dry mixing without adding water to obtain a modified fuel, and then the modified fuel is mixed with iron-containing The raw materials and flux are mixed and granulated to obtain the mixture, which is loaded on the trolley, and the mixture is ignited and ventilated for sintering; the invention fully dry-mixes the fine sintered ore and fuel to make it loose It is distributed around the fuel; NOx will be generated during the fuel combustion process, and the loosely distributed sinter fines can efficiently catalyze the reduction process of NOx, thereby realizing the efficient reduction of NOx emission during the iron ore sintering process.

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 Patents(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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