Mixing method for reducing emission of NOX in sintering process

A technology of sintering process and sintering mixture, which is applied in the field of pollutant emission reduction in the sintering process, which can solve the problems of limited nitrogen oxide treatment effect and difficulty in effectively controlling the emission reduction of nitrogen oxides in sintering flue gas, so as to reduce the content of NOX , Yield rate and utilization coefficient improvement, strengthen the effect of mixing effect

Inactive Publication Date: 2018-11-16
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Claims
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Problems solved by technology

[0007] The present invention aims at the problem that the existing treatment effect of nitrogen oxides is limited, and it is difficult to effectively control the emission reduction of nitrogen oxides in sintering flue gas, and provides a method for reducing NO emission in the sintering process. X Mixing method, by changing the mixing method to promote the production of calcium ferrite, calcium ferrite can affect the NO produced by fuel combustion X react with CO to form N 2 The reaction has a catalytic effect, so as to achieve the control of sintering flue gas NO X emission effect

Method used

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  • Mixing method for reducing emission of NOX in sintering process
  • Mixing method for reducing emission of NOX in sintering process
  • Mixing method for reducing emission of NOX in sintering process

Examples

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Embodiment 1

[0042] Such as figure 1 As shown, a method of the present invention for reducing NO emission in the sintering process X The material mixing method is characterized in that: mixing iron ore powder with a calcium ferrite generating capacity greater than 60% with fuel and flux, and granulating to obtain a fuel-containing mixture, and mixing and granulating the rest of the iron-containing raw materials and flux A fuel-free mixture is obtained; and the fuel-containing mixture is mixed with the fuel-free mixture to obtain a split granulation sintering mixture.

[0043] Wherein, calcium ferrite is selected to generate iron ore powder with a mass percentage greater than 60%, and the above-mentioned iron ore powder is mixed with fuel and flux to obtain a fuel-containing mixture, and then the fuel-containing mixture is mixed with the remaining iron-containing raw materials and flux Mixing is carried out to obtain a sintered mixture. Choosing iron ore powder with strong calcium ferrite...

Embodiment 2

[0054] Such as figure 2 As shown, the basic content of this embodiment is the same as that of Embodiment 1, the difference is: S11: Select iron ore powder with a mass percentage of calcium ferrite greater than 60%, add fuel and flux to the mixer for one mixing, after the first mixing is completed Then add it to the mixer for secondary mixing to obtain Mixture A; S12: Put the remaining iron-containing raw materials and flux into the mixer for primary mixing to obtain Mixture B; finally, divide and granulate Mixture A and Mixture B Add it into the mixer and mix it three times to get the sintered mixture. Among them, the first mixing time is 2-3 minutes, preferably 2 minutes in this embodiment, the second mixing time is 0-1 min, preferably 1 minute in this embodiment, and the mixing and granulation S20 time is 5-7 minutes, preferably 6 minutes in this embodiment. Compared with Example 1, this embodiment adds a mixing step in the selective split mixing S10 to enhance the mixing ...

Embodiment 3

[0057] Such as image 3 As shown, the basic content of this embodiment is the same as that of Embodiment 1, the difference being: S10: Selective shunting and mixing S11: Select calcium ferrite to generate iron ore powder with a mass percentage greater than 60%, and the above-mentioned iron ore powder, return The ore, fuel and flux are added into the mixer for mixing to obtain the mixture A; the selected particles of the returned ore are 3-5mm returned ore, and the above-mentioned returned ore is finely ground to obtain less than 100 mesh, and the returned ore quality accounts for 5-15% of the fuel mass, preferably 10% in this embodiment. In this implementation, the above-mentioned materials are added in the order of fuel, return ore, flux and iron ore powder when they are added to the mixer.

[0058] The emission reduction efficiency of nitrogen oxides in this embodiment is 23.35%, and the drum strength of sintered ore is 65.94%, the yield is 80.89%, and the utilization facto...

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Abstract

The invention discloses a mixing method for reducing emission of NOX in a sintering process, and belongs to the technical field of reduction of pollutant emission in the sintering process. Iron ore powder with the calcium ferrite generation mass percentage of more than 60% is selected; the iron ore powder is mixed with fuels and fluxes to obtain fuel-contained mixtures; and the fuel-contained mixtures are mixed with remained iron-contained raw materials and the fluxes to obtain sintering mixtures. NO released by combustion of the fuels in the sintering process is wrapped by calcium ferrite; the calcium ferrite achieves a catalysis effect on reduction of NO as N2, so that the generation of sintering NOx is reduced; and on the other hand, the fuels are wrapped by iron ores and quick lime toinhibit generation of NOX during sintering. The generation of NOX in the sintering and mixing process can be reduced, so that the emission reducing pressure in sintering smoke denitration is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of pollutant emission reduction in the sintering process, and more specifically, relates to a NO emission reduction method used in the sintering process. X Mixing method. Background technique [0002] NO X It is one of the main causes of acid rain, and it can also cause photochemical smog, which has a strong poisonous effect on the human body. And the steel industry NO X The emissions account for about 10% of the total industrial emissions, of which the sintering process is the production of NO X One of the main sources of NO X About 50% of the total. On January 1, 2015, NO X New emission standards have been implemented in existing enterprises, and the sintering process is facing huge NO X pressure to reduce emissions. [0003] The current traditional NO X The emission reduction method is mainly terminal treatment. The selective catalytic reduction denitrification process (SCR) works at a temperatur...

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 春铁军穆固天朱梦飞龙红明魏军赵丹宁周笛
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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