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A sintering method for controlling the emission concentration of nitrogen oxides in the sintering process

A technology of nitrogen oxides and emission concentration, applied in the field of sintering, can solve the problem of poor effect of NOx emission reduction, achieve the effect of reducing NOx emission and meeting environmental protection requirements

Active Publication Date: 2020-05-05
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Disadvantages of flue gas circulation: it requires a large renovation project, and mainly affects SO 2 Plays a certain role in emission reduction, but has a poor effect on NOx emission reduction

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A kind of sintering method of controlling sintering process nitrogen oxide emission concentration, its step:

[0045] 1) Separation of fuel particle size: sieve the fuel, and screen out two grades of ≤0.5mm particle size and larger than 0.5 to 10mm particle size; record the weight M of the ≤0.5mm particle size fuel and the particle size greater than 0.5 to 10mm The weight N of particle size fuel; M is 148Kg, and N is 294 Kg; Stand-by

[0046] 2) Split the fuel:

[0047] A. Mix ≤0.5mm particle size fuel, quicklime and iron ore powder, and mix according to the ratio of ≤0.5mm particle size fuel: quicklime: iron ore powder=a:b:c=1:0.5:3, and stir The time is 2.5min. After mixing, it will be sent to the corresponding batching bin;

[0048] In the formula: a—represents the participation ratio of fuel with particle size ≤0.5mm, which is taken as 1;

[0049] b—represents the participation ratio of quicklime, which is taken as 0.5;

[0050] c—indicates the participation rat...

Embodiment 2

[0071] A kind of sintering method of controlling sintering process nitrogen oxide emission concentration, its step:

[0072] 1) Separation of fuel particle size: sieve the fuel, and screen out two grades of ≤0.5mm particle size and larger than 0.5 to 10mm particle size; record the weight M of the ≤0.5mm particle size fuel and the particle size greater than 0.5 to 10mm Grain fuel weight N; M is 0.81Kg, N is 2.07Kg; Standby

[0073] 2) Split the fuel:

[0074] A. Mix ≤0.5mm particle size fuel, quicklime and iron ore powder, and mix according to the ratio of ≤0.5mm particle size fuel: quicklime: iron ore powder=a:b:c=1:0.3:2, and stir The time is 2.5min. After mixing, it will be sent to the corresponding batching bin;

[0075] In the formula: a—represents the participation ratio of fuel with particle size ≤0.5mm, which is taken as 1;

[0076] b—represents the participation ratio of quicklime, which is taken as 0.3;

[0077] c—indicates the participation ratio of iron ore powd...

Embodiment 3

[0098] A kind of sintering method of controlling sintering process nitrogen oxide emission concentration, its step:

[0099] 1) Separation of fuel particle size: sieve the fuel, and screen out two grades of ≤0.5mm particle size and larger than 0.5 to 10mm particle size; record the weight M of the ≤0.5mm particle size fuel and the particle size greater than 0.5 to 10mm The weight N of particle size fuel; M is 1.03Kg, and N is 2.94 Kg; stand-by

[0100] 2) Split the fuel:

[0101] A. Mix the ≤0.5mm particle size fuel, quicklime and iron ore powder, and mix according to the ratio of ≤0.5mm particle size fuel: quicklime: iron ore powder=a:b:c=1:1:3, and stir The time is 2.5min. After mixing, it will be sent to the corresponding batching bin;

[0102] In the formula: a—represents the participation ratio of fuel with particle size ≤0.5mm, which is taken as 1;

[0103] b—indicates the participation ratio of quicklime, take 1;

[0104] c—indicates the participation ratio of iron o...

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PUM

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Abstract

The invention discloses a sintering method for controlling the emission concentration of nitric oxide (NOx) in the sintering process. The sintering method comprises the steps of size fraction separation of fuel, flow dividing of the fuel, dosing and conventional sintering. Technological conditions are appropriately improved under the existing sintering technological conditions, that is, the fine-size-fraction fuel, with the size fraction being smaller than or equal to 0.5 mm, with good reactivity is independently treated, then a sintered mixture is dosed, thus reactivity of the fuel can be lowered, the conversion rate of the NOx is controlled, the concentration of the NOx in iron ore sintered flue gas is controlled, thus the NOx emitted into the atmosphere can be reduced by 15% or above, NOx emission can be effectively reduced by 30% or above, and the requirements of environmental protection can be met without flue gas denitrification end treatment equipment.

Description

technical field [0001] The invention relates to a sintering method, which specifically belongs to a sintering method for controlling the emission concentration of nitrogen oxides in the sintering process. Background technique [0002] With the increasingly stringent national NOx concentration standards for flue gas emissions from the sintering pellet industry, it is imminent to solve the problem of nitrogen oxide emissions from sintering flue gas. Through literature search, it is known that the current sintering industry mainly focuses on flue gas treatment and reduction of flue gas treatment volume for NOx emission reduction. In the separate denitrification process for flue gas, there are mainly selective catalytic reduction flue gas denitration technology (SCR) and selective non-catalytic reduction flue gas denitrification technology (SNCR). The desulfurization and denitrification integrated technology can be divided into two categories according to the different removal ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F27D19/00
CPCF27D19/00F27M2003/04
Inventor 李军史先菊王素平
Owner 武汉钢铁有限公司