Emission reduction and device for NOx generated in sintering process

A technology of sintering process and conveying equipment, which is applied in the field of sintering emission reduction, can solve the problems of no process, no NOx emission reduction modification, treatment, etc., and achieve the effect of convenient implementation and reduction of NOx emission

Inactive Publication Date: 2019-03-15
ZENITH STEEL GROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Fuel separation and flux separation processes have also been mentioned at home and abroad, and there are also reports of fuel and flux separation and addition, such as the traditional sintering process (see figure

Method used

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  • Emission reduction and device for NOx generated in sintering process
  • Emission reduction and device for NOx generated in sintering process
  • Emission reduction and device for NOx generated in sintering process

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0029] Example 1:

[0030] In this embodiment, the mass ratio of coke powder 1 to coke powder 2 is 1:1, the mass ratio of white ash 1 to white ash 2 is 1:9, the mass ratio of coke powder 2 to white ash 2 is 4:1, and the mass ratio of coke powder 1 to white ash 2 is 4:1. The total mass of coke powder 2: the total amount of white ash 1 and white ash 2: limestone quality: dolomite quality: mixed ore quality: returned ore quality = 4:5:2:6:60:23. The residence time of the blend prepared in step (1) in the second mixing is 180s, that is, the second mixing granulation time is 240s, and the residence time of the spherical mixture prepared in step (2) in the secondary cylinder mixer For 30s. Finally, it will be sintered together with the rest of the materials. The NOx emission during the sintering process is 180mg / m 3 .

Example Embodiment

[0031] Example 2: In this example, the mass ratio of coke powder 1 to coke powder 2 is 0:1, the mass ratio of white ash 1 to white ash 2 is 1:9, and the mass ratio of coke powder 2 to white ash 2 is 8:1. The total mass of coke powder 1 and coke powder 2: the total amount of white ash 1 and white ash 2: limestone quality: dolomite quality: mixed ore quality: returned ore quality=4:5:2:6:60:23. The granulating time for the second mixing is 20s. Finally, it is sintered together with the rest of the materials, and the NOx emission during the sintering process is 160mg / m 3 .

Example

[0032] Comparative implementation 1:

[0033] see figure 1 , Adopting traditional sintering process, in which coke powder quality: white ash quality: limestone quality: dolomite quality: mixed ore quality: returned ore quality = 4:5:2:6:60:23, first mixing, second mixing and sintering process The same as in Example 1, the second-mix granulation time is 3 minutes, and the NOx emission during the final sintering process is 200mg / m 3 .

[0034] In the new process of reducing NOx sintering process, the above-mentioned embodiment has the advantage compared with the traditional sintering process in that it breaks the traditional process of mixing coke powder and white ash through one mixing and two mixing, and is also different from the fuel and flux separation process The two are added to the mixer state without distinction. In this new process, one is to ensure that the white ash is adhered to the surface of the coke powder, which is ensured by the strong mixing + disc pelletizing + a...

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Abstract

The invention discloses an emission reduction and device for a NOx generated in a sintering process. The method comprises the three main steps of material preparation, mixing and granulation and sintering. According to the NOx emission reduction scheme, a new coke powder bin and a new lime bin are built, coke powder and some lime do not pass through a coke powder bin and a lime bin of a traditional material preparation chamber, directly enter the new coke powder bin and the new lime bin, enter a strong mixing machine to be mixed evenly, and are pelletized in a pelletizing disc to form a mixture, and the mixture is transferred into the certain position in a secondary cylinder mixing machine. By means of the emission reduction and device for the NOx generated in the sintering process, the purpose that NOx generated in the sintering process is reduced is achieved by adjusting the wrapping state of coke powder without greatly changing the current sintering technology.

Description

technical field [0001] The invention belongs to the field of sintering emission reduction, in particular to a method and equipment for reducing NOx emission in a sintering process. Background technique [0002] In the iron and steel industry, sintering is a major pollutant emitter, and NOx emitted by sintering accounts for 50% of the total emissions of the iron and steel industry. In recent years, with the country's gradual emphasis on sintering environmental protection, environmental protection standards have gradually tightened, especially for NOx, from <300mg / Nm3 in the national standard in 2012, to <50mg / Nm3 in 2018 for ultra-low emission drafts. This brings great challenges to the sinter plant. Many enterprises have begun to invest in SCR, activated carbon or oxidation to denitrify processes, which are all terminal treatments, and the input costs are relatively high. 90% of the NOx emission in the sintering process is brought by the coke powder, that is, fuel-ty...

Claims

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Application Information

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IPC IPC(8): C22B1/16C22B1/24
CPCC22B1/16C22B1/2406
Inventor 裴元东张俊杰陈军召管振列殷国富周翔周晓冬李国良盛建华赵和平江银伟
Owner ZENITH STEEL GROUP CORP
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