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A kind of premix for reducing nitrogen oxide emission, its production method and sintered material

A technology for nitrogen oxides and a production method, which is applied to the fields of pre-batches for reducing nitrogen oxide emissions, a production method thereof, and sintered materials, can solve problems such as less obvious effects, and achieves simple process, convenient industrial production, and easy operation. Effect

Active Publication Date: 2022-04-15
SHANDONG TAISHAN STEEL GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional method of reducing nitrogen oxide emissions through raw material control in the batching stage, such as controlling the particle size of raw materials, maintaining accurate water addition, adding certain inhibitors, changing the order of addition, etc., generally reduces the concentration of nitrogen oxides in flue gas after combustion to about 450 mg / m3, the effect it brings is not obvious, and it is difficult to effectively solve the problem of reducing the emission of nitrogen oxides during the sintering process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The pre-mixture for reducing nitrogen oxide emissions is characterized in that it consists of coke with a particle size of 1.5-2.5mm, iron ore powder with a particle size below 2.5mm and quicklime with a particle size below 1mm in a mass ratio of 2.5: 1.5:1, prepared by adding water and mixing evenly.

[0020] The above-mentioned production method for reducing nitrogen oxide emissions is characterized in that it comprises the following steps:

[0021] (1), material preparation: crush quicklime to less than 1mm to obtain quicklime with a particle size of less than 1mm, and place it for use; crush iron ore powder through a 60-mesh sieve to obtain iron ore powder with a particle size of less than 2.5mm. Place it for use; after crushing and sieving the coke, take the coke with a particle size of 1.5-2.5 mm to prepare coke with a particle size of 1.5-2.5 mm for sintering, and place it for use;

[0022] (2) After mixing coke with a particle size of 1.5-2.5mm and quicklime wi...

Embodiment 2

[0032] The pre-mixture for reducing nitrogen oxide emissions is characterized in that it consists of coke with a particle size of 1.5-2.5 mm, iron ore powder with a particle size of 2.5 mm or less and quicklime with a particle size of 1 mm or less in a mass ratio of 5: 2:1, add water and mix evenly.

[0033] The above-mentioned production method for reducing nitrogen oxide emissions is characterized in that it comprises the following steps:

[0034] (1), material preparation: crush quicklime to less than 1mm to obtain quicklime with a particle size of less than 1mm, and place it for use; crush iron ore powder through a 60-mesh sieve to obtain iron ore powder with a particle size of less than 2.5mm. Place it for use; after crushing and sieving the coke, take the coke with a particle size of 1.5-2.5 mm to prepare coke with a particle size of 1.5-2.5 mm for sintering, and place it for use;

[0035] (2) After mixing coke with a particle size of 1.5-2.5mm and quicklime with a part...

Embodiment 3

[0045] The pre-mixture for reducing nitrogen oxide emissions is characterized in that it consists of coke with a particle size of 1.5-2.5 mm, iron ore powder with a particle size of 2.5 mm or less and quicklime with a particle size of 1 mm or less in a mass ratio of 3: 1.7:1, prepared by adding water and mixing evenly.

[0046] The above-mentioned production method for reducing nitrogen oxide emissions is characterized in that it comprises the following steps:

[0047] (1), material preparation: crush quicklime to less than 1mm to obtain quicklime with a particle size of less than 1mm, and place it for use; crush iron ore powder through a 60-mesh sieve to obtain iron ore powder with a particle size of less than 2.5mm. Place it for use; after crushing and sieving the coke, take the coke with a particle size of 1.5-2.5 mm to prepare coke with a particle size of 1.5-2.5 mm for sintering, and place it for use;

[0048] (2) After mixing coke with a particle size of 1.5-2.5mm and q...

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Abstract

The invention discloses a pre-batch for reducing the emission of nitrogen oxides, its production method and sintering material, which is characterized in that it is composed of coke for sintering, iron ore powder for sintering, quicklime for sintering and a material for reducing the emission of nitrogen oxides The pre-batch is made by mixing uniformly according to the mass ratio of 5:100: (5-10): (10-20); the pre-batch for reducing nitrogen oxide emissions is composed of coke with a particle size of 1.5-2.5mm, The iron ore powder with a particle size below 2.5mm and the quicklime with a particle size below 1mm are prepared by adding water and mixing uniformly according to the mass ratio (2.5-5): (1.5-2):1. The sintered material prepared by the invention can be fully burned to reduce the concentration of nitrogen oxides in the flue gas to about 350 mg / m3; the process is simple, easy to operate, convenient for industrial production, and the structure of the sintered material is stable.

Description

technical field [0001] The invention relates to an improvement of a sintered material in the iron and steel industry, in particular to a pre-mixture for reducing nitrogen oxide emissions, a production method thereof and a sintered material. Background technique [0002] The sintering process is an important branch of the iron and steel industry. The existing sintering material is made of powdered iron ore powder, quicklime and coke. The particle size of the powder is required to be below 8mm, and the particle size of quicklime for sintering is required to be below 2mm. After mixing evenly to make sintered material, place it on the sintering trolley, and generate massive sintered ore with certain metallurgical properties through combustion. In this sintering process A large amount of flue gas will be produced in the flue gas. The concentration of nitrogen oxides in the flue gas is basically about 500 mg / m3. Nitrogen oxides are the most polluting substances, most of which are ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/16
CPCC22B1/16
Inventor 郭会良吴月龙宋文红谷璐璐何敏李铁
Owner SHANDONG TAISHAN STEEL GROUP
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