Nitric oxide (NOx) control method based on inhibiting fuel nitrogen conversion during iron ore sintering process

A technology of sintering process and control method, applied in the field of iron and steel metallurgy, can solve the problems of increasing the cost of additives, unsatisfactory emission reduction efficiency, affecting the quality indicators of sintered minerals, etc. beneficial effect

Active Publication Date: 2016-05-04
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, studies have shown that the above technologies will not only affect the quality indicators of sintered ore products

Method used

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  • Nitric oxide (NOx) control method based on inhibiting fuel nitrogen conversion during iron ore sintering process

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Effect test

Embodiment 1

[0021] A kind of NOx control method based on suppressing iron ore sintering process fuel nitrogen conversion of the present invention comprises the following steps:

[0022] (1) Firstly, sieve out -1mm sintered return ore;

[0023] (2) Weigh the coke powder, and add the -1mm sintered ore sieved in step (1) into the coke powder (the quality of the -1mm sintered ore is 1.5 times the quality of the coke powder); 20% of hematite concentrate is added (the mass content of -0.074mm concentrate in hematite concentrate accounts for 75%, and SiO in hematite concentrate 2 Content is 4%) mixing; adding quicklime to adjust the alkalinity of the mixture composed of fine-grained hematite and quicklime to be 2.4; finally add sucrose (the addition of sucrose is between the quality of coke powder, -1mm sintered return ore and hematite concentrate and 0.3%), carry out pre-granulation in the cylinder mixer after the above material batching, obtain the pre-granulation mixture;

[0024] (3) Perfo...

Embodiment 2

[0027] A kind of NOx control method based on suppressing iron ore sintering process fuel nitrogen conversion of the present invention comprises the following steps:

[0028] (1) Firstly, sieve out -1mm sintered return ore;

[0029] (2) Weigh the coke powder, and add the -1mm sintered ore sieved out in step (1) into the coke powder (the quality of the -1mm sintered ore is 3.0 times the quality of the coke powder); 40% of hematite powder ore is added (the quality content of -0.5mm powder ore in hematite powder ore accounts for 60%, and SiO in hematite powder ore 2content of 6.0%); add quicklime to adjust the alkalinity of the mixture composed of fine-grained hematite and quicklime to be 2.0; finally add starch (the amount of starch added is equal to the quality of coke powder, -1mm sintered return ore and hematite powder ore) and 0.2%), carry out pre-granulation in the cylinder mixer after the above material batching, obtain the pre-granulation mixture;

[0030] (3) Perform co...

Embodiment 3

[0033] A kind of NOx control method based on suppressing conversion of fuel nitrogen in sintering process of the present invention comprises the following steps:

[0034] (1) Firstly, sieve out -1mm sintered return ore;

[0035] (2) Weigh the coke powder, and add the -1mm sintered ore sieved in step (1) into the coke powder (the quality of the -1mm sintered ore is 2.5 times the quality of the coke powder); 30% of hematite powder ore is added (the quality content of -0.5mm powder ore in hematite powder ore accounts for 55%, and SiO in hematite powder ore 2 content of 5.0%); add quicklime to adjust the alkalinity of the mixture composed of fine-grained hematite and quicklime to be 2.2; finally add Palido (the addition amount of Palido is coke powder, -1mm sintered return ore and hematite powder ore 0.1% of the sum of the mass), the above materials are pre-granulated in a drum mixer after batching to obtain a pre-granulated mixture;

[0036] (3) Perform conventional granulation...

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Abstract

The invention discloses a nitric oxide (NOx) control method based on inhibiting fuel nitrogen conversion during an iron ore sintering process. The method comprises the steps of screening particles less than 1mm from sinter return fines; after burdening the sinter return fines less than 1mm, fine hematite, quicklime, sinter fuel and hydrocarbon with cohesive action, performing prepelletisation of iron ore concentrate in a rotary drum mixer; performing pelletization on the obtained mixture, residual iron-bearing materials, solvents and the sinter return fines; laying out, igniting and sintering the obtained particles. By the method disclosed by the invention, emission reduction methods are respectively designed aiming at the conversions from volatile nitrogen and char nitrogen to NOx; through inhibiting the oxidizing reaction of fuel nitrogen (N) and promoting the reduction reaction of NOx, the emission of NOx during the sintering process is controlled; the method is strong in pertinence and good in emission reduction effect.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and in particular relates to a NOx control method based on inhibiting the conversion of fuel nitrogen in the iron ore sintering process. Background technique [0002] NOx (nitrogen oxides) is one of the main causes of photochemical smog and acid rain. The pollution caused by its emission seriously affects the ecological environment and endangers human health. At present, the most important NOx emissions in industry come from the combustion of fossil fuels (coal, oil, natural gas, etc.), and iron and steel enterprises are one of the important sources of NOx emissions, accounting for more than 10% of the national NOx emissions. In the sintering process, a large amount of coke powder, anthracite, etc. are consumed, and its NOx emissions account for 48% of the total emissions of iron and steel enterprises. The "Steel Sintering and Pelletizing Industry Air Pollutant Emission Standards" implem...

Claims

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Application Information

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IPC IPC(8): C22B1/16
CPCC22B1/16
Inventor 范晓慧甘敏吕薇陈许玲姜涛李光辉季志云周阳余志元何向宁袁礼顺郭宇峰杨永斌黄柱成李骞张元波朱忠平李强汪国靖田野
Owner CENT SOUTH UNIV
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