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An enhanced ammonia injection denitrification method based on the surface catalytic performance of iron ore pellets

A technology of surface catalysis and iron ore ball, which is applied in the field of iron and steel metallurgy pelletizing process and iron ore pellet flue gas denitration field, which can solve the problems of low efficiency of ammonia spraying and denitration.

Active Publication Date: 2021-05-14
ANSTEEL GRP MINING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the low efficiency of denitrification by spraying ammonia in the air drying section of the pellets, the purpose of the present invention is to provide an enhanced ammonia spray denitrification method based on the catalytic performance of the surface of iron ore pellets. The strong catalytic surface layer of the binder improves the catalytic performance of the pellet surface and increases the denitrification reaction surface, and enhances the denitrification efficiency of ammonia injection in the air drying section

Method used

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  • An enhanced ammonia injection denitrification method based on the surface catalytic performance of iron ore pellets
  • An enhanced ammonia injection denitrification method based on the surface catalytic performance of iron ore pellets

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Embodiment 1

[0045] The proportioning scheme of pelletizing raw materials of the present invention is that the ratio of iron concentrate A: iron concentrate B: iron concentrate C is 10:30:60, and iron concentrate A is a strong catalytic iron concentrate, and 6% of it is separated Iron concentrate A is used for pellet surface adhesion, and the remaining iron concentrate is prepared by adding 1.2% bentonite to the mixed iron concentrate after blending to prepare 12-16mm pellets, and then blended into the separated iron concentrate A Add 1.2% composite binder, the ratio of bentonite to polyvinyl alcohol in the composite binder is 98:2, add it to the large ball growth area of ​​the pelletizing disk, and adhere it to the pellet surface of 12-16mm , to form green pellets with a strong catalytic iron concentrate surface layer containing a composite binder; the grate machine-rotary kiln pellet production process is adopted, and the pipeline is set in the hood of the exhaust drying section at a temp...

Embodiment 2

[0047] The ratio of pellet raw materials is iron concentrate A: iron concentrate B: iron concentrate C ratio is 10:30:60, iron concentrate A is a strong catalytic iron concentrate, and 3% of the iron concentrate is separated Ore A is used for the adhesion of the surface layer of the pellets. After the remaining iron concentrate is blended, 1.2% bentonite is added to the mixed iron concentrate to prepare a 12-16mm pellet, and then 1.0% bentonite is added to the separated iron concentrate A. % Composite binder, the ratio of bentonite and polyvinyl alcohol in the composite binder is 95:5, and after mixing, add it to the large ball growth area of ​​the pelletizing disc to make it adhere to 12 -16mm pellet surface, forming green pellets with a strong catalytic iron concentrate surface layer containing a composite binder; the chain grate-rotary kiln pellet production process is adopted, and the smoke is smoked in the ventilation drying section at a temperature of 350°C A pipeline is...

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Abstract

The invention relates to an enhanced ammonia injection denitrification method based on the catalytic performance of the surface of iron ore pellets, which includes: the process of preparing green pellets by batching ingredients and the drying and preheating process of the chain grate, and the ammonia spray denitrification operation is arranged in the ventilation and drying section of the chain grate , is characterized in that: comprising the following steps: 1) determining the pellet raw material and the base binder; 2) preparing the composite binder; 3) preparing green balls with a strong catalytic surface containing the composite binder; 4 ) The surface layer of the pellets strengthens ammonia spray denitrification, the composite binder decomposes and volatilizes during the drying process to form rich pores on the surface layer of the pellets, increasing NH 3 And the adsorption of NOx on the surface layer of the pellets, the strong catalytic surface layer accelerates the speed of the denitrification reaction, and realizes the enhanced ammonia injection denitrification on the surface layer of the pellets. The invention has the advantages of: the denitrification rate is increased by more than 15 percentage points compared with the existing ammonia spray denitrification technology; it does not need to make major changes to the pelletizing process, only needs to make some improvements in the process of preparing green pellets from ingredients, and is easy to implement and popularize.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgical pellet technology, relates to the technical field of flue gas denitrification of iron ore pellets, and in particular relates to an enhanced ammonia injection denitrification method based on the surface catalytic performance of iron ore pellets. Background technique [0002] Nitrogen oxides (NOx) are the main substances that form acid rain, photochemical smog, haze weather and destroy the ozone layer, and their emissions pose a great threat to the ecological environment and human health. NOx emitted by the iron and steel industry accounts for 6% of the country's total emissions, and is an important source of air pollution. Iron ore sintering and pelletizing are the raw material processing links in the iron and steel process, and the flue gas NOx emitted ranks first among iron and steel enterprises, accounting for more than 50%. [0003] Pellets have many advantages such as hig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/242C22B1/216
CPCC22B1/216C22B1/2406C22B1/242
Inventor 朱德俊范晓慧陈许玲甘敏张海峰翁兴洋黄旭季志云
Owner ANSTEEL GRP MINING CO LTD
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