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Chain grate machine-rotary kiln pellet process pre-desulfurization and denitrification method

A technology of desulfurization, denitrification, and rotary kiln, which is applied in the field of iron and steel metallurgy to achieve the effects of improving desulfurization efficiency, slowing down NH3 release, and strong thermal stability

Active Publication Date: 2020-07-28
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This application does not need to heat up the flue gas, which can save energy and improve the denitrification efficiency, but it does not involve the desulfurization function, and there is still room for further optimization

Method used

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  • Chain grate machine-rotary kiln pellet process pre-desulfurization and denitrification method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Such as figure 1 As shown, in the chain grate machine-rotary kiln pelletizing process of the present embodiment, the method for desulfurization and denitrification in advance, the drying I section 110 at the front end of the drying section 150 of the grate machine 100 adopts draft drying, and the source of hot air adopts preheating I section 130 and The mixed gas of the cooling section III section 330 of the ring cooler 300, the drying section II section 120 at the rear end of the drying section 150 is still dried by suction; and Ca is added during the preparation of green pellets. 2+ Chelate urea intercalated bentonite, install urea milling, storage, screw feeding and dry powder injection devices on the preheating II section 140 of the grate machine 100, and the injection device sprays urea powder into the preheating II section 140 to make the smoke The content of NOx and SOx in the air is significantly reduced.

[0042] In this embodiment, the chain grate machine-rot...

Embodiment 2

[0062] The chain grate machine-rotary kiln pelletizing process pre-desulfurization and denitrification method of this embodiment is basically the same as the above embodiment, the difference is that in this embodiment Ca 2+ The chelated urea intercalation bentonite comprises the following components in terms of mass percentage: 2.5wt.% urea, 2.5wt.% Ca(OH) 2 and 95wt.% bentonite, when prepared:

[0063] P2. Stir and heat the mixed solution at a constant temperature for 3 hours at 100°C;

[0064] P3, the quality of adding bentonite to the above melt is Ca(OH) 2 and 19 times the mass sum of urea, and add 8wt.% water by mass percentage, and then stir evenly;

[0065] P4. Place the mixture at room temperature for 10 hours, then place it in a microwave heating furnace with the temperature controlled at 80°C, heat for 2 hours, and then finely grind the agglomerated material to a particle size of less than 0.074mm and a content of ≥95wt.%.

[0066] When using, add 1.0wt.% Ca durin...

Embodiment 3

[0068] The chain grate machine-rotary kiln pelletizing process pre-desulfurization and denitrification method of this embodiment is basically the same as the above embodiment, the difference is that in this embodiment Ca 2+ The chelated urea intercalated bentonite comprises the following components in terms of mass percentage: 10wt.% of urea, 10wt.% of Ca(OH) 2 and 80wt.% bentonite, when prepared:

[0069] P2. Stir and heat the mixed solution at a constant temperature for 0.5h at 120°C;

[0070] P3, the quality of adding bentonite to the above melt is Ca(OH) 2 and 4 times the mass sum of urea, and add 5wt.% water by mass percentage, and then stir evenly;

[0071] P4. Put the mixture at room temperature for 14 hours, then place it in a microwave heating furnace, control the temperature at 100°C, heat it for 0.5 hours, and then finely grind the agglomerated material to a particle size of less than 0.074mm and the content is ≥95wt.%.

[0072] When using, add 4.0wt.% Ca during ...

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Abstract

The invention discloses a chain grate-kiln pelletizing process pre-desulfurization and pre-denitrification method and belongs to the field of steel and iron metallurgy. According to the method, a drying section I of a chain grate machine conducts drying through air extraction, an air mixture of a preheating section I and a cooling section III of a ring cooler serves as a hot air source, and an airdraft drying section II conducts drying still through air extraction; Ca<2+> chelation urea intercalated bentonite is added in the fresh pellet preparation process, a urea spraying device is arrangedon a preheating section II of the chain grate machine, and urea powder is sprayed so as to obviously reduce the NOx content and the Sox content. The method is provided for solving the conditions thata chain grate-kiln pelletizing flue gas desulfurization system under the new environmental protection standards are generally sufficient in capacity and does not conduct flue gas desulfurization yet.The Ca<2+> chelation urea intercalated bentonite is added in the fresh pellet preparation process. The urea powder is cooperatively sprayed at the preheating section II of the chain grate machine. Bycontrolling the additive amount of the Ca<2+> chelation urea intercalated bentonite and the spray amount of the urea powder, the desulfurization and denitrification effects can be controlled flexibly.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, and more specifically, relates to a method for pre-desulfurization and denitrification in the chain grate machine-rotary kiln pellet process. Background technique [0002] Pellets are one of the commonly used iron-containing charges for blast furnace smelting. Acidic pellets combined with high-basicity sinter are currently the mainstream charge structure for blast furnaces in key enterprises in my country. The grate-rotary kiln method is the mainstream method for the production of oxidized pellets in my country, and plays an important role in the blast furnace charge preparation process. [0003] SO 2 It is one of the main air pollutants. It will be oxidized in the atmosphere to generate sulfuric acid mist or sulfate aerosol, which is an important precursor of environmental acidification. The concentration of sulfur dioxide in the atmosphere above 0.5ppm has a potential impact...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/20C22B1/216C22B1/24
CPCC22B1/20C22B1/216C22B1/2406
Inventor 龙红明余正伟春铁军孟庆民张中武任志祥钱立新狄瞻霞魏汝飞王平向爱平王毅璠罗云飞章裕东
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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