Chain grate-kiln pelletizing process pre-desulfurization and pre-denitrification method

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

Active Publication Date: 2019-02-22
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 ef

Method used

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  • Chain grate-kiln pelletizing process pre-desulfurization and pre-denitrification method

Examples

Experimental program
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Example Embodiment

[0040] Example 1

[0041] Such as figure 1 As shown, the pre-desulfurization and denitrification method of the grate machine-rotary kiln pelletizing process of this embodiment uses the drying section 110 at the front end of the drying section 150 of the grate machine 100 to be dried by suction, and the hot air source uses the preheating section 130 and The mixed gas in the III section 330 of the ring cooler 300 is cooled, and the drying section 120 at the rear end of the drying section 150 is still dried by suction; and Ca is added during the green ball preparation process 2+ Chelated urea intercalated bentonite, urea grinding, storage, screw feeding and dry powder injection device are set on the preheating section 140 of the grate 100, and the blowing device sprays the urea powder into the preheating section 140 to make smoke The NOx and SOx content in the gas is significantly reduced.

[0042] In this embodiment, the chain grate machine-rotary kiln pellet production system inclu...

Example Embodiment

[0061] Example 2

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

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

[0064] P3. The quality of bentonite added to the above melt is Ca(OH) 2 19 times the sum of urea and 8wt.% of water, and then mix well;

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

[0066] When in use, add 1.0wt.%Ca during the preparation of the green ball 2+ Chelat...

Example Embodiment

[0067] Example 3

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

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

[0070] P3. The quality of bentonite added to the above melt is Ca(OH) 2 4 times the sum of urea and 5wt.% of water, and then mix well;

[0071] P4. Place 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 a content of ≥95wt.%.

[0072] When in use, add 4.0wt.%Ca during the preparation of the green ba...

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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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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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