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Multifunctional additive for pulverized coal injected into blast furnace and multifunctional additive addition method

A multi-functional and additive technology, applied in blast furnaces, blast furnace details, furnaces, etc., can solve problems such as large addition, increased cost, and increased ash content of pulverized coal combustion

Inactive Publication Date: 2013-08-28
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patent has a large amount of addition, which will increase the cost and increase the ash content of pulverized coal combustion.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment one, 30% oxidizing agent (60%BaMnO 4 , 40%Fe(NO 3 ) 3 ), 30% catalyst (20%MnO 2 , 10%Co 3 o 4 , 15%CeO 2 , 35%Ca(OH) 2 , 10%MgO, 10%Fe 2 o 3 ), 35% combustion aid (charcoal), 5% passivator (50%B 2 o 3 , 50%CoCl 2 )

[0019] Embodiment two, 40% oxidizing agent (60%BaMnO 4 , 40%Fe(NO 3 ) 3 ), catalyst 30% (20%MnO 2 , 10%Co 3 o 4 , 15%CeO 2 , 35%Ca(OH) 2 , 10%MgO, 10%Fe 2 o 3 ), 25% combustion aid (charcoal), 5% passivation agent (50%B 2 o 3 , 50%CoCl 2 )

[0020] Embodiment three, 40% oxidizing agent (60%BaMnO 4 , 40%Fe(NO 3 ) 3 ), catalyst 40% (20%MnO 2 , 10%Co 3 o 4 , 15%CeO 2 , 35%Ca(OH) 2 , 10%MgO, 10%Fe 2 o 3 ), 15% combustion accelerant (charcoal), passivator 5% (50%B 2 o 3 , 50%CoCl 2 )

[0021] Embodiment four, 50% oxidizing agent (60%BaMnO 4 , 40%Fe(NO 3 ) 3 ), catalyst 30% (20%MnO 2 , 10%Co 3 o 4 , 15%CeO 2 , 35%Ca(OH) 2 , 10%MgO, 10%Fe 2 o 3 ), 15% combustion accelerant (charcoal), passivator 5% (50%B ...

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Abstract

The invention provides a multifunctional additive for pulverized coal injected into a blast furnace and a multifunctional additive addition method and belongs to the field of blast furnace iron making. The multifunctional additive is a powdery compound mixture, the particle size of the multifunctional additive is required to be larger than 100 meshes, and the proportion of the multifunctional additive with the particle size of above 200 meshes is required to account for above 80%. The multifunctional additive has the characteristics of being capable of obviously improving the combustion characteristic of the pulverized coal, reducing the ignition point, increasing the precipitation yield of volatiles, the combustion speed and the combustion heat, passivating the reaction activity of coke, reinforcing the supporting effect of a skeleton and inhibiting the low-temperature reduction degradation of iron-containing furnace burden. After 1%-6% of multifunctional additive is added to the pulverized coal injected into the blast furnace, the ignition point of the injected pulverized coal can be obviously reduced by 14 DEG C, the yield of the volatiles is increased by 23.38%, the combustion ratio of the pulverized coal is increased by 11.9%, the average reaction rate of the pulverized coal is increased by 8.7%, the low-temperature reduction degradation index (RDI) of sinters at 500 DEG C is increased by 23.10%, the coke reactivity (CRI) of the pulverized coal is reduced by 11.23%, and the post-reaction strength (CSR) of the pulverized coal is increased by 10.57%.

Description

Technical field: [0001] The invention is used to inject additives into blast furnaces to reduce coke and increase production, improve the quality of molten iron and smelting conditions, and belongs to the field of blast furnace ironmaking. Background technique: [0002] Entering the 21st century: cost reduction has become the theme of blast furnace ironmaking, the quality of ore powder has declined, the content of Al has increased, and the content of alkali metals has become higher and higher. However, the requirements for high coal ratio, low coke ratio, low fuel ratio, and blast furnace age have never been lowered, which put forward higher requirements for operators, and the quality of coke has also changed accordingly. [0003] Injecting pulverized coal to replace part of coke has become a conventional technology in ironmaking in my country. It plays an important role in saving coke and reducing consumption, adjusting furnace conditions, reducing pig iron costs, and reduc...

Claims

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Application Information

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IPC IPC(8): C21B5/00C10L9/10C10L9/12
Inventor 张建良郑常乐左海滨国宏伟祁成林王舜柴轶凡李峰光庞清海朱广跃
Owner UNIV OF SCI & TECH BEIJING
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