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Method for loading raw materials into blast furnace

A blast furnace and raw material technology, which is applied in the field of blast furnace raw material loading, can solve the problems of great influence on air permeability and limitation of blast furnace productivity, and achieve the effect of efficient reduction

Active Publication Date: 2020-11-20
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The air permeability of the molten zone has a great influence on the air permeability of the blast furnace as a whole, which limits the productivity in the blast furnace

Method used

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  • Method for loading raw materials into blast furnace
  • Method for loading raw materials into blast furnace
  • Method for loading raw materials into blast furnace

Examples

Experimental program
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Effect test

Embodiment

[0058] Loading tests of ore (x) and low-reactivity ore (y) were carried out using a model test device on a scale of 1 / 20. Figure 9 is a schematic diagram of a model test device used in Examples. A flow control valve (not shown) is provided at the discharge port of the sub-hopper of the model test device so that the discharge rate of the low-reactivity ore (y) can be controlled.

[0059]As the ore (x), an ore (sintered ore) with a JIS reduction rate (RI) of 65% was used, and as the low-reactivity ore (y), an ore (lump ore) with a JIS reduction rate (RI) of 50% was used. As the coke, common coke was used. In the invention example, the ore (x) is put into the main hopper, the low-reactivity ore (y) is put into the sub-hopper, and the low-reactivity ore is discharged from the sub-hopper during a part of the discharge period when the ore (x) is discharged from the main hopper (y). On the other hand, in the comparative example, according to the conventional method, only the main...

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Abstract

Provided is a method for loading raw materials into a blast furnace that makes it possible to efficiently reduce low-reactivity ore and to effectively stabilize the reduction state of ore within a furnace even when normal coke is used in a blast furnace comprising a bell-less loading device. The method is for loading raw materials into a blast furnace provided with a bell-less loading device thatcomprises a plurality of main hoppers at the furnace top and an auxiliary hopper having a smaller capacity than the main hoppers. When ore (x) that has a JIS reduction rate (RI) greater than 55% and that is loaded into one or more of the plurality of main hoppers is discharged and sequentially loaded from a furnace center side to a furnace wall side by a rotating chute, only ore (x) is loaded fromthe rotating chute after starting loading of the ore (x) until loading of at least 45 mass% of the total amount of the ore (x) to be loaded in one batch is completed, the discharge of low-reactivityore (y) that has a JIS reduction rate (RI) of 55% or less and that has been loaded into the auxiliary hopper is subsequently started from a discretionary point in time, and ore (x) and low-reactivityore (y) are subsequently loaded from the rotating chute during a discretionary period.

Description

technical field [0001] The invention relates to a raw material charging method for a blast furnace with a bellless charging device. Background technique [0002] In recent years, from the viewpoint of preventing global warming, reduction of CO 2 . In the steel industry, CO 2 About 70% of the emissions are generated by blast furnaces, requiring reduction of CO in blast furnaces 2 discharge volume. CO in blast furnace 2 Reduction can be achieved by reducing reducing materials such as coke, finely powdered coal, and natural gas used in blast furnaces. [0003] On the other hand, in the case of reducing reducing materials, especially coke, since the coke ensuring the ventilation in the furnace decreases, the ventilation resistance in the furnace increases. In a normal blast furnace, when the ore charged from the top of the furnace reaches the temperature at which softening begins, it deforms while filling the voids due to the own weight of the raw material existing above. ...

Claims

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Application Information

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IPC IPC(8): C21B5/00C21B7/18C21B7/20F27B1/20F27D3/10
CPCF27D3/10F27B1/20C21B7/20C21B5/008F27D3/0033Y02P10/20C21B5/00
Inventor 市川和平小笠原泰志佐藤健
Owner JFE STEEL CORP