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A bell-less distribution method for blast furnace with stable forward motion

A blast furnace and cloth technology, which is applied to blast furnaces, blast furnace details, blast furnace parts, etc., can solve the problems of frequent air shutdowns, increasing the production cost of blast furnace ironmaking, and affecting airflow, etc.

Active Publication Date: 2016-01-20
INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this kind of operation concept that overemphasizes the two airflows tends to make the coke window in the middle part very thin, and the coke collapse caused by ore will push part of the coke to the center of the blast furnace, making the local coke window too narrow, especially in high output , the air volume is large, and when the ore batch is large, the amount of coke collapse will be aggravated
After the charge with a local coke window is too narrow falls to the soft melting zone, it will seriously affect the distribution of the air flow, which will deteriorate the air permeability of the entire blast furnace, the charge will not drop smoothly, the air flow distribution will be disordered, and the wind will be interrupted frequently, which will increase the ironmaking production of the blast furnace cost

Method used

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  • A bell-less distribution method for blast furnace with stable forward motion
  • A bell-less distribution method for blast furnace with stable forward motion
  • A bell-less distribution method for blast furnace with stable forward motion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1: Carry out the practice of protecting the weak zone in the middle of the coke layer on the cold cloth model.

[0037]

[0038]

[0039] The operating parameters of the blast furnace are set as: top gas flow rate 1.0m / s, coke batch 32t, ore batch 170t, material line 1.6m, based on the distribution matrix A of Shagang 5800 blast furnace in July 2013, optimize from A to F :

[0040] Gradually reduce the number of circles at the center and edge of the coke, for example, the 5 circles and 4 circles of the 1st and 2nd gears of the coke are reduced to 4 circles and 3 circles respectively, and the 12th gear of the coke is reduced from 3 circles to 2 circles;

[0041] Gradually spread the ore further, and gradually increase the ore from 5 stalls to 8 stalls;

[0042] Increase the number of turns of coke in the middle part, that is, increase the 4th, 5th, and 6th gears in the middle part from one turn to 3 turns each.

[0043] According to the matrix from A t...

Embodiment 2

[0044] Example 2: The practice of protecting the weak zone in the middle of the coke layer on Shagang 5800 blast furnace

[0045]

[0046] On July 23, 2013, Shagang 5800 blast furnace began to implement the cloth attempt to protect the weak zone in the middle of the coke layer. The operation from June 10, 2013 to July 22, 2013 was called the first stage. The September 12, 2013 operation was called phase two. And from June 10, 2013 to September 12, 2013, there was no significant change in the quality of raw materials and fuels, so the impact of changes in the quality of raw materials and fuels on blast furnace operation during this period can be ruled out, such as Figure 10 shown.

[0047] A typical cloth matrix for the first stage is The average coke batch is 30.1t, the average ore batch is 157.2t, the total number of coke turns is 22, the total number of ore turns is 22, and the top gas flow rate is 1.0m / s. It can be calculated from the cloth matrix setting that the m...

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Abstract

The invention discloses a bell-less material distributing method capable of ensuring stable running of a blast furnace. The material distributing method can protect a middle thin belt of a coke layer to prevent part of a coke window from being too narrow to effectively solve the problems of blast furnace gas turbulence and un-smooth charging falling, caused by over-narrow part of the coke window, thereby ensuring stable running of the blast furnace. According to the method, charging can fall stably, and the airflow distribution can be stable, so that the blast furnace can run stably for a long time, and ironmaking cost can be reduced.

Description

technical field [0001] The invention relates to a bellless material distribution method for a blast furnace with stable and forward movement, and belongs to the technical field of blast furnace material distribution. Background technique [0002] Blast furnace cloth plays a leading role in the entire blast furnace operation, and plays a key role in the stable forward movement of the blast furnace and the utilization of gas. Some blast furnace operators have summed up the operating concept of "no wind, no cure" in actual blast furnace production, that is, try to make the furnace receive more wind, and emphasize the operation idea of ​​taking into account the two airflows of "edge" and "center". Two channels are formed to allow the air flow to pass through, which is specifically manifested in: in the setting of the matrix, coke is "more at both ends and less at the middle", while ore is "more at the middle and less at both ends". Especially when the operation of the blast fur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B5/00C21B7/00
Inventor 赵华涛杜屏
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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