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Method for reducing shutdown knock of lowering charge level of blast furnace

A technology for lowering material surface and blast furnace, applied in blast furnace, blast furnace details, furnace, etc., can solve the problems of furnace wall refractory falling off, formation of explosive gas, damage to furnace cooling equipment, etc., to meet the needs of environmental protection and reduce knocking Risk, the effect of prolonging payback time

Active Publication Date: 2018-07-24
HANDAN IRON & STEEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of lowering the material surface, if the H2 content in the furnace top gas is not properly controlled, it is easy to form explosive gas and cause a gas explosion accident
Blast furnace detonation can easily cause damage to the furnace top equipment, and the refractory material of the furnace wall will fall off. In severe cases, the furnace top may be pushed open to disperse, damage the furnace body cooling equipment, and cause the interruption of the process of lowering the material surface

Method used

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  • Method for reducing shutdown knock of lowering charge level of blast furnace
  • Method for reducing shutdown knock of lowering charge level of blast furnace
  • Method for reducing shutdown knock of lowering charge level of blast furnace

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Example 1: Take Handan Iron and Steel 3200m 3 Taking the shutdown of the blast furnace on the falling material surface on February 27, 2017 as an example, the specific process of the method for reducing the knocking at the falling material surface of the blast furnace is as follows.

[0032] (1) Before the start of the lowering surface, check the three-stage static pressure nitrogen purge pipeline of the furnace body, open the nitrogen valve, and purge the nitrogen flow rate from the normal flow rate of 250m 3 / h increased to 500m 3 / h.

[0033] (2) After the lowering surface starts, increase the nitrogen flow rate of the top airtight box from 1500m 3 / h increased to 3000m 3 / h.

[0034] (3) After pumping water from the top of the furnace starts, the nitrogen flow rate of the valve box on the top of the furnace is changed from the normal flow rate of 600m 3 / h increased to 1200m 3 / h.

[0035] (4) From the lowering surface to the middle of the furnace body, open ...

Embodiment 2

[0040] Embodiment 2: Take Handan Iron and Steel 2000m 3 Taking the shutdown of the blast furnace on the falling material surface on November 6, 2017 as an example, the specific process of the method for reducing the knocking at the falling material surface of the blast furnace is as follows.

[0041] (1) Before the start of the lowering surface, check the three-stage static pressure nitrogen purge pipeline of the furnace body, open the nitrogen valve, and the flow rate of nitrogen purge is changed from the normal flow rate of 200m 3 / h increased to 400m 3 / h.

[0042] (2) After the lowering surface starts, increase the nitrogen flow rate of the airtight box on the top of the furnace, from 1300m 3 / h gradually increased to 3250m 3 / h.

[0043] (3) After pumping water from the top of the furnace starts, the nitrogen flow rate of the valve box on the top of the furnace is changed from the normal flow rate of 500m 3 / h increased to 900m 3 / h.

[0044] (4) From the lowering ...

Embodiment 3

[0049] Embodiment 3: Take Handan Iron and Steel 3200m 3 Taking the shutdown of the blast furnace at the lowering surface as an example, the specific process of the method for reducing knocking at the lowering surface of the blast furnace is as follows.

[0050] (1) Before the start of the lowering surface, check the three-stage static pressure nitrogen purge pipeline of the furnace body, open the nitrogen valve, and the flow rate of nitrogen purge is changed from the normal flow rate of 200m 3 / h increased to 400m 3 / h.

[0051] (2) After the lowering surface starts, increase the nitrogen flow rate of the airtight box on the top of the furnace, from 1400m 3 / h increased to 3080m 3 / h.

[0052] (3) After pumping water from the top of the furnace, the nitrogen flow rate of the valve box on the top of the furnace is changed from the normal flow rate of 800m 3 / h increased to 1200m 3 / h.

[0053] (4) From the lowering surface to the middle of the furnace body, open a materi...

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Abstract

The invention discloses a method for reducing shutdown knock of a lowering charge level of a blast furnace. The method adopts the technology that in the shutdown process of the lowering charge level of the blast furnace, nitrogen is led into the blast furnace by a furnace top water filling pipe, a furnace top airtight box overflow hole, a furnace top valve box, a furnace body static pressure holeand a furnace top material tank secondary equalizing device. The method has the advantages that a fixed amount of nitrogen is led into the blast furnace by the furnace top water filling pipe, the furnace top airtight box overflow hole, the furnace top valve box, the furnace body static pressure hole and the furnace top material tank secondary equalizing device; the water flow can be atomized intosmall water droplets by the led nitrogen, the surface area is increased, the explosive gas components of H2 (hydrogen) and the like in the mixed gas can be thinned, the knock risk is reduced, and theblast furnace can be safely and smoothly shut down.

Description

technical field [0001] The invention relates to a technology for shutting down a blast furnace at the lowering surface, in particular to a method for reducing knocking at the lowering surface of a blast furnace. Background technique [0002] Blast furnace shutdown is the shutdown operation before the major and medium maintenance of the blast furnace. It is an important part of the blast furnace process operation. It is generally required to lower the material level to the tuyere area below the furnace waist. In the process of lowering the material surface, if the H2 content in the furnace top gas is not properly controlled, it is easy to form explosive gas and cause a gas explosion accident. Blast furnace detonation can easily cause damage to the furnace top equipment, and the refractory material of the furnace wall will fall off. In severe cases, the furnace roof may be pushed open to disperse, damage the furnace body cooling equipment, and cause the interruption of the pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B5/00
CPCC21B5/00
Inventor 卢建光李志明高远霍红岩李会肖姜曦霍志军李迎利
Owner HANDAN IRON & STEEL GROUP
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