Method for blowing furnace washing agent by using air inlet of blast furnace

A technology of tuyere injection and furnace cleaning agent, which is applied in the field of iron and steel smelting, and can solve problems such as difficulty in active furnace hearth, graphite accumulation and limited effect, and reduction of slag viscosity.

Active Publication Date: 2011-02-02
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this method are as follows: In the initial stage of the formation of the reflow zone, the furnace washing agent enters the primary slag, and in order to achieve the purpose of washing the furnace and removing the slag, the distribution position is mostly at the edge of the blast furnace, which is affected by the inhomogeneity of the interaction of the furnace charge. As a result, there is inhomogeneity in the circumference of the blast furnace
The intermediate slag formed i

Method used

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  • Method for blowing furnace washing agent by using air inlet of blast furnace
  • Method for blowing furnace washing agent by using air inlet of blast furnace
  • Method for blowing furnace washing agent by using air inlet of blast furnace

Examples

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Effect test

Embodiment 1

[0023] Example 1: Blast furnace ironmaking process From the perspective of the static pressure distribution of the blast furnace, the resistance loss in the lower part of the blast furnace increased, the pressure difference across the furnace increased, the air permeability of the material column decreased, the air volume decreased by 7% compared with the normal level, and the temperature of the lower cooling wall surface was lower. The temperature of the cooling wall does not change much, and it can be judged that slag iron accumulation has formed in the furnace hearth. The injection of fluorite powder is used for treatment. The injection rate of fluorite powder is 5.0kg / tFe. The basicity of the binary slag determined by the ore, flux, coke and injection coal powder loaded on the furnace top is controlled at 1.02. The injection is until the air volume is restored. until normal. The process of spraying fluorite powder increases the wind temperature by 20 oC.

Embodiment 2

[0024] Example 2: During the blast furnace ironmaking process, from the perspective of the static pressure distribution of the blast furnace, the resistance loss of the lower part of the blast furnace increased, the pressure difference of the whole furnace increased, the air permeability of the material column decreased, the air volume decreased by 8% compared with the normal level, and the temperature of the lower cooling wall surface Little change, it can be judged that slag iron accumulation is formed in the hearth. The injection of fluorite powder is used for treatment, and the injection rate of fluorite powder is 6.0kg / tFe. The basicity of the binary slag determined by the ore, flux, coke and injection coal powder loaded on the furnace top is controlled at 1.06, and the injection is until the air volume is restored. until normal. The process of spraying fluorite powder increases the wind temperature by 24 oC.

Embodiment 3

[0025] Example 3: Blast furnace ironmaking process, from the static pressure distribution of the blast furnace, the resistance loss of the lower part of the blast furnace increased, the pressure difference of the whole furnace increased, the air permeability of the material column decreased, the air volume decreased by 9% compared with the normal level, and the temperature of the lower cooling wall surface Little change, it can be judged that slag iron accumulation has formed in the hearth. The injection of fluorite powder is used for treatment. The injection rate of fluorite powder is 10kg / tFe. The basicity of the binary slag determined by the ore, flux, coke and injection coal powder loaded on the furnace top is controlled at 1.12. so far. The process of spraying fluorite powder increases the comprehensive coke ratio by 8 Kg / tFe while increasing the oxygen content of the blast by 10‰.

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PUM

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Abstract

The invention discloses a method for blowing a furnace washing agent by using the air inlet of a blast furnace, and aims to rapidly solve the problems of adhesion on the lower part of the blast furnace and hearth accumulation. The method comprises the following steps of: feeding high-pressure fluidized furnace washing agent powder into a coal dust blowing pipeline according to the proportion; and blowing the furnace washing agent powder and the coal dust into the hearth of the blast furnace together from the air inlet by a blast furnace coal blowing device, wherein 2.0 to 15kg of the furnace washing agent is added into one ton of Fe; and the furnace washing agent powder is fluorite powder, manganese mineral powder or mixture of the two. In the method of the invention, the furnace washing agent and the coal dust are blown into the furnace together from the air inlet of the blast furnace, so that the furnace washing agent directly acts on a high-viscosity slag accumulation part; and by improving the fluidity of the slag and reacting the slag with graphite carbon, the adhesion of the slag to the furnace wall on the lower part and the hearth accumulation are reduced and eliminated, the hearth center is activated, and proper operation furnace profile is maintained.

Description

technical field [0001] The invention relates to an iron-making technology, in particular to a method for spraying a cleaning agent into a blast furnace by using a tuyere device of a blast furnace to eliminate bonding at the lower part of the blast furnace and accumulation in a furnace hearth, and belongs to the technical field of iron and steel smelting. Background technique [0002] In the blast furnace ironmaking process, due to the high viscosity of the slag, the cooling intensity does not match it, causing the slag in the lower part of the blast furnace to stick to the furnace wall (such as figure 1 shown), or slag iron accumulation caused by insufficient hearth temperature, slag accumulation caused by excessive slag alkalinity, graphite accumulation caused by high silicon and high alkalinity operation (such as figure 2 , image 3 shown). Due to the furnace wall bonding and hearth accumulation affect the reasonable operation of the furnace type, which in turn affe...

Claims

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Application Information

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IPC IPC(8): C21B5/00
Inventor 白瑞国杜维玲马特
Owner HEBEI IRON AND STEEL
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