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

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...

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 in the lower part of the reflow zone finally collects in the furnace hearth through the coke gap, and the effect of reducing the viscosity of the slag is more obviously reflected in the reflow zone itself and the position of the drop zone, but for the existing lower bonding, furnace The viscous slag in the center of the cylinder, as well as the graphite accumulation and action effect are limited, and the action time lags behind nearly one smelting cycle, so it is difficult to activate the hearth

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