Method for achieving furnace protection through tuyere titanium injection with utilization of blast furnace coal injection system

Abstract

The invention provides a method for achieving furnace protection through tuyere titanium injection with utilization of a blast furnace coal injection system. Prepared titanium fine powder with the main components being TiO2 and iron fine powder and the particle size being smaller than or equal to -200 meshes is hoisted and conveyed to a coal distribution bin. The titanium fine powder is added onto a coal feeding belt in batches through a coal feeder at the bin bottom of the coal distribution bin and enters a coal grinding system together with raw coal powder through a coal mill raw coal bin. The titanium fine powder and the raw coal powder enter a coal powder bin after mixed evenly in the coal grinding system. The evenly mixed titanium fine powder and raw coal powder entering the coal powder bin are together injected into a blast furnace through a tuyere by a blast furnace injection system. According to the method, additional equipment is not needed, the titanium fine powder and the coal powder can be mixed evenly through an existing power making coal injection system of the blast furnace, the titanium fine powder is injected into the blast furnace along with the coal powder through the tuyere of the blast furnace by a coal injection gun pertinently and safely in time according to the titanium load requirement needed by furnace protection of the blast furnace, and the furnace protection purpose is achieved.

Description

technical field [0001] The invention relates to a method for quickly repairing the hearth and furnace bottom of the blast furnace by using the existing injection system of the ironmaking blast furnace, especially a method for quickly protecting the furnace by spraying titanium from the tuyere by using the coal injection system of the blast furnace. Background technique [0002] Blast furnace hearth and furnace bottom erosion are major hidden dangers that threaten the safety of blast furnace production, and are also the main factors that determine the life of a generation of blast furnaces. Abnormal erosion of hearth is common in domestic and foreign blast furnaces, and effective control of abnormal erosion of blast furnace hearth has become an important technical goal of the world's ironmaking industry. [0003] At present, there are two main methods for conventional blast furnace spraying titanium to protect the furnace, one is to add titanium ore or titanium pellets from t...

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Problems solved by technology

[0005] This method partly solves the defects of adding titanium ore on the furnace top and tuyeres to feed the wire to protect the furnace, but there are also the following problems: on the one hand, the particle size of vanadium-titanium ore powder is relatively large, and the hardness of titanium dioxide is relatively large, so it is difficult to process coal when grinding coal. It is difficult to achieve the same particle size as pulverized coal in normal coal grinding, and it will cause damage to the coal mill; on the other hand, due to the density of vanadium-titanium ore powder (about 2.5t / m 3 ) and the density of pulverized coal (about 0.5t / m 3 ) is quite different, if the particle size of the vanadium-titanium ore powder is large, it is very easy to cause the coal pulverizer to spit out dust during the process of mixing with coal powder in the coal mill, and in the subsequent conveying process after the vanadium-titanium ore powder is mixed with coal powder It will also cause the composition segregation of the mixture and cannot guarantee the stability of the composition of the mixed powder.

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