A kind of nitrogen protection iron ditch and its nitrogen protection method

Abstract

The invention provides a nitrogen protection iron runner and a nitrogen protection method thereof. The iron runner comprises an iron runner main body and a pipeline gas injection device, wherein the pipeline gas injection device comprises gas delivery pipelines, gas delivery pipeline fixing mechanisms and gas guide mechanisms; the iron runner main body is connected with a blast furnace shell; the gas delivery pipelines are respectively arranged on two sides of the runner wall of the iron runner main body along the runner length direction; a gas inlet pipe is arranged at a position, which is close to the iron notch end, of the gas delivery pipeline; an air curtain forming part is formed in the gas delivery pipeline; the gas delivery pipelines are respectively connected with the iron runner main body and the blast furnace shell through the gas delivery pipeline fixing mechanisms; and the gas guide mechanism is arranged on each gas delivery pipeline. The nitrogen isolation and protection technology is introduced, and refractory matters in the iron runner are protected by totally adopting a pipeline blowing mode or totally adopting a mode of introducing nitrogen into the runner cover or adopting a mode of combining pipe blowing with gas introduction in the runner cover.

Description

technical field [0001] The invention relates to the longevity technology of iron trench refractory materials, in particular to a nitrogen protection iron trench and a nitrogen protection method thereof. Background technique [0002] Tiegou refractories (generally Al 2 o 3 -SiC-C quality) The erosion damage mechanism during use is firstly that the C on the surface of the material is replaced by the O in the air 2 Oxidation leads to a significant decrease in the slag penetration resistance of the material. Because slag and carbon are not wet, carbon is a good anti-slag penetration material, but carbon is easy to oxidize at high temperature, once oxidized, slag can easily penetrate into refractory castables. Therefore, the erosion of iron trough refractories is not only the reaction of slag in the iron trough with the refractory material on the surface, but also the slag will penetrate into the refractory material and react with the refractory material components within a ce...

AI Technical Summary

Problems solved by technology

However, from the perspective of the practical application of the iron trench, even if the quality of the refractory castable has reached a relatively high or even very high level, with the continuous increase of the blast furnace iron output, the erosion degree of the iron trench will still increase significantly. The ditch continues to work, and the refractory materials must be continuously sprayed in the later stage

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