A rapid repair process for blast furnace hot blast stove pipes

Abstract

The invention relates to a rapid repairing technology of a blast furnace hot blast stove pipeline. The technology comprises the steps that firstly, imperfect ports are cleaned; secondly, modes are arranged; thirdly, a fish skeleton frame is manufactured; fourthly, high-abrasion-resisting ceramic pouring is conducted; fifthly, a zirconium-contained ceramic fiber blanket is laid fully, and a steel shell is recovered; and finally, mudjacking is conducted. The hot blast stove pipeline can be put into operation after the steps are conducted. To achieve the solidifying effect, it is better to follow the progressive principle when the temperature and pressure of supplied air of a hot blast stove are improved. After the repaired hot blast stove pipeline is put into operation, a daily monitoring checking rule should be established for the part. The rapid repairing technology has the beneficial effects that maintaining is easy and convenient, cost is low, the requirement for rapid repairing can be met, a blast furnace can resume production as soon as possible, and after the hot blast stove pipeline breaks down, production is recovered rapidly, and the production cost is reduced; and refractory needed for repairing has good high-temperature and high-pressure resisting performance and can meet the requirement for normal air supplying of the hot blast stove.

Description

technical field [0001] The invention belongs to the technical field of pipeline equipment repair, and relates to a quick repair process for blast furnace hot blast stove pipelines. Background technique [0002] Blast furnace hot blast stove pipeline is the delivery pipeline of high blast furnace blast temperature, which has been in high temperature (>1000°C) and high pressure (>0.15Mpa) operating environment for a long time. Affected by factors such as thermal stress and aging of refractory materials, the piping system of the hot blast stove may suddenly be damaged, and the damage has two phenomena: burn-through and collapse. The withdrawal of the hot blast furnace has had a major impact on blast furnace production. At present, the material of the hot air pipeline is relatively complicated, usually including a layer of high-alumina bricks, a second layer of insulation bricks, a layer of fiber blanket and a layer of heat-resistant spray paint. In some key parts such as...

AI Technical Summary

Problems solved by technology

Affected by factors such as thermal stress and aging of refractory materials, the piping system of the hot blast stove may suddenly be damaged, and the damage has two phenomena: burn-through and collapse. The withdrawal of the hot blast stove has a major impact on the production of the blast furnace

At present, the material of the hot air pipeline is relatively complicated, usually including a layer of high-alumina bricks, a second layer of insulation bricks, a layer of fiber blanket and a layer of heat-resistant spray paint. In some key parts such as the trident of the main pipe and the branch pipe, the trident of the main pipe and the surrounding pipe The brick linings are composite bricks. After burning through or collapsing, the conventional repair method is to use different types of refractory bricks to recover according to the original pipeline design drawings, such as ready-made supporting refractory bricks, blast furnace shutdown or hot blast furnace It can be repaired after being out of service for 3-5 days. If there are no refractory bricks on site, you need to find a manufacturer to make or buy them again. The blast furnace needs to be shut down or the hot blast stove is out of service for 10-30 days for repair. For continuous production of blast furnaces, Great impact in terms of production recovery and cost

Therefore, the conventional repair method will not only increase the difficulty and production cost of subsequent furnace condition restoration, but also be inconvenient to operate and take a long time

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