Method for patching damaged blast furnace hot air pipeline inner liner in hot state

Abstract

The invention discloses a method for patching a damaged blast furnace hot air pipeline inner liner in a hot state, which comprises the following steps that: A, a curved welding plate with the same thickness and the same diameter as a pipeline steel case is adopted according to the damage conditions of the inner liner; B, a plurality of fixed hooks are manufactured and are welded on the lower end surface of the curved welding plate, and a hanging lug and a pulp pressing hole are arranged on the upper end surface; C, holes are formed in the pipeline steel case, and regular shapes are formed; D, relevant dimensions are measured according to the inner liner shapes to be patched after being cleaned; E, mold erecting die casting is carried out by casting materials according to the measured shape, the casting materials are hung to a pipeline opening position by the hanging lug for installation, and the welding plate and the pipeline steel case are welded; and F, press slurry is pressed into gaps among heat insulation casting materials 5, a heat insulation layer, a light brick layer and a heavy brick layer through slurry pressing holes, and the construction pressure is maintained at 2kg / cm<2>. The hot air pipeline inner liner patching is carried out in the hot state, and only 15hours is needed, so the blast furnace hot air pipeline inner liner is quickly patched, the patching can be completed by the fixed maintenance time of a blast furnace, and the normal continuous production of the blast furnace is ensured.

Description

technical field [0001] The invention belongs to the technical field of repair methods for blast furnace hot blast pipes, and in particular relates to a method for thermally repairing damaged blast furnace hot blast pipe inner linings. Background technique [0002] The hot blast pipeline connects the blast furnace and the hot blast stove, and the function of the hot blast stove is to store and provide hot blast for blast furnace smelting. The function of the hot blast pipeline is to transport and distribute the hot blast from the hot blast stove to each tuyere device of the blast furnace for ironmaking. Blast furnace hot air pipeline includes: hot air branch pipe, hot air main pipe, air mixing chamber or vertical pipe, hot air surrounding pipe, air supply branch pipe and other parts. The hot blast (1000℃~1280℃) coming out of the hot blast stove first flows into the hot blast main pipe through the hot blast branch pipe connected to each hot blast stove, and then enters the ho...

AI Technical Summary

Problems solved by technology

Part of the hot blast pipe is often damaged and falls off. If it is not repaired in time, the steel shell of the hot blast pipe will be burned and melted quickly, affecting the production of the blast furnace

[0004] If the conventional method of repairing the lining of the hot blast pipeline is adopted, the temperature of the hot blast pipeline will be lowered first, and then the internal mold of the pipeline will be repaired after the temperature of the pipeline is lowered. This will take 7 days, which will seriously affect the production of the blast furnace and cause huge losses.

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