Online grouting process for cold and hot surfaces of blast furnace

Abstract

The invention discloses an online grouting process for cold and hot surfaces of a blast furnace. The online grouting process comprises the following steps of: before damping down of the blast furnace, determining the hole opening positions, number, used materials and construction sequence of grouting holes according to the conditions of gas leakage, hearth erosion and the like at different positions; during damping down of the blast furnace, completing the hole opening, dredging and welding work of the grouting holes; after the blast furnace air supply returns to normal, performing online grouting operation, wherein when gas leakage occurs in a tuyere large sleeve, a flange and the upper area of a bosh, a high-aluminum composite heat-insulating pressed material is used; when gas leakage occurs in a tuyere middle sleeve, a large sleeve and an iron notch area and the hearth is eroded, a high-heat-conductivity carbon composite pressed material is used; and when furnace-based gas leakage occurs, a special sealing material for furnace bottom gas leakage is used. The operation mode of the online grouting process disclosed by the invention is beneficial to the flowing and permeation of slurry, and meanwhile, the construction mode is beneficial to the internal support of carbon bricks and steel structures, so that effective filling of fine gaps or honeycomb gaps is realized, and the situation that the construction quality is influenced due to too short maintenance time during damping down is avoided.

Description

technical field [0001] The application belongs to the technical field of blast furnace grouting, and in particular relates to an online grouting process for hot and cold surfaces of a blast furnace. Background technique [0002] After the newly built or overhauled blast furnace is put into production, due to subjective and objective factors such as design reasons, refractory quality, construction quality, raw materials and fuels used in the later production process, water leakage and other subjective and objective factors, each blast furnace has different degrees of gas leakage at different locations. Gas leakage It not only destroys blast furnace refractories, but also threatens the safety of workers. The leakage of blast furnace gas also proves that there are channels for blow-by gas on the hot and cold surfaces of the furnace. The dust carried by the high-temperature gas not only washes away the steel structure and forms gullies on the outside of the carbon bricks, but al...

AI Technical Summary

Problems solved by technology

During this period, the blow-by gas channel is in a closed state, which is easily blocked by dust, which is not conducive to the flow of slurry, and the channel of blow-by gas is originally a small gap or a honeycomb gap, which requires an appropriate high pressure to squeeze the slurry into the gap, while the blast furnace is closed. During the wind, there is no high-pressure construction condition

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