A process for cleaning the inner cover of bell annealing furnace

Abstract

The invention relates to a process for cleaning the inner cover of a bell-type annealing furnace, and belongs to the technical field of cold-rolled thin plate and coil bell-type annealing furnace equipment in the metallurgical industry. The technical solution is to load convection plates and steel coils with a stack height of more than half or the entire furnace on the annealing furnace table, quickly heat up in the nitrogen small flow mode, and then keep it warm for a period of time. During the heat preservation period, compressed air is introduced. After the heat preservation is completed, , turn off the compressed air, cool and discharge normally in nitrogen mode; then use high-pressure water to flush the residue on the inner wall of the inner cover; finally, perform secondary annealing in hydrogen mode to restore the inner cover, furnace table, convection plate or The oxidized part of the scrap coil. The invention has the beneficial effects of regularly cleaning the inner cover of the annealing furnace, improving the annealing efficiency, and preventing defects such as roll scratches and bright lines during the production of the subsequent process pass mill.

Description

technical field [0001] The invention relates to a process for cleaning the inner cover of a bell-type annealing furnace, which belongs to the technical field of cold-rolled sheet coil bell-type annealing furnace equipment in the metallurgical industry. Background technique [0002] At present, in the cold-rolled sheet production process, after long-term use of the bell-type annealing inner cover, a layer of dust and carbon powder will adhere to the inner wall surface of the inner cover, resulting in reduced heat transfer effect of the inner cover wall, increased energy consumption, and reduced annealing efficiency. , It also makes the inner cover wall brittle due to carburization. When the dust and carbon powder accumulate to a certain extent, the foreign matter attached to the inner wall will fall off and fall to the end face of the cold-rolled sheet coil during the process of hoisting out the inner cover and buckling the cover. Roll scratches and bright line defects affec...

AI Technical Summary

Problems solved by technology

[0002] At present, in the production process of cold-rolled thin plates, after long-term use of the bell-type annealing inner cover, a layer of dust and carbon powder will adhere to the inner wall surface of the inner cover, resulting in reduced heat transfer effect of the inner cover wall, increased energy consumption, and reduced annealing efficiency. , also makes the inner cover wall become brittle due to carburization

When the accumulated dust and carbon powder accumulate to a certain extent, the foreign matter attached to the inner wall will fall off and fall to the end face of the cold-rolled sheet coil during the process of hoisting out the inner cover and buckling the cover. Roll scratches and bright line defects affect product quality

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