Blast furnace overhaul method

Abstract

A method for revamping a blast furnace that has a furnace body and a furnace body tower installed on a site foundation includes: while an old blast furnace is in operation (S1), a new furnace construction step (S2) of constructing a new furnace tower structure and a new furnace proper on the new foundation at a site different from the site foundation; and a foundation segmentation step (S3) of vertically cutting the site foundation to segment the site foundation into a foundation top on which the old furnace proper and the old furnace tower structure are mounted and a foundation bottom; blowing out the blast furnace (S4); an old furnace pull-out step (S5) of carrying out the foundation top integrally with the old furnace proper and the old furnace tower structure; and a new furnace pull-in step (S6) of introducing the new foundation on the foundation bottom integrally with the new furnace tower structure and the new furnace proper.

Description

technical field [0001] The invention relates to a method for overhauling a blast furnace, in particular to a method for overhauling a blast furnace capable of removing an old furnace body and a tower frame of an old furnace body in a short time and constructing a new furnace body and a tower frame of a new furnace body. Background technique [0002] For blast furnaces used for ironmaking, major repairs, that is, renewal of the furnace body, are required every ten years. [0003] Renewal of the furnace body is carried out by removing the old furnace body built on the foundation of the blast furnace installation site and constructing a new furnace body on the same foundation. [0004] When updating the furnace body, the old furnace body is disassembled on the basis of the blast furnace setting site, and then a new furnace body is constructed. This will cause the following problems: the blowout time of the blast furnace is longer, Huge economic losses will be generated every d...

AI Technical Summary

Problems solved by technology

[0004] When updating the furnace body, the old furnace body is disassembled on the basis of the blast furnace setting site, and then a new furnace body is constructed. This will cause the following problems: the blowout time of the blast furnace is longer, Huge economic losses will be incurred every day of furnace shutdown

However, in Patent Document 3, the tower of the furnace body is not renewed, and it cannot be applied to the renewal of the blast furnace accompanying the expansion of the furnace body volume.

[0025] In addition, in the above-mentioned Patent Document 4, the device envisaged is a small building that can be transported by ships and vehicles. Therefore, the technology of Patent Document 4 cannot be directly applied to the renewal of blast furnaces, and needs to be expanded and contracted by the framework. As well as the disassembly and assembly of the lower device, etc., this will not bring about the effect of shortening the overhaul period

[0026] In this way, in the large-scale modular construction method shown in the above-mentioned patent document 1 or patent document 2, it is difficult to further shorten the construction period, and even if referring to patent document 3 and patent document 4 which describe the prior art, it is difficult to establish During the overhaul of the blast furnace, the old furnace body and the tower of the old furnace body are removed in a short period of time, and the new furnace body and the tower of the new furnace body are constructed

Images