Blast furnace roof flange installing method

Abstract

The invention relates to a blast furnace roof flange installing method. Preheating is conducted to 190-210 DEG C before welding; rib plates are adopted for strengthening a flange for restraining deformation, and the rib plates are arranged along the periphery of a furnace roof at equal intervals; preliminary leveling is conducted on the flange, and after leveling, welding lines between the rib plates and a furnace body are leveled; accurate leveling is conducted on the flange, four-point leveling is conducted on the flange along the flange center according to cross symmetry, vertical welding lines between the corresponding rib plates in the four-point direction and the flange are subjected to spot welding, and after accurate flange leveling and spot welding of the vertical welding lines between all the rib plates and the flange are gradually finished according to the above manner, the vertical welding lines between all the rib plates and the flange are welded through a skip reverse welding method; and during flange welding, welding is synchronously conducted along the flange center according to the four-point positions of the cross center line, a segmented reverse welding method isadopted in welding, and synchronous reversing is conducted in the welding process. In the flange welding process, a balance level and an invar ruler are adopted for welding deformation monitoring. Bymeans of the blast furnace roof flange installing method, the flange installing quality can be improved, the construction period is shortened, and the construction cost can be better reduced.

Description

technical field [0001] The invention belongs to the technical field of flange installation, and in particular relates to a method for installing a blast furnace roof flange. Background technique [0002] Blast furnace top charging equipment, whether it adopts bell-valve type top charging equipment or bellless top charging equipment, if the equipment directly connected to the top flange or the gap between the equipment and the top flange When there is a problem with the seal and needs to be overhauled, it is quite troublesome to deal with. If the installation quality of the furnace top flange is not good or the seal is not handled properly, it will directly affect the service life of the furnace top charging equipment, thereby affecting the generation life of the blast furnace and affecting the production efficiency of the owner. [0003] The relevant national construction specifications and technical documents of manufacturers of modern blast furnace roof equipment usually ...

AI Technical Summary

Problems solved by technology

[0008] The above requirements are due to: if the above requirements are not met, the seal between the bell and the bell seat will be affected when the bell valve type furnace roof is used; when the bellless furnace roof is used, the rotating distributor will be driven The base of the gear box is deformed, which will lead to premature failure of the gear box; at the same time, it will also affect the seal between the furnace roof equipment and the furnace roof flange. Blast furnace gas leakage occurred in the roof area, causing serious safety hazards

[0009] The main feature of the traditional process is that only the jump-back welding method is used, and the intermediate process is not monitored. The requirements for the installation of material equipment need to be processed later

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