A method of shutting down the blast furnace empty material line without putting residual iron and burning dead coke piles in the tuyere area

Abstract

The invention discloses a method for shutting down the empty material line of a blast furnace without putting residual iron to burn off the dead coke in the tuyere area, which specifically includes the following steps: (1) Installing a blast furnace roof atomization water pumping system before shutting down the furnace and using it normally ‑(2) One day before the shutdown, adjust the composition of slag and iron and the temperature of molten iron Material line operation; this method lowers the final material level to a deeper level during the process of emptying the material line of the blast furnace, burns all the dead coke piles in the furnace hearth in the tuyere area, and finally lowers the entire material level to 1.5 meters or more below the center line of the tuyere. Reduce or cancel the artificial griddle after the shutdown, shorten the time for maintenance, overhaul, and cool the furnace, and reduce or avoid the consumption of manpower, material resources, and financial resources caused by the griddle.

Description

technical field [0001] The present invention relates to an operation method in the field of metallurgy, which is an operation method for shutting down the empty material line of a blast furnace, which can be applied to the operation method for shutting down the blast furnace from the empty material line to the centerline of the tuyere of the blast furnace for some reason. Specifically, it is a method for shutting down the empty material line of the blast furnace without releasing the residual iron to burn off the dead coke pile in the tuyere area. Background technique [0002] The production of iron-making blast furnaces reaches a certain number of years, and they need to be repaired or overhauled. There are two methods of shutting down the blast furnace: the filling method and the empty material line method. The empty material line method means that the furnace is not charged during the shutdown process. Feed water to control the temperature of the furnace top. When the mat...

AI Technical Summary

Problems solved by technology

[0006] (1) Blast furnace shutdown is the shutdown operation before the overhaul, medium repair, and minor repair of the blast furnace. It is an integral part of the blast furnace operation. The material level is lowered to the tuyere area to minimize the difficulty of cleaning the blast furnace after the shutdown, and reduce the maintenance period and cost of the blast furnace; because it is worried that if the final material level is too low, a large number of tuyeres will be blown out, and explosive gas will easily be formed. It affects the safety of the furnace shutdown. Therefore, in the actual operation of the blast furnace empty material line, the inspection of the material level after the shutdown of the furnace often shows that the position of the final material level is too high (far higher than the center line of the tuyere), and the cleaning of the blast furnace after the shutdown is increased. difficulty, increasing the duration and cost of blast furnace overhaul;

Images