Method for burning off stubborn coke piles at tuyere area without discharging remainder iron during blast furnace descending lowering stockline shutdown

Abstract

The invention discloses a method for burning off stubborn coke piles at a tuyere area without discharging remainder iron during blast furnace lowering stockline shutdown. The method specifically comprises the following steps of (1) installing a blast furnace top atomization water charging system before furnace shutdown and implementing normal use; (2) adjusting slag iron ingredients and the molteniron temperature the day before furnace shutdown; (3) charging a furnace shutdown material comprising a two-section structure and covering coke; (4) conducting damping-down in advance; and (5) conducting air supply and water charging lowering stockline operation. According to the method, during the blast furnace water charging lowering stockline operation process, the final material level is lowered deeper, the stubborn coke piles in a hearth at the tuyere area are totally burnt off, the total material level is lowered to 1.5 m below the center line of a tuyere or deeper finally, manual griddles after furnace shutdown are reduced or omitted, the overhaul, heavy repair and furnace cooling time is shortened, and consumption of manpower, material resources and financial resources caused by the griddles is reduced or avoided.

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...

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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;

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