A method of maintaining the hearth

Abstract

The invention provides a hearth maintenance method and a device. The method comprises the following steps: the temperature of cooling water in the high-temperature point position of a hearth is controlled within 20-30 DEG C; the mass percentage of sintered ores in blast furnace raw materials of the hearth is controlled within 64-66%, the mass percentage of pellet ores is controlled within 25-30%, and the mass percentage of raw ores is controlled within 4-10%; the carbon brick remained thickness in the high-temperature point place of the hearth is not lower than 700 mm; the temperature change in the high-temperature point position is monitored in real time; when the temperature exceeds 300 DEG C, the local forced cooling is performed for the high-temperature point to guarantee the carbon brick thickness of the hearth to be above the safety thickness; when titanium balls are used for protecting a furnace, as the mass percentage of low titanium balls TiO2 in the pellet ores is 1.1-1.3%, the furnace charging grade is guaranteed, and the influence on furnace conditions is reduced to the greatest extent; and finally, when the hearth generates the high-temperature point, the normal and stable production of a blast furnace is guaranteed when solving potential safety hazards, so that the economic benefit is improved, and the service life of the blast furnace is prolonged.

Description

technical field [0001] The invention belongs to the technical field of ironmaking engineering, and in particular relates to a method for maintaining a furnace hearth. Background technique [0002] The blast furnace is an indispensable equipment in the field of ironmaking. Prolonging the service life of the blast furnace is a major measure for the sustainable development of iron and steel enterprises, not only in the ironmaking process itself, but also in the entire iron and steel complex. Reduce production costs, reduce energy consumption, reduce pollutant emissions, etc., so that the efficient production, continuous and compact production of iron and steel complexes can continue. [0003] Especially after the blast furnace has been opened for several years, for blast furnaces with local high-temperature spots (temperatures above 300°C) in the hearth, it is necessary to ensure the longevity of the blast furnace and solve potential safety hazards; it is also necessary to ensu...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems existing in the prior art, the embodiment of the present invention provides a method for maintaining the furnace hearth, so as to solve the problem in the prior art that when high temperature spots appear locally in the furnace hearth, it is impossible to ensure the normal and stable production of the blast furnace while solving potential safety hazards , leading to the shutdown of the hearth and the technical problems that reduce economic benefits

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