Liquid state slag removal method of high-temperature oriented silicon steel heating furnace

Abstract

The invention discloses a liquid state slag removal method of a high-temperature oriented silicon steel heating furnace. The liquid stage slag removal method comprises the following steps of uniformly paving a coke particle layer on the surfaces of the furnace bottoms of a second heating section and a soaking section of the heating furnace after slag removal when the stepped heating furnace is stopped; opening a burner nozzle of a slag removal hole, and uniformly adding deslagging agent particles on the furnace bottoms of the second heating section and the soaking section of the heating furnace till slag accumulated on the furnace bottom rises to cause that the burning flame shape of burner nozzles at the lower parts of the second heating section and the soaking section of the heating furnace and the temperature uniformity of the upper part and the lower part of the furnace cannot meet the normal heating quality requirement of high-temperature oriented silicon steel; and stopping heating the high-temperature oriented silicon steel of the heating furnace. According to the liquid state slag removal method, the heating furnace does not need to be transformed, and the liquid state slag can be efficiently and rapidly removed by using an existing liquid stage slag removal device; the liquid state slag removal method disclosed by the invention has the advantages of simple method, convenience for operation, excellent liquid state slag removal effect and the like; the comprehensive purposes of reducing the slag melting point, the molten slag viscosity and the maintenance cost of the high-temperature oriented silicon steel heating furnace, improving the molten slag fluidity, liquid state slag removal quantity, cycle heating quantity of the heating furnace and production efficiency of high-temperature oriented silicon steel heating furnace and the like are finally achieved.

Description

technical field [0001] The invention relates to the field of metallurgical industrial furnaces, in particular to a liquid-state slag removal method for a high-temperature oriented silicon steel heating furnace. Background technique [0002] The walking heating furnace for hot rolling of conventional steel grades in iron and steel enterprises generally consists of a preheating section, a first heating section, a second heating section and a soaking section. The furnace temperature in the first heating section is relatively low, generally ≤1330°C, the oxidation of the billet in the preheating section and the first heating section is relatively weak, and the oxidation product is solid oxide scale, while the furnace temperature in the second heating section and soaking section is as high as 1380~1400℃ is the most severely oxidized area in the billet furnace, and the high temperature of the furnace will cause liquid oxides to flow and drip to the bottom of the furnace, resulting ...

AI Technical Summary

Problems solved by technology

However, in the actual production process, due to the further oxidation of the liquid slag deposited on the bottom of the furnace through the further oxidation of the furnace atmosphere and its erosion reaction to the refractory material of the heating furnace, a slag with a high melting point and complex composition is gradually formed, resulting in the continuous increase in the viscosity of the slag and the liquid state. The slag output is far below the design level of 40%, and the actual cycle heating of high-temperature oriented silicon steel is also lower than the design level

[0005] In addition, due to the heat dissipation from the outer surface of the furnace bottom and the natural convection of the high-temperature combustion gas in the furnace, the temperature in the furnace is unevenly distributed along the height of the furnace, resulting in a low temperature at the bottom of the furnace, and the liquid slag falling from the bottom of the furnace cools down and thickens, and further Condensation, Solidification and Aggregation