Closed furnace door of electric arc furnace

Abstract

The invention provides a closed furnace door of an electric arc furnace, and relates to the field of electric arc furnace steelmaking. The closed furnace door of the electric arc furnace comprises a furnace door body mounted outside a furnace opening of the electric arc furnace, and further comprises a first heat-resisting part and a second heat-resisting part; the top ends and the two side edgesof the furnace door body are in sealing fit with a furnace shell of the electric arc furnace; the first heat-resisting part and the second heat-resisting part can resist the furnace slag temperature in the electric arc furnace; the first heat-resisting part is fixedly arranged on the inner side wall of the furnace door body and downwards protrudes out of the furnace door body; the second heat-resisting part is located at the lower edge of the furnace opening and fixedly connected with the outer wall of the furnace shell; and a slag sliding gap can be formed between the first heat-resisting part and the second heat-resisting part. According to the closed furnace door of the electric arc furnace, the technological requirement of simultaneous smelting and slag sliding of the electric arc furnace can be met, and air outside the furnace can be prevented from entering the furnace.

Description

technical field [0001] The invention relates to the field of electric arc furnace steelmaking, in particular to a closed furnace door of an electric arc furnace. Background technique [0002] At present, the upper part of the electric arc furnace door is composed of water-cooled coils. This type of furnace door can withstand high-temperature radiation from molten steel and slag, but it cannot be in direct contact with high-temperature slag, otherwise there will be a risk of being burned through and exploding. Therefore, in the existing electric furnace steelmaking process, in order to meet the technological requirements of smelting and slag sliding, the furnace door must be opened and a certain gap must be kept with the high-temperature slag. [0003] However, the gap between the furnace door and the high-temperature slag will allow the air outside the furnace to enter the furnace. The air outside the furnace enters the furnace, bringing in a large amount of nitrogen and ot...

AI Technical Summary

Problems solved by technology

Oxygen entering the furnace will increase the oxidation and consumption of electrodes, and other gases except oxygen entering the electric furnace will increase the operating load of the dust removal system. After nitrogen enters the furnace, cracking will occur under high-temperature electric arc, which will cause nitrogen increase in molten steel. , reduce the purity of molten steel

[0004] However, if the furnace door and the furnace shell are completely sealed, the furnace door will lose the function of slag sliding, and it cannot meet the needs of electric arc furnace smelting.

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