Method for inhibiting zinc steam diffusion in galvanized wire furnace nose

Abstract

The invention provides a method for inhibiting zinc steam diffusion in a galvanized wire furnace nose. An air blowing opening and an air suction opening are formed in the two sides of the furnace nosecorrespondingly, the air blowing opening is used for sucking in dry nitrogen, the air suction opening sucks the gas continuously, and the rear portion of the air suction opening is connected with a steam collecting and treating device. The dry nitrogen brings away zinc steam generated by evaporation on the surface of zinc liquid in the furnace nose, the airflow is parallel to the surface of beltsteel and moves towards the air suction opening so that the zinc steam above the zinc liquid can be brought away continuously, and the zinc steam cannot be accumulated on the inner wall of the furnacenose to form zinc dust. Compared with the prior art, the method has the beneficial effects that due to the fact that the zinc steam in an area above the zinc liquid face is sucked away, zinc dust cannot be precipitated, and wet nitrogen does not need to be adopted for controlling zinc steam any more; the reducing atmosphere in the area above the zinc liquid in the furnace nose is high so that oxidation of sensitive elements cannot be avoided; and meanwhile, the airflow is parallel to the surface of the belt steel, and extra influences cannot be generated on the belt steel galvanizing quality.

Description

technical field [0001] The invention relates to the technical field of manufacturing hot-dip galvanized steel sheets, in particular to a method for suppressing the diffusion of zinc vapor in the nose of a galvanizing line furnace. Background technique [0002] During the production of hot-dip galvanized sheets, the steel strip must enter the hot-dip galvanizing pot for galvanizing through the connecting channel between the annealing furnace and the hot-dip galvanizing pot (commonly known as "furnace nose"). The zinc liquid surface continuously evaporates to produce zinc vapor, which gradually condenses during the internal movement of the furnace nose, gathers on the side wall of the furnace nose to form zinc ash, and falls to the surface of the steel strip and the zinc liquid surface due to vibration and other reasons , These will affect the quality of galvanizing, resulting in zinc dust defects. [0003] In order to avoid zinc ash defects, the prior art generally adopts tw...

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Problems solved by technology

[0002] During the production of hot-dip galvanized sheets, the steel strip must enter the hot-dip galvanizing pot for galvanizing through the connecting channel between the annealing furnace and the hot-dip galvanizing pot (commonly known as "furnace nose"), and the bottom of the furnace nose is immersed in zinc liquid. The zinc liquid surface continuously evaporates to produce zinc vapor, which gradually condenses during the internal movement of the furnace nose, gathers on the side wall of the furnace nose to form zinc ash, and falls to the surface of the steel strip and the zinc liquid surface due to vibration and other reasons , these will affect the quality of galvanizing, resulting in zinc dust defects

[0003] In order to avoid zinc ash defects, the prior art generally adopts two treatment methods: 1) Regularly use a pipeline to feed compressed gas into the furnace nose area to blow out the zinc ash and other sundries in the furnace nose, and blow out the zinc ash and other debris on the surface of the zinc liquid surface. All the slag is removed, so that the defect of zinc ash will be solved to a certain extent, but each cleaning will not only affect the production, but also recur in a short time; Protective gas, after controlling the dew point, a layer of Al is produced on the surface of the zinc liquid in the furnace nose by using the effect of a small amount of moisture in the protective gas 2 o 3 and ZnO oxide film to prevent the escape of zinc vapor. This method controls the generation of zinc dust, but the oxidized impurities generated on the surface of the zinc liquid become zinc dross, which still affects the quality of strip galvanizing.

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