Method for controlling content of hydrogen in zinc dissolving tank for electro-galvanizing and zinc dissolving system

Abstract

The invention relates to a method for controlling content of hydrogen in a zinc dissolving tank for electro-galvanizing, which comprises the following steps: arranging a hydrogen concentration detection instrument on a fog discharge pipeline connected to the zinc dissolving tank so as to monitor the hydrogen concentration in the zinc dissolving tank in real time; arranging a supporting plate with an inclined part in the zinc dissolving tank so as to be used for bearing zinc particles, and at least forming a plurality of through holes in the inclined part; when the hydrogen concentration reaches a first threshold, reducing the rotating speed of a zinc dissolving pump to the minimum, and starting a standby fan of a fog discharge system; and when the hydrogen concentration reaches a second threshold, enabling the zinc dissolving pump to stop working, and discharging the electroplating solution in the zinc dissolving tank to enable the liquid level in the zinc dissolving tank to be at least reduced to the position below the supporting plate, wherein the second threshold is greater than the first threshold. In addition, the invention also provides a zinc dissolving system which can implement the method. By adopting the control method and zinc dissolving system provided by the invention, the hydrogen concentration in the zinc dissolving tank is controllable, and the production safety and stability are effectively increased.

Description

technical field [0001] The invention belongs to the technical field of cold-rolled steel electrogalvanizing, and in particular relates to a method for controlling the hydrogen content in an electrogalvanizing zinc-dissolving tank and a zinc-dissolving system. Background technique [0002] Electro-galvanizing is one of the anti-corrosion technologies for steel. Electro-galvanized sheets are widely used in industries such as automobiles, home appliances, and light industry because of their good corrosion resistance, processability, weldability, and paintability. The continuous electrogalvanizing line for cold-rolled strip steel was developed in the 1940s. So far, more than 50 continuous electrogalvanizing lines have been put into production in the world. The line speed has reached 210m / min, and the maximum bandwidth has reached 2080mm. [0003] At present, the most commonly used electrogalvanizing method is the gravity tank method developed by ANDRITZ in 1985. The gravity elec...

AI Technical Summary

Problems solved by technology

However, due to the institutional form of the existing zinc melting tank, the liquid in the tank is in contact with the zinc particles in a large area, so there will still be a large amount of hydrogen generated within a certain period of time. Therefore, it is necessary to solve the contradiction between the contact area of ​​the zinc particles and the liquid. It does not affect normal production and is convenient for timely emptying

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