Strip steel alkali washing section foam co-processing device and method

Abstract

The invention discloses a strip steel alkali washing section foam cooperative processing device and a strip steel alkali washing section foam cooperative processing method. Different defoaming devices are respectively arranged in a foam easy-to-generate and overflow area of the alkali liquor circulating tank, namely a reflux inlet and a steam coil overhaul flange plate at the top and an overflow port on the side surface; wherein the reflux inlet is provided with an ultrasonic defoaming device, on one hand, a foam liquid film is broken and defoamed by utilizing high-frequency sound pressure of ultrasonic waves, and on the other hand, gas in liquid is eliminated, and the amount of gas entering the tank body is reduced; an electric heating defoaming device is arranged at an overflow port, and when foam approaches the area, gas expands and a liquid film is thinned, so that the defoaming purpose is achieved; an atomization dosing device is arranged at the position of the flange plate, and foam is eliminated in the mode of adding a defoaming agent in an atomization mode. According to the invention, ultrasonic defoaming, electric heating defoaming and atomization dosing defoaming are adopted for cooperative treatment, so that foams are quickly and efficiently eliminated from the angles of reducing the strength of a liquid film or increasing the instability of gas in the foams and the like.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a foam synergistic treatment device and method in a strip steel alkali washing section. Background technique [0002] In the alkaline cleaning and degreasing process section of strip steel, due to a series of physical and chemical effects such as the aging of alkaline solution, high alkaline cleaning temperature, saponification of grease, and disturbance of alkaline spraying and alkaline brushing, a large amount of foam is generated in the alkaline liquid circulation tank, and the foam will flow from the top of the tank due to buoyancy. Flange sealing surface, overflow port and other places overflow. The foam itself is a thermodynamically unstable system. When the gas enters the solution containing the surfactant, it will form a long-term stable foam system. The overflow of the foam will sharply deteriorate the on-site operating environment on the o...

AI Technical Summary

Problems solved by technology

However, the generation of foam in the alkali washing and degreasing process section has the characteristics of large amount (a large amount of foam is produced in a short time), high stability (containing lye active ingredients), and fineness (very small foam size, high foam strength), etc. Conventional single physical means For example, centrifugation, water spray, decompression, etc. are difficult to apply to large and delicate foams, while conventional single chemical means add defoamers to act on the main body of lye, which will cause large amounts and seriously pollute lye, reduce cleaning efficiency and block pipelines

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