Heating defoaming device

Abstract

The invention relates to a heating defoaming device. The heating defoaming device comprises a defoaming box installed at the upper portion of the side face of an alkali liquid circulating tank and multiple heating devices arranged in the defoaming box. Multiple foam inflow pipes are arranged on the side face of the defoaming box and connected with the alkali liquid circulating tank through foam inlets of the foam inflow pipes respectively. An alkali liquid backflow pipe is arranged at the bottom of the defoaming box and connected with the alkali liquid circulating tank through an alkali liquid backflow port. The heating defoaming principle is used, redundant foam in the alkali liquid circulating tank overflows and automatically flows into the defoaming box to be heated and broken, and the situation that production is affected due to the fact that other defoaming media are used and contaminates or dilutes alkali liquid is avoided.

Description

technical field [0001] The invention relates to a defoaming device, in particular to a heating and defoaming device for eliminating excessive foam in an alkali liquor circulation tank during degreasing production of cold-rolled strip steel. Background technique [0002] Before the steel strip is annealed, coated and other post-processing processes, it is necessary to set up a degreasing section to clean the grease on the surface of the rolled steel strip. During normal production, the degreasing liquid (usually also called lye) is recycled between the alkali washing tank and the lye circulation tank. Since the lye usually contains alkali and surfactants, it is mixed with air and washed and stirred. Under external conditions, a large amount of foam will inevitably be generated, and eventually the foam will accumulate in the lye circulation tank. Excessive foam will overflow from the circulation tank, which will not only cause the loss of active ingredients in the lye, affect...

AI Technical Summary

Problems solved by technology

But this method not only increases the production cost, but also because the defoamer is insoluble or slightly soluble in lye, it often exists as particles of a certain size, so it will accelerate the clogging of the cleaning nozzle and affect the degreasing production

In addition, refractory organic substances such as silicone or polyether contained in the defoamer enter the lye, causing lye pollution and increasing the difficulty of disposing of the invalid lye

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