How to deal with scaling on the inner wall of an electromagnetic flowmeter?
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The inner walls of the electromagnetic flowmeters in the primary brine system of chlor-alkali chemical plants often become scaled, and the two electrodes are also blocked. Upon disassembling the electromagnetic flowmeter, it was found that the scale layer on the PFA-lined inner wall was approximately 3 mm thick and quite hard in texture. What are some good ways to deal with scale buildup?
Scale buildup? Hit it with a hammer, chop it with a knife, lift it with an iron shovel, or lick it with your tongue. . . I really can’t think of any other way. .
Generally, after disassembly, the electrodes are rinsed with dilute hydrochloric acid
If it is carbonate scale, cleaning it with dilute hydrochloric acid yields very good results. If it is sulfate scale, hydrochloric acid cannot remove it quickly; some patience is required.
To analyze the composition of scale, both acidic and alkaline solutions can be used
When selecting, a scraper type should be chosen as it allows for online cleaning.
Pick up the sub-scrapper manually? Use pickling? I can’t think of any other methods; should the electrode be in the shape of a bullet tip? Or those with a brush-like design; using a scraper to clean this stuff isn’t very reliable, as there are multiple moving mechanical parts that introduce points of instability, and it’s not necessarily possible to clean it thoroughly