Two and a half years since the start of operation of the waste acid regeneration system, near the acid pipe under the second absorption tank
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Two and a half years have passed since the waste acid regeneration unit was put into operation, and the ceiling in the area near the acid outlet pipe of the second acid absorption tank is severely corroded; acid is leaking from the corrosion holes. I believe the problem might lie with the acid pump, but the corroded area is not on the side of the pump’s outlet. The equipment team’s analysis suggests that the impact of the acid injection pipe caused the acid to splash onto the ceiling, leading to corrosion; I hope fellow users can help with this analysis!
What are the components and temperature of the waste acid? What is the material of the ceiling, and is it treated to prevent corrosion? If so, what is the treatment method used, and what materials are employed? What is the height of the top plate above the acid level? Is there any specificity to the location of corrosion (edges? Weld? Convex surface? Concave surface? ）? Details are often key to analyzing a problem; it’s best to include photos!
It’s possible. Corrosion by acidic gases. The corrosion rate depends on the acid concentration and temperature, the material of the roof, and whether anti-corrosion treatment has been applied
Add a baffle above the pump suction inlet.
There are reasons related to splashing as well as acid gas; when there is a leak, replace it with a new one and enhance corrosion protection； Without altering the overall material properties, either thickening it or applying acid- and alkali-resistant anti-corrosion coatings will suffice
Thank you, that’s what I’m doing currently as well
The top plate lacks anti-corrosion protection; the sleeves in the acid inlet tank of the absorption tower are prone to corrosion
It should be a problem of intergranular corrosion.
I’d like to ask the experts: what is intergranular corrosion?
It is corrosion that spreads inward along the boundaries between metal grains. It doesn’t show any signs of problems on the outside; it just stops working when tapped