Corrosion issues in restructured spray air cooling
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Our unit is a French IFP II-generation continuous reformer, and the reaction products are cooled by evaporative air coolers. Corrosion of the tube bundles occurred during operation; new air coolers have now been installed, but the corrosion problem has not been completely resolved. Do any of you have any good suggestions? Thank you! The measures we took before were to add corrosion inhibitors to the circulating cooling water, and we tried several different brands of such inhibitors, but the effect was not very significant.
Based on our experience, demineralized water is used, and no corrosion has occurred.
We also used demineralized water; it started to corrode and leak two years after operation began. Later, a secondary line was added to facilitate on-line maintenance
Friend of the poster, it’s possible that you are adjusting the chlorine dosage or water content too much; we keep the chlorine content on our catalysts at 0. 95 to 1.05%, with the water content kept below 3 ppm; you may use this as a reference for comparison.
Our chlorine level is kept between 0.9 and 1.1; the water conditions are the same as yours. It’s obvious that there is severe corrosion on the outside of the air-cooled pipelines. Our research institute has been monitoring this situation for half a year, but no conclusions were reached, and the matter was left unresolved.
We use demineralized water, so corrosion is not that noticeable.
1. Demineralized water must be used first. 2. Regular sludge discharge is necessary. 3. An anti-corrosion coating should be applied to the outside of the tube bundle. 4. Corrosion inhibitors should be added to the circulating water