Impact research of chloride ions on 316L corrosion in FCC flue gas ammonia desulfurization environment
There are corrosive medium with high-concentration chloride ions in concentration section,absorption section and oxi-dation section of absorption tower in FCC flue gas ammonia desulfurization unit.The existence of chloride ions may cause serious corrosion problems and affect long-term operation of the unit.The methods of electrochemistry and immersion test were applied to investigate chink corrosion resistance,pitting corrosion and uniform corrosion of 316L under simulated working condition.Appli-cable range of chloride ion concentration for 316L was determined.The studies indicated that for absorption section,oxidation section(≤ 60 ℃),and concentration section(≤65 ℃),the standard boundary for chloride ion concentration is 11 000 μg/g,and its limit boundary is 14 000 μg/g.
flue gas desulfurization316L stainless steelchloride ion corrosionammonium sulfate corrosion
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