Acidic wet hydrogen sulfide corrosion in petrochemical industries
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This post was last edited by Wang Wei2 on 2024-5-24 at 11:10. Acidic wet hydrogen sulfide corrosion in the petrochemical industry: 1. Wet hydrogen sulfide without ammonia is acidic (with a pH between 4.5 and 7.0), representing a highly corrosive environment; since a dense iron sulfide protective layer cannot be formed, the corrosion manifests as uniform corrosion, and the metal sheets are also prone to hydrogen-induced cracking； 2. Devices and equipment prone to problems, such as gasoline hydrogenation units, light hydrocarbon recovery systems, the gas liquid separation tanks in the quench tower systems of sulfur processing plants, and the bottoms of defective spherical tanks ； 3. Corrosion prevention measures: ① Remove the bottom 3 rows of tubes from the cooler to prevent rust accumulation from causing electrochemical corrosion beneath the scale ； ② Apply coating to the inner wall of the equipment or the heat exchange tubes ； ③ Use 0Cr13 or 321 stainless steel ； 4. Other measures to mitigate wet hydrogen sulfide corrosion: Use stainless steel composite panels (carbon steel + 0Cr13) ； u Non-metallic coating on the surface ； u Flush with water, maintain pH at 7-8 ； Injecting the ammonium polysulfide corrosion inhibitor (2Sx) can convert cyanides into harmless thiocyanates, thereby controlling HCN
Petrochemical acidic wet hydrogen sulfide corrosion is a severe corrosive environment caused by a lack of ammonia, and it is common in units such as gasoline hydrogenation and light hydrocarbon recovery. Corrosion prevention measures include cooler modifications, coating the inner walls, and using stainless steel materials. Other mitigation measures include the use of stainless steel composite panels, non-metallic coatings, water injection for cleaning, and the addition of corrosion inhibitors. .