Typical Corrosion and Protection of Petrochemical Hydrogenation Unit

Abstract

Through the analysis of typical corrosion cases and the distribution of corrosion media, the corrosion patterns of petrochemical hydrogenation units were summarized. The main types of corrosion were identified as: crystallization of NH4Cl and under-deposit corrosion in the reaction effluent system, erosion corrosion by NH4HS, dew point corrosion by HCl and wet H2S corrosion in the circulating hydrogen desulfurization tower and stripping tower. The key influencing factors of various typical corrosion mechanisms in hydrogenation units were identified, and targeted corrosion protection measures were proposed, encompassing the selection of equipment and pipeline materials, optimization of operation and enhancement of corrosion monitoring and detection. This paper offered significant guidance for reducing the risk of equipment and pipeline corrosion and ensuring the long-term safe operation of hydrogenation units.

Keywords

• hydrogenation device; under-deposit corrosion; nh₄cl crystallization; nh₄hs erosion corrosion; wet h₂s corrosion; corrosion protection