How to reduce corrosion of equipment by amine (MEA, MDEA, etc.) solutions in the natural gas desulfurization process
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As the title suggests: In natural gas desulfurization and decarbonization processes, how can corrosion of equipment by amine (MEA, MDEA, etc.) solutions be reduced? What type of material is generally used for corrosion-resistant components? I seek advice from experts Thank you in advance!
The corrosion in the desulfurization system is closely related to process control; meanwhile, the installation of amine injection for revival can also be considered.
The steel used for desulfurization equipment is equivalent to 15CrMo; the upper part of the C-removal stripping tower equipment is made of 316, while the lower part is made of 16MNR. I’m also very interested in knowing the reasons for corrosion; please advise. Desulfurization is carried out using the MDEA process, while desulfurization and hydrogenation are used as well
Both the acid gas load and the removal of degradation products are important
In the first half of the year, an RBI project on a purification unit was carried out. Through analysis, the main corrosion mechanisms involved in this unit were: internal corrosion leading to thinning (uniform and localized), H2S-CO2-H2O corrosion, R2NH-H2S-CO2-H2O corrosion, high-temperature sulfidation corrosion, external damage, atmospheric corrosion, CUI, stress corrosion cracking, sulfide stress corrosion cracking (SSCC), hydrogen-induced cracking and stress-oriented hydrogen-induced cracking (HIC/SOHIC), amine stress corrosion cracking, and carbonate stress corrosion cracking