CO2捕集相变溶液对304不锈钢及碳钢的腐蚀行为研究OA

Carbon steel is widely used in post-combustion CO2 capture projects in coal-fired power plants.However,it is prone to corrosion by organic amine absorbents during operation,which poses a significant threat to the stability of CO2 capture equipment.The N-(2-hydroxyethyl)ethylenediamine(AEEA)biphasic solvents was used as the research object to analyze the corrosion behaviors of 304 stainless steel(SS304)coupons and carbon steel coupons in AEEA biphasic solvents with different CO2 loading amounts(mass fractions)and amine mass fractions at 110℃.The results show that in AEEA biphasic solvents with different CO2 loading amounts and amine mass fraction of 40％,the corrosion rate of SS304 coupons present complex changing trend with the variation of CO2 loading amounts.Among them,the corrosion rate of SS304 coupons is the highest(both 0.0331 mm/a)in AEEA biphasic solvents with 75％and 25％CO2 loading amounts,and the lowest(0.0158 mm/a)in AEEA biphasic solvent with 100％CO2 loading(lean phase).In AEEA biphasic solvents with 100％CO2 loading amount and different amine mass fractions,the corrosion rate of SS304 coupons is positively correlated with the change of amine mass fraction.Among them,the corrosion rate of SS304 coupons is the highest(0.0327 mm/a)in the AEEA biphasic solvent with amine mass fraction of 60％,and the lowest(0.0115 mm/a)in the AEEA biphasic solvent with amine mass fraction of 20％.Compared with carbon steel coupons,SS304 coupons have lower corrosion rate under the same conditions.Therefore,SS304 is more suitable as the main material for towers,pipelines and other equipments in large-scale CO2 capture projects.