Corrosion in CO2 capture unit for coal-fired power plant flue gas

This paper reviews the knowledge of corrosion and corrosion control in the CO2 capture unit using reactive amine solvents. Plant experiences and the impacts of operating parameters on corrosion in the amine unit are addressed. The key operating parameters are amine type, amine concentration, solution temperature, CO2 loading, solution velocity, and degradation products. The corrosion data obtained from our laboratory experiments as well as from the literature over the decades were integrated to establish the interrelationship between such operating parameters and corrosion rate. This paper also reviews all the corrosion mechanisms that are commonly used to characterize corrosion phenomena in this particular CO2-amine system as well as the one that was identified by our rigorous corrosion model. In addition, the information on corrosion control and our work on low-toxic corrosion inhibitors are also provided.