Corrosion of heat exchanger materials in co-combustion thermal power plants

Kaiyang Li and Yimin Zeng

Renewable and Sustainable Energy Reviews, 2022, vol. 161, issue C

Abstract: Co-firing biomass and fossil fuel offers an alternative way of reducing greenhouse gas emission via adding CO2-neutral biomass fuel into power generation systems. However, the introduction of biomass in co-combustion system will change the physical and chemical features of flue gas and deposited fly ash, and can result in accelerated fireside degradation of heat exchangers through hot gas corrosion and molten salt corrosion. This article reviews the physical and chemical characteristics of co-combustion systems, the corrosion modes, the corrosive effects of different components (S, Cl, Pb/Zn, H2O, O2, CO2, temperature and ash), and corrosion behavior of Fe-based and Ni-based alloys as commonly used heat exchanger materials in co-combustion environments. Besides, the corrosion mitigation strategies (fireside additives and coatings) and the future research directions (influence of applied combustion technologies and gaseous fuel on corrosion, how to accurately measure corrosion rate, set up material selection strategy, investigation on the synergistic effect of corrosion and mechanical loading, corrosion prediction model) are summarized. It is anticipated that this article will help to better understand the corrosion behaviors and provide materials selection strategy for the construction of co-combustion systems.

Keywords: Co-combustion; Heat exchanger; Alloys; Corrosion; Flue gas; Molten salt (search for similar items in EconPapers)
Date: 2022
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DOI: 10.1016/j.rser.2022.112328

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