Corrosion of Heat Transfer Materials by Potassium-Contaminated Ilmenite Bed Particles in Chemical-Looping Combustion of Biomass

Jan-Erik Eriksson, Maria Zevenhoven, Patrik Yrjas, Anders Brink and Leena Hupa
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Jan-Erik Eriksson: Johan Gadolin Process Chemistry Centre, Åbo Akademi University, 20500 Turku, Finland
Maria Zevenhoven: Johan Gadolin Process Chemistry Centre, Åbo Akademi University, 20500 Turku, Finland
Patrik Yrjas: Johan Gadolin Process Chemistry Centre, Åbo Akademi University, 20500 Turku, Finland
Anders Brink: Laboratory of Process and Systems Engineering, Åbo Akademi University, 20500 Turku, Finland
Leena Hupa: Johan Gadolin Process Chemistry Centre, Åbo Akademi University, 20500 Turku, Finland

Energies, 2022, vol. 15, issue 8, 1-14

Abstract: This study discusses the potential corrosion of boiler materials in chemical-looping combustion (CLC) of biomass. The CLC of biomass has the potential to negative CO 2 emission in heat and power production. Biomass fuels, however, typically contain compounds of alkali metals, especially potassium and chloride, which may lead to the corrosion of heat-transfer surfaces in the reactors. The influence of potassium-contaminated ilmenite bed material deposits on the corrosion of seven heat transfer materials used in the air and fuel reactors in CLC was studied using one-week lab-scale experiments. Samples with KCl and without any deposit were used as references. After the exposure, the cross-sectional surfaces of the metals were analyzed with SEM/EDX. The results suggested that potassium-contaminated ilmenite might lead to minor corrosion of all studied materials under the oxidizing conditions simulating the air reactor, i.e., 700 °C and dry air. Under reducing fuel reactor conditions, i.e., 450 °C and 550 °C and 50/50 CO 2 /H 2 O, corrosion was observed on ferritic steels, especially in the presence of HCl and with KCl deposit. In contrast, samples with uncontaminated and potassium-contaminated ilmenite deposits did not significantly differ from the samples without any deposit. Minor corrosion of ferritic steels was observed at 450 °C, while at 550 °C, the corrosion was more significant. The results suggested that ferritic steels are not suitable for the fuel reactor. Austenitic and nickel-based alloys did not corrode under the test conditions used in this work.

Keywords: chemical looping combustion; ilmenite; corrosion; heat transfer (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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