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10200 Fireside Corrosion of Superheater Materials in Oxyfuel Combustion

Picture for 10200 Fireside Corrosion of Superheater Materials in Oxyfuel Combustion
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Product Number: 51300-10200-SG
ISBN: 10200 2010 CP
Author: P Pohjanne, S Olli, Pi Auerkari, P Jauhiainen, E Turunen, T Varis, K Ruusuvuori, M Makipaa, S Tuurna
Publication Date: 2010
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Oxyfuel combustion is considered as one of the most promising technologies to facilitate CO2 capture from flue gases. From the conventional air-fired combustion the oxyfuel process differs by involving combustion atmospheres with reduced nitrogen and much increased levels of recirculated flue gas. The difference also affects the formation and chemistry of deposits, and risk of corrosion on the fireside surfaces.

Corrosion resistance of three conventional superheater tube steels T22 (10CrMo9-10, with and without Ni-50Cr thermal spray coating), 11Cr (X20CrMoV11-1) and alloy 347 were evaluated under simulated oxyfuel combustion environments (3.6% O2 – 60% CO2 – 30% H2O – 6.4% Ar) at 580°C. Reference tests were performed at the same temperature in an atmosphere simulating conventional airfired coal combustion (1.8% O2 – 74.2% N2 – 16% CO2 – 8% H2O). Test duration was up to 1000 h in all cases. Corrosion resistance was evaluated through metallographic examination and weight loss measurements. Results are presented and future research needs are discussed.
Oxyfuel combustion is considered as one of the most promising technologies to facilitate CO2 capture from flue gases. From the conventional air-fired combustion the oxyfuel process differs by involving combustion atmospheres with reduced nitrogen and much increased levels of recirculated flue gas. The difference also affects the formation and chemistry of deposits, and risk of corrosion on the fireside surfaces.

Corrosion resistance of three conventional superheater tube steels T22 (10CrMo9-10, with and without Ni-50Cr thermal spray coating), 11Cr (X20CrMoV11-1) and alloy 347 were evaluated under simulated oxyfuel combustion environments (3.6% O2 – 60% CO2 – 30% H2O – 6.4% Ar) at 580°C. Reference tests were performed at the same temperature in an atmosphere simulating conventional airfired coal combustion (1.8% O2 – 74.2% N2 – 16% CO2 – 8% H2O). Test duration was up to 1000 h in all cases. Corrosion resistance was evaluated through metallographic examination and weight loss measurements. Results are presented and future research needs are discussed.
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