Abstract: Advanced pressurized oxy-fuel combustion technologies have been developed to achieve the targets of significant CO2 emission reduction and remarkably high energy conversion efficiency in a cost-effective manner. The corrosion of flue gas components poses a challenge on the plant construction since the designed operating environments (e.g., temperature, pressure, and gas chemistry) are significantly different from those at conventional fossil fuel-fired plants. Candidate constructional alloys, such as austenitic stainless steels, duplex stainless steels and Ni-based alloys, have been pre-selected based on our comprehensive literature review on previous laboratory-scale studies and field inspection results at conventional air-fuel power plants. To further identify their corrosion behavior under the designed oxy-fule conditions, standard immersion tests based on ASTM G31 in simulated condensed phase and hot gas chemical corrosion test in an autoclave containing the specific flue gas mixture at elevated temperatures were performed and the corrosion processes were evaluated based on weight change measurements. Moreover, microscopy techniques were also employed to characterize the formed corrosion products for advancing corrosion mechanistic understanding.
Authors: Yimin Zeng, Kaiyang Li, and Jing-li Luo
Keywords: Flue gas, Pressurized Oxy-fuel Combustion, P91, SS310