Study on Acid Corrosion Characteristics in Low-Pressure Stage Initial Condensation Zone of Supercritical H 2 O/CO 2 Turbine

• Published in: IOP Conference Series: Materials Science and Engineering
• Main Authors: Ma, Zi-yue, Wang, Xiao-fang, Jiang, Tao, Wang, Wei, Xu, Yang
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: IOP Publishing 2021
• Subjects: Carbonic acid
• Online Access: http://dx.doi.org/10.1088/1757-899x/1081/1/012008; https://iopscience.iop.org/article/10.1088/1757-899X/1081/1/012008; https://iopscience.iop.org/article/10.1088/1757-899X/1081/1/012008/pdf

Abstract Compared with the traditional steam turbine, the supercritical H 2 O/CO 2 turbine has a relatively high CO2 content in the working fluid. In the initial condensation zone, CO 2 dissolves in the condensed water to form carbonic acid, which intensifies the corrosion of blade. In order to study the acid corrosion characteristics in the initial condensation zone of supercritical H 2 O/CO 2 turbine, the acid corrosion rate of the blades in the initial condensation zone of supercritical H 2 O/CO 2 turbine was calculated and analyzed based on the numerical model of non-equilibrium condensation flow and a numerical model of CO 2 corrosion reaction. The results show that the temperature, pressure, proportion of CO 2 in the gas phase and thickness of the solution on blade surface are the main factors affecting the acid corrosion rate in the initial condensation zone of the turbine. The influence of temperature and pressure is more significant. Overall, the acid corrosion rate decreases stage by stage.