Abstract
In the current paper, the temperature conditions and furnace atmosphere of the boiler water-wall were simulated in the tube furnace where the pulverized coal (PC) is burned. The SA213-T22 steel widely used for the water-wall tube material of ultra-supercritical boiler was taken as the sample to conduct the corrosion experiment, and the electron scanning microscope SEM and X-ray energy spectrometer (EDS) were used to make the analysis of the corroded sample and to investigate the impact of the factors like temperature, corrosion atmosphere etc. on high-temperature corrosion. The results show that in the corroded sample, the sulfur content increases remarkably with the drop of the oxygen concentration in the flue gas, but it is not related greatly to the temperature. However, the impact of temperature on the structure of the corroded material is conspicuous. The oxides on the surface of the corroded sample are mainly Fe_3O_4 and Fe_2O_3. The higher the temperature and the ambient oxygen concentration, the thicker the oxide layer.
