Considering that high-temperature corrosion of boiler water-cooled wall surfaces can cause cracks in the wall tubes and lead to leak-age accidents,in order to obtain the factors affecting high-temperature corrosion of boiler water-cooled wall surfaces,a test study on high-tem-perature corrosion of boiler water-cooled wall surfaces and transverse crack leakage of wall tubes is proposed.Failure analysis was conducted on transverse cracks in the high-temperature corrosion zone of boiler water-cooled walls.Through macroscopic observation,material analysis,and non-destructive testing,the causes of transverse cracks in boiler water-cooled wall pipes were studied and analyzed.Based on the principle of high-temperature corrosion experiments on boiler water-cooled wall surfaces,the gas conditions were determined.Through the preparation of sample blocks,a high-temperature corrosion experimental plan for boiler water-cooled wall surfaces was designed.The influence of atmosphere conditions and temperature on high-temperature corrosion of boiler water-cooled wall surfaces was tested.The results show that the more H2S content and temperature in boiler flue gas,the more severe the wall corrosion of boiler water-cooled walls under the combined effect of thermal fatigue stress and high temperature caused by wall temperature fluctuations,resulting in transverse cracks in the wall tubes and leakage.
关键词
高温腐蚀/横向裂纹/锅炉水冷壁/泄漏试验/腐蚀速率/壁面厚度
Key words
high temperature corrosion/transverse crack/boiler water wall/leak test/corrosion rate/wall thickness
维普
万方数据