Frequent crackings and failures of boiler heating surfaces are one of the important factors that restrict the flexible and efficient operation of coal-fired power units.Multiple methods such as macroscopic inspection,metallographic experiments,microscopic morphology analysis,energy spectrum analysis,and hardness testing are applied to carry out in-depth research on the transverse cracking phenomena of waterwall tubes in boilers of ultra-supercritical power plants.Analysis is conducted on the causes of such problems,the cracking mechanism of waterwall is illustrated,and suggestions on operational adjustment are proposed to mitigate thermal expansion and fatigue of waterwall.Innovative practices in the safety evaluation of flexible peak regulation for coal-fired units are completed.
关键词
超超临界锅炉/水冷壁管/横向开裂/壁温
Key words
ultra-supercritical boiler/waterwall tube/transverse cracking/wall temperature
维普
万方数据