海洋环境下燃气轮机涡轮叶片的热腐蚀与防护

摘要

涡轮叶片热腐蚀是海洋环境工作下的燃气轮机的典型故障之一,也是决定涡轮叶片使用寿命的主要限制因素之一.简要分析了我国沿海地区海洋环境的特点以及涡轮叶片热腐蚀的特点,讨论了燃气轮机涡轮叶片的热腐蚀机理和影响因素,结果表明叶片表面温度、燃气中的盐含量以及燃油中的硫与钒是导致热腐蚀的重要因素.最后,着重从选材、涂层应用和维护等方面,提出了燃气轮机涡轮叶片热腐蚀的防护措施.%The hot corrosion of turbine blades is one of the typical failures which occur in during operation in marine environment, and is also one of the main limits of blade service life. The characteristics of our marine environment and the corrosion characteristics of the turbine blades were analyzed. The mechanism and influencing factors of hot corrosion were discussed. It was concluded that the surface temperature of turbine blade, salt content of fuel gas, and the content of sulfur/vanadium in the fuel were the important factors of hot corrosion of turbine blades. The preventive measures for the hot corrosion of turbine blades were put forward from the aspects of material selection, coating application and maintenance.