为了有效评估燃料气中H2S超标对燃气轮机涡轮叶片热腐蚀的影响，在腐蚀机理研究基础上结合燃机的运行参数条件，采用热力学模拟方法完成了对25 MW燃气轮机涡轮叶片热腐蚀风险评估分析。通过分析杂质含量变化及燃料类型对腐蚀产物露点曲线的影响，得出了碱金属含量是涡轮叶片热腐蚀的关键影响因子，在（Na+K）质量分数小于1×10-5%的条件下，即使当H2S体积分数达到0.01%时，涡轮叶片也不会面临热腐蚀风险。这将对海上平台用国产25 MW燃气轮机燃料中杂质含量目标控制和高温涡轮叶片防护涂层设计起到了一定的参考作用。

Thermodynamics modelling method was used to evaluate hot corrosion risk of turbine blade of 25 MW gas turbine with excessive H2S in fuel gas.By analyzing the influence of impurities and fuel types,the results clearly indicate that the content of alkalimetals is the crucial parameter for the risk of hot corrosion in gas turbines.However,the hot corrosion risk will not occur on the turbine blade if the content of (Na+K) is less than 1×10-5%,even under the condition of 0.01% of H2S.These results are believed to serve as guideline and reference for the impurity content control and the design of protective coating for high temperature turbine blade used in 25 MW gas turbine for offshore platform.

TK473

国家自然科学基金(51876107)