超临界二氧化碳布雷顿循环在发电机组中的应用和关键热端部件选材分析

Analysis of Supercritical Carbon Dioxide Brayton Cycle and Candidate Materials of Key Hot Components for Power Plants

对超临界二氧化碳布雷顿循环的技术特征进行了综述分析,评述超临界二氧化碳布雷顿循环在火电、核电和燃气等发电机组中的研发和应用现状;阐述以超临界二氧化碳作为循环介质时,发电机组关键高温部件对选材的要求;着重介绍几种典型铁素体耐热钢、奥氏体耐热钢和镍基高温合金在高温高压超临界二氧化碳气氛中的腐蚀行为和高温力学性能;展望电站超临界二氧化碳布雷顿技术中关键高温材料的发展方向。

The advantages of supercritical carbon dioxide Brayton cycle were analyzed based on the power system operation. The development of supercritical carbon dioxide Brayton cycle in fossil power, nuclear power and gas turbine power plants were reviewed. Candidate alloys used for the key hot components of the plants under supercritical carbon dioxide environment should have excellent corrosion resistance and mechanical properties. Therefore, the corrosion behavior of ferritic steels, austenitic steels and nickel based superalloys at different temperatures and pressures for supercritical carbon dioxide were investigated. The creep rupture life of several candidate materials at 650 ℃ was presented. Furthermore, some suggestions for supercritical carbon dioxide Brayton cycle were proposed from the aspects of material requirement.