630-700℃超超临界燃煤电站耐热管及其制造技术进展

Systematical Innovation of Heat Resistant Materials Used for 630~700 ℃ Advanced Ultra-Supercritical(A-USC)Fossil Fired Boilers

迄今,600℃超超临界是世界最先进商用燃煤电站技术。630~700℃超超临界燃煤电站研发将奠定我国火电技术的国际领先地位,对实现国家节能减排目标具有重要战略意义。耐热材料是制约火电机组蒸汽温度进一步提升的技术瓶颈,本文简述了国内外630~700℃超超临界电站耐热材料研制现状,指出了我国急需研发的关键耐热材料。阐述了作者团队在多年实践中总结的电站耐热材料"全流程选择性冶金过程设计和选择性强韧化设计"观点,重点介绍了在该设计观点指导下,我国成功研发了用于630~650℃的马氏体耐热钢G115~?,用于650~700℃的固溶强化型镍基耐热合金C-HRA-2~?、C-HRA-3~?,以及用于700~750℃的析出强化型镍基耐热合金C-HRA-1~?,系统构建了我国630~700℃超超临界燃煤锅炉耐热材料体系,并已成功制造了上述新型耐热材料锅炉管。

To date, the 600 ℃ ultra-supercritical(USC) fossil fired power plant is the most advanced in the world. The research and development of 630~700 ℃ advanced ultra-supercritical(A-USC) fossil fired power plant will lay the thermal power technology in China in the international leading position,which is of important strategic significance to realize the national energy conservation and emissions reduction targets. Heat resistant material is the technical necking to further increase the steam parameter of thermal power plants. This paper briefed the-state-of-the-art of heat resistant materials used for 630~700 ℃ A-USC fossil fired power plant worldwide and clarified the critical candidate materials which are on the top priority to develop in China. The selective metallurgical processing design and selective strengthening mechanism, concluded by the author to design and improve heat resistant materials, was introduced. Under the guidance of the selective strengthening mechanism, G115~?martensitic steel used for630~650 ℃, C-HRA-2~?and C-HRA-3~?alloy used for 650~700 ℃, and C-HRA-1~?alloy used for 700~750 ℃ have been successfully developed, which built a complete heat resistant material system to cover630~700 ℃ A-USC fossil fired power plant. The boiler tubing and piping of these novel heat resistant materials have been industrially manufactured.