摘要
发展富氧燃烧技术和提高锅炉的蒸汽参数可以有效减少燃煤电厂的CO_(2)排放,有助于火力发电行业实现“碳达峰-碳中和”的目标,但采用上述技术对锅炉材料的抗CO_(2)高温腐蚀性能和高温蠕变强度提出了更高要求,镍基合金有望成为优选材料。针对先进超超临界发电机组富氧燃烧烟气高含CO_(2)的特点,本文综述了目前关于Ni-Cr合金在富CO_(2)气氛中的高温腐蚀研究成果,重点介绍了CO_(2)气氛对Ni-Cr合金热生长Cr_(2)O_(3)保护膜的影响,阐明了Ni-Cr合金在CO_(2)气氛中发生碳化的机理,总结了富CO_(2)气氛中的H_(2)O(g)、SO_(2)、环境温度和合金元素对Ni-Cr合金抗高温腐蚀性能的影响,进而提出未来关于Ni-Cr合金在富CO_(2)气氛中的高温腐蚀需深入研究的问题,包括:解析Ni-Cr合金在不同气氛中热生长Cr_(2)O_(3)膜的微观精细结构,探明CO_(2)、H_(2)O(g)和SO_(2)与稀土元素在氧化膜晶界处的交互作用,关注富CO_(2)气氛中的HCl(g)组分对Ni-Cr合金形成Cr_(2)O_(3)保护膜的影响。
The thermal power generation industry in China is facing heavy pressure from environmental protection sectors as the“emission peak-carbon neutrality”goal has been proposed.Oxyfuel combustion and operating with high steam parameters are considered promising technologies that can effectively reduce CO_(2) emissions from coal-fired power plants.However,using these two technologies,the currently used ferritic/martensitic heat-resistant steels and austenitic stainless steels in traditional boilers cannot meet the requirements of good creep strength and corrosion resistance to hot CO_(2)-rich gasses.Thus,nickel-based alloys must be considered.Given that flue gasses related to oxyfuel combustion are characterized by high CO_(2) concentrations,this work reviews recent research progress on the hightemperature corrosion of Ni-Cr alloys in CO_(2)-rich gasses.Herein,the effect of CO_(2) on protective Cr_(2)O_(3) scale formation is introduced,and the related carburization mechanism caused by CO_(2) ingress is clarified.Moreover,the impacts of H_(2)O(g),SO_(2),temperature,and alloying elements on the high temperature resistance of Ni-Cr alloys in CO_(2)-rich gasses are summarized.Based on the current findings,future research on high-temperature corrosion of Ni-Cr alloys in CO_(2)-rich gases should focus on the following key points,such as analyzing the microstructure of Cr_(2)O_(3) scales formed in different gasses;elucidating the interaction of CO_(2),H_(2)O(g),and SO_(2) molecules with rare earth elements at grain boundaries of oxide scales;and investigating the effect of HCl(g)impurities in CO_(2)-rich gasses on Cr_(2)O_(3) scaling of Ni-Cr alloys.
作者
谢云
Jianqiang Zhang
彭晓
XIE Yun;Jianqiang Zhang;PENG Xiao(School of Materials Science and Engineering,Nanchang Hangkong University,Nanchang 330063,China;School of Materials Science and Engineering,University of New South Wales,Sydney 2052,Australia)
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2024年第6期731-742,共12页
Acta Metallurgica Sinica
基金
国家自然科学基金项目No.52301089
江西省重点研发计划项目No.20232BBE50007
江西省自然科学基金项目No.20224BAB214018。
