Oxidation mechanisms of metallic carrier materials for gas separation membranes in power generation systems with carbon dioxide capture

假设核电进一步减少，在广泛使用可再生能源供应能源之前，唯一可用的桥接技术可以由传统发电厂提供。二氧化碳捕获和储存（CCS）技术可以抵消二氧化碳排放量的不希望的增加。实现这一技术目标的最有效方法是引入使用陶瓷膜技术的气体分离技术。然而，迄今为止，几乎没有对用于气体分离系统的组装的金属支撑结构的开发进行任何研究。金属载体必须在温度高达1000°C的不同浓度的O2、N2、H2、H2O、CO2和CO的使用环境中具有高耐腐蚀性。本项目的目的是在这种复杂的服务环境中的氧化机制的基本方面的调查。根据工艺要求，所研究的合金将是氧化铝成型材料，主要基于NiCrAl或NiCoCrAl合金。用于研究混合气体环境中的氧化过程的实验方法包括使用稳定的气体示踪剂，如18O2，H218O，C18O2和使用色谱的原位气相分析。各种分析方法，特别是传统的和高分辨率的TEM将被用来研究在不同的长度尺度上的块体合金的规模的形成机制和微观结构的变化。在双边方法中获得的基本知识将用于开发新的和改进的合金概念。

Assuming a further decrease of nuclear power and before energy supply by extensive use of renew-able sources is available, the only available bridging technology can be provided by conventional power plants. The undesired increase in CO2 emissions can be counteracted by carbon dioxide capture and storage (CCS) technologies.The most efficient way to reach this technological goal is by introducing gas separation techniques using ceramic membrane technology. However, until now hardly any investigations have been carried out on the development of metallic support structures for the assembly of the gas separation systems. The metallic carriers must possess high corrosion resistance in service environments with varying concentrations of O2, N2, H2, H2O, CO2 and CO at temperatures up to 1000°C. The present project aims at an investigation of the fundamental aspects of the oxidation mechanism in such complex service environments. Based on the technological requirements, the alloys to be studied will be alumina forming materials, mainly on the basis of NiCrAl or NiCoCrAl alloys. The experimental methods used to study the oxidation processes in the mixed gas environments include the use of stable gaseous tracers such as 18O2, H218O, C18O2 and in-situ gas phase analysis using chromatography. Various analysis methods, especially conventional and high resolution TEM will be employed to investigate the scale formation mechanisms and microstructural changes in the bulk alloy on various length scales. Basic knowledge gained in the bilateral approach will be used to develop new and improved alloy concepts.