Controlling nickel-base alloy high temperature corrosion in CO2-rich gases

煤炭为澳大利亚提供了廉价的能源，但却排放了大量的二氧化碳。解决方案是提高燃煤电厂的效率，并使用二氧化碳捕获技术。这是可行的，通过提高蒸汽温度和使用氧燃料过程，煤在氧气中燃烧，而不是在空气中。因此，热燃烧气体中含有丰富的二氧化碳和水蒸气，但在高温下具有很强的腐蚀性。传统的钢材是不够的。取而代之的是镍基合金。该项目旨在研究镍基合金在二氧化碳-水环境中的腐蚀行为，以及通过控制气体成分和适当合金化来防止这种腐蚀的方法，这对下一代发电厂的设计至关重要。

Coal provides cheap energy for Australia but emits carbon dioxide (CO2) in large quantities. The solution is to improve the efficiency of coal fired power plants and use CO2 capture technology. This is feasible by raising steam temperatures and using oxyfuel process where coal is burnt in oxygen rather than in air. Thus the hot combustion gas is very rich in CO2 plus water vapour, which is however very corrosive at high temperatures. Traditional steels are inadequate. Instead, nickel-base alloys are needed. This project aims to investigate the corrosion behaviour of nickel base alloys in carbon dioxide - water atmospheres, and ways of preventing this corrosion by controlling gas composition and appropriate alloying, which is essential for next generation power plant design.