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High-temperature Oxidation-resistant Alloys: Recent Developments in Science and Applications

机译:高温抗氧化合金:科学和应用的最新进展

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摘要

Like the much broader field of corrosion science, high-temperature oxidation is often thought of as a traditional or mature field where the solutions to materials problems can be looked up in a text book or handbook and not much new ever happens. It is true that the fundamental thermodynamic and kinetic framework for understanding high-temperature oxidation was largely developed in the mid-twentieth century by Carl Wagner. However, the constant push for higher-efficiency and lower-cost industrial processes typically involves higher temperatures and more aggressive environments. In fact, energy efficiency is one of the keys to realistically addressing greenhouse gas emissions like CO_2 in the next decade. By improving efficiency, less CO_2 would be produced per kWh of electricity generated and the "extra" power can help offset the parasitic losses from the processes needed to reduce emissions or sequester the reaction products. For example, about 50% of the electricity in the United States comes from burning coal. Increasing the maximum temperature in coal-fired boilers from the current U.S. fleet average of ~550°C to 760°C would increase the net plant efficiency from 32% to 46% (using the higher heating value). This change equates to a reduction in fuel use and emissions of 30-33%.
机译:像腐蚀科学的广阔领域一样,高温氧化通常被认为是传统的或成熟的领域,可以在教科书或手册中查找材料问题的解决方案,而且从未发生过什么新的事情。的确,了解高温氧化的基本热力学和动力学框架是在20世纪中叶由Carl Wagner开发的。但是,不断寻求更高效率和更低成本的工业流程通常需要更高的温度和更恶劣的环境。实际上,能源效率是在未来十年中切实解决诸如CO_2之类的温室气体排放的关键之一。通过提高效率,每千瓦时发电将产生更少的CO_2,“额外”功率可以帮助抵消减少排放或隔离反应产物所需过程的寄生损失。例如,在美国,约有50%的电力来自燃煤。将燃煤锅炉的最高温度从目前的美国船队平均温度从550°C提高到760°C,将使工厂的净效率从32%提高到46%(使用更高的热值)。这种变化相当于减少了30-33%的燃料使用和排放。

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