【Cutting-edge Technology】New materials for power plant boilers with the highest parameters in the world approved for use

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This post was last edited by *nht1 on 2023-7-31 at 08:58. Source: **State Administration for Market Regulation. Publication date: 2023-05-30 at 19:14. Previously, the State Administration for Market Regulation approved the trial use of G115 steel in two ultra-supercritical (1000MW) coal-fired power plant boilers at Yuncheng Power Plant of China Datang Group. With this, G115 steel has officially entered the stage of practical use in engineering applications, marking a significant breakthrough in the use of new high-temperature materials for boilers in China. This development holds great strategic importance for promoting energy savings and emission reduction in power plant boilers and for helping to achieve the \"dual carbon\" goals. It will also further advance China’s efforts to achieve self-reliance in high-tech new materials, thereby ending the long-term reliance on imported key heat-resistant materials. Copy and search the original text: New materials for power station boilers with the highest parameters in the world approved for use (samr.gov.cn). Additional information: Related technical articles. Copy the title and search: New material 08Cr9W3Co3VNbCuBN (G115) for power station boilers with the highest parameters in the world approved for engineering use (qq.com). Feel free to provide additional information and share your opinions. @Cleaner @ZhongyuanRen @FishInTheDesert Below are my modest insights and understanding of the technologies and materials related to boilers over the years. Since I’m not trained in boiler technology or related materials, please feel free to point out any inaccuracies in what I’ve written. Based on my experience, I believe that G115 steel represents true cutting-edge technology, and it is in these fundamental areas that we need to improve our skills in the future. I remember that in school, the teacher asked a question about what the highest temperature that water vapor can reach is. At that time, we didn’t have any practical experience or knowledge; all our information came from the teacher and textbooks. We had never seen what a boiler actually looked like, nor did we know how hot the steam produced by boilers could get. Some people said the critical temperature was 347.15°C (at which point the density of steam is equal to that of water), while others mentioned 500°C. The 500°C figure comes from the textbooks, with no further details provided. A few people said the temperature could be very high, with no upper limit. Later, the teacher concluded that steam temperatures could exceed 500°C, but that boilers and other equipment were limited by the materials used, so the steam temperature couldn’t go any higher—that represented the practical limit. The theoretical limit, on the other hand, is the decomposition temperature of water under the influence of temperature; some sources suggest this temperature is 2400°C, at which point ordinary steel would already have melted (the melting point of carbon steel is between 1400 and 1500°C). Later, I became aware of the projects related to the upgrading of condensate treatment systems, and I understood the principle of boiler operation – how water turns into steam, how steam turns into condensate, how condensate turns back into flash vapor, what saturated steam and superheated steam are… I also learned how to distinguish between fresh steam and flash vapor. I understood the parameters related to steam and condensate, as well as their value in terms of recycling; I learned about the principles behind removing iron from condensate, as well as the principles, applicable conditions, ranges, and maintenance methods of various drain valves. In 2019, I understood the concepts of steam temperature and pressure reduction, as well as how material properties are affected by temperature. Metal materials such as carbon steel are subject to the combined effects of temperature and pressure; as the operating temperature rises, factors like plastic creep cause the allowable stress of these materials to decrease significantly. In short, the higher the temperature, the softer the material, and its ability to withstand pressure decreases. When designing RTO systems in 2020, I took these issues into careful consideration, especially when checking heat-resistant flange pipes to ensure they would not suffer from plastic deformation at high temperatures. It was only in 2020, after coming into contact with 12CrMoVG material, that I truly understood the difference in allowable stress between boiler materials at normal temperatures and at high temperatures. In other words, attention has been paid to this issue for at least 10 years; it has been a problem that has persisted for a decade. Finally, an answer to it has been found. It is undeniable that the real competition in the industrial sector lies in the field of fundamentals. Materials and boilers are related to many aspects of industry, and they contribute significantly to the total industrial output. Any advancement in boiler technology is often revolutionary, and in the face of such revolutionary progress, all carbon reduction measures seem insignificant. It is true that the foundation of the Industrial Revolution was the use of boilers, and improvements in boiler technology represented huge advancements for industry. Therefore, true high technology is not made up of those fancy gadgets; all those fancy elements are merely superficial decorations used by capitalists to conceal their despicable actions of making huge profits through dishonest means. Therefore, true high technology always involves solving complex engineering problems that pose challenges to engineers and enabling their industrial application. Of course, there are cases in certain technical fields where people exaggerate the effects and impacts of such technologies without restraint; the main reason for this is that there isn’t a strong connection between the level of technical complexity and the consequences of failure. Boilers, on the other hand, are different – a failure can have serious repercussions, even threatening the safety of those responsible for maintaining the boiler as well as surrounding personnel, and it can also affect the safety of industrial processes and urban electricity supply that rely on that boiler. It can be said that all those involved must be extremely cautious, proceeding with great care and fear, stepping forward cautiously. During the first actual testing in production, the process of increasing pressure to the operating load is certainly a daunting task. Therefore, the real competition takes place at the fundamental level and in the basic areas, not in the superstructure.