【Ten Years of Rapid Development in Chemical Engineering Equipment】2892–2025: The world’s first 630°C secondary reheating thermal power project – The bypass system for the 2×1000MW ultra-supercritical secondary reheating steam turbines at Datang Yuncheng was put into operation in 289

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Let’s give praise and encouragement to the achievements made in China’s chemical engineering technology and equipment; your participation in discussions is the greatest encouragement. **********************【Ten Years of Great Development in Chemical Engineering Equipment】A continuously updated summary post is available – feel free to join the discussions: https://bbs.hcbbs.com/thread-3576046-1-1.html ***************** Recently, the world’s first 630°C secondary reheating steam turbine bypass device, developed and manufactured by Harbin Electric Valves for the Datang Yuncheng 2×1000MW ultra-supercritical secondary reheating power demonstration project, successfully passed the joint inspection and evaluation by an expert panel composed of Datang Shandong Power Generation Co., Ltd., Hefei General Machinery Research Institute Co., Ltd., China Iron and Steel Research Institute Co., Ltd., Datang North China Testing and Research Institute, and Datang Group Science and Technology Research Institute. https://www.cgmia.org.cn/FileUpLoad/jsFile/639008670797521306_1.png The Datang Yuncheng project is the **only coal-fired power demonstration project of 1 million kilowatts that was approved during the 13th Five-Year Plan period**. It features the world’s highest pressure, temperature, efficiency, and lowest coal consumption among single-axis 1-million-kilowatt thermal power units; it is also a major project for the transformation of old and new economic drivers in Shandong Province. The super-supercritical turbine bypass system is one of the key equipment in power plants; especially when dealing with the requirement for frequent load regulation in **new coal-fired power plants, its performance directly affects the operational efficiency of such plants. The project features as a demonstration highlight a reheat steam temperature of 630°C, a main steam pressure of 35.5 MPa, a coal consumption for power generation of 256.28 grams/kWh, and a thermal efficiency in power generation exceeding 50%. It is also a **key demonstration site for independent research and development of a new type of martensitic heat-resistant steel, G115, as part of major specialized projects. Currently, there are no mature welding techniques available in the industry that can be used as a reference for this purpose. Critical components such as the valve bodies and seat of bypass valves are prone to issues such as cold cracks and softening in the heat-affected zone during welding, which constitute bottlenecks that hinder the timely completion of the project. The HHarbin Electric Valve R&D team adopted a \"24/7 continuous operation\" work schedule, upholding the selfless \"Harbin Electric spirit\" and the pursuit of excellence represented by the \"craftsman spirit.\" After 40 days of relentless effort, they successfully overcame the challenges associated with the critical welding process. Harbin Electric Valves has successfully overcome the industry’s barriers related to the welding processes and manufacturing of G115 material. It has mastered key technologies such as large-area wear-resistant cladding using cobalt-based cemented carbide for G115 material, butt welding of G115 material, and butt welding of G115 material with F92 material. All welding materials used are domestically produced, resulting in a 100% domestic content rate. This achievement has enabled a full-chain advancement of high-end heat-resistant steel from ‘material research and development’ to ‘engineering application’ in the field of supercritical (ultra-supercritical) thermal power generation. It has laid a solid foundation for the company’s development and application of new HT700 high- and low-pressure bypass valves for the 650°C supercritical (ultra-supercritical) thermal power units in the Huaneng Yuhuan project. The successful passage of this joint appraisal and acceptance marks the first time in the world that the newly developed domestic G115 maraging heat-resistant steel has been applied in power equipment. This achievement fills a technical gap in the field of high-temperature resistant material development, indicates that Harbin Electric’s valve welding technology has entered an unexplored area, and also shows that Harbin Electric’s valve products have broken the monopoly of imported brands in the domestic market for ultra-supercritical thermal power bypass systems. It has reversed the long-standing reliance on imported valves, significantly enhancing the overall competitiveness of domestic valve manufacturers. This progress helps China’s thermal power equipment reach new levels in terms of design, manufacturing, new materials, and new processes, thereby filling a gap in the world.