World’s First 630℃ Ultra-Supercritical Double Reheat Power Unit in Yuncheng Successfully Grid-Connected

On April 29, the world’s first No.1 unit of Datang Yuncheng 630℃ ultra-supercritical double reheat national power demonstration project achieved successful grid connection in one attempt, officially delivering the "first kilowatt-hour of electricity" to the power grid. This milestone signifies that the unit has obtained the capability of external power supply, laying a solid foundation for the subsequent 168-hour full-load trial operation and official commissioning.

As a benchmark demonstration project for national power development, the Datang Yuncheng project stands out as the world’s first 630℃ ultra-supercritical double reheat power unit. People’s Network reported that it takes "reheat steam temperature at the turbine inlet reaching 630℃ and unit power generation thermal efficiency exceeding 50%" as its core demonstration points, representing the world’s leading parameters in terms of design pressure, temperature, power generation efficiency and coal consumption.

The project adopts a series of key technologies independently developed in China, including domestically researched and produced martensitic heat-resistant steel G115 and austenitic steel C5, a generator double-heat recovery system with power balance, and in-depth utilization of flue gas waste heat. These technological applications have completely ended China’s long-term passive dependence on imports for high-temperature and high-pressure component materials.

China News Service pointed out that ultra-supercritical power generation technology is a key approach to the clean and efficient utilization of coal resources, which is in line with China’s energy endowment characterized by "abundant coal, insufficient oil and scarce gas". The Datang Yuncheng project has not only promoted the formation of a complete independent industrial system from material R&D and equipment manufacturing to engineering application, but also achieved dual breakthroughs in independent control of core technologies and iterative upgrading of equipment manufacturing.

This breakthrough has laid a solid engineering practice foundation for the R&D and application of higher-grade ultra-supercritical power generation technology in the future, further consolidating China’s leading position in the global ultra-supercritical power generation field. At present, China has continuously deployed and researched 10-megawatt ultra-supercritical high-efficiency power generation technology for 15 consecutive years, with the minimum power supply coal consumption reaching 264 grams per kilowatt-hour, which is at the global advanced level.

Looking ahead, the official commissioning of the Datang Yuncheng project will bring significant economic and environmental benefits. Compared with conventional 1-million-kilowatt units, the project is expected to save 208,000 tons of standard coal and reduce carbon dioxide emissions by 540,000 tons annually after commissioning. This not only achieves in-depth integration of efficient power generation and clean environmental protection, but also provides strong support and demonstration for China’s energy structure transformation and the achievement of the "dual carbon" goals.

With the continuous advancement of the project, it will further promote the upgrading of China’s power industry, help firmly hold the energy bowl in its own hands, and inject strong impetus into the high-quality development of the national energy sector.