At 16:18 on October 13, Unit 3 of the Guoneng Fuzhou Phase II Project (2×660MW), an ultra-supercritical cogeneration unit independently developed by HTC, successfully completed its 168-hour trial operation. Throughout the test run, all systems of the unit operated stably with excellent parameters, laying a solid foundation for the commissioning of the dual units. This achievement marks another significant breakthrough in China's development and application of high-parameter, large-capacity cogeneration equipment, elevating the country's technical capabilities to a new level.

The project involves the custom-built development of two 660MW-class ultra-supercritical, single-shaft, four-cylinder, double-exhaust, ten-stage regenerative, extraction condensing steam turbines with single intermediate reheat. During the R&D process, Harbin Electric Turbine Company overcame multiple industry-wide technical challenges. The unit incorporates several cutting-edge technologies, including overload steam supplementation integrated with ultra-high pressure extraction steam, noise-reduced type reheat extraction control valves adapted for high-pressure differential operation, and high-efficiency wide-load-range low-pressure modules with long last-stage blades. These innovations represent China's first domestic application of such technologies, significantly enhancing the unit's adaptability and operational stability under complex working conditions.