提高燃煤发电机组效率是实现节能降碳的直接手段，700℃超超临界发电的工程应用受制于高温合金材料价格成本阻碍，有必要探索新布置、新结构、缩短高温蒸汽管道以降低工程造价。本文以锦界电厂三期为例，介绍了超超临界空冷汽轮发电机组高位布置技术取得的工程化创新实践。该工程实践表明，锦界电厂三期作为世界首例高位布置示范工程，主厂房采用钢筋混凝土框架-剪力墙结构，可有效降低整体重心、提高抗震性能，通过技术攻关有效保障主厂房结构、高温蒸汽管道和汽轮发电机组的安全性；与常规布置（运转层12.6~17 m标高）相比，高位布置（运转层65 m标高）主蒸汽、再热蒸汽管道分别可节省材料约34.2%、20.9%，空冷岛排汽管道可节省的材料达93%，还可以较设计值节省供电煤耗4.5~5.1 g/(kW·h)，整体技术经济性显著提高；此外，项目投产后的运行监测数据显示，主厂房结构实时在线监测系统各参数均在安全阈值范围内，厂房结构、关键设备均处于安全状态。研究建议，加快发展清洁高效燃煤发电技术，统筹协调我国富煤缺水“三北”地区清洁高效先进空冷煤电机组应用高位布置技术，为未来700℃超超临界煤电机组建设节约高温蒸汽管道提供实践经验。

Improving the power generation efficiency of coal-fired units is an effective measure to achieve energy conservation and carbon reduction. The engineering application of 700 ℃ ultra-supercritical coal-fired power generation is hindered by the high price of superalloy materials; therefore, it is necessary to explore new layouts and structures to shorten the high-temperature steam pipelines and reduce the engineering costs. By taking the phase III expansion project—the world's first demonstration project of high-level layout—of the Jinjie coal-fired power plant as an example, this study introduces the engineering innovation practice of the high-level layout technology for an air-cooled ultra-supercritical steam-turbine generator unit. The results indicate that the reinforced concrete frame and shear wall structure can effectively lower the overall center of gravity and improve the seismic performance of the main power house, thereby ensuring the safety of the main power house structure, high-temperature steam pipelines, and steam turbine generator unit through technological breakthroughs. Compared with those of the conventional layout (its operating floor level being 12.6‒17 m), the main steam and reheat steam pipelines of the high-level layout (its operating floor level being 65 m) can save 34.2% and 20.9% of raw materials, respectively; and exhaust steam pipes of the air-cooled island can save 93% of raw materials. Furthermore, the power supply coal consumption can be reduced by 4.5‒5.1 g/(kW·h) compared with the design value, and the overall economical efficiency is significantly improved. The monitoring data after operation show that all parameters in the real-time on-line monitoring system of the main power house structure are within the safety threshold, and the plant structure and critical equipment are both in a safe state. Therefore, we propose to promote clean and efficient coal-fired power generation technologies and apply the high-level layout technology to the advanced air-cooled coal-fired power units in northeast, north, and northwest China as these regions are rich in coal but short of water. This can provide practical experience for the construction of economical high-temperature steam pipelines for 700 ℃ ultra-supercritical coal-fired power units.