超(超)临界空冷机组技术与经济性研究

Technical and Economic Analysis of (Ultra) Supercritical Air-cooling Power Units

阐述了超（超）临界空冷发电机组的参数选型和技术方案、空冷汽轮机的关键技术参数,并以2台600 MW超临界空冷电站作为研究对象,根据《2009中国电力行业年度发展报告》提供的有关数据,对超临界空冷电站的发电成本及其敏感因素进行分析测算.结果表明：目前国内已经具备了设计制造600~1 000 MW级超（超）临界机组的能力,在国内已有的先进、成熟技术基础上,通过重点开展关键部件和技术的研究和开发,有条件形成具有自主知识产权的超（超）临界空冷机组成套设计制造技术;在一定的比投资下,上网电价随煤价的上升而提高;在一定煤价下,比投资提高,上网电价也将提高;空冷电站的年平均热效率与电厂运行方式和空冷机组的热效率密切有关,提高年平均热效率是降低发电成本、提高运行经济性的关键之一;在空冷机组的选型上,应选用高效率的超（超）临界机组,并使机组在高负荷状态下运行.

An introduction is being presented to parameter selection and technical schemes of（ultra） supercritical air-cooling power units as well as to key technical parameters of relevant steam turbines.Taking 2 600 MW supercritical air-cooling power units as an example,and based on the data from ＂2009 Annual Development Report of China＇s Electric Power Industry＂,relevant electricity generation cost and influencing factors have been analyzed.Results show that according to current design and manufacture capability,China＇s electric power industry is able to design and manufacture 600-1 000 MW class（ultra） supercritical power units,and therefore may possess our own intellectual property through research and development of key components and technologies based on existing advanced and proven technologies.For a fixed specific investment cost（SIC）,on-grid power price increases with rising coal price;whereas for a fixed coal price,on-grid power price increases with rising SIC;the annual average thermal efficiency of an air-cooling power plant has a close relationship with operation mode of the power plant and thermal efficiency of the air-cooling unit.To improve the operational economy of power plant,it is necessary to raise its annual average thermal efficiency.For type selection of air-cooling units,（ultra） supercritical models are recommended,which are to be operated under high load conditions.