Steam Turbine Retrofits Technology for Improved Performance and Reliability
Improved efficiency has been one of the most significant aspects of the development and application of steam turbines, along with the improvement of reliability and gains in terms of both reduced maintenance and extended operation. There is now extra emphasis on evolving increased efficiency, due to the pressure to reduce carbon dioxide emissions with environmental problems in mind. Therefore, several approaches have been made to upgrade the internal turbine efficiency with the advanced steam path stage, by reducing the exhaust loss with long last stage blades, by improving the steam turbine cycle efficiency such as in terms of ultra super-critical pressure and double reheat cycle and by applying an advanced combined cycle with high firing temperature gas turbines. On the other hand, many of the existing steam turbines, which were designed and manufactured based on the former conventional production technologies remain in operation and the majority of such units have been utilized for more than twenty years, some for more than thirty. Furthermore, in some aging existing steam turbines, there is evidence of decreased performance, efficiency and availability due to age-related deterioration of the turbine parts and components, particularly on the steam paths. Under these circumstances, upgrading to extend the lifespan, performance and reliability of steam turbines, particularly existing units, is vital to keep them operating for many years. This paper describes the advanced technologies adopted in the recent retrofits, including advanced steam path design, the new last stage blade technology and a re-powering system with added gas turbine, etc. which help achieve improved efficiency and reliability for aging existing steam turbines. The retrofit cases of up-rating and life extension have been introduced to illustrate how these technologies have been applied and the relevant gains, based on our experience.
Power generation Steam turbine
A.Sakuma T.Matsuura H.Kodama
Toshiba Corporation, Japan
国际会议
2007杭州国际动力工程会议(The International Conference on Power Engineering 2007)
杭州
英文
2007-10-23（万方平台首次上网日期，不代表论文的发表时间）