Annual performance improvement for solar steam turbines through the use of temperature-maintaining modifications
2012 (English)In: Solar Energy, ISSN 0038-092X, Vol. 86, no 1, 496-504 p.Article in journal (Refereed) Published
Steam turbines in solar thermal power plants experience a much greater number of starts than those operating in base-load plants. By maintaining higher internal temperature during idle periods, faster start-up times can be achieved, increasing the flexibility of the plant as well as increasing net electrical production. Prior work by the authors identified a number of methods for achieving this, with strong increases in daily production predicted; only two specific start-up cases were studied however. In order to obtain a more representative evaluation of the performance increase that can be achieved through increased dispatchability of the turbine, the annual improvement needs to be studied. Building on the existing results, a dynamic system model of a parabolic trough power plant has been established and used to determine the distribution of different cool-down times experienced throughout the year, with a view to evaluating the potential annual production increase. A modification of the start-up curves allows an increase in annual electrical production between 6.4% and 2.4% depending upon the operating mode (free operation versus day-time operation). Through application of a combination of heat blankets and an increase in gland steam temperature, further annual production increases between 2.2% and 3.1% are predicted.
Place, publisher, year, edition, pages
2012. Vol. 86, no 1, 496-504 p.
Solar thermal power, Steam turbine, Dispatchability, Start-up
IdentifiersURN: urn:nbn:se:kth:diva-35273DOI: 10.1016/j.solener.2011.10.023ISI: 000300459600052ScopusID: 2-s2.0-84855188629OAI: oai:DiVA.org:kth-35273DiVA: diva2:426494
QC 201204172011-06-282011-06-232012-06-11Bibliographically approved