Calculation of a 900 MW conceptual 700/720°C coal-fired power unit with an auxiliary extraction-backpressure turbine

Stępczyńska, Katarzyna; Kowalczyk, Łukasz; Dykasa, Sławomir; Elsnerb, Witold
December 2012
Journal of Power Technologies;Dec2012, Vol. 92 Issue 4, p266
Academic Journal
This paper presents the calculations for various configurations of a 900 MW power unit for advanced 700/720 °C ultra-supercritical steam parameters with a single and double steam reheat. The application of double steam reheat can improve power unit efficiency by 1.1%. The transition to such high steam parameters, especially the reheated steam temperature, involves thermodynamic and material problems related to high temperature differences in the feed water heaters. In relation to this, a concept is presented for the modification of the feed water heaters system by using an auxiliary extraction-backpressure turbine fed with steam from the cold reheat steam line. The steam from the bleeds and the turbine outlet is directed to feed water heaters, which in the classical system are fed from the intermediate pressure turbine. The efficiency improvement gained through use of an additional steam turbine is no higher than 0.2%. However, the greatest advantages of this solution are reduced temperature differences in the feed water heaters and a simplified structure of the IP part of the main turbine.


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