In this paper, a modification of a simple gas turbine into the Brayton cycle with regenerative heating, using turbine extraction at intermediate pressure, is presented. The main concept of the retrofitting is based on the transfer of heat from the turbine exhaust gases to the air entering the combustion chamber. The extracted gas transfers heat to air via the divided regenerative heat exchanger and after that is compressed and mixed with additional air. The efficiency gain is dependent on the extraction intermediate pressure and the extraction mass flow rate. The mathematical model of the proposed cycle and its implementation in an in-house code termed COM-GAS is presented. This zero-dimensional robust model allows the prediction of basic parameters such as temperatures, combustion composition, efficiency, and other related factors. Numerical simulations of both basic models with either semi-perfect or real gases based on thermodynamic tables were compared with available exploited data, and differences between this study and others did not exceed 5%. Contrarily, differences between gas turbine cycle with regenerative heating are visible between the two models. In particular, when using the coupled classical regeneration with regeneration according to Szewalski's idea, the integrated cycle efficiency could be significantly increased up to 39.5%.
Autorzy
Informacje dodatkowe
- DOI
- Cyfrowy identyfikator dokumentu elektronicznego link otwiera się w nowej karcie 10.1016/j.energy.2019.06.160
- Kategoria
- Publikacja w czasopiśmie
- Typ
- artykuł w czasopiśmie wyróżnionym w JCR
- Język
- angielski
- Rok wydania
- 2019
