Comparison of Single- and Twin-Shaft CCPPS
The main advantages and disadvantages of single- and twin-shaft CCPPs are analyzed, taking into account various configurations and thermal efficiency and controllability. Single-shaft configurations with and without freewheeling clutch between the electric generator and the steam turbine are considered. Single-shaft 370 – 420 MW CCPPs operated in Russia are compared with twin-shaft units of the same capacity.
Keywordscombined-cycle power plant (CCPP) single-shaft steam turbine heat-recovery steam generator (HRSG) gas turbine configuration freewheeling clutch axial exhaust
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