Abstract
ABSTRACT The present work aims at the comparative assessment of specific fuel consumption () and carbon dioxide () emissions of combined power cycle plant () with and without gas turbine blade cooling. The open loop air film cooling has been employed to cool the turbine blades. In this work, the irreversibility of components of is estimated. The effect of gas turbine inlet temperature (GTIT) and compressor pressure ratio (CPR) on exergy efficiency and mass flow rate of the coolant are evaluated. The coolant flow requirement was 0.03579 kg/kg of gas. The exergy efficiency was decreased by 0.3%, SFC and emissions were increased by 0.4% and 0.3% respectively (GTIT = 1473 K, CPR = 12) for cooled gas turbine based when compared with un-cooled one. Since the increment in and emissions were marginal, it is recommended to use open loop air film cooling for to ensure a longer life of blades.
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