Evaluation of Heat Recovery Steam Generator for Gas/Steam Combined Cycle Power Plants

The combined cycle power plant consists of topping cycle, bottoming cycles and heat recovery steam generators (HRSGs) as the integral systems. The main focus of this work is to predict and analyse fluid flow behaviour in HRSG. The heat transfer and pressure drop analysis are performed by using computational fluid dynamics (CFD) model. The CFD model capability for predicting heat transfer and pressure drop performance of finned tube in cross-flow is analysed. The HRSGs having serrated tube and steady-state approach, with a two-equation turbulence model, is employed to examine fluid flow having Reynolds numbers variation from 5000 to 30,000. The external flow Nusselt number and overall pressure drop predicted by the CFD model are compared with those predicted by published empirical correlations.