ABSTRACT
The heat recovery steam generator (HRSG) is the vital connection between the topping Brayton cycle (gas turbine) and the bottoming Rankine cycle (steam turbine). It serves as the “heat sink” for the former and as the “heat source” for the latter. This chapter provides a detailed look into basic HRSG types (e.g., vertical or horizontal, drum-type or once-through), hardware specification and thermodynamic performance analysis. Basic principles of waste heat recovery and its impact on steam cycle design, e.g., steam temperature and pressure, number of pressure levels, reheat or not are explained in great detail. The chapter includes detailed coverage of supplementary (duct) firing for power augmentation and feasibility of supercritical steam cycle in gas turbine combined cycle applications.
