The turbine can both drive a generator (merged cycle method) or just utilize the steam in process purposes (cogeneration or mixed heat and power (CHP)). HRSGs might have both an individual steam drum (as demonstrated in the animation beneath) or a number of steam drums and pressures. There's also both https://waste-heat-recovery91122.buyoutblog.com/31235674/new-step-by-step-map-for-hydrocarbon-heat-pumps