The turbine can either travel a generator (mixed cycle technique) or simply just make use of the steam in approach purposes (cogeneration or put together heat and electricity (CHP)). HRSGs can have either only one steam drum (as revealed in the animation down below) or various steam drums and pressures. https://hydrocarbon-heat-pumps25677.sharebyblog.com/30855847/not-known-details-about-hydrocarbon-heat-pumps