Patent ID: 7980079

Claim:
A system for high or medium initial temperature heat sources in medium and small scale power plants comprising: a turbine subsystem including at least one turbine adapted to convert a portion of thermal energy contained in at least one vaporized, superheated stream to form a spent stream, a heat recovery vapor generator (HRVG) adapted to fully vaporize and superheat at least one heated stream to form the at least one vaporized, superheated stream using heat from an external heat source stream, a first heat exchange apparatus adapted to heat a partially heated rich working fluid stream and a preheated first lean working fluid substream with heat from the spent stream to form a heated rich working fluid stream and a heated lean working fluid stream and a cooled spent stream, a first combining valve adapted to combine the cooled spent stream with a higher pressure second lean working fluid stream to form a leaner spent stream, a second heat exchange apparatus adapted to heat a preheated rich working fluid stream and a high pressure first lean working fluid substream with heat from the leaner spent stream to form the partially heated rich working fluid stream and the preheated first lean working fluid substream and a partially condensed leaner spent stream, a separator adapted to separate the partially condensed leaner spent stream into a vapor stream and a lean liquid working fluid stream, a first dividing valve adapted to divide the lean liquid working fluid stream into a first lean liquid working fluid substream, a second lean liquid working fluid substream, and a third lean liquid working fluid substream, a first pump (P 2 ) adapted to raise a pressure of the first lean liquid working fluid substream to a high pressure to form the high pressure first lean working fluid stream, a second pump (P 3 ) adapted to raise a pressure of the second lean liquid working fluid substream to a higher pressure to form the higher pressure second lean working fluid stream, a second combining valve adapted to combine the vapor stream and the third lean liquid working fluid substream to form a basic working fluid stream, a third heat exchange apparatus to heat an intermediate pressure basic working fluid stream to form the preheated basic working fluid stream and a cooled basic working fluid stream, a fourth heat exchange apparatus adapted to condense the cooled basic working fluid stream with an external coolant stream to form a fully condensed basic working fluid stream, and a third pump (P 1 ) adapted to raise a pressure of the fully condensed basic working fluid stream to form the intermediate pressure basic working fluid stream.