Patent ID: 7398651
Filing Date: 2008-07-15
Classification: F01K

Abstract:
1. A cascade power system comprising an energy extraction subsystem, a separation subsystem, a heat exchange subsystem, a heat transfer subsystem and a condensation subsystem, where the system is designed to establish two interacting working fluid cycles, one cycle utilizes a rich multi-component working fluid stream having a higher concentration of a low boiling component and the other cycle utilizes a lean working multi-component working fluid stream having a lower concentration of the low boiling component, where each stream is derived from a fully condensed incoming multi-component stream and a mixed stream having substantially the same composition as the fully condensed incoming multi-component stream designed to increase an amount of the circulating rich working fluid stream, where the separation subsystem designed to produce the lean and rich working fluid streams, where the heat exchange subsystem and the heat transfer subsystem are adapted to vaporize the lean working fluid stream and the rich working fluid stream from heat derived directly and/or indirectly from an external flue gas stream, where the energy extraction subsystem is adapted to extract energy from the lean working fluid stream in a separate lean working fluid stream turbine or turbine stages and the rich working fluid stream in a separate rich working fluid stream turbine or turbine stages, and where the condensation subsystem is adapted to condense a spent rich stream to form the fully condensed incoming multi-component stream.