Process heat recovery particularly for combined cycle apparatus for carrying the method Óoeuvre and heat recovery plant for combined cycle.

This invention relates to a heat recovery method in particular for combined cycle gas turbine / steam turbine using the output of a gas turbine a waste heat boiler in which water is first treated in a degassing (5) connected to a first evaporator and comprising a number of heat exchange devices. In this furnace is then used a ultrasupercritical steam cycle with four pressure levels (P1, P2, P3, P4) with intermediate stages of vaporizing subcritical fluids.