METHOD AND DEVICE FOR CONTROLLING THE THERMAL EXCHANGE IN A HEAT RECOVERY STEAM GENERATOR OF A COMBINED CYCLE POWER PLANT AND COMBINED CYCLE POWER PLANT

摘要

Method for controlling the thermal exchange in a heat recovery steam generator (4) of a combined cycle power plant (1) comprising the steps of:- detecting at least one working parameter (QMPcur; Tcur) indicative of the current thermodynamic conditions in at least one first element (25, 40) of the steam generator (4) ;- calculating a thermal exchange error (et) as the difference between the detected working parameter (QMPcur; Tcur) and a respective predefined reference value (Qref; Tref);- assigning a pressure set point value (SPHP; SPMP) to a regulating member (19; 27) of the heat recovery steam generator (4) on the basis of the thermal exchange error (et) calculated;- regulating the regulating member (19; 27) on the basis of the pressure set point value (SPHP; SPMP) assigned.