Patent ID: 6269626
Filing Date: 2001-08-07
Classification: F01K,F02C,F05D,Y02E,Y02P

Abstract:
A combined cycle cogeneration power plant comprising:a source of combustion fuel;a combustion turbine including:a fuel inlet for receiving combustion fuel,an air inlet for receiving air,a combustor for burning said combustion fuel and said air, andan outlet through which hot gaseous combustion product can be released;a heat recovery steam generator (HRSG) connected to said outlet of said combustion turbine for receiving said hot gaseous combustion product, said HRSG including:a plurality of heat exchangers each including a steam/water drum having at least one surface blowdown connection, a plurality of evaporators connected to respective steam/water drums, and a plurality of economizers each connected to a respective steam/water drum,a water inlet connected with at least one of the economizers of the HRSG,a steam outlet, anda stack for releasing said hot gaseous combustion product;a regenerative fuel heating system (RFHS) coupled to said source of combustion fuel, and including:a plurality of heat exchangers for transferring heat to said combustion fuel for heating said combustion fuel prior to receipt of said combustion fuel at said fuel inlet,each heat exchanger of said RFHS being coupled to a blowdown connection of a respective steam/water drum of said HRSG, anda plurality of modulating control valves, each control valve being connected downstream of a respective heat exchanger of said RFHS to thereby control flow conditions in the respective heat exchanger of said RFHS to thereby control temperature of said combustion fuel;a steam turbine having a steam inlet for receiving steam from the steam outlet of the HRSG, and an exhaust steam outlet from the said steam turbine;a condenser connected to said exhaust steam outlet of said steam turbine for condensing steam to a liquid condensate; andat least one pump for supplying water to said HRSG.