Steam power plant and steam generator, especially suited for a steam power plant of this type

Steam power plant, comprising:

• a steam turbine having a high-pressure part and a low-pressure part;
• a chargeable steam generator including a convection chamber, a waste gas discharge line, a single fluidized bed combustion chamber, a high-pressure heater, and an intermediate superheater having an inlet connected to said high-pressure part of said steam turbine, an outlet connected to said low-pressure part of said steam turbine, and a heating surface, said intermediate superheater being disposed in said convection chamber for influencing steam temperature at said outlet of said intermediate superheater;
• a gas turbine connected in said waste gas discharge line downstream of said steam generator;
• an air compressor connected to and driven by said gas turbine;
• a combustion air supply line connected from said air compressor to said combustion chamber, said air supply line having a nozzle discharging into said convection chamber between said combustion chamber and said heating surface of said intermediate superheater, and said air supply line having an air valve for controlling air fed to said nozzle;
• a regulator operatively connected to said air valve for controlling said air valve, a sensor being operatively connected to said regulator and disposed in vicinity of said outlet of said intermediate superheater for sensing the actual temperature of steam leaving said outlet, and a signal transmitter operatively connected to said regulator for giving said regulator a nominal value for the temperature of steam leaving said outlet, said regulator controlling said air valve causing the actual temperature to approach the nominal temperature at said outlet;
• and a bypass line connected from said air supply line to said waste gas discharge line, said bypass line having another air control valve connected therein.