Power plant

Abstract

A method for operating a power plant includes generating flue gas in a furnace of a fossil-fueled steam generator and generating steam for a steam turbine from heat contained in the flue gas. The steam is superheated prior to entry into the steam turbine and after partial expansion in the steam turbine. Feedwater is preheated exclusively outside the steam generator. The preheated feedwater is evaporated at high pressure. Nitrogen is removed from the hot flue gas directly following heat exchange of the flue gas with the partially expanded steam. A power plant includes a fossil-fueled steam generator having a combustion chamber wall being constructed as an evaporator heating surface, a number of tubes of the evaporator heating surface being gas-tightly joined together and having inlet ends, an inlet collector communicating with the inlet ends of the tubes, and an intermediate superheater. A deNO.sub.x device is disposed directly downstream of the intermediate superheater in flow direction of flue gas. A steam turbine is disposed down-stream of the steam generator. A feedwater preheater is disposed outside the steam generator. An inlet side of the feedwater preheater communicates with the steam turbine and a feedwater line directly connects an outlet side of the feedwater preheater with the inlet collector.