Method for operating a gas and steam turbine plant and gas and steam turbine plant operated according to the method

US5269130A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Hermann Finckh · Nuremberg, DE
• Hermann Bruckner · Uttenreuth, DE

Key dates

• Filing date: May 27, 1992
• Grant date: Dec 14, 1993
• Expiry date: May 27, 2012

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F01K23/108
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A gas and steam turbine plant has a gas turbine producing exhaust gas, a water-steam loop in which water is preheated at a given high pressure and subsequently evaporated, a steam turbine in the water-steam loop, and a steam generator through which the exhaust gas flows for generating steam for the steam turbine. The steam generator has at least one preheater connected to the water-steam loop and a high-pressure heater connected downstream of at least one preheater. The water-steam loop has a partial loop connected parallel to the at least one preheater outside the steam generator for carrying an adjustable throughput quantity. A heat exchanger is disposed in the steam generator in the vicinity of the at least one preheater for removing usable heat. A method for operating the plant includes preheating a partial quantity of the water to be preheated outside the steam generator at the given high pressure, and adjusting the partial quantity as a function of an available total water quantity and admixing the partial quantity with the water preheated in the steam generator.