General Electric Technology Gmbh

General Electric Company

Joerg Dietzmann

Richard Carroni

Christoph Bernhard Ruchti

Hongtao Li

Paul Drouvot

Mariah Couzzi-Carneiro

François Droux

Mariah Couzzicarneiro

Christoph Ruchti

Torbjoern Stenstroem

A method for operating a combined cycle power plant includes transferring exhaust gas from a gas turbine to a heat recovery steam generator. Further, the method includes preheating condensate before being fed as feedwater to the heat recovery steam generator. Moreover, the method includes reheating the feedwater in the heat recovery steam generator. The method also includes generating steam in the heat recovery steam generator for a steam turbine, wherein preheating the condensate includes monitoring a temperature of the condensate: if the temperature of the condensate is equal to or above a preset temperature, directing the condensate to a low-pressure economizer of the heat recovery steam generator; if the temperature of the condensate is lower than the preset temperature: directing a first fluid from an intermediate source of the low-pressure economizer to heat the condensate.

Method for operating a combined cycle power plant and corresponding combined cycle power plant

A water/steam system for a combined cycle power plant and related method for operating said system are provided. The system comprises a heat recovery steam generator providing a flue gas stream path for extracting heat from a flue gas stream exhausted from a gas turbine, the heat recovery steam generator having a low pressure section including a low pressure evaporator arranged along the flue gas stream path for generating low pressure steam at a low pressure input level for a main input of a low pressure steam turbine. To use heat at low temperatures, the low pressure section may include a sub low pressure subsection with a sub low pressure evaporator for generating sub low pressure steam, at a sub low pressure level below the low pressure input level. The sub low pressure evaporator is disposed in the flue gas stream path downstream of a low pressure economizer.

Combined cycle power plant and method for operating such a combined cycle power plant

A power plant () that includes at least one of a gas turbine (GT), a steam turbine (ST) with a water-steam cycle, and a heat recovery steam generator (B) operatively connected to a heat generating member such as solar energy system (S) by means of a primary circuit () and a secondary circuit system (). The primary heat transfer circuit () includes solar heating system (S) configured to heat a primary fluid (), and the secondary circuit () comprises a flow line (A) for a secondary flow () and a main heat exchanger () to exchange heat between the secondary water flow and a gas turbine inlet air flow (). A first line (B) in the primary circuit () leads to a first heat exchanger () to heat the water flow in the secondary circuit ().

Power plant with solar energy system

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Baden, Switzerland

Joerg Dietzmann