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1. (WO2005124125) METHOD FOR OPERATING A GAS TURBINE COMPRESSOR WHILE COOLING THE COMPRESSOR INTAKE AIR BY EVAPORATION

Pub. No.:    WO/2005/124125    International Application No.:    PCT/EP2005/052709
Publication Date: Fri Dec 30 00:59:59 CET 2005 International Filing Date: Tue Jun 14 01:59:59 CEST 2005
IPC: F02C 7/143
Applicants: ALSTOM Technology Ltd
CATALDI, Giovanni
FAEHNDRICH, Christian
MATZ, Charles, Raymond
Inventors: CATALDI, Giovanni
FAEHNDRICH, Christian
MATZ, Charles, Raymond
Title: METHOD FOR OPERATING A GAS TURBINE COMPRESSOR WHILE COOLING THE COMPRESSOR INTAKE AIR BY EVAPORATION
Abstract:
The invention relates to a method for operating a gas turbine compressor, in which compressor air that is suctioned from the environment is cooled by evaporation before entering the compressor. According to said method, maximum drops in temperature that can be obtained by evaporation cooling are determined and/or are made available as a set of data before the compressor is started, the drops in temperature are correlated with a characteristic diagram of the compressor, from which maximum temperature variations that must be maintained at different ambient conditions and at different rotational speeds of the compressor to prevent pumping can be gathered, and evaporation cooling is performed only when momentary ambient conditions result in a maximum possible drop in temperature of which a predefined fraction lying between 50 and 100 percent does not exceed the maximum temperature variation gathered from the characteristic diagram for said ambient conditions and a momentary rotational speed of the compressor. The disclosed method allows a compressor to be operated safely without monitoring the temperature variations in the suctioned air flow.