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1. (WO2014193617) SYSTEM AND METHOD FOR CONTROLLING ICE FORMATION ON GAS TURBINE INLET GUIDE VANES

Pub. No.:    WO/2014/193617    International Application No.:    PCT/US2014/037094
Publication Date: Fri Dec 05 00:59:59 CET 2014 International Filing Date: Thu May 08 01:59:59 CEST 2014
IPC: F01D 25/02
F01D 21/00
F02C 7/047
Applicants: SIEMENS ENERGY, INC.
Inventors: HATCHER, Clifford, Jr.
RUHGE, Forrest, R.
Title: SYSTEM AND METHOD FOR CONTROLLING ICE FORMATION ON GAS TURBINE INLET GUIDE VANES
Abstract:
Gas turbine inlet guide vane ice detection and control systems and methods that utilize active infra red monitoring of inlet guide vanes, detection of ice formation on the guide vanes and elimination of the ice by altering properties of the gas turbine inlet intake airflow, such as by introducing compressed and/or heated air bled from the turbine. Ice has lower detectable emissivity intensity in the infra red spectrum than ice free inlet guide vane surfaces. Ice formation is inhibited by direct monitoring of inlet guide vane icing conditions, rather than by indirect empirical assumptions of ice formation based on atmospheric condition monitoring. Direct monitoring mitigates ice formation in real time without reliance on excessive use of gas turbine compressed or heated air bleed, which enhances turbine operational efficiency.