US 11,053,849 B2
Anti icing method and apparatus
Lisa Batsch-Smith, Tijeras, MN (US); Stephen Bramham, Oviedo, FL (US); Scott Cloyd, Howey-in-the-Hills, FL (US); Beth Hays, Orlando, FL (US); and Angel Hernandez, Oviedo, FL (US)
Assigned to Mitsubishi Power Americas, Inc., Lake Mary, FL (US)
Filed by Mitsubishi Power Americas, Inc., Lake Mary, FL (US)
Filed on Aug. 23, 2019, as Appl. No. 16/549,061.
Prior Publication US 2021/0054786 A1, Feb. 25, 2021
Int. Cl. F02C 7/047 (2006.01); F02C 1/05 (2006.01); F02C 7/057 (2006.01); F02C 9/28 (2006.01); G05D 23/19 (2006.01)
CPC F02C 7/047 (2013.01) [F02C 1/05 (2013.01); F02C 7/057 (2013.01); F02C 9/28 (2013.01); G05D 23/1902 (2013.01)] 20 Claims
OG exemplary drawing
 
11. A gas turbine comprising:
a compressor;
an inlet duct in fluid communication with the compressor, the inlet duct configured to channel ambient air to the compressor;
a heat source disposed within the inlet duct upstream of the compressor;
an inlet duct temperature sensor and an inlet duct relative humidity sensor disposed within the inlet duct downstream of the heat source;
an inlet guide vane (IGV) assembly disposed downstream of the inlet duct temperature sensor and the inlet duct relative humidity sensor, the IGV assembly configured to control a mass of air flow into the compressor; and
a controller in signal communication with the inlet duct temperature sensor, the inlet duct relative humidity sensor, the IGV assembly, and the heat source, the controller configured to:
command the heat source to apply heat to the inlet duct and attain an initial temperature set point to produce conditions sufficient for preventing formation of ice within the inlet duct;
measure a position of the IGV assembly, an inlet duct temperature, and an inlet duct relative humidity to determine a thermodynamic state in the inlet duct;
evaluate the thermodynamic state to determine if the conditions are sufficient for preventing formation of ice within the inlet duct; and
in response to determining that sufficient conditions exist within the inlet duct for preventing formation of ice, adjusting the applied heat to maintain the measured inlet duct temperature.