Lean blowoff detection sensor

Power plants – Combustion products used as motive fluid – Process

Reexamination Certificate

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C060S039270, C060S039091

Reexamination Certificate

active

10865037

ABSTRACT:
Apparatus and method for detecting incipient lean blowoff conditions in a lean premixed combustion nozzle of a gas turbine. A sensor near the flame detects the concentration of hydrocarbon ions and/or electrons produced by combustion and the concentration monitored as a function of time are used to indicate incipient lean blowoff conditions.

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“In-Situ Flame Ionization Measurements in Lean Premixed Natural Gas Combustion Systems”, by Doug Straub, et al., Presented in Western States Section/Combustion Institute Spring Meeting, San Diego, CA, in 2002.
“Detecting Flashback in Premix Combustion Systems”, by Jimmy Thornton, et al., American Flame Research Committee (AFRC) International Symposium, Newport Beach, CA, USA, Sep. 2000.
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“Flame Ionization Sensor Integrated Into Gas Turbine Fuel Nozzle”, GT2003-38470, by Jimmy Thornton, et al., Proceedings of 2003 ASME/IGTI TurboExpo Meeting, TurboExpo Power For Land, Sea, and Air, Jun. 16-19, 2003, Atlanta, GA, pp. 1-8.

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