Power plants – Combustion products used as motive fluid – Combustion products generator
Patent
1996-05-02
2000-04-11
Thorpe, Timothy S.
Power plants
Combustion products used as motive fluid
Combustion products generator
60747, 60749, 60733, F02C 100
Patent
active
060475501
ABSTRACT:
Lean premixed combustion of a hydrocarbon fuel and air is combined with lean direct injection of hydrocarbon fuel and air into a combustor downstream of the premixed reaction zone in order to achieve extremely low levels of emissions of oxides of nitrogen at the high combustor exit temperatures required by advanced heavy duty industrial gas turbines. One or more premixing fuel nozzles are used to supply a lean mixture of hydrocarbon fuel and air to the main or primary reaction zone of a gas turbine combustor. This lean fuel/air mixture has an adiabatic flame temperature below the temperature that would result in substantial thermal NOx formation. After this low temperature reaction has been completed, additional fuel and air are injected into the products of combustion downstream of the main reaction zone in order to raise the temperature of the mixture to the level required to operate an advanced, high efficiency, heavy duty industrial gas turbine at high load. Formation of nitrogen oxides in the region after this secondary fuel and air injection is minimized by partial premixing of fuel and air prior to ignition and by minimizing the residence time between the secondary fuel injection and the turbine first stage inlet.
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Lean Primary Zones: Pressure Loss and Residence Time Influences on Combustion Performance and NOx Emissions, M.M. Abdul Aziz et al., Department of Fuel and Energy, University of Leeds, Leeds, United Kingdom, 1987 Tokyo International Gas Turbine Congress, pp. 89-96.
General Electric Co.
Thorpe Timothy S.
Tyler Cheryl J.
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