A gas stream with a reduced oxygen concentration relative to ambient air is used to vaporize a liquid fuel or liquefied higher hydrocarbon gas, or is mixed with a vaporized gas, and the reduced oxygen vaporized fuel gas is fed to a combustion device such as a premixed or diffusion combustor. Preferably, the oxygen content of the gas stream is less than the limiting oxygen index. By mixing the fuel with a gas stream that has an appropriately reduced oxygen content, auto-ignition prior to the desired flame location in the combustor can be avoided. In some embodiments, the reduced oxygen stream is generated from an air separator or taken from the exhaust of the combustion device.

System for vaporization of liquid fuels for combustion and method of use

A nozzle configuration and control methodology adapted to provide a compact means for configuring and operating an industrial gas turbine on either gaseous or liquid fuel while utilizing fuel staging to achieve very low emissions. More specifically, the outer fuel nozzles are used for delivery of a portion of the premix gaseous fuel and all liquid fuel, but not diffusion gaseous fuel. Water injection for emissions control on liquid fuel and atomizing air for the liquid fuel are also supplied entirely by the outer fuel nozzles. The central fuel nozzle is thus used for the supply of both premix gaseous fuel and all diffusion gaseous fuel. The disclosed configuration reduces the number of required fluid passages thus simplifying the endcover structure while enabling fuel staging to achieve very low emissions on gaseous fuel.

Fuel system configuration and method for staging fuel for gas turbines utilizing both gaseous and liquid fuels

A water-injection control system is disclosed for a water supersaturation system installed in a gas turbine air intake system for augmenting gas turbine power output during operation at high ambient-air temperature, while maintaining the water content in the intake air within limits acceptable to the gas turbine as indicated by measured gas turbine operating parameters. The control system starts, stops, modulates, and limits water supplied to the supersaturating system based on the humidity or dew-point temperature of the ambient air, dry-bulb temperature of the ambient air, compressor inlet air flow, and gas turbine parameters indicating operation at or near maximum output.

Control system and method for gas turbine inlet-air water-saturation and supersaturation system

A liquid fuel purge system is disclosed for flushing liquid fuel from the combustion chambers of a gas turbine. The liquid purge system includes a three-way valve to pass liquid fuel and, alternatively, purge air to the combustion chambers. The gas turbine may operate on liquid fuel or gaseous fuel. When the turbine is switched to burn gaseous fuel, the liquid fuel remaining in the liquid fuel system is flushed by purge air provided by a liquid fuel purge system.

Liquid fuel and water injection purge systems and method for a gas turbine having a three-way purge valve

Compressor discharge air flows through a heat exchanger in heat exchange relation with cooling water and is supplied at reduced temperature in atomizing air and purge modes to combustors in a dual-fuel gas turbine. The heat exchanger has a pair of bypass passages in parallel with a temperature regulating valve controlling flow of water through the heat exchanger in response to the temperature of the compressor discharge air exiting the heat exchanger. Should the flow control valve close in response to low temperature of the compressor discharge air, in the air atomizing mode, the bypass passages with orifices therein provide a minimum protective flow of cooling water to the heat exchanger. In the purge mode where only half the air flow and heat rejection is required in the heat exchanger and the flow control valve closes, a bypass valve in one of the bypass passages closes to enable reduced flow of cooling water through the heat exchanger.

Dual orifice bypass system for dual-fuel gas turbine

A purge system is disclosed for flushing liquid fuel and water from the combustion section of a gas turbine system as well as for providing continuous cooling of the nozzles. The gas turbine may operate on liquid fuel or gaseous fuel. When the turbine is switched to burn gaseous fuel, the liquid fuel remaining in the liquid fuel system is flushed by a liquid fuel purge system. Similarly, water in the water injection system is purged from nozzles in the combustion system by a water purge system. The purge system operates in conjunction with an air atomization system, but does not rely on an atomizing air compressor to boost the pressure of the purge air. Instead, the purge system utilizes pressurized air from the gas turbine compressor and directs the purge air to manifolds which distribute air to the atomizing air passages, liquid fuel nozzles, and water injection nozzles via purge valves and soft purge valves.

Liquid fuel and water injection purge systems for a gas turbine

PROBLEM TO BE SOLVED: To dispense with a purge compressor by using low pressure air from a main compressor discharge port when a gas turbine is operated by gas fuel. SOLUTION: This purge system receives cooled and filtered air from a compressor discharge port 202 through an atomizing air pre-cooler 164 and a water separator 166. An atomizing air compressor bypass, line 210 supplies compressor discharge air to the purge system. The bypass line 210 enables manual control for the pressure and flow of the compressor discharge air supplied to the purge system as purge air. It is desirable to include a manual-operated regulating valve 212 and a limit orifice 211. The purge system does not require a boosting purge compressor so that the pressure of purge air is below the pressure of the compressor air from the discharge port 202. COPYRIGHT: (C)1999,JPO

Liquid fuel for gas turbine and waer injection purge system

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Liquid fuel and water injection purge systems for a gas turbine

Liquid fuel for gas turbine and waer injection purge system