Methods and apparatus for operation of gas turbines
AssigneeGeneral Electric Company
InventorsEric J. Kress, Curtis L. Brown, Douglas M. Fortuna
Life of this patent
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Abstract
An operating system includes a fuel and control sub-system which includes a main gas circuit, a start gas circuit, a dual fuel nozzle, and a plurality of metering valves. The fuel and control sub-system is configured to transition the operation of the engine from operating with a start gas having a high heating value to using a main gas having a low heating value. The sub-system is further configured to inject water into the gas turbine and permits a user to adjust an overall fuel heating value to improve flammability limits and avoid regions of combustor acoustics.
Claims20
A method for delivering fuel through an operating system to a gas turbine engine, the operating system including a fuel sub-system including a main gas circuit and a start gas circuit, the fuel sub-system configured to deliver a first fuel and a second fuel to the gas turbine, and a control sub-system including a plurality of metering valves, the control sub-system for controlling the fuel sub-system, said method comprising the steps of:
- supplying a fuel through a block valve to the main gas circuit and through a block valve to the start gas circuit;
- using the control sub-system to direct the fuel from the fuel sub-system to the gas turbine engine through a plurality of metering valves;
- and
- using the control sub-system to direct fuel from the main gas circuit through a purge line including a block valve to the start gas circuit to prevent hot combustion gas ingestion between the main and start gas circuits.
An operating system for a gas turbine engine comprising:
- a fuel sub-system comprising a main gas circuit and a start gas circuit, said fuel sub-system configured to deliver to the gas turbine a first fuel and a second fuel;
- and
- a control sub-system configured to control said fuel sub-system for preventing hot combustion gas ingestion within said fuel sub-system, said control sub-system comprising a plurality of metering valves and a purge line connected between said main gas circuit and said start gas circuit, said purge line comprising at least one block valve, said main gas circuit comprising a block valve upstream from said purge line, said start gas circuit comprising a block valve upstream from said purge line.
An apparatus for delivering fuel to an operating system for a gas turbine engine, said apparatus comprising:
- a fuel and control sub-system comprising at least two metered gas fuel circuits, a fuel nozzle, and a plurality of metering valves connecting said fuel nozzle to said fuel circuits, said fuel and control sub-system configured to supply a plurality of fuels to the gas turbine engine;
- and
- a purge line connected between said two metered gas fuel circuits for preventing recirculation between said two metered gas fuel circuits, said purge line comprising a block valve, each said metered gas fuel circuit comprising at least one block valve upstream from said purge line.
Dependencies are inferred from the claim text.