On a fuel supply system for a gas-turbine engine with a high-pressure supply line and a fuel metering unit, the fuel distribution system connected to staged or non-staged burners includes only one single fuel line (3) and the valve arrangements (7) connected to this fuel line and directly associated
On a fuel supply system for a gas-turbine engine with a high-pressure supply line and a fuel metering unit, the fuel distribution system connected to staged or non-staged burners includes only one single fuel line (3) and the valve arrangements (7) connected to this fuel line and directly associated to individual burners (4), with the valve arrangements (7) each having several cutoff valves (8 to 10), which are—independently of each other—individually or simultaneously electrically settable to a closed or open limit position, with the cutoff valves each featuring a specific, yet different cross-sectional area. The simply designed, low-wear and low-maintenance fuel supply and distribution system, avoids coking in the one fuel line in the hot engine section, and enables a binary-coded fuel supply to the respective burner. With a sufficient number of valves in each arrangement, the fuel metering unit can be omitted.
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1. A fuel supply system for a gas-turbine engine, comprising: a high-pressure supply line;a fuel distribution system connected to burners of the engine to control a fuel quantity supplied to individual burners, the fuel distribution system including a single fuel line and, directly associated with e
1. A fuel supply system for a gas-turbine engine, comprising: a high-pressure supply line;a fuel distribution system connected to burners of the engine to control a fuel quantity supplied to individual burners, the fuel distribution system including a single fuel line and, directly associated with each burner, a valve arrangement having a plurality of cutoff valves which are each independently electrically actuatable between a closed limit position and an open limit position, with each cutoff valve having a specific cross-sectional flow area (Ao to An) different than the other cutoff valves when the valves are in their open limit positions;wherein the valve arrangement is a staged valve arrangement for use with a staged burner having a pilot injection nozzle and a main injection nozzle for controllable fuel distribution, the plurality of cutoff valves including at least one pilot valve for increasing and decreasing fuel to the pilot injection nozzle and at least one main valve for increasing and decreasing fuel to the main injection nozzle, the at least one main valve comprising a first main valve and a second main valve, wherein the at least one pilot valve, the first main valve, and the second main valve each have a different one of the cross-sectional areas (Ao to An);each of the at least one pilot valve and the at least one main valve located within the single fuel line such that when the at least one main valve is in an open state, a pressure in the single fuel line is reduced to reduce flow through the at least one pilot valve when the pilot valve is in a state allowing fuel flow therethrough to the pilot injection nozzle. 2. The fuel supply system of claim 1, wherein different fuel flows reach the pilot injection nozzle depending on a completely or partly closed position of the main valves and the pilot valve, and with different fuel flows reaching the main injection nozzle depending on the closed or open position of the main valves. 3. The fuel supply system of claim 1, wherein the valve arrangement includes at least one chosen from: at least two cross-sectionally binary-dimensioned pilot valves A4 and A5, where A5=2A4, and, at least two cross-sectionally binary-dimensioned main valves A6 and A7, where A7=2A6. 4. The fuel supply system of claim 1, wherein the valve arrangement includes a plurality of cross-sectionally (A0=Amin. to An) binary-dimensioned binary valves, whose respective cross-sectional area is An=2n. Amin. 5. The fuel supply system of claim 1, wherein the electrically actuatable cutoff valves are each connected to signal lines, individually or in groups, and, collectively or in groups, to one or several return lines, which can also be used as alternative signal lines. 6. The fuel supply system of claim 5, wherein the cutoff valves are at least one of solenoid valves and piezo-electrical valves. 7. The fuel supply system of claim 1, wherein the cutoff valves are circumcirculated by fuel flow for cooling purposes. 8. The fuel supply system of claim 1, wherein the cutoff valves are incorporated into a single fuel line. 9. The fuel supply system of claim 1, wherein the valve arrangements or groups of valve arrangements can be actuated independently of each other. 10. The fuel supply system of claim 1, wherein individual valves of the valve arrangement are actuated by impulse-width modulation, enabling the fuel to be metered on a basis of actuation time and impulse width. 11. The fuel supply system of claim 1, wherein the individual cutoff valves have two defined limit positions and one center position. 12. The fuel supply system of claim 1, wherein the cutoff valves in a de-energized failure state assume at least one chosen from remaining in a last valve position and assuming a defined position. 13. The fuel supply system of claim 1, wherein individual valves of the valve arrangement are actuated by impulse-width modulation, enabling the fuel to be metered on a basis of actuation time and impulse width. 14. The fuel supply system of claim 2, wherein the pilot valve includes a primary cross-sectional area (Ao) and a smaller secondary cross-sectional area (A1) associated with the primary cross-sectional area (Ao), the pilot valve opening and closing the primary cross-sectional area (Ao) for altering a supply of fuel through the primary cross-sectional area (Ao) to the pilot injection nozzle, while leaving open the smaller secondary cross-sectional area (A1) for continuing to supply fuel to the pilot injection nozzle when the primary cross-sectional area (Ao) is in the closed state. 15. The fuel supply system of claim 14, wherein the secondary cross-sectional area (A1) is positioned on a portion of the pilot valve that moves to open and close the primary cross-sectional area (Ao).
Davis ; Jr. Lewis Berkley ; Balevic David Justin ; Beaudoin Ronald Joseph ; Mick Warren James, Fuel staging apparatus and methods for gas turbine nozzles.
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