# US 10,287,993 B2 · Method and device for combustion with pulsed fuel split

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- Number: US 10,287,993 B2
- Document ID: US10287993B2
- Status: Granted
- Kind: B2
- Application number: 15/666,607
- Filed: 2017-08-02
- Published: 2017-11-16
- Granted: 2019-05-14
- Earliest claimed: 2010-10-13
- Assignees: Siemens Aktiengesellschaft
- Applicants: Siemens Aktiengesellschaft
- Inventors: Gavin Brickwood; Ghenadie Bulat
- Web page: https://patentgrep.com/patent/US10287993B2

## CPC

- F02C 9/28: Regulating systems responsive to plant or ambient parameters, e.g. temperature, pressure, rotor speed (F02C9/30 - F02C9/38, F02C9/44 take precedence)
- F23N 5/242: {using electronic means}
- F23R 3/34: Feeding into different combustion zones
- F23R 3/343: {Pilot flames, i.e. fuel nozzles or injectors using only a very small proportion of the total fuel to insure continuous combustion (ignition in gas-turbine plants F02C7/264; pilot flame igniters F23Q9/00)}
- F23N 2241/20: Gas turbines
- F23R 2900/00013: Reducing thermo-acoustic vibrations by active means
- F23R 2900/03281: Intermittent fuel injection or supply with plunger pump or other means therefor
- F02C: GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS (construction of turbines F01D; jet-propulsion plants F02K; construction of compressors or fans F04; generating combustion products of high pressure or high velocity F23R; using gas turbines in compression refrigeration plants F25B11/00)
- F23N: REGULATING OR CONTROLLING COMBUSTION (control devices specially adapted for combustion apparatus in which combustion takes place in a fluidised bed of fuel or other particles F23C10/28; condition responsive controls for regulating combustion in domestic stoves with open fires for solid fuel F24B1/187)
- F23R: GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS (fluidised bed combustion apparatus specially adapted for operation at superatmospheric pressures F23C10/16)

## Abstract

A method of operating a control unit for controlling at least two different input fuel flows to a combustion device, e.g. a gas turbine includes the step of determining on the basis of at least one operating parameter whether the combustion device is in a predefined operating stage. In response hereto, generating a control signal configured for setting a ratio of at least two different input fuel flows to a predetermined value (psc1, psc3) for a predetermined time (dt) in case the combustion device is in the predefined operating stage.

## Claims

### Claim 1

A method for operating a control unit for controlling at least two different input fuel flows to a combustion device, comprising:
receiving at least one operating parameter through a control input of the control unit;
determining whether the combustion device is operated in a predefined operating stage based on the at least one operating parameter; and
generating a control signal for setting a ratio of the at least two different input fuel flows to a predetermined value for a predetermined time in case the combustion device is in the predefined operating stage,
wherein the ratio of the at least two different input fuel flows is set to the predetermined value by changing the ratio of the at least two different input fuel flows from a present value to the predetermined value in a stepwise manner, and
wherein the ratio of the at least two different input fuel flows is set to the predetermined value for the predetermined time comprising a pulse shaped temporal change of the ratio of the at least two different input fuel flows.

### Claim 2 (depends on 1)

The method according to claim 1, wherein after the predetermined time the ratio of the at least two different input fuel flows is set to a value that corresponds to a control regime applied before setting the ratio of the at least two different input fuel flows to the predetermined value.

### Claim 3 (depends on 1)

The method according to claim 1, wherein the at least two different input fuel flows include:
a main fuel flow to a main combustion region of a combustor of the combustion device; and
a pilot fuel flow to a pilot region of the combustor of the combustion device.

### Claim 4 (depends on 1)

The method according to claim 1, wherein the at least one operating parameter comprises at least one of a temperature and a pressure.

### Claim 5 (depends on 1)

The method according to claim 1, further comprising the step of controllably splitting a supply fuel flow into the at least two different input fuel flows to a combustor through the generated control signal sent to a fuel split device.

### Claim 6 (depends on 1)

The method according to claim 1, wherein the combustion device comprises two or more combustors.

### Claim 7 (depends on 6)

The method according to claim 6, wherein the at least two different input fuel flows distributions are the same for all of the combustors.

### Claim 8 (depends on 6)

The method according to claim 6, wherein each combustor is individually controlled regarding its ratio between each of the at least two different input fuel flows.