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Method and device for the control of thermoacoustic instabilities or oscillations in a combustion system

a technology of thermoacoustic instabilities and combustion systems, applied in the direction of combustion types, machines/engines, lighting and heating apparatus, etc., can solve the problems of adverse effect on the proper operation of gas turbine plants, the inability to obtain corresponding actuators, and the practical problem of generating a corresponding actuator

Inactive Publication Date: 2003-11-13
ALSTOM TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0007] The object is achieved by means of the features of claims 1 and 4 taken as a whole. The essence of the invention is to use, instead of the dominant instability modes themselves, their subharmonic for the control device and modulation. The dominant instability modes can thereby be attenuated or suppressed, without correspondingly high-frequency actuators having to be used for modulation.

Problems solved by technology

Thermoacoustic oscillations, in particular, may have an adverse effect on the proper operation of gas turbine plants.
When the unstable modes are at high frequencies, the obtainability and affordability of corresponding actuators present a practical problem because of the rarity of such components.

Method used

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  • Method and device for the control of thermoacoustic instabilities or oscillations in a combustion system
  • Method and device for the control of thermoacoustic instabilities or oscillations in a combustion system
  • Method and device for the control of thermoacoustic instabilities or oscillations in a combustion system

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Embodiment Construction

[0016] A block diagram of a control device used in the invention is illustrated in FIG. 1. The control device 10 comprises a control loop 17, in which are arranged a bandpass filter 11, a delay and amplification unit 12, a modulation device 13, a modulation channel 14, the combustion system 15 (burner and combustion chamber) to be influenced and the control unit 16. The pressure oscillations (P' in FIG. 1) or the heat release oscillations (OH in FIG. 1) in the combustion system 15 are measured by means of methods known from the prior art mentioned and the resulting measurement signal is fed back via the control unit 16 and the bandpass filter 11. The filtered signal is amplified and time-delayed in the delay and amplification unit 12, in order to obtain the desired phase change. The delay unit within the delay and amplification unit 12 is set to an optimized delay value by means of the control unit 16 and then delivers the amplified and phase-shifted signal to the modulation device ...

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Abstract

In a method for the control of thermoacoustic instabilities or oscillations in a combustion system (15), pressure oscillations and / or heat release oscillations in the combustion system (15), which are linked to the thermoacoustic instabilities, are measured, the resulting measurement signal is filtered, time-delayed and amplified, and, according to the filtered, delayed and amplified measurement signal, the fuel stream to or the combustion air for the combustion system (15) is modulated. In such a method, the use of more cost-effective modulation devices is achieved in that modulation takes place at a subharmonic of a dominant instability frequency in the combustion system (15).

Description

[0001] The present invention relates to the field of technology of combustion systems, in particular for gas turbines. It relates to a method for the control of thermoacoustic instabilities or oscillations in a combustion system, according to the preamble of claim 1, and to a device for carrying out the method.PRIOR ART[0002] Modern high-performance combustion systems for gas turbines require high-efficiency operation which is free of thermoacoustic oscillations, entails virtually no emissions and has a low blow-out limit in the lean mode. Thermoacoustic oscillations, in particular, may have an adverse effect on the proper operation of gas turbine plants. Even in the past, therefore, active control mechanisms have been used in order to suppress thermoacoustic instabilities which originate from coupling between heat release and acoustic modes in the combustion system. These control mechanisms have generally pulsed the combustion air or modulated the fuel injection and at the same tim...

Claims

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Application Information

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IPC IPC(8): F02C9/26F23M20/00F23N5/16F23N5/24F23R3/00
CPCF02C9/26F23K2900/05003F23N5/16F23N5/24F23M20/005F23R2900/00013F23R2900/00014F05D2260/962F23R3/00
Inventor GUTMARK, EPHRAIM J.PASCHEREIT, CHRISTIAN OLIVER
Owner ALSTOM TECH LTD
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