Active control method for burning instability of combustion gas turbine combustor

A technology for unstable combustion and gas turbines, which is applied to combustion methods, combustion control, and fuel supply regulation. Safe operation, clear and simple control logic

Inactive Publication Date: 2014-05-21
BEIJING HUAQING GAS TURBINE & INTEGRATED GASIFICATION COMBINED CYCLE ENG TECH
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  • Abstract
  • Description
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Problems solved by technology

In the US6059560 patent document, a method of periodically adjusting the equivalence ratio is proposed to realize the active control of combustion instability, but the adjustment process of this method is relatively complicated, and it is difficult to apply in actual engineering

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  • Active control method for burning instability of combustion gas turbine combustor
  • Active control method for burning instability of combustion gas turbine combustor
  • Active control method for burning instability of combustion gas turbine combustor

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Embodiment Construction

[0020] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0021] The present invention provides an active control method for combustion instability in a combustion chamber of a gas turbine, the control flow of which is as follows figure 1 As shown, the specific methods include:

[0022] 1) Install a dynamic pressure sensor on the end cover part of the gas turbine combustion chamber or the wall of the flame tube, and the dynamic pressure sensor measures the dynamic pressure signal with a set time step t;

[0023] 2) Send the original dynamic pressure signal in the combustion chamber collected by the dynamic pressure sensor to the signal processing unit, and record the original signal as P(t), t∈[τ 1 ,τ 2 ]; τ 1 is the time to start recording data, τ 2 is the moment at which data recording ends;

[0024] 3) The original dynamic pressure signal is denoised by the prepr...

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Abstract

The invention provides an active control method for burning instability of a combustion gas turbine combustor. The method comprises the steps that an end cover or the wall surface of a flame tube of the combustion gas turbine combustor is provided with a dynamic pressure sensor; dynamic pressure original signals of the interior of the combustor are collected by the dynamic pressure sensor and sent to a signal processing unit; de-noising processing is conducted on the dynamic pressure original signals through a preprocessor, Fourier series expansion is conducted on the processed dynamic pressure signals through the signal processing unit, and superposed signals of direct-current signals and harmonic signals with different frequency components are obtained; harmonic signal components with the amplitude exceeding a set amplitude threshold valve in the harmonic signals are kept, and frequency, the amplitude and phase information of the kept harmonic signals are sent to a controller; a controller drives a rapid response valve according to input information to input common-frequency stimulation with a 180-degree phase difference with the corresponding frequency harmonic signals for fuel flow, so that high-amplitude pressure pulsation in the combustor is restrained, and therefore active control over burning instability is achieved.

Description

technical field [0001] The invention relates to a combustion control method of an industrial gas turbine, in particular to an active control method for combustion instability. Background technique [0002] In order to reduce emissions and obtain higher combustion efficiency, more and more modern industrial gas turbine combustors use fuel-air premixed combustion. The emission performance of the lean oil premixed combustion system is better than that of the traditional non-premixed system, but its development is limited by combustion instability; its combustion stability range is very narrow and cannot adapt to the requirements of gas turbines in a wide range of changes; The stable combustion process produces low-frequency and high-amplitude pressure vibrations, which not only affect the combustion performance of the combustion chamber, but may also damage the structure of the combustion chamber in severe cases. [0003] In order to avoid the destructive effect of combustion ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23N1/00
Inventor 谢法井文明
Owner BEIJING HUAQING GAS TURBINE & INTEGRATED GASIFICATION COMBINED CYCLE ENG TECH
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