Fuel supply device for inhibiting combustion instability, combustion equipment and control method

Abstract

The invention provides a fuel supply device for inhibiting combustion instability, combustion equipment and a control method, The fuel supply device for inhibiting the combustion instability comprisesan oil tank, a booster pump and a phase frequency adjusting device, wherein the oil tank is used for storing fuel oil, and is used for increasing the pressure of the fuel oil in a pipeline; the phasefrequency adjusting device is used for adjusting the frequency of the fuel oil sprayed in a combustion chamber and a phase in real time according to the difference value of the fuel oil phase in thepipeline and the combustion chamber, so that pressure pulsation in the combustion chamber is inhibited. The fuel supply device for inhibiting the combustion instability is used for measuring the phaseof the fuel oil in the pipeline and the phase of the combustion chamber in real time by arranging a first dynamic pressure sensor and a high-frequency dynamic pressure sensor; and the frequency and the phase of the oil supply are adjusted in real time by arranging a high-frequency electromagnetic valve and a phase shifter, so that when the phase difference value of the fuel oil in the pipeline and the phase difference value of the fuel oil in the combustion chamber are smaller than 90 degrees, the frequency and the phase of the oil supply can be timely adjusted, and the pressure pulsation generated by combustion in the combustion chamber can be effectively inhibited.

Description

technical field [0001] The disclosure relates to the technical field of combustion instability control of power plants, and in particular to a fuel supply device, combustion equipment and control method for suppressing combustion instability. Background technique [0002] When working in the combustor of a gas turbine or an aero-engine, the use of lean-fuel premixed combustion can reduce combustion temperature and NOx emissions. At the same time, lean-fuel premixed combustion is also prone to combustion instability. Pulsation not only affects the combustion performance, but also can lead to the destruction of the combustion chamber structure in severe cases. Therefore, it is very important to solve the problem of combustion instability that easily occurs in lean premixed combustion. The mechanism of thermoacoustic instability in combustion is determined by the Rayleigh criterion: when the flame heat release pulsation is the same as the sound field of the combustion chamber, ...

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Problems solved by technology

[0004] However, in the process of realizing the present disclosure, the inventors of the present application found that because the combustion thermoacoustic instability is difficult to predict, there are two deficiencies in the passive combustion control method: one is that the effective range of application is small, and the passive control is only for a specific The operating state of the equipment works, and often loses its effect in the low-frequency region, and the destructive power of low-frequency oscillation is quite large; second, passive control can only be developed for a specific type of burner, and it is not universal

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