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

Abstract

The disclosure provides a fuel supply device for suppressing combustion instability, combustion equipment and a control method. The fuel supply device for suppressing combustion instability includes: a fuel tank, a booster pump, and a phase frequency adjustment device; the fuel tank is used to store fuel, and is used to To pressurize the fuel in the pipeline, the phase frequency adjustment device adjusts the frequency and phase of the fuel injected into the combustion chamber in real time according to the phase difference between the fuel in the pipeline and the combustion chamber, and suppresses the pressure pulsation in the combustion chamber. The fuel supply device for suppressing combustion instability provided by the present disclosure measures the phase of the fuel in the pipeline and the combustion chamber in real time by setting the first dynamic pressure sensor and the high-frequency dynamic pressure sensor, and by setting the high-frequency solenoid valve and the phase shifter Adjust the frequency and phase of the fuel supply in real time, so that when the phase difference between the fuel in the pipeline and the combustion chamber is less than 90°, the frequency and phase of the fuel supply can be adjusted in time to effectively suppress the pressure pulsation generated by the combustion in the combustion chamber.

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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