A liner assembly that regulates air flow in a combustion zone

Abstract

The invention discloses a bush assembly capable of adjusting air flow of a combustion zone so as to solve the problem that lean-oil flameout of idling rating in a currently-occurring condition. The bush assembly comprises an bush out wall, a sealing sleeve, a floating body and a moving mechanism, wherein the bush outer wall is of a annular shape, and an installing hole is formed in an upstream endof the bush outer wall, the sealing sleeve is in a cylindrical shape and is coaxially fixed with the installing hole, and a floating channel is formed inside the sealing sleeve, the floating body isarranged on the inner side of the sealing sleeve in a coaxial mode, and can move up and down inside the floating channel, and the moving mechanism is connected with the floating body and controls thefloating body to move up and down. The bush assembly capable of adjusting air flow of combustion zone has the beneficial effects that the area of an air flow channel is changed by changing the heightof the bush outer wall, and therefore the air flow rate is changed, and the jet angle of an air inlet hole is finally influenced, the effect of adjusting the air flow of an annular region is achieved;the oil-gas ratio of the annular region can be adjusted by adjusting the air flow of the annular region, so that the phenomenon of lean-oil flameout of a combustor in the idling rating is prevented;and meanwhile, when the combustor works in a pre-mixing mode, the air amount of the annular region can be increased, so that the premixed effect of fuel and air is enhanced.

Description

technical field [0001] The invention belongs to the field of low-emission combustion chambers of gas turbines, and relates to a liner assembly, in particular to a liner assembly capable of adjusting air flow in a combustion zone. Background technique [0002] A typical gas turbine combustor has primary and secondary fuel nozzles. This type of burner has four operating modes, namely main mode, lean-lean, auxiliary mode and premix mode. Main mode is used to fire the burner when only fuel is being delivered to the main nozzle. In lean-lean mode, the secondary nozzles are also fired and fuel is delivered to the primary and secondary nozzles. In auxiliary mode, fuel is delivered to the auxiliary nozzles only, thereby extinguishing the flame at the main nozzles. Whereas in premixed mode, fuel is delivered to the primary and secondary nozzles, but the flame is only present in the secondary nozzle area, and the premixed fuel gas mixture is optimized for desired performance includ...

AI Technical Summary

Problems solved by technology

To avoid lean flameout, many burners operate under richer conditions, but these conditions result in higher flame temperatures and greater NO emissions

[0004] The existing combustion chamber adopts lean premixed combustion to reduce the emission of pollutants in the combustion chamber, which is called DLN combustion chamber. In the idle state, the fuel quantity is low, and the risk of lean fuel flameout is greater

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