Air inlet structure for fuel nozzle of gas turbine

Abstract

The invention relates to the technical field of gas turbines, and provides an air inlet structure for a fuel nozzle of a gas turbine. The fuel nozzle comprises a center air channel and a fuel cavity which are communicated with each other, and the center air channel is used for connecting the air into the fuel cavity. A nozzle hanging flange is arranged at one end of the center air channel, and the nozzle hanging flange is provided with air inlet channels used for connecting the air into the center air channel. The nozzle hanging flange is movably sleeved with an adjusting sleeve, and the adjusting sleeve is used for limiting the sizes of openings of the air inlet channels through axial movement. By axially adjusting the adjusting sleeve, the flow of the air entering the center air channel can be adjusted, hence, it is guaranteed that fuel and air have a good pre-mixing effect, tempering can be prevented from happening to a nozzle outlet, and the reliability of the nozzle is improved; in addition, stepless speed change of the gas turbine can be achieved through the adjusting sleeve.

Description

technical field [0001] The invention relates to the technical field of gas turbines, in particular to an air intake structure of a gas turbine fuel nozzle. Background technique [0002] The traditional gas turbine combustor adopts diffusion combustion technology. Due to the local high temperature in the combustion chamber, the pollutant emissions, especially the nitrogen oxide emissions, are relatively high. The combustor using premixed combustion for gas turbine power generation technology is one of the clean energy technologies, which can effectively reduce pollutant emissions while meeting the power generation load requirements. Among them, the design of the gas turbine combustor nozzle is particularly important for organizing combustion and reducing pollutant emissions. [0003] In the prior art of premixed fuel nozzles, the rear of the nozzle is prone to flashback, so a light blow of air is required to protect the rear of the nozzle. However, the flow rate of light bl...

AI Technical Summary

Problems solved by technology

[0003] In prior art premixed fuel nozzles, flashback is prone to occur behind the nozzle, requiring a light blow of air to protect the rear of the nozzle

However, the flow rate of light blowing air is often different in different environments and climates. A low flow rate of light blowing air will lead to backfire, resulting in the head being burned, which seriously affects the safety and reliability of the gas turbine.

Images