Premixed fuel nozzle for combustor and with drainage structure

Abstract

The invention belongs to the technical field of gas turbines and relates to a premixed fuel nozzle for a combustor and with a flow glide structure. The nozzle comprises a suspension flange, an outer pipe, an inner pipe, an air cyclone and the flow glide structure, wherein the flow glide structure is arranged between the suspension flange and the air cyclone; the flow glide structure comprises a first air flow glide plate, a second air flow glide plate and a flow glide plate installing plate, wherein the windward face of the first air flow glide plate and the windward face of the second air flow glide plate are in arc shapes, one side of the first air flow glide plate and one side of the second air flow glide plate are respectively embedded on the outer pipe and are symmetrically distributed relative to the axis of the outer pipe, one end of the first air flow glide plate and one end of the second air flow glide plate are arranged on the air cyclone through the flow glide plate installing plate, and the other end of the first air flow glide plate and the other end of the second air flow glide plate are suspended in the air. The flow glide structure can effectively reduce the radial speed of air at an inlet of the air cyclone, improves the air axial speed distribution at the inlet of the air cyclone, improves mixing between fuel and the air, effectively reduces NOx emission and avoids tempering and flame attachment.

Description

technical field [0001] The invention relates to a gas turbine combustion chamber nozzle, in particular to a combustion chamber premixed fuel nozzle with a drainage structure, belonging to the technical field of gas turbines. Background technique [0002] A specific dry low NOx emission combustion system includes multiple combustion chambers arranged in an annular array around the axis of the turbine rotor, each combustion chamber mixes air and fuel prior to combustion, and then ignites the mixture, resulting in high temperature and high pressure combustion gas. The fuel injection system for various combustion chambers consists of a plurality of fuel nozzles mounted on an end cover at the upstream end of the combustion chamber. If the fuel and air are not mixed well before combustion, localized hot spots can form in the combustion chamber. Localized hotspots can increase NOx emissions and increase the chance of flames in the combustion chamber flashing back into the nozzle ...

AI Technical Summary

Problems solved by technology

The uniformity of mixing can be increased to a certain extent by increasing the number of nozzles, but since the nozzles are arranged on the periphery, there will be a radial velocity component in the air flowing from the nozzles to the center, which will affect the air flow in the air cyclone flow, resulting in uneven mixing of air and fuel

Inhomogeneous mixing increases NOx emissions, affects flame stability and causes flashback / flame sticking

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