Combustion chamber premix fuel nozzle with diversion structure

Abstract

A combustion chamber premixed fuel nozzle with a flow-guiding structure belongs to the technical field of gas turbines. The nozzle contains a hanging flange, an outer pipe, an inner pipe, an air cyclone and a drainage structure; the drainage structure is arranged between the suspension flange and the air cyclone, and the structure includes a first air guiding plate and a second air guiding plate and the guide plate mounting plate; the windward surfaces of the first air guide plate and the second air guide plate are arc-shaped; one side of the first air guide plate and the second air guide plate are respectively nested on the outer pipe, and relative to the outer pipe The axis is symmetrically arranged. One end of the first air guide plate and the second air guide plate is installed on the air cyclone through the guide plate mounting plate, and the other end is placed in the air. The drainage structure can effectively reduce the air radial velocity at the air cyclone inlet, improve the air axial velocity distribution there, and help improve the mixing of fuel and air, thereby effectively reducing NOx emissions and preventing the occurrence of flashback and flame adhesion .

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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