A diversion structure of a combustor premixed fuel nozzle

Abstract

The invention discloses a drainage structure for a premixed fuel injection nozzle of a combustion chamber. The injection nozzle comprises a suspension flange, an outer pipe, an inner pipe, an air cyclone and the drainage structure; the drainage structure is arranged between the suspension flange and the air cyclone, and comprises a first air drainage plate, a second air drainage plate and a drainage mounting plate; the windward surface of the air drainage plate is arc-shaped; fin-shaped drainage pieces are arranged on the windward surface; a turbulent flow structure is arranged on each of the air drainage plate and the fin-shaped drainage piece. The two air drainage plates are respectively embedded into the outer pipe and are arranged symmetrically with respect to the axis of the outer pipe; one end of the first air drainage plate and one end of the second air drainage plate are mounted on the air cyclone; the other end of the first air drainage plate and the other end of the second air drainage plate are suspended. According to the structure, on one hand, the radial speed of the air at the inlet of the air cyclone can be effectively reduced, and the axial speed distribution of the air at the position is improved; on the other hand, small disturbance generated by the air helps to improve the mixing of a fuel and the air; therefore, the emission of NOx is effectively reduced; the tempering and the flame attachment are prevented.

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 NO x The exhaust combustion system consists of a plurality of combustors arranged in an annular array around the axis of the turbine rotor, each combustor mixing air and fuel prior to combustion and then igniting the mixture to produce high temperature and high pressure combustion gases. 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 may increase NO x and will increase the chances of flames in the combustion chamber flashing back into or adhering to the...

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

Uneven mixing will increase NO x Emissions, affecting flame stability and causing flashback / flame sticking

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