Annular combustion chamber based on Venturi pre-mixing bispin nozzle

Abstract

The invention discloses an annular combustion chamber based on a Venturi pre-mixing bispin nozzle. The combustion chamber has a single-ring-cavity structure; a plurality of sets of combustion heads are arranged at the head of the annular combustion chamber; each set of combustion head is provided with a pre-combustion grade nozzle and a plurality of main-combustion grade nozzles; the main-combustion grade nozzles are symmetrically arranged along a radial direction of the annular combustion chamber by taking the pre-combustion grade nozzle as a center; each main-combustion grade nozzle is of a structural form that an outer ring sprays two grades of spinning flow around a Venturi pre-mixing center and comprises a main oil nozzle, an axial air spinner and a Venturi pre-mixing section which are coaxial; each axial air spinner has a two-grade spinning structure and is connected with the Venturi pre-mixing section; each main oil nozzle is arranged in the center of the axial air spinner; the outlet end face of each main oil nozzle is arranged at the throat of the Venturi pre-mixing section; and fuel is supplied to the pre-mixing grade nozzles and the main-combustion grade nozzles through two-channel fuel connection nozzles.

Description

Technical field [0001] The invention relates to a gas turbine combustion chamber technology, in particular to an annular combustion chamber based on a venturi premixed double-rotation nozzle. Background technique [0002] The main development trend of gas turbine combustor is low-pollution combustion. The newly developed gas turbine combustor must meet increasingly stringent pollutant emission standards. At present, the current standard CAEP6 (Committee on Aviation Environmental Protection) implemented by the combustion chamber of civil aviation gas turbines has been very strict, especially with regard to nitrogen oxides (NO x ), and the latest standard CAEP8 that will be implemented (implemented on January 1, 2014) even requires NO x Emissions should be reduced by more than 15% on the basis of the CAEP6 standard. The same applies to the pollutant emission standards for gas turbines for industrial power generation. The old version of GB 13223-2003 stipulates that fuel gas turbin...

AI Technical Summary

Problems solved by technology

[0004] For conventional combustion chambers, the liquid mist diffusion combustion method is usually adopted. In the high power state, the equivalence ratio near the combustion zone is around 1, which is far beyond the equivalence ratio range required for low-pollution combustion. At this time, CO and UHC emissions are relatively high small, but NO x The emission is very large; in the low power state, the equivalent ratio of the combustion zone is very low, which is far lower than the above-mentioned equivalence ratio range required for low-pollution combustion. At this time, the NO x Emissions are low, but CO and UHC emissions are high, so conventional combustors cannot meet the requirements for low pollution emissions over the entire operating range of gas turbines

Images