Gas-fuel low-pollution combustion chamber lean premixing swirl nozzle and full-ring combustion chamber

Abstract

The invention relates to a gas-fuel low-pollution combustion chamber lean premixing swirl nozzle and a full-ring combustion chamber. The gas-fuel low-pollution combustion chamber lean premixing swirlnozzle comprises an axial swirler, a fuel pipeline, fuel injection holes, a premixing section, an outlet convergence section and wall surface diffusion small holes, the plurality of fuel injection holes are located in a fuel boss at the tail end of the fuel pipeline, fuel sprayed by the fuel injection holes and the swirl air are uniformly mixed in the premixing section, the combustion equivalent ratio of the swirl nozzle ranges from 0.55 to 0.75, it is guaranteed that the temperature of a combustion region is relatively low and no local hot spots exist, so that the generation of nitrogen oxideis effectively reduced; a fuel / air mixture is accelerated to flow through the outlet convergence section, so that the backfire risk is reduced; the wall temperature and the boundary layer fuel / air ratio can be reduced through the wall surface diffusion small holes, so that the spontaneous combustion and backfire risks are reduced; in an actual combustion chamber, a multi-point lean premixing combustion chamber head is formed by reasonably arranging a certain number of swirl nozzles with the same size, and the main mold fuel staged supply is adopted so that the low-pollution emission level ofthe combustion chamber in the full working condition range can be realized.

Description

technical field [0001] The invention belongs to the field of gas turbine combustors, and relates to a gas fuel low-pollution combustor lean premix swirl nozzle and a full-ring combustor, in particular to a low-pollution combustor lean premix swirl nozzle solution suitable for gas fuel. Background technique [0002] In recent years, with the frequent occurrence of smog weather all over the country, people have gradually realized that the ecological environment problem has become an important issue affecting the survival of human society. Because the main elements of traditional energy fuels such as coal and petroleum are carbon, oxygen, hydrogen, nitrogen and sulfur, a large amount of harmful gases SOx and NOx will be produced after combustion, and a large amount of unburned particulate matter (PM2. 5, the chief culprit of smog), causing great pollution to the environment, so it is urgent to find clean energy. The main elements of natural gas, shale gas and other gases are c...

AI Technical Summary

Problems solved by technology

Through the analysis, it can be known that the above-mentioned nozzles increase the swirl flow channel along the radial or axial direction, although it can improve the uniformity of fuel / air mixing, but the structure is a bit complicated, the flow resistance is large, and there is no specific prevention of spontaneous combustion, tempering and oscillating combustion. measures

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