COMBUSTION CHAMBER PREMIXING CAVITY Russian patent published in 1997 - IPC

FIELD: gas-turbine plants. SUBSTANCE: premixing cavity contains circular row of burners provided with fuel feed devices 1, air supply branch pipes 2 of round section and pilot burner made in form of vane swirler 3 in whose bush fuel feed device 4 is arranged. Three cowlings are located at outlet of air supply branch pipes 2; they are located coaxially relative to one another and to axis of combustion chamber. Center cowling passes through axes of burners and outer cowling 6 and inner cowling 7 embrace circular row of burners both inside and outside and form two circular chambers 8 and 9 together with center cowling; arranged inside chambers 8 and 9 are guide vanes 10 for swirling the flows in circular chambers towards each other. Length of outer cowling 6 and inner cowling 7 is more than that of center cowling 5 and their projecting parts form circular mixing prechamber 11 which is brought in communication with fire zone 12. Jets of air and fuel fed to mixing prechamber are intensively mixed and air-fuel mixture thus prepared is directed to fire zone where it is lit up by pilot burner flame and is burnt. During combustion of homogeneously prepared air-fuel mixture, high-temperature zones are absent in flame, thus reducing formation of oxides and toxicity of combustion products. EFFECT: reduced formation of oxides and reduction of toxicity of combustion products. 4 dwg