Patent ID: 7661269

Claim:
A turbine burner ( 1 ) comprising a secondary feed unit for the supply of a secondary or backup mixture and the discharge of said mixture from an opening ( 4 ) to a combustion zone ( 6 ) facing said opening ( 4 ), said secondary feed unit comprising an axial air tube ( 14 ) terminating in an axial swirler ( 18 ); a primary feed unit comprising a primary mixture tube ( 22 ) and a primary mixture channel ( 24 ) intended for the supply of a primary mixture, arranged concentrically with said secondary feed unit and with said axial air tube ( 14 ), said primary mixture channel ( 24 ) having a fluid flow connection to said primary mixture tube ( 22 ), wherein said primary mixture channel ( 24 ) comprises an annular wall ( 28 ) forming, at a distance radially from the axial air tube ( 14 ), a cavity ( 29 ), and extending axially far enough to be close to the combustion zone ( 6 ), being thus capable of conveying said primary mixture directly to said combustion zone ( 6 ) facing said opening ( 4 ), directly downstream of the opening ( 4 ) of said axial swirler ( 18 ), and wherein the primary mixture channel ( 24 ) provides for a nozzle ring ( 26 ) having a plurality of primary mixture holes ( 32 ), passing through said ring, so as to provide fluid flow communication between the primary mixture tube ( 22 ) and the cavity ( 29 ) between the annular wall ( 28 ) of the primary mixture channel ( 24 ) and the axial air tube ( 14 ), whereby the primary mixture coming from the primary mixture tube ( 22 ) passes through said primary mixture holes ( 32 ) which impart to said primary mixture a swirling and turbulent motion along the cavity ( 29 ) until, maintaining this vigorous swirling motion, said primary mixture arrives directly at the combustion zone ( 6 ) facing the outlet of the axial swirler ( 18 ).