Gas turbine engine fuel supply arrangement using plural distinct fuels
View Patent ↗A fuel supply arrangement for a gas turbine burner is provided. The fuel distribution arrangement includes a rear section external to the burner located between a turbine wall and a fuel distribution system interface directing fuel into fuel supply circuits. The fuel distribution system interface has four fuel connections. An intermediate section is located between the turbine wall and the backside wall of a distribution chamber; and a front section in front of the second section located between said backside wall of the distribution chamber and a burner central backside block. The fuel distribution arrangement includes pipes for gaseous fuel, liquid fuel, as well as pilot gas, and liquid pilot fuel. In the rear section the pipes for gaseous fuel and for liquid fuel are arranged concentrically, and in at least one portion of the intermediate section the pipe for gaseous fuel is arranged non-concentrically with the liquid fuel pipe.
1. A fuel supply arrangement for a gas turbine burner ( 16 ), comprising a rear section (C) external to the burner ( 16 ) located between a turbine wall ( 27 ) and a fuel distribution system interface ( 19 ) directing fuel into fuel supply circuits, said fuel distribution system interface ( 19 ) having four fuel connections, for liquid fuel, gaseous fuel, pilot gas and liquid pilot fuel; an intermediate section (B) located between the turbine wall ( 27 ) and the backside wall ( 28 ) of a distribution chamber ( 33 ); and a front section (A) in front of the second section (B) located between said backside wall ( 28 ) of the distribution chamber ( 33 ) and a burner central backside block ( 29 ); said fuel distribution arrangement comprising a pipe ( 8 ) for gaseous fuel, a pipe ( 1 ) for liquid fuel, particularly oil, as well as a pipe ( 5 ) for pilot gas, and a pipe for liquid pilot fuel ( 6 ), particularly pilot oil;
wherein in the rear section (C) the pipe ( 8 ) for gaseous fuel and the pipe ( 1 ) for liquid fuel are arranged concentrically, and in at least one portion of the intermediate section (B) the pipe ( 8 ) for gaseous fuel is arranged non-concentrically with the liquid fuel pipe ( 1 ).
2. Fuel supply arrangement of claim 1 , wherein in at least one portion of the intermediate section (B) the gaseous fuel pipe ( 8 ) is comprised of at least one pipe ( 8 a ) outside the periphery of the wall of the liquid fuel pipe ( 1 ).
3. Fuel supply arrangement of claim 2 , wherein the at least one portion of the intermediate section (B) the gaseous fuel pipe ( 8 ) is comprised of at least one, preferably 2, 3, 4, or 5 pipes ( 8 a ).
4. Fuel supply arrangement according to claim 1 , wherein in the rear section (C) the gaseous fuel pipe ( 8 ) is at least one of comprised of or bordered by an inner pipe ( 4 ) and an outer pipe ( 3 ) and that in the rear section (C) the liquid gas pipe ( 1 ) is arranged coaxially and concentrically within said inner gaseous fuel pipe ( 4 ).
5. Fuel supply arrangement according to claim 1 , wherein in at least one portion of the rear section (C) at least one of the pilot gas pipe ( 5 ) or the liquid pilot fuel pipe ( 6 ) is guided within the gaseous fuel pipe ( 8 ).
6. Fuel supply arrangement according to claim 1 , wherein in the rear section (C) the liquid fuel entry port ( 39 ) is located in the fuel distribution system interface ( 19 ) such that the liquid fuel is axially introduced into the liquid fuel pipe ( 1 ) from the rear and at least one of the gaseous fuel entry port ( 24 ) or the pilot gas entry port ( 25 ) is located in the fuel distribution system connection block ( 2 ) such that at least one of the gaseous fuel or the pilot gas is radially introduceable into at least one of the gaseous fuel pipe ( 8 ) or the pilot gas pipe ( 5 ) or the liquid pilot fuel pipe ( 6 ), preferably perpendicular to a liquid fuel flow direction (F).
7. Fuel supply arrangement according to claim 1 , wherein in at least one portion of the rear section (C) at least some of the fuel pipes ( 1 , 8 ) are arranged as three concentric pipes ( 3 , 4 , 31 ).
8. Fuel supply arrangement according to claim 1 , wherein in the intermediate section (B) the gaseous fuel pipe ( 8 a ) is provided individually from, parallel to and axially offset to the liquid fuel pipe ( 1 ).
9. Fuel supply arrangement according to claim 1 , wherein between the gaseous fuel pipe ( 8 ) in the rear section (C) and the gaseous fuel pipe ( 8 ) in the intermediate section (B), an interface ( 32 ) is provided, said interface ( 32 ) being disposed at an angle (α) adapted to guide the gaseous fuel frontwardly and outwardly with respect to the longitudinal axis (L) of the fuel supply arrangement.
10. Fuel supply arrangement according to claim 1 , wherein the liquid fuel pipe ( 1 ) is provided as a fuel lance ( 31 ) extending parallel to the longitudinal axis (L) of the fuel supply system and over all three sections (A, B, C) thereof until an injection port of the liquid fuel at the front tip ( 34 ) of the fuel lance ( 31 ) into the mixing section of a burner ( 16 ).
11. Fuel supply arrangement according to claim 1 , wherein in the intermediate section (B) the gaseous fuel pipe ( 8 a ) is provided parallel to the fuel lance ( 31 ).
12. Fuel supply arrangement according to claim 1 , wherein in at least one portion of at least one of the three sections (A, B, C) of the fuel supply system at least one fuel pipe ( 3 , 4 , 5 a , 6 a , 8 a , 31 ) is designed such as to compensate for thermal expansion during operation.
13. Fuel supply arrangement according to claim 11 , wherein at least one of the liquid pilot fuel pipe ( 6 a ) or the pilot gas pipe ( 5 a ) is arranged as a spiral or as at least one essentially circumferential portion around at least one of the fuel lance ( 31 ) or another fuel pipe.
14. Fuel supply arrangement according to claim 1 , wherein a mounting support ( 2 , 7 , 11 a , 15 ) for the fuel lance ( 31 ) is provided.