Combustor of a gas turbine having a nozzle pipe stand
Manifolds are shaped cross star having curved surfaces inside thereof, and holes are bored in four corners of the manifolds. In mounting a combustor to a casing, oil in the manifolds is transmitted to the holes by way of the curved surfaces. As a result of this, oil is prevented from staying, and coking is prevented from occurring, inside the manifolds.
1. A combustor for a gas turbine comprising:
a nozzle pipe stand having a plurality of main nozzles around a pilot nozzle and mounted to a casing through a sleeved mounting flange;
a manifold that branches oil-fuel in an oil supply line to the main nozzles; and
a heat insulating portion disposed between the sleeved mounting flange and the manifold,
wherein said heat insulating portion comprises a closed air space.
2. A combustor for a gas turbine comprising:
a nozzle pipe stand having a plurality of main nozzles around a pilot nozzle and mounted to a casing;
a manifold that branches oil-fuel in an oil supply line to the main nozzles; and
a sleeved mounting flange, which holds the main nozzles and is joined to the nozzle pipe stand; and
a sleeve through which the pilot nozzle passes is joined to an end of the sleeved mounting flange with a closed air gap formed between said sleeve and said sleeved mounting flange.
3. A combustor for a gas turbine comprising:
a nozzle pipe stand having a plurality of main nozzles around a pilot nozzle and mounted to a casing through a sleeved mounting flange; and
a manifold having a plurality of holes bored on a first imaginary circle to branch oil-fuel in an oil supply line to the main nozzles, wherein the manifold has concave portions protruding inwardly.
4. The combustor according to claim 3 , wherein the manifold is mainly formed in a center side of the first circle than on straight lines that link the neighboring holes.
5. The combustor according to claim 3 , wherein the manifold is mountain shaped toward the center side of the first circle between the neighboring holes.
6. The combustor according to claim 3 , wherein the manifold is cross star shaped being formed by curved surfaces, and the holes are bored on four corners of the manifold.
7. The combustor according to claim 3 , wherein the manifold includes a circular space being formed in the nozzle pipe stand, inner surfaces of the manifold are curved.
8. The combustor according to claim 3 , further comprising a purging unit to purge inside the manifold.
9. The combustor according to claim 3 , further comprising a heat insulating portion in between the sleeved mounting flange and the manifold, wherein said heat insulating portion comprises a closed air space.