Combustion chamber for a gas turbine
A combustion chamber for an industrial gas turbine has thermal protective elements which are installed along the inner circumference of its casing. The thermal protective elements are cooled by cooling air which is added to the fuel in the region in front of a front casing section after the cooling. A brush seal is installed between the front casing section and the thermal protective elements, where the brush seal is configured in segments. The combustion chamber can be sealed against leakages of cooling air in all operating states of the combustion chamber.
1. A combustion chamber for a gas turbine, wherein the combustion chamber comprises:
a burner;
a casing;
a front casing section in which the burner is installed;
thermal protective elements provided in individual separated segments along an inner circumference of the casing and forming a cooling air passage between the casing and the thermal protective elements, the cooling air passage in fluid communication with an opening for a source of cooling air;
a brush seal extending between the front casing section and the thermal protective elements, which extends beyond the circumference of the front casing section, the brush seal placed to block cooling air from the cooling air passage from entering the combustion chamber; and
wherein the brush seal is shaped in individual separated segments, and each segment of the brush seal is in contact with at least two segments of the thermal protective elements.
2. The combustion chamber as claimed in claim 1 , wherein the brush seal is fastened on the front casing section, and the bristles of the brush seal extend from the front casing section to the thermal protective elements.
3. The combustion chamber as claimed in claim 1 , wherein the bristles of the brush seal extend from their base at an angle other than a right angle, to a radial of the combustion chamber and to the circumferential tangent of the combustion chamber.
4. The combustion chamber as claimed in claim 3 , wherein the angle to the radial lies within a range of 40-50°.
5. The combustion chamber as claimed in claim 1 , wherein the surface with which the ends of the bristles of the brush seal are in contact has a coating.
6. The combustion chamber as claimed in claim 5 , wherein the coating is a wear-resistant coating.
7. The combustion chamber as claimed in claim 1 , wherein the bristles of the brush seal are pretensioned.
8. The combustion chamber as claimed in claim 7 , wherein for the brush seal, a brush seal is used which is fastened on the front casing section by means of pressing in.
9. The combustion chamber as claimed in claim 1 , in combination with an industrial, stationary gas turbine.
10. The combustion chamber as claimed in claim 1 , wherein a slot is located along the circumference of the front casing section, and for the brush seal, a brush seal is used which by pressing in is fastenable in a frictional and positive locking manner in the slot with clamping effect.
11. The combustion chamber as claimed in claim 3 , wherein a slot is located along the circumference of the front casing section, and for the brush seal, a brush seal is used which by pressing in is fastenable in a frictional and positive locking manner in the slot with clamping effect.
12. The combustion chamber as claimed in claim 3 , wherein the surface with which the ends of the bristles of the brush seal are in contact has a coating.
13. The combustion chamber as claimed in claim 11 , wherein the surface with which the ends of the bristles of the brush seal are in contact has a coating.
14. The combustion chamber as claimed in claim 1 , wherein the cooling air is extracted from a compressor for the gas turbine.
15. The combustion chamber as claimed in claim 1 , wherein a direction of cooling air flow in the cooling air passage is substantially opposite a direction of fuel flow into the burner.
16. The combustion chamber as claimed in claim 1 , wherein the cooling air passage is arranged in the burner to supply cooling air to fuel supplied to the burner.