초록 ▼

The invention refers to a sequential combustor arrangement comprising a first burner, a first combustion chamber, a mixer for admixing a dilution gas via a dilution gas inlet to the hot gases leaving the first combustion chamber during operation, a second burner, and a second combustion chamber arra

The invention refers to a sequential combustor arrangement comprising a first burner, a first combustion chamber, a mixer for admixing a dilution gas via a dilution gas inlet to the hot gases leaving the first combustion chamber during operation, a second burner, and a second combustion chamber arranged sequentially in a fluid flow connection. The sequential combustor arrangement further includes four cooling zones with a cooling channel. During operation a cooling gas flows through the cooling channels. The disclosure further refers to a method for operating a gas turbine with such a sequential combustor arrangement.

대표청구항 ▼

1. A sequential combustor arrangement comprising: a first burner;a first combustion chamber;a mixer for admixing a dilution gas via a dilution gas inlet to the hot gases leaving the first combustion chamber during operation;a second burner; anda second combustion chamber arranged sequentially in a f

1. A sequential combustor arrangement comprising: a first burner;a first combustion chamber;a mixer for admixing a dilution gas via a dilution gas inlet to the hot gases leaving the first combustion chamber during operation;a second burner; anda second combustion chamber arranged sequentially in a fluid flow connection, wherein the mixer is configured to guide combustion gases in a hot gas flow path extending between the first combustion chamber and the second burner, the mixer having a duct with an inlet at an upstream end configured for connection to the first combustion chamber and an outlet at a downstream end configured for connection to the second burner;a first combustion chamber cooling zone with a first cooling channel which is delimited by a first combustion chamber wall and a first jacket, which encloses the first combustion chamber wall;a mixer cooling zone with a second cooling channel which is delimited by a mixer wall and a second jacket, which encloses the mixer wall;a second burner cooling zone with a third cooling channel which is delimited by a second burner wall and a third jacket, which encloses the second burner wall; anda second combustion chamber cooling zone, with a fourth cooling channel which is delimited by a second combustion chamber wall and a fourth jacket, which encloses the second combustion chamber wall, the first, second, third, and fourth cooling channels being arranged such that a cooling gas will flow through the cooling channels during operation;the first cooling channel configured to receive the cooling gas such that: a first portion of the cooling gas is passed through the first cooling channel to the first burner such that the first portion of the cooling gas flows in a direction that is counterflow to a main flow direction of hot gas flowing through the first combustion chamber, anda second portion of the cooling gas is passed through the first cooling channel toward the second cooling channel in a direction that is co-current with the main flow direction of the hot gas flowing through the first combustion chamber. 2. The sequential combustor arrangement as claimed in claim 1, wherein the second cooling channel is connected to the first cooling channel so that the second portion of the cooling gas is usable for cooling in the second cooling channel during operation. 3. The sequential combustor arrangement as claimed in claim 1, wherein the at least two of the first cooling channel, the second cooling channel, the third cooling channel, and the fourth cooling channel are directly connected to a compressor such that compressed gas leaving the compressor will be admitted directly to the at least two cooling channels without prior heat pick up in an interposed cooling zone. 4. The sequential combustor arrangement as claimed in claim 1, wherein the dilution gas inlet is fluidly connected to an outlet of the second cooling channel such that at least part of the second portion of the cooling gas used for cooling in the second cooling channel will be admixed to the hot gases in the mixer during operation. 5. The sequential combustor arrangement as claimed in claim 1, wherein the second cooling channel is fluidly connected to the hot gas flow path of the second burner upstream of the second fuel gas injection such that during operation at least part of the second portion of the cooling gas will be fed into the second burner upstream of the second fuel injection after flowing through at least part of the second cooling cannel. 6. The sequential combustor arrangement as claimed in claim 1, wherein the first burner is fluidly connected to an outlet of the first cooling channel such that at least part of the first portion of the cooling gas will be fed into the first burner after flowing through at least part of the first cooling channel during operation. 7. The sequential combustor arrangement as claimed in claim 1, wherein at least one cooling channel has an inlet at a downstream end with respect to a flow direction of hot gas and an outlet opening at an upstream end with respect to the flow direction of the hot gas. 8. The sequential combustor arrangement as claimed in claim 1, wherein the dilution gas inlet is in fluid communication with the second cooling channel between the downstream end of the duct of the mixer and the upstream end of the duct of the mixer. 9. The sequential combustor arrangement as claimed in claim 1, wherein an outlet of the first cooling channel is fluidly connected to the first burner such that at least part of the first portion of the cooling gas will be introduced into the first combustion chamber via the first burner after passing through the first cooling channel. 10. A method for operating a gas turbine with at least a compressor, a sequential combustor arrangement having a first burner, a first combustion chamber, a mixer for admixing a dilution gas to hot gases leaving the first combustion chamber, a second burner, and a second combustion chamber arranged sequentially in a fluid flow connection, the method comprising: guiding, via the mixer, combustion gases in a hot gas flow path extending between the first combustion chamber and the second burner via a duct having an inlet at an upstream end configured for connection to the first combustion chamber and an outlet at a downstream end configured for connection to the second burner,the sequential combustor arrangement including a first combustion chamber cooling zone with a first cooling channel which is delimited by a first combustion chamber wall and a first jacket, which encloses the first combustion chamber wall, a mixer cooling zone with a second cooling channel which is delimited by a mixer wall and a second jacket, which encloses the mixer wall, a second burner cooling zone with a third cooling channel which is delimited by a second burner wall and a third jacket, which encloses the second burner wall, and a second combustion chamber cooling zone, with a fourth cooling channel which is delimited by a second combustion chamber wall and a fourth jacket, which encloses the second combustion chamber wall, the method comprising:feeding and guiding a cooling gas through the cooling channels such that: a first portion of the cooling gas is passed through the first cooling channel to the first burner such that the first portion of the cooling gas flows in a direction that is counterflow to a main flow direction of hot gas flowing through the first combustion chamber, anda second portion of the cooling gas is passed through the first cooling channel toward the second cooling channel in a direction that is co-current with the main flow direction of the hot gas flowing through the first combustion chamber; andadmixing a dilution gas the hot gas leaving the first combustion chamber. 11. The method as claimed in claim 10, wherein the second portion of the cooling gas is passed through the second cooling channel parallel to the main flow direction of the hot gas. 12. The method of claim 10, comprising: feeding the cooling gas from a compressor to the first cooling channel. 13. The method of claim 10, wherein at least two of the first cooling channel, the second cooling channel, the third cooling channel, and the fourth cooling channel are directly connected to a compressor such that compressed gas leaving the compressor will be admitted directly to these cooling channels without prior heat pick up in an interposed cooling zone.