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In f-series machine, how we are extending the premix mode operation range with the help of inlet bleed heat control?
Vinu,
You have a lot of theoretical questions.
Most of the F-class machines I have worked with have second generation DLN combustors which operate mainly in premix mode at all times. There is a small diffusion flame on each nozzle, but the majority of the fuel passes through orifices which put the fuel in a very air-rich mixture, premixing it.
Inlet bleed heat is used to allow the compressor inlet guide vanes to be closed less than would otherwise be possible without inducing compressor surge or stall.
It's my understanding that F-class machines with DLN combustors must have inlet bleed heating; that is, it's required for F-class machines with DLN combustors.
B/E-class machines with DLN combustors do not require inlet bleed heat, but it can be used to extend the premix operating mode, which is typically only 80-100% of rated load. Inlet bleed heat, if installed on a B/E-class machine with DLN combustors will allow premix mode operation down to approximately 40% of rated load by allowing the axial compressor inlet guide vanes to be closed below the normal design minimum operating limit.
So, I don't think inlet bleed heat is used for extending premix operation on F-class machines in the same way it's used on B/E-class machines. B/E class machines have different DLN combustors which don't operate in premix mode at all times.
Hope this helps.
You have a lot of theoretical questions.
Most of the F-class machines I have worked with have second generation DLN combustors which operate mainly in premix mode at all times. There is a small diffusion flame on each nozzle, but the majority of the fuel passes through orifices which put the fuel in a very air-rich mixture, premixing it.
Inlet bleed heat is used to allow the compressor inlet guide vanes to be closed less than would otherwise be possible without inducing compressor surge or stall.
It's my understanding that F-class machines with DLN combustors must have inlet bleed heating; that is, it's required for F-class machines with DLN combustors.
B/E-class machines with DLN combustors do not require inlet bleed heat, but it can be used to extend the premix operating mode, which is typically only 80-100% of rated load. Inlet bleed heat, if installed on a B/E-class machine with DLN combustors will allow premix mode operation down to approximately 40% of rated load by allowing the axial compressor inlet guide vanes to be closed below the normal design minimum operating limit.
So, I don't think inlet bleed heat is used for extending premix operation on F-class machines in the same way it's used on B/E-class machines. B/E class machines have different DLN combustors which don't operate in premix mode at all times.
Hope this helps.
B
Bob Johnston
> In f-series machine, how we are extending the premix mode operation
> range with the help of inlet bleed heat control?
Vinu, send me an Email to [email protected]. I have document which explains IBH vs DLN control which should help you
> range with the help of inlet bleed heat control?
Vinu, send me an Email to [email protected]. I have document which explains IBH vs DLN control which should help you
D
Debashish Das
> Vinu, send me an Email to [email protected]. I have document
> which explains IBH vs DLN control which should help you
Sir, can you pl send me the doc to [email protected] along with vinu.
> which explains IBH vs DLN control which should help you
Sir, can you pl send me the doc to [email protected] along with vinu.
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