Hi friends;

If i know the differential air pressure, CDP (Compressor discharge presure), Compressor discharge temperature.

How can i calculate the mass air flow in PPS of the gas turbine
Regards

 

Any one help me on this issue?

> If i know the differential air pressure, CDP (Compressor discharge pressure), Compressor discharge temperature.

> How can i calculate the mass air flow in PPS of the gas turbine

 

You don't say what differential air pressure you know. But maybe it doesn't matter, because I don't think you have enough parameters. I don't know what gas turbine you have, but I can tell you that when GE has a requirement to provide the airflow measurement they include a special set of sensors that include:

1. ambient air pressure
2. inlet filter differential pressure
3. compressor bellmouth differential pressure
4. compressor inlet temperature (RTD)
5. exhaust backpressure.

In addition, the compressor discharge pressure and temperature are used in the calculation, along with a "fudge factor" for the compressor inlet that is determined during factory test of the turbine.

If you have a GE gas turbine, you would need to contact GE to have the air flow calculation added to the control. But, if you do have a GE unit and it has DLN2 gas fuel system, the air flow calculation should be in the GE control already.

 

Here is the data for W251B11 westinghouse gas turbine 50MW.
we have all these parameters but no idea to calculate the mass flow...
and we need it very much because we have lesser output from our 2nd turbine which has the same characteristics,same design but 2MW lesser.
so by knowing massflow we might able to confirm that this is compressor problem as mass flow is reduced.

because in compressor efficiency calculations we have 2% less efficiency also even after offline washing on same date.please help me in this regard.

1. ambient air pressure = 985 mBar
2. inlet filter differential pressure = 2.5 in.WC
3. compressor bellmouth differential pressure = 89 in.WC
4. compressor inlet temperature (RTD)= 74.6F
5. exhaust backpressure. = 6.0 in.WC
6. Compressor discharge pressure = 212PSI
7. Compressor discharge temperature = 806.1F

 

I also need the answer of this example given by Jamal. Please help us.
Thanks

> Here is the data for W251B11 westinghouse gas turbine 50MW.

> 1. ambient air pressure = 985 mBar
> 2. inlet filter differential pressure = 2.5 in.WC
> 3. compressor bellmouth differential pressure = 89 in.WC
> 4. compressor inlet temperature (RTD) = 74.6F
> 5. exhaust backpressure. = 6.0 in.WC
> 6. Compressor discharge pressure = 212PSI
> 7. Compressor discharge temperature = 806.1F