we have 3 GE Gas Turbine generator, Frame 5, the properties of Fuel gas composition that issue by GE is as below(mole):

Methane: min=85 max=100
Ethane: min=0 max=15
propane: min=0 max=15
...

our fuel gas composition is:
Methane = 99.4%
Ethane = 0.6%

now we want to use the fuel with Methane=60% and
Ethane =40%.

1- Can we use fuel with this composition?

2- What is the effect of this change on the performance of Gas Turbine?

any help will be appreciated
thanks,
shakarami

 

shakarami,

You should contact the gas turbine supplier (GE). I cannot tell you the impact. It is a fuel that can be used, but you may well need modifications. It could require new gas fuel nozzles. It will very likely require new control constants.

You should provide a detailed gas analysis to GE if you have it (to save time, because they will ask for it).

 

Ali Shakarami,

You should have a heat content value (LHV) for the new fuel that you can compare to the heat content of the existing fuel supply. That would be the best indication of how much more--or less--fuel flow you will need to maintain rated load.

otised is right, though; you should contact the turbine manufacturer or a knowledgeable engineering person or firm who can analyze the turbine at your site and its configuration (type of combustion system; size of fuel nozzle orifices; fuel control valve trim; fuel supply pressure and flow-rate; etc.) and give you a proper answer after you've supplied the pertinent data.

There are too many variables for us to give you a better answer without knowing a lot more information--and you're going to have to provide this information to someone at some point if you are really serious about changing fuels.

Please write back to let us know how this project progresses.