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In a GE Frame 9 Gas turbine, what percentage of rated load fuel consumption do we expect to flow at full speed no load? Someone told me it is more than 25%. Can that be true?
Every GE-design heavy duty gas turbine is provided with a document called the Control Specification.
That document, in Section 5, should have a paragraph for each fuel titled 'Expected Fuel Characteristics' or something similar. That section should have a table which lists expected fuel flow characteristics for firing, FSNL, 25-, 50-, 75- and 100% load.
Remember, for a combustion turbine producing <b>rated</b> power approximately two of every three horsepower produced by the turbine is used to drive the axial compressor (that's a rough estimate but not too far off for a simple cycle turbine; some turbines are more efficient than others in simple cycle mode). The axial compressor consumes a lot of power, at any speed.
But the Control Spec should provide you a rough estimate of the fuel flow-rates, from which you can answer your question.
Lastly, you asked about a GE Frame 9 gas turbine. There are Frame 9Es, Frame 9Fs, Frame 9FAs, Frame 9FA+, Frame 9FA+e, and Frame 9FB machines. Perhaps if you were more specific, someone could look at their Control Spec and provide some additional information that might be helpful
That document, in Section 5, should have a paragraph for each fuel titled 'Expected Fuel Characteristics' or something similar. That section should have a table which lists expected fuel flow characteristics for firing, FSNL, 25-, 50-, 75- and 100% load.
Remember, for a combustion turbine producing <b>rated</b> power approximately two of every three horsepower produced by the turbine is used to drive the axial compressor (that's a rough estimate but not too far off for a simple cycle turbine; some turbines are more efficient than others in simple cycle mode). The axial compressor consumes a lot of power, at any speed.
But the Control Spec should provide you a rough estimate of the fuel flow-rates, from which you can answer your question.
Lastly, you asked about a GE Frame 9 gas turbine. There are Frame 9Es, Frame 9Fs, Frame 9FAs, Frame 9FA+, Frame 9FA+e, and Frame 9FB machines. Perhaps if you were more specific, someone could look at their Control Spec and provide some additional information that might be helpful
N
Namatimangan08
At full load only around 30% of heat input to GT is converted to electricity. We have around 5% mechanical + electrical loss, around 20% compression & expansion losses. What left then? 55% right? So where is the remaining 55% has gone? The remaining percentage is actually work done by compressor. So at full speed no load your GT is still need a lot of power to run the compressor. Thus it needs a lot of fuel too.
3
309EGuy
Sounds fair to me.
I recall some actual figures of 1.8kg/s for FSNL flow, and around 7-7.3kg/s at base load. This is for gas fueled 9E units.
I have detailed files.
I recall some actual figures of 1.8kg/s for FSNL flow, and around 7-7.3kg/s at base load. This is for gas fueled 9E units.
I have detailed files.
B
Bob Johnston
I don't have any exact numbers for a Frame 9 but most GE industrials are about the same. For a Frame 6, FSNL fuel flow is about 30% of Base Load. Remember Load or not, the turbine H.P. has to run the turbine air compressor and therefore a lot of fuel is required, even at FSNL to produce this H.P.
