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Gas Turbine Generator Fuel Consumption

11/20/2011 5:52 AM

Dears;

I would like to request your kind help, I need the formula for fuel consumption?

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#1

Re: Gas Turbine Generator fuel consumption

11/20/2011 5:58 AM

Quantity of fuel used divided by time to burn.

Contact the turbine manufacturer for a theoretical calculation of fuel consumption of a particular turbine.

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#2

Re: Gas Turbine Generator Fuel Consumption

11/20/2011 10:00 AM

290 ~ 300 m3/hr per MW

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#3
In reply to #2

Re: Gas Turbine Generator Fuel Consumption

11/20/2011 10:08 AM

Sorry that was Gas Engines (Caterpillar/GE etc) . Gas Turbines are 450.0 m3/hr (GE/Fiat Avio etc)

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#4
In reply to #3

Re: Gas Turbine Generator Fuel Consumption

11/20/2011 10:09 AM

450.0 m3/hr per MW

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#5

Re: Gas Turbine Generator Fuel Consumption

11/20/2011 4:39 PM

Ummm....How big is the Turbine???

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Sapper

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#6
In reply to #5

Re: Gas Turbine Generator Fuel Consumption

11/20/2011 10:37 PM

Thats an average gas consumption m3/mw given by Manufacturers irrespective the size. If you have a 4.0 Mw x 450 = 1800.0 m3/hr gas consumption = 0.45 m3/kw.

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#7
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Re: Gas Turbine Generator Fuel Consumption

11/20/2011 10:41 PM

Sapper I am not electrical but utility and mechanical. Please correct me if the flow m3/hr has to do something with the Mw generated or the gas flow m3/hr per mw increases with each bigger size of gas engines/ gas turbine.

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#10
In reply to #7

Re: Gas Turbine Generator Fuel Consumption

11/20/2011 11:31 PM

Ducon,

I replied to the thread....not your post.. I hadn't got that far..

However, turbine size, Gas type, pressure and loading will all impact burn rate, efficiency and therfore consumption per Mwh.

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#11
In reply to #10

Re: Gas Turbine Generator Fuel Consumption

11/20/2011 11:45 PM

No problem. Check my reply to Sv below and my calculation. Now based on that the only flow difference m3/hr per mw will come due change in gas calorific value. This will be +/- 280.0 m3/hr per mw. This matches with the gas engine stated at 290.0 m3/hr BUT on Turbines they are stating 450.0 m3/hr and now I am getting confused because it is 10 Gj/mw so why will it shoot from 280.0 m3/hr to 450.0 m3/hr??????????

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#8

Re: Gas Turbine Generator Fuel Consumption

11/20/2011 10:53 PM

Depends on gas turbine size, ambient conditions etc.

Generally at ISO you can expect around 10 GJ/MWh. So if your generator rated output is say 50 MW then,

Fuel consumption = 10 GJ/MWh x 50 MW = 500 GJ/h (circa 140,000 kW)

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#9
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Re: Gas Turbine Generator Fuel Consumption

11/20/2011 11:22 PM

10 Gj = 2,388,459 Kcal = 2.33 Mkcal. So 2,388,459 kcal/8,500 kcal (calorific value of natural gas) = 280.0 m3/hr gas required per each Mw.

50 mw = 500 Gj x 2,388,459 = 119,422,950.0 kcal/8500 = 14049.8 = 14,050.0 m3/hr per 50 mw

The flow 280.0 m3/hr per mw remains same then for any size if gas at 8500 kcal calorific value (change in different temperatures will change m3/hr gas flow per mw).

The name of the game then is the selling edge of whosoever manufacturers sets the minimum limit m3/hr per mw. Like GE gas Engines 290.0 m3/hr per MW s others 300 t0 330 m3/hr per Mw. The figure 450.0 m3/hr per mw on gas turbines is what given by the 2 manufacturers i mentioned.

Please check and correct me.

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#12

Re: Gas Turbine Generator Fuel Consumption

11/21/2011 12:16 AM

Really. To answer your question exactly as stated in US units, gallons divided by hours equals gallons per hour. Often expressed as gph. Now what are you really after?

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#13

Re: Gas Turbine Generator Fuel Consumption

11/21/2011 3:33 AM

What is the calorific value of the gas?

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#14
In reply to #13

Re: Gas Turbine Generator Fuel Consumption

11/21/2011 7:25 AM

Dears;

we are calculating the fuel consumption as follows

(total generation times factor) divided by 24hr. the answer will be in MMSCF

my question is the above farmual right or wrong?

this which i am looking for.

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#15
In reply to #14

Re: Gas Turbine Generator Fuel Consumption

11/21/2011 8:46 AM

We need to know the efficiency of the system. If my memory isnt' too bad today, an engine or turbine generator is around 30% to 40% at converting fuel energy to electrical energy. Your number might be a bit different.

If you generate 1000 watts, you will need to burn 2500 watts of fuel at 40% efficiency and 3333 watts of fuel at 30% efficiency.

I will leave the hard work of converting required watts of fuel to gallons or SCF units to more energetic minds that actually know the actual values based on fuels being currently utilized.

If I understand your question, you want the "factor" to multiply against the total generation. That is based on actual efficiency of your equipment, and the heat content (LHV or HHV) of a unit of fuel.

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