Gas Turbine Generator Fuel Consumption

Quantity of fuel used divided by time to burn.

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

290 ~ 300 m3/hr per MW

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

450.0 m3/hr per MW

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

Regards,
Sapper

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.

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.

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.

Regards,
Sapper.

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??????????

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)

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.

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?

What is the calorific value of the gas?