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  • HFO to natural gas

    What is the natural gas mmbtu equivalent of 40000 m3 of HFO based on
    .natural gas calorific value = 8250 kcal/kg

  • #2
    Originally posted by Turnkeydr View Post
    What is the natural gas mmbtu equivalent of 40000 m3 of HFO based on
    .natural gas calorific value = 8250 kcal/kg
    This problem is a bit of units mess, mixing SI and Imperial units, using the deprecated calorie, etc. I am using this page for heating values and conversions. Note that densities and heating values for products that are a mixture of different components may vary. https://www.engineeringtoolbox.com/f...ues-d_169.html

    You do not specify whether the heating value for natural gas is higher or lower heating value. Higher assumes exhaust temperature is low enough to usefully recover the heat of vaporization of the water produced by combustion (rarely true). Lower heating value assumes it isn't. However, fuel suppliers almost always give HHV.

    Heavy Fuel Oil Density 0.98 kg/L, HHV 41.8 MJ/kg
    40000 m x 1000 L/m x 0.98 kg/L x 41.8 MJ/kg = 1.64 PJ

    Natural gas: Note that your heating value is quite low compared to the typical given in the table
    8250 kcal/kg x 4.1868 kJ/kcal = 34.54 MJ/kg
    1.64 PJ x 1 kg/34.54 MJ = 47438 t of natural gas, compared to 39.2 t HFO. This is due to the rather low heating value of your natural gas supply.
    (Note t is metric ton or tonne)

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