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Adiabatic Flame Temperatures

Adiabatic flame temperature hydrogen, methane, propane and octane - in Kelvin

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A combustion process without heat loss or gain is called adiabatic.

Adiabatic flame temperatures for some common fuel gases like hydrogen, methane, propane and octane - with oxygen or air as oxidizers in a constant pressure adiabatic reaction - are indicated below:

FuelAdiabatic Flame Temperature
(K)
Oxygen
as Oxidizer
Air
as Oxidizer
Acetylene - C2H2  4)
2905
Benzene - C6H6  3) 2539
n-Butane - C4H10  1) 2246
iso-Butane - C4H10  1) 2246
Butylene - C4H8  2) 2494
Ethane - C2H6  1) 2222
Ethylene - C2H4  2) 2616
Hydrogen - H2 3473 2483
Methane - CH4  1) 2223
Neopentane - C5H12  1) 2511
n-Hexane - C10H8  1) 2494
Naphthalene - C6H14  4) 2533
Neohexane - C6H14  1) 2508
n-Heptane - C7H16  1) 2469
n-Pentane -C5H12 1) 2505
iso-Pentane - C5H12 1) 2508
n-Pentene - C5H10  2) 2569
Propane - C3H8  1) 2526 1967
Propylene- C3H6  2) 2528
Toluene - C7H8  3) 2505
Triptane - C7H16  1) 2497
p-Xylene - C8H10  3) 2483

1) Paraffins or alkanes
2) Olefins or alkenes
3) Aromatics
4) Other hydrocarbons

  • reactants enter the combustion process at 25oC (77oF) and 1 atm pressure
  • products leaves the process at 1 atm pressure
  • combustion is stoichiometric without any excess air

Excess air will reduce the adiabatic flame temperature and is often introduced to avoid flame temperatures exceeding limits sets by the materials in the combustion system.

Methane is the major part in Natural gas. 

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