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Adiabatic Flame Temperatures

Adiabatic flame temperatures for hydrogen, methane, propane and octane - in Kelvin.

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

Adiabatic flame temperatures for hydrogen, methane, propane and octane - and others - with oxygen or air as oxidizers in a constant pressure adiabatic reaction:

Fuels - Flame Temperatures
FuelAdiabatic Flame Temperature
(K)
Oxygen*)
as Oxidizer
Air
as Oxidizer
Acetaldehyde 3817 2228
Acetone 3705 2253
Acetylene - C2H2 4)
3997 2607
Benzene - C6 H63) 3784 2363
n-Butane - C4 H101) 3867 2248
iso-Butane - C4 H101) 3861 2246
Butylene - C4 H82) 3867 2494
Carbin disulfide 2257
Cyanogen 4855 2596
Cyclohexane 3865 2250
Cyclopropane 3904 2370
Decane 3833 2286
Ethane - C2H61) 3903 2222
Ethanol 3730 2238
Ethylene - C2H42) 3932 2375
Hexane 3855 2238
Hydrogen - H2 3473 2483
Methane - CH41) 3953 2236
Methanol 3656 2222
Neopentane - C5 H121) 3850 2511
n-Hexane - C10 H81) 3682 2494
Naphthalene - C6 H144) 3943 2533
Neohexane - C6 H141) 3838 2508
n-Heptane - C7 H161) 3851 2469
Oxirane 3796 2177
n-Pentane - C5 H121) 3848 2505
iso-Pentane - C5 H121) 3857 2508
n-Pentene - C5 H102) 3865 2569
Propane - C3 H81) 2526 2250
Propylene- C3 H62) 3902 2528
Toluene - C7 H83) 3786 2344
Triptane - C7 H161) 3836 2497
p-Xylene - C8 H103) 3788 2483

*) Thanks to Maxwell Pisciotta for the calculating of adiabatic flame temperatures with oxygen as oxidizer

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

  • reactants enter the combustion process at 25 oC (77 oF) 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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