Adiabatic Flame Temperatures
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:
| Fuel | Adiabatic Flame Temperature ( K ) | |
|---|---|---|
| Oxygen *) as Oxidizer | Air as Oxidizer | |
| Acetaldehyde | 3817 | 2228 |
| Acetone | 3705 | 2253 |
| Acetylene - C2H2 4) |
3997 | 2607 |
| Benzene - C6 H 6 3) | 3784 | 2363 |
| n-Butane - C 4 H 10 1) | 3867 | 2248 |
| iso-Butane - C 4 H 10 1) | 3861 | 2246 |
| Butylene - C 4 H 8 2) | 3867 | 2494 |
| Carbin disulfide | 2257 | |
| Cyanogen | 4855 | 2596 |
| Cyclohexane | 3865 | 2250 |
| Cyclopropane | 3904 | 2370 |
| Decane | 3833 | 2286 |
| Ethane - C2H 6 1) | 3903 | 2222 |
| Ethanol | 3730 | 2238 |
| Ethylene - C2H 4 2) | 3932 | 2375 |
| Hexane | 3855 | 2238 |
| Hydrogen - H2 | 3473 | 2483 |
| Methane - CH 4 1) | 3953 | 2236 |
| Methanol | 3656 | 2222 |
| Neopentane - C5 H 12 1) | 3850 | 2511 |
| n-Hexane - C 10 H 8 1) | 3682 | 2494 |
| Naphthalene - C6 H 14 4) | 3943 | 2533 |
| Neohexane - C6 H 14 1) | 3838 | 2508 |
| n-Heptane - C 7 H 16 1) | 3851 | 2469 |
| Oxirane | 3796 | 2177 |
| n-Pentane - C5 H 12 1) | 3848 | 2505 |
| iso-Pentane - C5 H 12 1) | 3857 | 2508 |
| n-Pentene - C5 H 10 2) | 3865 | 2569 |
| Propane - C3 H 8 1) | 2526 | 2250 |
| Propylene- C3 H 6 2) | 3902 | 2528 |
| Toluene - C 7 H 8 3) | 3786 | 2344 |
| Triptane - C 7 H 16 1) | 3836 | 2497 |
| p-Xylene - C 8 H 10 3) | 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.
Related Topics
• Combustion
Combustion processes and their efficiency. Boiler house and chimney topics. Properties of fuels like oil, gas, coal and wood and more. Safety valves and tanks.
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