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 - C 2 H 2 4) | 3997 | 2607 |
| Benzene - C 6 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 - C 2 H 6 1) | 3903 | 2222 |
| Ethanol | 3730 | 2238 |
| Ethylene - C 2 H 4 2) | 3932 | 2375 |
| Hexane | 3855 | 2238 |
| Hydrogen - H 2 | 3473 | 2483 |
| Methane - CH 4 1) | 3953 | 2236 |
| Methanol | 3656 | 2222 |
| Neopentane - C 5 H 12 1) | 3850 | 2511 |
| n-Hexane - C 10 H 8 1) | 3682 | 2494 |
| Naphthalene - C 6 H 14 4) | 3943 | 2533 |
| Neohexane - C 6 H 14 1) | 3838 | 2508 |
| n-Heptane - C 7 H 16 1) | 3851 | 2469 |
| Oxirane | 3796 | 2177 |
| n-Pentane - C 5 H 12 1) | 3848 | 2505 |
| iso-Pentane - C 5 H 12 1) | 3857 | 2508 |
| n-Pentene - C 5 H 10 2) | 3865 | 2569 |
| Propane - C 3 H 8 1) | 2526 | 2250 |
| Propylene- C 3 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 o C (77 o F) 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
Boiler house topics, fuels like oil, gas, coal, wood - chimneys, safety valves, tanks - combustion efficiency.
Related Documents
2nd Law of Thermodynamics
Entropy and disorder.
Ethane - Density and Specific Weight vs. Temperature and Pressure
Online calculator, figures and tables showing density and specific weight of ethane, C2H6, at varying temperature and pressure - Imperial and SI Units.
Fuel Gases - Flame Temperatures
Adiabatic flame temperatures for common fuel gases - propane, butane, acetylene and more - in air or oxygen atmospheres.
Propane - Thermophysical properties
Chemical, physical and thermal properties of propane gas - C3H8.
Propane - Vapor Pressure vs. Temperature
Vapor pressure vs. temperature.
Steam Entropy
Basic steam thermodynamics - entropy diagram.