What is the stoichiometric air/fuel ratio?
What is the stoichiometric air/fuel ratio?
about 14.7:1
The theoretical air–fuel ratio mixture for a gasoline fueled engine, for complete gasoline fuel combustion, the stoichiometric air–fuel ratio is about 14.7:1. In order to completely burn 1 kg of gasoline fuel, the combustion process needs 14.7 kg of air.
What is the stoichiometric ratio for propane?
15.67 : 1 23.9 : 1
Stoichiometric air-to-fuel ratios of common fuels
| Fuel | Ratio by mass | Ratio by volume |
|---|---|---|
| Gasoline | 14.7 : 1 | — |
| Natural gas | 17.2 : 1 | 9.7 : 1 |
| Propane (LP) | 15.67 : 1 | 23.9 : 1 |
| Ethanol | 9 : 1 | — |
How is stoichiometric air calculated?
Calculating the Ratio
- So 1 molecule of methane has a molecular weight of: 1 * 12.01 + 4 * 1.008 = 16.042.
- One oxygen molecule weighs: 2 * 16 = 32.
- The oxygen-fuel mass ratio is then: 2 * 32 / 1 * 16.042 = 64 / 16.042.
- So we need 3.99 kg of oxygen for every 1 kg of fuel.
What is the stoichiometric ratio for diesel?
Stoichiometric air fuel ratio for different fuels:
| Fuels | Stoichiometric air-fuel ratio |
|---|---|
| Methane | 17 |
| Methanol | 6.5:1 |
| Diesel | 14.5:1 |
| Ethanol | 9:1 |
What is the best fuel to air ratio for propane?
In con- trast, no problem is encountered with propane or natural gas operating at 1.45 air-fuel equivalence ratio—a value that results in low levels of both HC and NOr Thus, the permissible lean limit appears to be highly significant in fuel evaluation for low emissions.
What is stoichiometry air?
Theoretical (Stoichiometric) Air The minimum amount of air needed for the complete combustion of a fuel is called the stoichiometric or theoretical air. A combustion process is complete if all the carbon in the fuel burns to CO2, all the hydrogen burns to H2O, and all the sulfur (if any) burns to SO2.
What is the stoichiometric ratio of methane?
For example, in the combustion of methane (CH4), equation 1, the stoichiometric ratios are 1:2:1:2, methane to oxygen to carbon dioxide to water, respectively.
Which fuel requires lowest amount of excess air for combustion?
Natural gas requires much less air in combustion because of its relatively low amounts of carbon and high amounts of hydrogen. The burning of natural gas is cleaner than the burning of oil and coal.
