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Common fuels
When the composition of a fuel is known, this method can be used to derive the stoichiometric air-fuel ratio. For the most common fuels, this, however, is not necessary because the ratios are known:
Gasoline: 14.7
Natural gas: 17.2
Propane: 15.5
Ethanol: 9
Methanol: 6.4
Diesel: 14.6
What else can I help you with?
What is the air to fuel ratio for LPG?
The ideal air to fuel ratio for LPG (liquefied petroleum gas) combustion is typically around 25:1 by mass. This means 25 parts of air to 1 part of LPG for complete combustion. Adjustments may be needed based on specific engine requirements to achieve optimal performance and efficiency.
What is the optimum ratio of air to ethyne for complete combustion?
The properly balanced combustion reaction is given by (don't care about N2 on the product side) C2H2 + 5/2 (O2 + 3.75N2) -> 2CO2 + H2O + N2 So, the molar air to fuel ratio for complete combustion is 2/5.
Why is stoichiometric combustion rare?
Stoichiometric combustion is almost never possible because of imperfect fuel-air mixing. For economy and safety, most combustion equipment (such as heaters, furnaces, and engines) should operate with excess air to ensure that fuel is not wasted and that combustion is complete
How does heat combustion of paraffin compare to heat combustion of propane?
The heat combustion of paraffin produces less heat energy compared to propane because propane has a higher energy content per unit mass. Propane releases more energy per carbon atom compared to paraffin during combustion, making it a more efficient fuel for heating. Additionally, propane burns cleaner with lower emissions compared to paraffin.
What substance's complete combustion produces carbon dioxide and water?
candle wax. The wax is a hydrocarbon (hydrogen+carbon) and as it burns, it rects with oxygen and hydrogen in the air. Hydrogen+hydrogen+oxygen=H2O (water) Carbon+oxygen+oxygen=CO2 (carbon dioxide) Other hydrocarbons include petrol, diesel, oil, propane etc
What is the air to fuel ratio for LPG?
The ideal air to fuel ratio for LPG (liquefied petroleum gas) combustion is typically around 25:1 by mass. This means 25 parts of air to 1 part of LPG for complete combustion. Adjustments may be needed based on specific engine requirements to achieve optimal performance and efficiency.
What color should the flame of propane be to show complete combustion?
The flame of propane should be blue in color to indicate complete combustion. A blue flame indicates that the fuel is burning efficiently and producing less soot and harmful byproducts compared to a yellow or orange flame.
What is the optimum ratio of air to ethyne for complete combustion?
The properly balanced combustion reaction is given by (don't care about N2 on the product side) C2H2 + 5/2 (O2 + 3.75N2) -> 2CO2 + H2O + N2 So, the molar air to fuel ratio for complete combustion is 2/5.
What is the reactant of a complete combustion?
Oxygen + organic molecule -------> carbon dioxide + water
Why is stoichiometric combustion rare?
Stoichiometric combustion is almost never possible because of imperfect fuel-air mixing. For economy and safety, most combustion equipment (such as heaters, furnaces, and engines) should operate with excess air to ensure that fuel is not wasted and that combustion is complete
Is propane an oxidizing agent?
No it is not. Propane can be used as fuel during oxidation reaction however it is not an oxidizing agent. In a redox reaction such as combustion, propane acts as a reducing agent. Common agents are O2 and O3.
How is fuel air ratio calculated?
The fuel-air ratio (F/A ratio) is calculated by dividing the mass of fuel by the mass of air in a combustion process. It can be expressed as F/A = (mass of fuel) / (mass of air). To determine this ratio, you can use the specific fuel's energy content and the stoichiometric coefficients for the combustion reaction. This ratio is crucial for optimizing combustion efficiency and reducing emissions in engines and burners.
What does AFR 14k mean?
AFR 14k refers to an air-fuel ratio (AFR) of 14 parts air to 1 part fuel by weight, which is considered the ideal stoichiometric ratio for gasoline combustion in internal combustion engines. This ratio ensures complete combustion, maximizing efficiency and minimizing emissions. Deviations from this ratio can lead to rich (too much fuel) or lean (too much air) conditions, impacting performance and engine health.
How does heat combustion of paraffin compare to heat combustion of propane?
The heat combustion of paraffin produces less heat energy compared to propane because propane has a higher energy content per unit mass. Propane releases more energy per carbon atom compared to paraffin during combustion, making it a more efficient fuel for heating. Additionally, propane burns cleaner with lower emissions compared to paraffin.
How is fuel air ratio measured?
The fuel-air ratio is measured by comparing the mass or volume of fuel to the mass or volume of air present in a combustion process. This is typically expressed as a ratio, such as 14.7:1 for stoichiometric combustion of gasoline, indicating the ideal proportion for complete combustion. Instruments like mass flow meters, lambda sensors, or fuel flow sensors are used to obtain accurate measurements of both fuel and air. The ratio can also be calculated using engine management systems that monitor engine parameters in real-time.
What is injection ratio?
Injection ratio refers to the proportion of fuel injected into an engine's combustion chamber compared to the air or total mixture during the combustion process. It is a critical parameter in determining engine efficiency, performance, and emissions. A well-optimized injection ratio ensures complete combustion, enhancing power output while minimizing pollutants. Adjustments to this ratio can significantly impact engine operation, fuel economy, and overall performance.
What ratio of air-fuel is called lean?
A lean air-fuel mixture refers to a ratio in which there is more air than fuel, typically having an air-to-fuel ratio greater than 14.7:1 by weight for gasoline engines. This means that there is less fuel relative to the amount of air, which can lead to more complete combustion and improved fuel efficiency, but may also cause higher combustion temperatures and potential engine knock if excessively lean.
