Composition of fuel, AFR , & of air

[zainulariffin]

Homework Statement

hi guys, i have problem regarding this matters.

Products : hydrocarbon

if i have this :

CO2 - 80%
CO - 0.9%
O2 - 8.8%
N2 - 82.3%

1) how to determine the composition of the fuel?

2) the air fuel ratio?
known , the air fuel ratio is : mass of air / mass of fuel

how can i get the mass base on the given data?

3) the percentage of excess air used.

please help advice to settle this problem.

regards,

zainul

 

[chemisttree]

Homework Statement

hi guys, i have problem regarding this matters.

Products : hydrocarbon

if i have this :

CO2 - 80%
CO - 0.9%
O2 - 8.8%
N2 - 82.3%

1) how to determine the composition of the fuel?

2) the air fuel ratio?
known , the air fuel ratio is : mass of air / mass of fuel

how can i get the mass base on the given data?

3) the percentage of excess air used.

please help advice to settle this problem.

regards,

zainul

So you have a gas mixture composed of 80% CO2 and 82.3% N2?

Nonsense! Think about it some more and get back to us...

 

[zainulariffin]

sorry, typo error..

CO2 - 8.0%

 

[Borek]

Products : hydrocarbon

if i have this :

CO2 - 80%
CO - 0.9%
O2 - 8.8%
N2 - 82.3%

No idea what the question is. Please don't ignore homework template - it requires you to post the question verbatim, not just some subset of the information.

You mentioned hydrocarbon, so regardless of what the gas mentioned is I would expect it to contain water - but it is not listed.

 

[DeeNos]

I would suggest starting by reviewing the basic principles of combustion and fuel composition. In order to determine the composition of the fuel, you will need to know the type of hydrocarbon present and its molar mass. From there, you can calculate the mass of each component in the fuel based on the given percentages. It may also be helpful to consider the ideal gas law and the concept of stoichiometry.

To determine the air fuel ratio, you can use the given formula of mass of air / mass of fuel. Again, you will need to know the molar mass of the hydrocarbon in order to calculate the mass of fuel.

As for the percentage of excess air used, this will depend on the desired combustion efficiency. Generally, a certain amount of excess air is needed for complete combustion, but too much excess air can reduce the efficiency of the process. You can calculate the percentage of excess air by comparing the actual air fuel ratio to the ideal air fuel ratio for complete combustion.

In order to accurately determine these values, it may be helpful to consult with a colleague or refer to a textbook or online resources. Additionally, performing experiments or simulations can provide more precise data for calculation. I hope this helps and good luck with your homework!