Air Required for Hydrogen Combustion

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Which equation represents the air-fuel ratio (AF)?

AF = mass of fuel / mass of air

AF = mass of fuel / mass of combustion air

AF = mass of combustion air / mass of fuel (correct)

AF = mass of air / mass of fuel

What is the theoretical air-fuel ratio for the perfect combustion of methane (CH4)?

17.2 (correct)

12.324

2.054

20.64

If the air-fuel ratio for methane combustion in a particular boiler is 20.64, what is the excess air supplied?

10.27 kg/kg fuel

20%

124

3.44% (correct)

What is the total air required to operate the furnace, given that the excess air is 2.054 kg/kg fuel and the theoretical air is 10.27 kg/kg fuel?

12.324 kg/kg fuel Signup and view all the answers

Which of the following effects may occur if there is too much excess air in combustion?

Lower furnace temperature and reduced combustion efficiency Signup and view all the answers

What are the effects of not having enough excess air in combustion?

Reduced thermal efficiency and smoky flame Signup and view all the answers

What is the formula for calculating the mass of air required to supply a specific quantity of oxygen for combustion?

1 kg oxygen requires 4.35 kg of air Signup and view all the answers

What is the mass of air required for the complete combustion of 1 kg of carbon?

11.59 kg Signup and view all the answers

Which of the following is the correct equation for calculating the mass of air required for the combustion of hydrogen?

$m = M \times n$ Signup and view all the answers

What is the mass of air required for the combustion of 1 kg of hydrogen?

34.78 kg Signup and view all the answers

What is the equation for calculating the theoretical air required for the combustion of carbon, hydrogen, and sulfur?

$\text{Theoretical air} = C \times \frac{8}{23} + H_2 \times \frac{8}{23} + S \times \frac{3}{23}$ Signup and view all the answers

If the safe operation of a furnace requires 20% excess air and the theoretical air required is 10.27 kg per kg of fuel, what is the excess air in kg/kg fuel?

0.2054 kg/kg fuel Signup and view all the answers

Excess air is the amount of air supplied to a combustion process in addition to the theoretical air required for perfect combustion. The amounts of excess and theoretical air are usually expressed as mass (kg of air/kg of fuel) but can also be expressed as volumes or kilomoles.

$excess air = \frac{excess air}{theoretical air} \times 100% Signup and view all the answers

If the theoretical air required for the complete combustion of 1 kg of fuel is 10 kg, but the actual air supplied is 15 kg, what is the excess air as a percentage?

50% Signup and view all the answers

The total air supplied for combustion is defined as:

excess air + theoretical air Signup and view all the answers

Air Required for Hydrogen Combustion

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