Air Required for Hydrogen Combustion
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Questions and Answers

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?

    <p>12.324 kg/kg fuel</p> Signup and view all the answers

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

    <p>Lower furnace temperature and reduced combustion efficiency</p> Signup and view all the answers

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

    <p>Reduced thermal efficiency and smoky flame</p> 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?

    <p>1 kg oxygen requires 4.35 kg of air</p> Signup and view all the answers

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

    <p>11.59 kg</p> 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?

    <p>$m = M \times n$</p> Signup and view all the answers

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

    <p>34.78 kg</p> Signup and view all the answers

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

    <p>$\text{Theoretical air} = C \times \frac{8}{23} + H_2 \times \frac{8}{23} + S \times \frac{3}{23}$</p> 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?

    <p>0.2054 kg/kg fuel</p> 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.

    <p>$excess air = \frac{excess air}{theoretical air} \times 100%</p> 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?

    <p>50%</p> Signup and view all the answers

    The total air supplied for combustion is defined as:

    <p>excess air + theoretical air</p> Signup and view all the answers

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