Air Required for Hydrogen Combustion
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Excess air is the amount of air supplied to a combustion process in addition to the theoretical air required for perfect combustion. It is calculated using the equation: excess air = \frac{{\text{{actual air supplied}} - \text{{theoretical air}}}},{{\text{{theoretical air}}}} \times 100%$

  • Excess air is always greater than the theoretical air.
  • Excess air is always less than the theoretical air.
  • Excess air is equal to the theoretical air.
  • The relationship between excess air and theoretical air depends on the fuel and combustion process. (correct)

    • Which element requires the least amount of air for complete combustion?

  • Sulfur
  • Carbon
  • Hydrogen (correct)
  • Oxygen

    • What is the combustion equation for hydrogen?

  • C + O2 -> CO2
  • S + O2 -> SO2
  • 2H2 + O2 -> 2H2O (correct)
  • 2N2 + O2 -> 2N2O

    • What is the molar mass of carbon dioxide (CO2)?

    <p>32 kg/kmol (C)</p> Signup and view all the answers

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

    <p>11.59 kg (D)</p> Signup and view all the answers

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

    <p>AF = mass of combustion air / mass of fuel (A)</p> Signup and view all the answers

    Which equation calculates the percent of excess air in terms of the air-fuel ratio?

    <p>Percent excess air = (supplied - theoretical) / theoretical x 100% (C)</p> Signup and view all the answers

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

    <p>17.2 (B)</p> Signup and view all the answers

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

    <p>20% (C)</p> Signup and view all the answers

    According to the text, what is the mass of air required for the combustion of 1 kg of hydrogen?

    <p>34.78 kg air (C)</p> Signup and view all the answers

    According to the text, what is the mass of air required for the combustion of 1 kg of sulfur?

    <p>4.35 kg air (D)</p> Signup and view all the answers

    According to the text, what is the theoretical air required for the combustion of carbon, hydrogen, and sulfur?

    <p>10.27 kg air/kg fuel (D)</p> Signup and view all the answers

    According to the text, how is excess air calculated?

    <p>mass of air supplied - mass of theoretical air (B)</p> Signup and view all the answers

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