Natural Gas Properties and Combustion Quiz
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Questions and Answers

Which of the following is true about natural gas for steam generation purposes?

  • It requires high amounts of excess air for complete combustion.
  • It is a mixture of several gases including methane, ethane, and propane.
  • It contains ash which aids in combustion.
  • It is usually processed before use. (correct)

    • Which of the following gases is typically removed from natural gas before combustion?

  • Methane
  • Hydrogen sulfide (correct)
  • Carbon dioxide
  • Nitrogen

    • What is the typical range of heating value for natural gas?

  • 10,000 to 20,000 kj/kg
  • 46,420 to 55,700 kj/kg (correct)
  • 25,000 to 35,000 kj/kg
  • 60,000 to 70,000 kj/kg

    • Based on the given information, what is the stoichiometric volume of oxygen required for the complete combustion of 1 m^3 of methane gas?

    <p>9.52 m^3</p> Signup and view all the answers

    In the given example, if a boiler burns 50 m^3/h of methane gas at 10% excess air, what is the air flow supplied per hour?

    <p>523.6 m^3/h</p> Signup and view all the answers

    In one hour, how much volume of nitrogen gas is produced when a boiler burns 50 m^3/h of methane gas at 10% excess air?

    <p>376 m^3</p> Signup and view all the answers

    Which of the following is an advantage of natural gas as a fuel?

    <p>It easily mixes with air for complete combustion.</p> Signup and view all the answers

    What is the disadvantage of natural gas mentioned in the text?

    <p>It is less efficient in combustion due to its hydrogen content.</p> Signup and view all the answers

    What is the mass of nitrogen in the combustion air if the mass of air containing 4 kg of oxygen is 17.24 kg?

    <p>13.24 kg</p> Signup and view all the answers

    If a boiler uses 500 kg/h of methane and has an airflow of 10,320 kg/h, what is the percent of excess air?

    <p>19.7%</p> Signup and view all the answers

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