Mastering Coal Classification and Combustion
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Questions and Answers

Which of the following is NOT one of the main groups of coal classified by the American Society for Testing and Materials (ASTM)?

  • Lignite
  • Anthracite
  • Sub-bituminous (correct)
  • Bituminous

    • What is the main difference between anthracite coal and bituminous coal?

  • Anthracite coal has a lower heating value than bituminous coal.
  • Bituminous coal has a higher ignition temperature than anthracite coal.
  • Anthracite coal has a higher carbon content than bituminous coal.
  • Bituminous coal has a higher percentage of volatile matter than anthracite coal. (correct)

    • Which type of coal is the largest group and tends to produce a sticky, cohesive mass when heated?

  • Lignite
  • Anthracite
  • Sub-bituminous
  • Bituminous (correct)

    • Which type of coal is black in color, has high moisture content, and disintegrates when exposed to air?

    <p>Lignite coal</p> Signup and view all the answers

    What is the calorific value of Bituminous A coal in kilojoules per kilogram (kJ/kg)?

    <p>32,564</p> Signup and view all the answers

    Which type of coal has the highest volatile matter content?

    <p>Bituminous coal</p> Signup and view all the answers

    What is the combustion equation for carbon?

    <p>carbon + oxygen -&gt; carbon dioxide</p> Signup and view all the answers

    According to the text, what is the equation for the combustion of hydrogen?

    <p>hydrogen + oxygen -&gt; water vapour</p> Signup and view all the answers

    What is the mass of dry flue gas produced per kilogram of fuel in Example 15?

    <p>16.44 kg</p> Signup and view all the answers

    What is the actual air supplied for the combustion of 1 kg of fuel in Example 15?

    <p>15.98 kg air/kg fuel</p> Signup and view all the answers

    What is the stoichiometric air required for the combustion of 1 kg of fuel in Example 15?

    <p>2.47 kg air/kg fuel</p> Signup and view all the answers

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