Mastering Coal Classification and Combustion
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Questions and Answers

Which coal classification has the highest percentage of volatile matter?

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

Which coal classification has the highest carbon content?

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

Which coal classification is the most suitable fuel for utility boilers?

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

Which of the following equations represents the combustion of hydrogen correctly?

<p>2H2 + O2 -&gt; 2H2O (C)</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 (C)</p> Signup and view all the answers

What is the actual air supplied per kilogram of fuel in Example 15?

<p>15.98 kg (A)</p> Signup and view all the answers

What is the stoichiometric air required per kilogram of fuel in Example 15?

<p>10.65 kg (C)</p> Signup and view all the answers

Which class of coal has the highest calorific value?

<p>Anthracite (A)</p> Signup and view all the answers

Which class of coal is not well suited for stoker firing?

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

What is the moisture content of lignite?

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

What is the combustion equation for carbon?

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

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