Combustion Particulate Formation Quiz
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Questions and Answers

Which of the following is true about nitrogen oxides (NOx)?

  • NOx is primarily composed of nitrogen trioxide (NO3)
  • NOx is primarily composed of nitrogen pentoxide (N2O5)
  • NOx is primarily composed of nitrogen dioxide (NO2) (correct)
  • NOx is primarily composed of nitrogen monoxide (NO)

    • What are the sources of nitrogen in NOx?

  • Atmospheric air and fuels (correct)
  • Atmospheric air only
  • Combustion temperature
  • Fuels only

    • Which type of nitrogen oxide is predominantly formed when natural gas or fuels with low nitrogen content are burned?

  • Nitrogen trioxide (NO3)
  • Fuel NOx
  • Prompt NOx
  • Thermal NOx (correct)

    • Which type of device measures the decrease in light intensity due to absorption and scattering?

    <p>a) Opacity meter</p> Signup and view all the answers

    N0^; emissions consist primarily of which compounds?

    <p>d) NO and N02</p> Signup and view all the answers

    Explain one method used to control sulfur dioxide and nitrogen oxides emissions.

    <p>a) Scrubbing with water</p> Signup and view all the answers

    Which formula is used to calculate the pressure of a gas?

    <p>Ideal gas law</p> Signup and view all the answers

    What is the formula mass for sulfur dioxide ($SO_2$)?

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

    What is the mass of 5 kmol of carbon dioxide ($CO_2$)?

    <p>176</p> Signup and view all the answers

    Which type of analysis gives exact percentages of each substance that makes up a sample of coal?

    <p>Ultimate analysis</p> Signup and view all the answers

    Which of the following is a highly efficient method to remove NOx from exhaust gases?

    <p>Ammonia or urea</p> Signup and view all the answers

    What is the temperature range in which selective catalytic reduction (SCR) can be used?

    <p>Between 260°C and 650°C (500°F and 1200°F)</p> Signup and view all the answers

    Which of the following is NOT a catalyst used in selective catalytic reduction (SCR)?

    <p>Electrostatic precipitators</p> Signup and view all the answers

    What is the maximum reduction of NOx that can be achieved by selective catalytic reduction (SCR)?

    <p>90%</p> Signup and view all the answers

    Which of the following methods is NOT used to control particulates in flue gas emissions?

    <p>Fluidized bed furnaces</p> Signup and view all the answers

    What is the maximum percentage of ash content that can become fly ash and leave with the flue gases in a cyclone furnace?

    <p>40%</p> Signup and view all the answers

    Which type of continuous monitoring analyzer is located directly within the flue gas path?

    <p>In situ analyzer</p> Signup and view all the answers

    How is particulate matter measured using an in situ transmissometer analyzer?

    <p>By reflecting light back to a measuring instrument</p> Signup and view all the answers

    1. Which method is used to reduce NOx in applications where furnace residence time exceeds one second and combustion NOx levels are relatively high?

    <p>Selective non-catalytic reduction (SNCR)</p> Signup and view all the answers

    1. What is the temperature range within which selective non-catalytic reduction (SNCR) is most effective?

    <p>870°C-1100°C (1598°F-2012°F)</p> Signup and view all the answers

    1. Which of the following is NOT a method used to control NOx in the combustion process?

    <p>Selective catalytic reduction (SCR)</p> Signup and view all the answers

    1. What is the maximum percentage by which selective non-catalytic reduction (SNCR) can reduce NOx?

    <p>70%</p> Signup and view all the answers

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