22 Questions
Which of the following is true about nitrogen oxides (NOx)?
NOx is primarily composed of nitrogen dioxide (NO2)
What are the sources of nitrogen in NOx?
Atmospheric air and fuels
Which type of nitrogen oxide is predominantly formed when natural gas or fuels with low nitrogen content are burned?
Thermal NOx
Which type of device measures the decrease in light intensity due to absorption and scattering?
a) Opacity meter
N0^; emissions consist primarily of which compounds?
d) NO and N02
Explain one method used to control sulfur dioxide and nitrogen oxides emissions.
a) Scrubbing with water
Which formula is used to calculate the pressure of a gas?
Ideal gas law
What is the formula mass for sulfur dioxide ($SO_2$)?
32
What is the mass of 5 kmol of carbon dioxide ($CO_2$)?
176
Which type of analysis gives exact percentages of each substance that makes up a sample of coal?
Ultimate analysis
Which of the following is a highly efficient method to remove NOx from exhaust gases?
Ammonia or urea
What is the temperature range in which selective catalytic reduction (SCR) can be used?
Between 260°C and 650°C (500°F and 1200°F)
Which of the following is NOT a catalyst used in selective catalytic reduction (SCR)?
Electrostatic precipitators
What is the maximum reduction of NOx that can be achieved by selective catalytic reduction (SCR)?
90%
Which of the following methods is NOT used to control particulates in flue gas emissions?
Fluidized bed furnaces
What is the maximum percentage of ash content that can become fly ash and leave with the flue gases in a cyclone furnace?
40%
Which type of continuous monitoring analyzer is located directly within the flue gas path?
In situ analyzer
How is particulate matter measured using an in situ transmissometer analyzer?
By reflecting light back to a measuring instrument
- Which method is used to reduce NOx in applications where furnace residence time exceeds one second and combustion NOx levels are relatively high?
Selective non-catalytic reduction (SNCR)
- What is the temperature range within which selective non-catalytic reduction (SNCR) is most effective?
870°C-1100°C (1598°F-2012°F)
- Which of the following is NOT a method used to control NOx in the combustion process?
Selective catalytic reduction (SCR)
- What is the maximum percentage by which selective non-catalytic reduction (SNCR) can reduce NOx?
70%
Test your knowledge on the formation of particulates in combustion processes! This quiz will cover topics such as the presence of ash in fossil fuels and biomass fuels, the different types of ash, and the characteristics of fly ash. See how well you understand the formation and behavior of particulate matter in combustion.
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