22 Questions
Which of the following is the primary component of nitrogen oxides (NOx) produced during combustion?
Nitrogen monoxide (NO)
What is the predominant form of nitrogen oxides (NOx) when burning natural gas or fuels with low nitrogen content?
Thermal NOx
Which of the following factors does NOT influence the formation of nitrogen oxides (NOx) during combustion?
Fuel volatility
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
Which type of fuel can have an ash content ranging from 5% to 30%?
Coal
What is the maximum percentage of ash content that becomes fly ash in a fluidized bed furnace?
100%
Which method of controlling particulates uses centrifugal force to remove larger particles from the flue gas?
Cyclone separators
What is the efficiency of baghouse filters in the removal of particulate matter?
Greater than 99%
Which of the following is the most efficient method to remove NOx from exhaust gases?
Selective catalytic reduction (SCR)
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)
What is the major component of acid rain?
Sulfuric acid (H2SO4)
What is the best control method for sulfur dioxide (SO2) emissions?
Burning fuels with no sulfur content
Which process is used for the non-catalytic control of nitrogen oxides (NOx)?
Selective non-catalytic reduction (SNCR)
What is the temperature range for selective non-catalytic reduction (SNCR)?
1600°F-2000°F
Which method of NOx control is not generally used in boilers that have high turndown capabilities and modulate or cycle frequently?
Selective non-catalytic reduction (SNCR)
What is the reduction reaction for the catalytic and non-catalytic removal of NOx?
Nitrogen oxide + Ammonia + Oxygen -> Nitrogen + 4NO 4NH3 -> 4N2 + Water 6H2O
Which of the following is the formula mass for sulfur dioxide ($SO_2$)?
64
What is the mass of 5 kmol of carbon dioxide ($CO_2$)?
176
For complete combustion of 24 kg of carbon (C), what mass of oxygen ($O_2$) is required?
88 kg
A burner takes 20 kg/min excess air. If the theoretical air is 60 kg/min, what is the percent of excess air?
30%
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.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
