Quiz 4 Flashcards
Provide the governing reactions for limestone scrubbing for SO2 removal
Limestone+ H20 + 2SO2 -> Ca + 2HSO3 + CO2
Thiosulfate is used in the following FGD processes to oxidize SO2 to sulfate:
A) Forced oxidation system
B) Limestone scrubbing
C) Inhibited Oxidation
D) Magnesium Oxide process
C) Inhibited Oxidation
Spray dryers are widely used in the process industries for SO2 removal. It is common practice to use following systems to collect particles:
A) ESP
B) Baghouse
C) Cyclone
D) Scrubbers
A) ESP
B) Baghouse
Increasing Hg concentrations in the air has been growing concern in urban area. In general, FGD scrubber is used for Hg removal (20-60%) from exhaust gases. To meet Hg emission limits for new plants, what control technology you can apply to achieve more removal efficiency (>80%) ?
You could use intake control: Add activated carbon
Mention three major sources of NOx emissions in the United States
Traffic, Power plants , (ADD)
Provide the governing reactions of selective catalytic reduction (SCR) technique using CO agent for NOx removal. What catalysts are typically used for SCR technique?
Reduction
2NO + 2CO -> N2 + CO2
Nitrogen content is high in the following fuel:
A) Heavy fuel
B) Light oil
C) Coal
D) Diesel
C) Coal
A coal-burning power plant burns coal at a rate of 4000 tons/day. The ash content of the coal is 5%, and the sulfur content is 1.5% by weight. The rate of CaCO3 is needed to capture 90% of the SO2 generated is about: (atomic weights are C=12, O=16, S=32, Ca= 40)
A) 54 tons/day
C) 85 tons/day
D) 108 tons/day
C) 169 tons/day
C) 169 tons/day