GATE CE 2018 Set 2 — Question 60
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Environmental Engineering → Air Pollution → Sources of Air Pollutants
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Question
A coal containing 2% sulfur is burned completely to ash in a brick kiln at a rate of 30 kg/min. The sulfur content in the ash was found to be 6% of the initial amount of sulfur present in the coal fed to the brick kiln. The molecular weights of S, H and O are 32, 1 and 16 g/mole, respectively. The annual rate of sulfur dioxide (SO) emission from the kiln (in tonnes/year, up to two decimal places) is ______
Correct answer
590 to 595
Solution
1.Calculate the rate of sulfur input:
Coal feed rate = 30 kg/minSulfur content = 2% of 30 kg/min = kg/min
2.Calculate sulfur retained in ash:
Sulfur in ash = 6% of initial sulfur = kg/min3.Calculate sulfur emitted as SO:
Sulfur emitted = Initial sulfur - Sulfur in ash = kg/min4.Calculate SO emission rate:
Reaction: Molecular weight of S = 32 g/mol
Molecular weight of SO = g/mol
Mass of SO emitted = kg/min
5.Calculate annual emission rate:
Minutes in a year = min/yearAnnual SO emission = kg/year
6.Convert to tonnes/year:
Annual emission = tonnes/yearRounding to two decimal places, the annual rate is 592.88 tonnes/year.Continue learning with Success Tracker
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