Lecture_11

Lecture_11 - Electricity from power plants Coal HEAT Steam...

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Electricity from power plants Coal HEAT Steam H 2 O (l) Steam WORK Flue gas COAL AIR turbine condenser pump Boiler
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static.howstuffworks.com/gif/acid-rain-1a.jpg
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Czech Republic Adirondacks, NY Adirondacks, NY Appalachian  Appalachian  mountains mountains Great Smoky Mountains Poland Poland
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movie http://www.youtube.com/watch?v=6JcNlaD2j-4
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Coal (C, H, O, S) + O 2 CO 2 , H 2 O, SO 2 + HEAT Acid Rain: SO 2 + ½ O 2 + H 2 O H 2 SO 4 light heat EPA limit: 0.5 lb m SO 2 per 10 6 BTU Ash production: Bottom ash → solids (can be collected) Fly ash → goes out with flue gas Use a “scrubber” to collect fly ash! Flue gas + solids: N 2 , O 2 , H 2 O, CO 2 , SO 2 , fly ash, inerts How to remove? Remove in scrubber Use a chemical reaction to incorporate the sulphur into a solid that will precipitate out CaO + ½ O 2 + SO 2 → CaSO 4 (s) (lime) (calcium sulphate) Lime from chalk CaCO 3 CaO + CO 2 (g) Heat (500 - 600 o C)
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heater mixer scrubber Flue gas
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This note was uploaded on 11/12/2009 for the course CHEM 2190 at Cornell.

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Lecture_11 - Electricity from power plants Coal HEAT Steam...

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