- Hal B. Wansley Power Plant
Hal B. Wansley Power Plant is a
power stationat Carrollton, Georgia, USA. Its various units, powered by coal, oil, and natural gas,cite web
title = Plant Wansley brochure
Georgia Power Company
year = 2003
url = http://www.georgiapower.com/about/pdf/Plant%20Wansley%20brochure.pdf
accessdate = 2008-08-07] are operated by
Southern Company, Georgia Power Company, Oglethorpe Power Corporation, and Municipal Electric Authority.cite press release
title = Plant Wansley
publisher = Southern Company
date = 2005-07-31
url = http://www.southernco.com/generation/f_wansley.pdf
accessdate = 2007-01-12] It has one of the tallest chimneys in the world (305 meters), built in
The plant is located at coord|33|24|48|N|85|01|57|W|display=inline,title in the north-east corner of
Heard County, Georgia, about convert|20|km|mi south of Carrollton.
Yellow Dirt Church Cemetery
Historic Yellow Dirt Church Cemetery is located on the grounds of the power plant. Visitors have to stop at the plant's gate and have a security guard escort them to the cemetery. [cite web
title = Yellow Dirt Church Cemetery
publisher = RootsWeb
year = 2006
url = http://freepages.genealogy.rootsweb.ancestry.com/~ala1davis/genealogy/states/georgia/heard/yellowdirt/yellowdirt.html
accessdate = 2008-08-07]
outhern Company owned
* Two dual-use Units 1 and 2 (also known as SG01 and SG02) [cite court
litigants=Sierra Club, Physicians For Social Responsibility, Georgia Forestwatch, and Eileen Lange v. Georgia Power Company
court=Eleventh Circuit U.S. Court of Appeals
url=http://caselaw.findlaw.com/data2/circs/11th/0511314p.pdf ] can be fueled either by
bituminous coalor by oil. They are rated at 952 MWeeach, and were launched into service in 1976 and 1978.cite web
title = Existing Electric Generating Units in the United States, 2006
Energy Information Administration, U.S. Department of Energy
year = 2006
url = http://www.eia.doe.gov/cneaf/electricity/page/capacity/capacity.html
format = Excel
accessdate = 2008-07-14]
* Oil-fired Unit 5A is rated 52.8 MWe, it was launched in 1980.
Georgia Power Company owned
Natural gas-fired combined-cyclesteam plant Units ST6 and ST7 are rated at 213.3 MWe each, and were launched in 2002.
* Natural gas-fired combined-cycle
steam turbines of Units CT6A, CT6B, CT7A, and CT7B are rated at 203.1 MWe each and were also launched in June, 2002.
Collectively, units ST6, CT6A, and CT6B are referred to as unit 6. Same is true about its twin unit 7.
Oglethorpe Power Corporation owned
Unit 8, also known as Chattahoochee Energy Facility, consists of three combined-cycle gas-powered generators: 1 and 2, rated at 176 MWe each, and 3, rated at 187.7 MWe. All of them were launched into service in 2003.
Municipal Electric Authority owned
Wansley Unit 9 consists of three combined-cycle gas-powered generators: CT1 and CT2, rated at 171 MWe each, and ST1, rated at 226 MWe. All of them were launched into service in 2004.
Coal is delivered via a railroad by 100-car trains, each carrying 10,000 tons of coal. At the plant, an automated unloading trestle empties the train in about 30 minutes and conveyor belts move the coal to the storage pile or the storage bunkers inside the plant. The bunkers hold a 14-hour reserve; the coal pile target inventory is a 32-day supply.
Coal is coarsely crushed at the mine then crushed again at the plant as it travels to the storage bunkers inside the boiler house. A pulverizer below each bunker grinds the coal to a fine powder that is mixed with air and blown into the boiler through a network of pipes. With both units at full load, Plant Wansley burns about 14,000 tons of coal every 24 hours. Annual consumption averages four to five million tons.
Cooling water is taken up from the "service water pond", created by
damming a small creek flowing from the north-west into the Chattahoochie Riverimmediately on the south-eastern side of the plant.
At coal-fired units 1 and 2, water is converted to steam at convert|1000|F|C|sigfig=2 temperature and convert|3600|psi|MPa|lk=on|adj=on|abbr=on pressure. At full 920 MWe load, each turbine processes convert|6200000|lb|metric ton|sigfig=2 of steam per hour. Low pressure steam exits the turbine into a condenser where it is cooled and converted back into water to repeat the cycle. During this cooling process required by the
second law of thermodynamics, waste heat from the condensing steam is absorbed by the warm water that circulates through the cooling towers, where it cools by evaporation and forced convectionof air.
Electrostatic precipitators on units 1 and 2 remove more than 99% of the fly ash from the boiler exhaust stream. A digital boiler control system, low NOx burners and Selective Catalytic Reactors, installed since initial operation, have reduced nitrogen oxide (NOx) emissions by almost 90%. The use of cooling towers and the closed-loop steam cycle prevent thermal pollution in the Chattahoochee River.
* [http://www.skyscraperpage.com/diagrams/?b5385 Chimney Diagram]
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