Electrostatic precipitator - Revision history

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energy>Jmdonev at 03:02, 13 August 2018

2018-08-13T03:02:31Z

← Older revision		Revision as of 03:02, 13 August 2018
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	[[Category:Done ~~2016~~-04-30]]		[[Category:Done 2018-08-03]]
	[[File:Elektrofilter_Maria_Gugging.jpg\|360px\|thumb\|right\|Figure 1. An electrostatic precipitator.<ref>Wikimedia Commons. (July 15, 2015). ''Electrostatic Precipitator'' [Online]. Available: https://upload.wikimedia.org/wikipedia/commons/c/c4/Elektrofilter_Maria_Gugging.jpg</ref>]]		[[File:Elektrofilter_Maria_Gugging.jpg\|360px\|thumb\|right\|Figure 1. An electrostatic precipitator.<ref>Wikimedia Commons. (July 15, 2015). ''Electrostatic Precipitator'' [Online]. Available: https://upload.wikimedia.org/wikipedia/commons/c/c4/Elektrofilter_Maria_Gugging.jpg</ref>]]

	<onlyinclude>An '''electrostatic precipitator''' is a type of filter that uses [[static electricity]] to remove [[soot]] and [[ash]] from exhaust fumes before they exit the [[smokestack]]s.</onlyinclude><ref name="RE1">Chris Woodford. (July 15, 2015). ''How Does an Electrostatic Precipitator Work?'' [Online]. Available: http://www.explainthatstuff.com/electrostaticsmokeprecipitators.html</ref> This one common [[Air pollution control devices\|air pollution control device]]. Most power stations burn [[fossil fuel]]s such as [[coal]] or [[oil]] to [[electricity generation\|generate electricity]] for use. When these [[fuel]]s undergo [[combustion]], [[smoke]] is produced.<ref name="RE2">BBC Bitesized. (July 15, 2015). ''Electrostatic Precipitators'' [Online]. Available: http://www.bbc.co.uk/schools/gcsebitesize/science/add_ocr_gateway/radiation/electrostaticsusesrev1.shtml</ref> Smoke consists of tiny particles of soot that are suspended in hot, rising air. These unburned particles of [[carbon]] are pulled out of the smoke by using static electricity in the precipitators, leaving clean, hot air to escape the smokestacks.<ref name="RE1"/> It is vital to remove this unreacted carbon from the smoke, as it can damage buildings and [[Health effects of air pollution\|harm human health]] - especially respiratory health.		<onlyinclude>An '''electrostatic precipitator''' is a type of filter ([[dry scrubber]]) that uses [[static electricity]] to remove [[soot]] and [[ash]] from exhaust fumes before they exit the [[smokestack]]s.</onlyinclude><ref name="RE1">Chris Woodford. (July 15, 2015). ''How Does an Electrostatic Precipitator Work?'' [Online]. Available: http://www.explainthatstuff.com/electrostaticsmokeprecipitators.html</ref> This one common [[Air pollution control devices\|air pollution control device]]. Most power stations burn [[fossil fuel]]s such as [[coal]] or [[oil]] to [[electricity generation\|generate electricity]] for use. When these [[fuel]]s undergo [[combustion]], [[smoke]] is produced.<ref name="RE2">BBC Bitesized. (July 15, 2015). ''Electrostatic Precipitators'' [Online]. Available: http://www.bbc.co.uk/schools/gcsebitesize/science/add_ocr_gateway/radiation/electrostaticsusesrev1.shtml</ref> Smoke consists of tiny particles of soot that are suspended in hot, rising air. These unburned particles of [[carbon]] are pulled out of the smoke by using static electricity in the precipitators, leaving clean, hot air to escape the smokestacks.<ref name="RE1"/> It is vital to remove this unreacted carbon from the smoke, as it can damage buildings and [[Health effects of air pollution\|harm human health]] - especially respiratory health.

	==How They Work==		==How They Work==
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	The effectiveness of a certain precipitator is determined by how well the specific device deals with the unique features and problems of the plant it is used at. Additionally, precipitator effectiveness is also determined by the temperature and moisture content of the flue gas.<ref name="RE1"/>		The effectiveness of a certain precipitator is determined by how well the specific device deals with the unique features and problems of the plant it is used at. Additionally, precipitator effectiveness is also determined by the temperature and moisture content of the flue gas.<ref name="RE1"/>

			==For Further Reading==
			*[[Scrubber]]
			*[[Dry scrubber]]
			*[[Wet scrubber]]
			*[[Exhaust gas]]
			*[[Pollutant]]
			*Or explore a [[Special:Random\|random page]]
	==References==		==References==
	{{reflist}}		{{reflist}}
	[[Category:Uploaded]]		[[Category:Uploaded]]
	~~[[category: Mark edit]]~~

Jmdonev: 1 revision imported: From the summer

2016-09-17T22:29:50Z

1 revision imported: From the summer

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Jmdonev at 04:16, 4 September 2016

2016-09-04T04:16:35Z

← Older revision		Revision as of 04:16, 4 September 2016
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	[[Category:Done ~~2015~~-07-24]]		[[Category:Done 2016-04-30]]
	[[File:Elektrofilter_Maria_Gugging.jpg\|360px\|thumb\|right\|Figure 1. An electrostatic precipitator.<ref>Wikimedia Commons. (July 15, 2015). ''Electrostatic Precipitator'' [Online]. Available: https://upload.wikimedia.org/wikipedia/commons/c/c4/Elektrofilter_Maria_Gugging.jpg</ref>]]		[[File:Elektrofilter_Maria_Gugging.jpg\|360px\|thumb\|right\|Figure 1. An electrostatic precipitator.<ref>Wikimedia Commons. (July 15, 2015). ''Electrostatic Precipitator'' [Online]. Available: https://upload.wikimedia.org/wikipedia/commons/c/c4/Elektrofilter_Maria_Gugging.jpg</ref>]]

	<onlyinclude>An '''electrostatic precipitator''' is a type of filter that uses [[static electricity]] to remove [[soot]] and [[ash]] from exhaust fumes before they exit the [[smokestack]]s.</onlyinclude><ref name="RE1">Chris Woodford. (July 15, 2015). ''How Does an Electrostatic Precipitator Work?'' [Online]. Available: http://www.explainthatstuff.com/electrostaticsmokeprecipitators.html</ref> Most power stations burn [[fossil fuel]]s such as [[coal]] or [[oil]] to [[electricity generation\|generate electricity]] for use. When these ~~fuels~~ undergo [[combustion]], [[smoke]] is produced.<ref name="RE2">BBC Bitesized. (July 15, 2015). ''Electrostatic Precipitators'' [Online]. Available: http://www.bbc.co.uk/schools/gcsebitesize/science/add_ocr_gateway/radiation/electrostaticsusesrev1.shtml</ref> Smoke consists of tiny particles of soot that are suspended in hot, rising air. These unburned particles of [[carbon]] are pulled out of the smoke by using static electricity in the precipitators, leaving clean, hot air to escape the smokestacks.<ref name="RE1"/> It is vital to remove this unreacted carbon from the smoke, as it can damage buildings and [[Health effects of air pollution\|harm human health]] - especially respiratory health.		<onlyinclude>An '''electrostatic precipitator''' is a type of filter that uses [[static electricity]] to remove [[soot]] and [[ash]] from exhaust fumes before they exit the [[smokestack]]s.</onlyinclude><ref name="RE1">Chris Woodford. (July 15, 2015). ''How Does an Electrostatic Precipitator Work?'' [Online]. Available: http://www.explainthatstuff.com/electrostaticsmokeprecipitators.html</ref> This one common [[Air pollution control devices\|air pollution control device]]. Most power stations burn [[fossil fuel]]s such as [[coal]] or [[oil]] to [[electricity generation\|generate electricity]] for use. When these [[fuel]]s undergo [[combustion]], [[smoke]] is produced.<ref name="RE2">BBC Bitesized. (July 15, 2015). ''Electrostatic Precipitators'' [Online]. Available: http://www.bbc.co.uk/schools/gcsebitesize/science/add_ocr_gateway/radiation/electrostaticsusesrev1.shtml</ref> Smoke consists of tiny particles of soot that are suspended in hot, rising air. These unburned particles of [[carbon]] are pulled out of the smoke by using static electricity in the precipitators, leaving clean, hot air to escape the smokestacks.<ref name="RE1"/> It is vital to remove this unreacted carbon from the smoke, as it can damage buildings and [[Health effects of air pollution\|harm human health]] - especially respiratory health.

	==How They Work==		==How They Work==
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	{{reflist}}		{{reflist}}
	[[Category:Uploaded]]		[[Category:Uploaded]]
			[[category: Mark edit]]

J.williams: 1 revision imported

2015-08-26T21:30:51Z

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J.williams at 16:49, 12 August 2015

2015-08-12T16:49:20Z

New page

[[Category:Done 2015-07-24]]
[[File:Elektrofilter_Maria_Gugging.jpg|360px|thumb|right|Figure 1. An electrostatic precipitator.<ref>Wikimedia Commons. (July 15, 2015). ''Electrostatic Precipitator'' [Online]. Available: https://upload.wikimedia.org/wikipedia/commons/c/c4/Elektrofilter_Maria_Gugging.jpg</ref>]]

<onlyinclude>An '''electrostatic precipitator''' is a type of filter that uses [[static electricity]] to remove [[soot]] and [[ash]] from exhaust fumes before they exit the [[smokestack]]s.</onlyinclude><ref name="RE1">Chris Woodford. (July 15, 2015). ''How Does an Electrostatic Precipitator Work?'' [Online]. Available: http://www.explainthatstuff.com/electrostaticsmokeprecipitators.html</ref> Most power stations burn [[fossil fuel]]s such as [[coal]] or [[oil]] to [[electricity generation|generate electricity]] for use. When these fuels undergo [[combustion]], [[smoke]] is produced.<ref name="RE2">BBC Bitesized. (July 15, 2015). ''Electrostatic Precipitators'' [Online]. Available: http://www.bbc.co.uk/schools/gcsebitesize/science/add_ocr_gateway/radiation/electrostaticsusesrev1.shtml</ref> Smoke consists of tiny particles of soot that are suspended in hot, rising air. These unburned particles of [[carbon]] are pulled out of the smoke by using static electricity in the precipitators, leaving clean, hot air to escape the smokestacks.<ref name="RE1"/> It is vital to remove this unreacted carbon from the smoke, as it can damage buildings and [[Health effects of air pollution|harm human health]] - especially respiratory health.

==How They Work==
[[File:2000px-Electrostatic_precipitator.png|360px|thumb|left|Figure 2. A model of an electrostatic precipitator using metal wires as the negative electrodes and large plates as the positive electrodes.<ref>Wikimedia Commons. (July 15, 2015). ''Electrostatic Precipitator'' [Online]. Available: https://upload.wikimedia.org/wikipedia/commons/thumb/5/52/Electrostatic_precipitator.svg/2000px-Electrostatic_precipitator.svg.png</ref>]]
The operation of electrostatic precipitators is fairly simple. The dirty [[flue gas]] escaping through the smokestack is passed through two [[electrode]]s. The shape these electrodes take depends on the type of electrostatic precipitator used, but they can be metal wires, bars, or plates inside a pipe or the smokestack itself. One of the electrodes is charged with a high negative [[voltage]], and this plate causes particulates inside the smoke to obtain a negative [[charge]] as they pass by this electrode.<ref name="RE1"/> Further along the pipe, the second electrode carries a similarly high positive voltage. Based solely on the fact that opposite charges attract, the negatively charged soot particles are pulled towards the positive electrode and stick to it. Occasionally these plates must be cleaned to remove the accumulated soot and dispose of it into a [[hopper]]. The soot and ash collected from [[coal-fired power plant|coal burning power plants]] in this manner is referred to as [[fly ash]].<ref name="RE3"/>

Even though most electrostatic precipitators work in a similar way, there are many variations and different types that work better for different sized particles, different smoke compositions, and different amounts of [[pollution]]. The need for a variety of designs comes partly from the fact that coal burned around the world varies in its chemical composition drastically. Other power plants may look to remove certain pollutants - such as [[sulfur oxides|sulfur dioxide]] - or look to minimize the amount of ash produced. Additionally, some low-[[sulfur]] coals that are burned have a higher electrical [[resistivity]], which makes it more difficult to remove the ash produced by this coal using electrostatic precipitators.<ref name="RE1"/>

==Effectiveness==
Electrostatic precipitators are extremely effevtive, and are capable of removing more than 99% of [[particulate matter]]. Since 1940, [[emission]]s of particulate matter smaller than 10 micrometers have been reduced by a factor of 5. However, this high level of effectiveness comes at a high cost - about 2-4% of a power plant's electrical energy output goes into operating electrostatic precipitators and other systems used to remove particulate matter.<ref name="RE3"> R. Wolfson. ''Energy, Environment and Climate'', 2nd ed. New York, U.S.A.: Norton, 2012</ref>

The effectiveness of a certain precipitator is determined by how well the specific device deals with the unique features and problems of the plant it is used at. Additionally, precipitator effectiveness is also determined by the temperature and moisture content of the flue gas.<ref name="RE1"/>

==References==
{{reflist}}
[[Category:Uploaded]]