Supercritical coal plant - Revision history

Jmdonev: 1 revision imported

2018-06-25T14:30:26Z

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Jmdonev at 20:28, 8 June 2018

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	[[Category:Done ~~2015~~-07-24]]		[[Category:Done 2018-06-15]]
	[[File:RDK_HW.jpg\|350px\|thumb\|Figure 1. RDK-8, a supercritical coal plant in Germany achieves thermal efficiency of 46%.<Ref>Wikimedia Commons, Available: https://upload.wikimedia.org/wikipedia/commons/6/62/RDK_HW.jpg</ref>]]		[[File:RDK_HW.jpg\|350px\|thumb\|Figure 1. RDK-8, a supercritical coal plant in Germany achieves thermal efficiency of 46%.<Ref>Wikimedia Commons, Available: https://upload.wikimedia.org/wikipedia/commons/6/62/RDK_HW.jpg</ref>]]

	<onlyinclude>'''Supercritical coal plants''' are a type of [[coal-fired power plant]] used in more modern designs. They differ from traditional coal power plants because the [[water]] running through it works as a [[supercritical fluid]], meaning it is neither a [[liquid]] or a [[gas]].</onlyinclude> This occurs when water reaches its [[critical point of water\|critical point]] under high [[pressure]]s and [[temperature]]s, specifically at 22 [[pascal\|MPa]] and 374[[Celsius\|<sup>o</sup>C]].<ref name=bhe>Bright Hub engineering. (June 18 2015). ''What is a supercritical power plant?'' [Online], Available: http://www.brighthubengineering.com/power-plants/32893-what-is-a-supercritical-power-plant/</ref>		<onlyinclude>'''Supercritical coal plants''' are a type of [[coal-fired power plant]] used in more modern designs. They differ from traditional coal power plants because the [[water]] running through it works as a [[supercritical fluid]], meaning it is neither a [[liquid]] or a [[gas]].</onlyinclude> This occurs when water reaches its [[critical point of water\|critical point]] under high [[pressure]]s and [[temperature]]s, specifically at 22 [[pascal\|MPa]] and 374[[Celsius\|<sup>o</sup>C]].<ref name=bhe>Bright Hub engineering. (June 18 2015). ''What is a supercritical power plant?'' [Online], Available: http://www.brighthubengineering.com/power-plants/32893-what-is-a-supercritical-power-plant/</ref>

	As a liquid approaches its critical point, its [[Thermal energy#Vaporization\|latent heat of vaporization]] begins to decrease until it reaches zero at the critical point.<Ref name=bhe/> This means that the amount of [[energy]] needed to change the water into [[steam]] becomes less and less, and eventually the water's vaporization [[phase change]] is instant. This reduces the amount of [[heat transfer]] to the water that is normally needed in a conventional coal plant, ~~which means that~~ less [[coal]] ~~needs to be~~ used to heat an amount of water. This increases the plant's [[thermal efficiency]] by a considerable amount.<Ref name=bhe2>Bright Hub Engineering. (June 18 2015). ''How are Supercritical Boilers different from Subcritical Boilers?'' [Online], Available: http://www.brighthubengineering.com/power-plants/32896-how-are-supercritical-boilers-different-from-subcritical-boilers/</ref>		As a liquid approaches its critical point, its [[Thermal energy#Vaporization\|latent heat of vaporization]] begins to decrease until it reaches zero at the critical point.<Ref name=bhe/> This means that the amount of [[energy]] needed to change the water into [[steam]] becomes less and less, and eventually the water's vaporization [[phase change]] is instant. This reduces the amount of [[heat transfer]] to the water that is normally needed in a conventional coal plant, therefore, less [[coal]] is used to heat the same amount of water. This increases the plant's [[thermal efficiency]] by a considerable amount.<Ref name=bhe2>Bright Hub Engineering. (June 18 2015). ''How are Supercritical Boilers different from Subcritical Boilers?'' [Online], Available: http://www.brighthubengineering.com/power-plants/32896-how-are-supercritical-boilers-different-from-subcritical-boilers/</ref>

	===Efficiency===		===Efficiency===
	These plants are the standard for new coal power plants, as their efficiencies can reach around 44%, compared to older coal power plants that operate around 33%. Even higher pressure and temperature power plants are under research and development, known as '''ultra-supercritical''', potentially reaching an efficiency of near 50%.<ref name=coal>World Coal Association. (June 18 2015). ''Improving efficiencies'' [Online], Available: http://www.worldcoal.org/coal-the-environment/coal-use-the-environment/improving-efficiencies/</ref>		These plants are the standard for new coal power plants, as their efficiencies can reach around 44%, compared to older coal power plants that operate around 33%. Even higher pressure and temperature power plants are under research and development, known as '''ultra-supercritical''', potentially reaching an efficiency of near 50%.<ref name=coal>World Coal Association. (June 18 2015). ''Improving efficiencies'' [Online], Available: http://www.worldcoal.org/coal-the-environment/coal-use-the-environment/improving-efficiencies/</ref>

	Improved efficiency corresponds to fewer [[greenhouse gas emission]]s, as well as [[pollutant]]s like [[NOx]], [[SOx]], and [[particulate matter]] which all cause adverse [[deaths per TWh\|health effects]]. ~~When choosing to build a~~ supercritical coal plant, as opposed to a traditional ~~one this increases the 33% to 40% and would~~ decrease [[waste heat]] produced by 25%, and cut pollution and CO<sub>2</sub> by roughly the same amount.<ref name=coal/>		Improved efficiency corresponds to fewer [[greenhouse gas emission]]s, as well as [[pollutant]]s like [[NOx]], [[SOx]], and [[particulate matter]] which all cause adverse [[deaths per TWh\|health effects]]. A supercritical coal plant (as opposed to a traditional coal plant) will decrease [[waste heat]] produced by 25%, and cut pollution and CO<sub>2</sub> by roughly the same amount.<ref name=coal/>

			==For Further Reading==
			*[[Supercritical fluid]]
			*[[Thermal energy]]
			*[[Thermal efficiency]]
			*[[Coal fired power plant]]
			*[[Pollutant]]
			*Or explore a [[Special:Random\|random page]]

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

J.williams: 1 revision imported

2015-08-26T21:31:42Z

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J.williams at 17:00, 12 August 2015

2015-08-12T17:00:08Z

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[[Category:Done 2015-07-24]]
[[File:RDK_HW.jpg|350px|thumb|Figure 1. RDK-8, a supercritical coal plant in Germany achieves thermal efficiency of 46%.<Ref>Wikimedia Commons, Available: https://upload.wikimedia.org/wikipedia/commons/6/62/RDK_HW.jpg</ref>]]

<onlyinclude>'''Supercritical coal plants''' are a type of [[coal-fired power plant]] used in more modern designs. They differ from traditional coal power plants because the [[water]] running through it works as a [[supercritical fluid]], meaning it is neither a [[liquid]] or a [[gas]].</onlyinclude> This occurs when water reaches its [[critical point of water|critical point]] under high [[pressure]]s and [[temperature]]s, specifically at 22 [[pascal|MPa]] and 374[[Celsius|<sup>o</sup>C]].<ref name=bhe>Bright Hub engineering. (June 18 2015). ''What is a supercritical power plant?'' [Online], Available: http://www.brighthubengineering.com/power-plants/32893-what-is-a-supercritical-power-plant/</ref>

As a liquid approaches its critical point, its [[Thermal energy#Vaporization|latent heat of vaporization]] begins to decrease until it reaches zero at the critical point.<Ref name=bhe/> This means that the amount of [[energy]] needed to change the water into [[steam]] becomes less and less, and eventually the water's vaporization [[phase change]] is instant. This reduces the amount of [[heat transfer]] to the water that is normally needed in a conventional coal plant, which means that less [[coal]] needs to be used to heat an amount of water. This increases the plant's [[thermal efficiency]] by a considerable amount.<Ref name=bhe2>Bright Hub Engineering. (June 18 2015). ''How are Supercritical Boilers different from Subcritical Boilers?'' [Online], Available: http://www.brighthubengineering.com/power-plants/32896-how-are-supercritical-boilers-different-from-subcritical-boilers/</ref>

===Efficiency===
These plants are the standard for new coal power plants, as their efficiencies can reach around 44%, compared to older coal power plants that operate around 33%. Even higher pressure and temperature power plants are under research and development, known as '''ultra-supercritical''', potentially reaching an efficiency of near 50%.<ref name=coal>World Coal Association. (June 18 2015). ''Improving efficiencies'' [Online], Available: http://www.worldcoal.org/coal-the-environment/coal-use-the-environment/improving-efficiencies/</ref>

Improved efficiency corresponds to fewer [[greenhouse gas emission]]s, as well as [[pollutant]]s like [[NOx]], [[SOx]], and [[particulate matter]] which all cause adverse [[deaths per TWh|health effects]]. When choosing to build a supercritical coal plant, as opposed to a traditional one this increases the 33% to 40% and would decrease [[waste heat]] produced by 25%, and cut pollution and CO<sub>2</sub> by roughly the same amount.<ref name=coal/>

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