Dry scrubber - Revision history

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energy>Jmdonev at 21:20, 3 July 2026

2026-07-03T21:20:42Z

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	[[Category:Done ~~2018~~-08-03]]		[[Category:Done 2026-08-01]]
	[[File:Elektrofilter_Maria_Gugging.jpg\|360px\|thumb\|right\|Figure 1. An electrostatic precipitator is one type of dry scrubber.<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 is one type of dry scrubber.<ref>Wikimedia Commons. (July 15, 2015). ''Electrostatic Precipitator'' [Online]. Available: https://upload.wikimedia.org/wikipedia/commons/c/c4/Elektrofilter_Maria_Gugging.jpg</ref>]]
	<onlyinclude>A '''dry scrubber''' or '''dry scrubber system''' is one type of [[scrubber]] that is used to remove harmful materials from industrial exhaust [[gas\|gases]] before they are released into the [[environment]]. Dry scrubbers are the type most commonly used in plants today, and they utilize a collection of dry substances to remove [[acid\|acidic]] gases that contribute to [[acid rain]].</onlyinclude><ref name="oxford dic">A. Atkins and M. Escudier, A dictionary of mechanical engineering. Oxford: Oxford University Press, 2013.</ref>		<onlyinclude>A '''dry scrubber''' or '''dry scrubber system''' is one type of [[scrubber]] that is used to remove harmful materials from industrial exhaust [[gas\|gases]] before they are released into the [[environment]]. Dry scrubbers are the type most commonly used in plants today, and they utilize a collection of dry substances to remove [[acid\|acidic]] gases that contribute to [[acid rain]].</onlyinclude><ref name="oxford dic">A. Atkins and M. Escudier, A dictionary of mechanical engineering. Oxford: Oxford University Press, 2013.</ref>

	Dry scrubbers work similarly to other scrubbers. The system sprays a collection of dry reagents into an exhaust stream. These chemicals can react differently depending on which material they are specifically targeting for removal. Some of these materials neutralize harmful [[pollutant]]s in the stream through a [[chemical]] reaction, while others cause a material to react and turn into a different substance. That substance then falls out of the gas stream or is caught in a particle screen.		Dry scrubbers work similarly to many other scrubbers. The system sprays a collection of dry reagents into an exhaust stream. These chemicals can react differently depending on which material they are specifically targeting for removal. Some of these materials neutralize harmful [[pollutant]]s in the stream through a [[chemical]] reaction, while others cause a material to react and turn into a different substance. That substance then falls out of the gas stream or is caught in a particle screen.

	==Use==		==Use==
	Dry scrubbers ~~are used~~ mainly to remove acid gases from combustion sources. Generally, this is done by introducing a series of dry reactants to exhaust gas at high speeds. This neutralizes the pollutants in the gas. This task is done in three steps: ''gas cooling'', ''reagent injection'', and ''filtering.''<ref name = "INST">Institute.unido.org, 2018. [Online]. Available: https://institute.unido.org/wp-content/uploads/2014/11/25.-Air-Pollution-Control-Technologies-Compendium.pdf. [Accessed: 26- Jul- 2018].</ref>		Dry scrubbers mainly remove acid gases from combustion sources. Generally, this is done by introducing a series of dry reactants to exhaust gas at high speeds. This neutralizes the pollutants in the gas. This task is done in three steps: ''gas cooling'', ''reagent injection'', and ''filtering.''<ref name = "INST">Institute.unido.org, 2018. [Online]. Available: https://institute.unido.org/wp-content/uploads/2014/11/25.-Air-Pollution-Control-Technologies-Compendium.pdf. [Accessed: 26- Jul- 2018].</ref>
	First, gas cooling must be done to prepare exhaust gases. In the gas cooling system, [[emission]] gases are cooled to make it easier to remove pollutants and other toxins from the gas. The exhaust gas is diluted using an evaporative cooler.<ref name="INST"/> Once the gas has been significantly cooled the reagent injection can begin. It is in this step that the harmful components are actually removed from the gas. Components of the dry reagent are generally chosen because of their neutralizing properties, thus sodium bicarbonate is frequently included. A variety of powders are mixed together and fired at high [[pressure]]s into the exhaust gas. Chemical reactions occur that reduce the acidity of the gas and remove harmful pollutants. The final step is using a fabric filter to capture the used scrubbing powder as the cleaned gas exits the scrubbing chamber. This spent powder can sometimes be cleansed and reused for dry scrubbing, but frequently it must be disposed since it cannot be properly washed.		First, gas cooling must be done to prepare exhaust gases. In the gas cooling system, [[emission]] gases are cooled to make it easier to remove pollutants and other toxins from the gas. The exhaust gas is diluted using an evaporative cooler.<ref name="INST"/> Once the gas has been significantly cooled the reagent injection can begin. It is in this step that the harmful components are actually removed from the gas. Components of the dry reagent are generally chosen because of their neutralizing properties, thus sodium bicarbonate is frequently included. A variety of powders are mixed together and fired at high [[pressure]]s into the exhaust gas. Chemical reactions occur that reduce the acidity of the gas and remove harmful pollutants. The final step is using a fabric filter to capture the used scrubbing powder as the cleaned gas exits the scrubbing chamber. This spent powder can sometimes be cleansed and reused for dry scrubbing, but frequently it must be disposed since it cannot be properly washed.

Jmdonev: 1 revision imported

2018-09-03T22:23:37Z

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energy>Jmdonev at 03:02, 13 August 2018

2018-08-13T03:02:55Z

← Older revision		Revision as of 03:02, 13 August 2018
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	[[Category:Done ~~2015~~-07-24]]		[[Category:Done 2018-08-03]]
	<onlyinclude>A '''dry scrubber''' or '''dry scrubber system''' is one type of [[scrubber]] that is used to remove harmful materials from industrial exhaust [[gas\|gases]] before they are released into the [[environment]]. Dry scrubbers are the type most commonly used in plants today, and they utilize a collection of dry substances to remove [[acid\|acidic]] gases that contribute to [[acid rain]].</onlyinclude><ref name="~~RE1~~">~~WiseGeek~~. ~~(July 14~~, ~~2015)~~. ~~''What is a Scrubber System?'' [Online]. Available~~: ~~http://www.wisegeek.com/what-is-a-scrubber-system~~.~~htm~~</ref>		[[File:Elektrofilter_Maria_Gugging.jpg\|360px\|thumb\|right\|Figure 1. An electrostatic precipitator is one type of dry scrubber.<ref>Wikimedia Commons. (July 15, 2015). ''Electrostatic Precipitator'' [Online]. Available: https://upload.wikimedia.org/wikipedia/commons/c/c4/Elektrofilter_Maria_Gugging.jpg</ref>]]
			<onlyinclude>A '''dry scrubber''' or '''dry scrubber system''' is one type of [[scrubber]] that is used to remove harmful materials from industrial exhaust [[gas\|gases]] before they are released into the [[environment]]. Dry scrubbers are the type most commonly used in plants today, and they utilize a collection of dry substances to remove [[acid\|acidic]] gases that contribute to [[acid rain]].</onlyinclude><ref name="oxford dic">A. Atkins and M. Escudier, A dictionary of mechanical engineering. Oxford: Oxford University Press, 2013.</ref>

	Dry scrubbers work similarly to other scrubbers. The system sprays a collection of dry reagents into an exhaust stream. These chemicals can react differently depending on which material they are specifically targeting for removal. Some of these materials neutralize harmful [[pollutant]]s in the stream through a [[chemical]] reaction, while others cause a material to react and turn into a different substance. That substance then falls out of the gas stream or is caught in a particle screen. ~~Since no [[water vapour\|vapour]] is added in this process, the treated exhaust gases are typically dark or invisible when vented.<ref name="RE1"/>~~		Dry scrubbers work similarly to other scrubbers. The system sprays a collection of dry reagents into an exhaust stream. These chemicals can react differently depending on which material they are specifically targeting for removal. Some of these materials neutralize harmful [[pollutant]]s in the stream through a [[chemical]] reaction, while others cause a material to react and turn into a different substance. That substance then falls out of the gas stream or is caught in a particle screen.

	==Use==		==Use==
	Dry scrubbers are used mainly to remove acid gases from combustion sources. Generally, this is done by introducing a series of dry reactants to exhaust gas at high speeds. This neutralizes the pollutants in the gas. This task is done in three steps: gas cooling, reagent injection, and filtering.<ref name="~~RE2~~">~~WiseGeek~~. ~~(July 15~~, ~~2015)~~. ~~''What is a Dry Scrubber?''~~ [Online]. Available: ~~http~~://~~www~~.~~wisegeek~~.~~com~~/~~what~~-is-a-~~dry~~-~~scrubber~~.~~htm~~</ref>		Dry scrubbers are used mainly to remove acid gases from combustion sources. Generally, this is done by introducing a series of dry reactants to exhaust gas at high speeds. This neutralizes the pollutants in the gas. This task is done in three steps: ''gas cooling'', ''reagent injection'', and ''filtering.''<ref name = "INST">Institute.unido.org, 2018. [Online]. Available: https://institute.unido.org/wp-content/uploads/2014/11/25.-Air-Pollution-Control-Technologies-Compendium.pdf. [Accessed: 26- Jul- 2018].</ref>
			First, gas cooling must be done to prepare exhaust gases. In the gas cooling system, [[emission]] gases are cooled to make it easier to remove pollutants and other toxins from the gas. The exhaust gas is diluted using an evaporative cooler.<ref name="INST"/> Once the gas has been significantly cooled the reagent injection can begin. It is in this step that the harmful components are actually removed from the gas. Components of the dry reagent are generally chosen because of their neutralizing properties, thus sodium bicarbonate is frequently included. A variety of powders are mixed together and fired at high [[pressure]]s into the exhaust gas. Chemical reactions occur that reduce the acidity of the gas and remove harmful pollutants. The final step is using a fabric filter to capture the used scrubbing powder as the cleaned gas exits the scrubbing chamber. This spent powder can sometimes be cleansed and reused for dry scrubbing, but frequently it must be disposed since it cannot be properly washed.

	~~First~~, ~~gas cooling must be done to prepare exhaust gases. In~~ the ~~gas cooling system, [[emission]] gases are cooled~~ to ~~make~~ it ~~easier to remove pollutants and other toxins from~~ the ~~gas~~. The exhaust gas is ~~diluted using an evaporative cooler.<ref name="RE2"/> Once the gas has been significantly cooled the reagent injection can begin. It is in this step that the harmful components are actually removed~~ from the ~~gas~~. ~~Components of the dry reagent~~ are ~~generally chosen~~ because of ~~their neutralizing properties - thus sodium bicarbonate~~ is ~~frequently included. A variety of powders are mixed together and fired at high [[pressure]]s~~ into the exhaust ~~gas. Chemical reactions occur that reduce~~ the ~~acidity~~ of the ~~gas and remove harmful pollutants. The final step~~ is ~~using~~ a ~~fabric~~ filter ~~to capture the used scrubbing powder as the cleaned gas exits the scrubbing chamber~~. ~~This spent powder can sometimes be cleansed and reused for~~ dry ~~scrubbing~~, ~~but frequently it must be disposed of since it cannot be properly washed~~.		==Advantages and Disadvantages==
			Dry scrubbing has been embraced widely, and one of the biggest advantages to using it is the positive environmental impact. The removal of hazardous substances from exhaust gas is important as it prevents a large number of pollutants from escaping into the air. Dry scrubbers are also more commonly used than wet scrubbers mainly because they produce comparatively little waste material. Most of this material that is sprayed into the exhaust is burned off in the heat of the stream or is caught in a filter. The use of dry scrubbers is less expensive as there is no associated cost with removing, transporting, and storing waste water from wet scrubbers.<ref name="INST"/>

	~~==Advantages and Disadvantages==~~		One disadvantage of dry scrubbing is the residual waste powder that must be disposed of because it is a hazardous material. This waste must be handled by specialists because of its chemical makeup. Another disadvantage is that the process of scrubbing is expensive. The final disadvantage to using a dry scrubber is that they cannot remove ''all'' contaminants from the gas.<ref name="INST"/>
	~~Dry~~ scrubbing ~~has been embraced widely, and one of the biggest advantages to using it~~ is the ~~positive environmental impact. The removal~~ of ~~hazardous substances from exhaust gas~~ is ~~important as it prevents~~ a ~~large number of pollutants from escaping into the air~~. ~~Dry scrubbers are also more commonly used than wet scrubbers mainly~~ because ~~they produce comparatively little waste material~~. ~~Most of this material~~ that ~~is sprayed into the exhaust is burned off in~~ the ~~heat~~ of ~~the stream or~~ is ~~caught in a filter~~. The ~~use of~~ dry ~~scrubbers~~ is ~~less expensive as there is no associated cost with removing, transporting, and storing waste water~~ from ~~wet scrubbers~~.<ref name="~~RE1~~"/>

	One disadvantage of dry scrubbing is the residual waste powder that must be disposed of because it is a hazardous material. This waste must be handled by specialists because of its chemical makeup. Another disadvantage is that the process of scrubbing is expensive. The final disadvantage to using a dry scrubber ~~is that they cannot remove ''all'' contaminants from the~~ gas~~. Currently, wet scrubbing is the only method that can be used to remove~~ [[~~mercury~~]]~~.<ref name="RE1"/>~~		==For Further Reading==
			*[[Scrubber]]
			*[[Wet scrubber]]
			*[[Exhaust gas]]
			*[[Pollutant]]
			*[[Electrostatic precipitator]]
			*[[Cyclone separator]]
			*Or explore a [[Special:Random\|random page]]

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

			<!--
			Someone made the claim below. It's an interesting claim, that Jason thinks is probably true, but no one can find a source for it. Jason (Aug 12, 2018)
			Since no [[water vapour\|vapour]] is added in this process, the treated exhaust gases are typically dark or invisible when vented. ('''CAN'T FIND THIS INFO''')
			-->

J.williams: 1 revision imported

2015-08-26T21:31:00Z

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J.williams at 16:53, 12 August 2015

2015-08-12T16:53:07Z

New page

[[Category:Done 2015-07-24]]
<onlyinclude>A '''dry scrubber''' or '''dry scrubber system''' is one type of [[scrubber]] that is used to remove harmful materials from industrial exhaust [[gas|gases]] before they are released into the [[environment]]. Dry scrubbers are the type most commonly used in plants today, and they utilize a collection of dry substances to remove [[acid|acidic]] gases that contribute to [[acid rain]].</onlyinclude><ref name="RE1">WiseGeek. (July 14, 2015). ''What is a Scrubber System?'' [Online]. Available: http://www.wisegeek.com/what-is-a-scrubber-system.htm</ref>

Dry scrubbers work similarly to other scrubbers. The system sprays a collection of dry reagents into an exhaust stream. These chemicals can react differently depending on which material they are specifically targeting for removal. Some of these materials neutralize harmful [[pollutant]]s in the stream through a [[chemical]] reaction, while others cause a material to react and turn into a different substance. That substance then falls out of the gas stream or is caught in a particle screen. Since no [[water vapour|vapour]] is added in this process, the treated exhaust gases are typically dark or invisible when vented.<ref name="RE1"/>

==Use==
Dry scrubbers are used mainly to remove acid gases from combustion sources. Generally, this is done by introducing a series of dry reactants to exhaust gas at high speeds. This neutralizes the pollutants in the gas. This task is done in three steps: gas cooling, reagent injection, and filtering.<ref name="RE2">WiseGeek. (July 15, 2015). ''What is a Dry Scrubber?'' [Online]. Available: http://www.wisegeek.com/what-is-a-dry-scrubber.htm</ref>

First, gas cooling must be done to prepare exhaust gases. In the gas cooling system, [[emission]] gases are cooled to make it easier to remove pollutants and other toxins from the gas. The exhaust gas is diluted using an evaporative cooler.<ref name="RE2"/> Once the gas has been significantly cooled the reagent injection can begin. It is in this step that the harmful components are actually removed from the gas. Components of the dry reagent are generally chosen because of their neutralizing properties - thus sodium bicarbonate is frequently included. A variety of powders are mixed together and fired at high [[pressure]]s into the exhaust gas. Chemical reactions occur that reduce the acidity of the gas and remove harmful pollutants. The final step is using a fabric filter to capture the used scrubbing powder as the cleaned gas exits the scrubbing chamber. This spent powder can sometimes be cleansed and reused for dry scrubbing, but frequently it must be disposed of since it cannot be properly washed.

==Advantages and Disadvantages==
Dry scrubbing has been embraced widely, and one of the biggest advantages to using it is the positive environmental impact. The removal of hazardous substances from exhaust gas is important as it prevents a large number of pollutants from escaping into the air. Dry scrubbers are also more commonly used than wet scrubbers mainly because they produce comparatively little waste material. Most of this material that is sprayed into the exhaust is burned off in the heat of the stream or is caught in a filter. The use of dry scrubbers is less expensive as there is no associated cost with removing, transporting, and storing waste water from wet scrubbers.<ref name="RE1"/>

One disadvantage of dry scrubbing is the residual waste powder that must be disposed of because it is a hazardous material. This waste must be handled by specialists because of its chemical makeup. Another disadvantage is that the process of scrubbing is expensive. The final disadvantage to using a dry scrubber is that they cannot remove ''all'' contaminants from the gas. Currently, wet scrubbing is the only method that can be used to remove [[mercury]].<ref name="RE1"/>

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