Gasification: Difference between revisions

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Allothermal/ indirect fluidized beds can have different combinations of fluidization types in the two beds, such as two stationary fluidized bed reactors, one stationary fluidized bed gasifier and circulating bed combustor, one circulating fluidized bed gasifier and one stationary bed combustor or two circulating fluidized beds. Indirect double fluidized beds function in the same way as a fluidized bed, the difference being that there is no oxidant, instead typically steam is added to the gasifier, since the energy required is instead provided by hot sand bed material being transferred at high rate from the second, combustor bed.

==== Plasma Arc Gasification ====

Plasma arc gasification (PAG) is essentially the same as [[gasification]] except that waste is heated to much higher temperatures (between 1000-5000°C). This is achieved by the use of a plasma arc which is an electrical device made by passing gas through an electrical spark. The plasma arc melts the waste which turns into a vapour. The simple organic materials cool back down into reasonably clean gases (known as the [[syngas]]) and metals and other inorganic wastes fuse together and cool back into solids (known as the vitrified solid waste or slag). The [[syngas]] is piped away and used to generate energy and the slag material is used as an [[Aggregates|aggregate]] or disposed of. A portion of the [[syngas]] produced provides energy for on site turbines which power the electrical arc and so supporting a self-sustaining electrical power system. <ref>[https://www.explainthatstuff.com/plasma-arc-recycling.html Plasma Arc Recycling]</ref>

==References==

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 [[File:Allothermal gasifiers.png|400px|right|Different allothermal gasifiers: a)double bed indirect gasifier and b)indirect heat fluidised bed gasifier. All rights reserved.]]
 Allothermal/ indirect fluidized beds can have different combinations of fluidization types in the two beds, such as two stationary fluidized bed reactors, one stationary fluidized bed gasifier and circulating bed combustor, one circulating fluidized bed gasifier and one stationary bed combustor or two circulating fluidized beds. Indirect double fluidized beds function in the same way as a fluidized bed, the difference being that there is no oxidant, instead typically steam is added to the gasifier, since the energy required is instead provided by hot sand bed material being transferred at high rate from the second, combustor bed.
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+==== Plasma Arc Gasification ====
+[[File:Plasma Arc.png|150px|right|Plasma Arc Gasification Unit. All rights reserved.]]
+Plasma arc gasification (PAG) is essentially the same as [[gasification]] except that waste is heated to much higher temperatures (between 1000-5000°C). This is achieved by the use of a plasma arc which is an electrical device made by passing gas through an electrical spark. The plasma arc melts the waste which turns into a vapour. The simple organic materials cool back down into reasonably clean gases (known as the [[syngas]]) and metals and other inorganic wastes fuse together and cool back into solids (known as the vitrified solid waste or slag). The [[syngas]] is piped away and used to generate energy and the slag material is used as an [[Aggregates|aggregate]] or disposed of. A portion of the [[syngas]] produced provides energy for on site turbines which power the electrical arc and so supporting a self-sustaining electrical power system. <ref>[https://www.explainthatstuff.com/plasma-arc-recycling.html Plasma Arc Recycling]</ref>
+<br clear=all />
 ==References==
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