Moisture Content: Difference between revisions
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[[Category:Tonnage & Waste Types]] | [[Category:Tonnage & Waste Types]] | ||
Moisture Content is generally used as a key component to describe the water present in [[WDF]] which in turn affects the quality and energy content of the [[WDF]]. The impact on the energy value or [[NCV]] is a key factor in determining the ability of an [[ | Moisture Content is generally used as a key component to describe the water present in [[WDF]] which in turn affects the quality and energy content of the [[WDF]]. The impact on the energy value or [[NCV]] is a key factor in determining the ability of an [[EfW]] facility being able to receive the material and the [[Gate Fee]] that is charged<ref name="foo">WRAP, 2019. [http://www.wrap.org.uk/sites/files/wrap/WDF_Classification_6P%20pdf.pdf. A Classification Scheme to Define the Quantity of Waste Derived Fuels. Wrap.org.uk.] [online] [Accessed 1 Nov. 2019]</ref>. | ||
The heating value of the fuel or [[NCV]] decreases with increased Moisture Content, in simple terms the higher the moisture the lower the [[NCV]]. In addition, Moisture Content is an important parameter as: higher Moisture Content increases the volume of [[Flue Gas]] produced per energy unit, requiring larger waste heat boilers and [[Flue Gas]] cleaning equipment; | The heating value of the fuel or [[NCV]] decreases with increased Moisture Content, in simple terms the higher the moisture the lower the [[NCV]]. In addition, Moisture Content is an important parameter as: higher Moisture Content increases the volume of [[Flue Gas]] produced per energy unit, requiring larger waste heat boilers and [[Flue Gas]] cleaning equipment; | ||
* high Moisture Content will reduce the combustion temperature, changing the combustion properties which may in turn lead to in higher emissions if the combustion cannot be appropriately adjusted | * high Moisture Content will reduce the combustion temperature, changing the combustion properties which may in turn lead to in higher emissions if the combustion cannot be appropriately adjusted | ||
* it will influence the behaviour of the waste during the primary conversion stage in a [[Gasification]]/[[Pyrolysis]] plant and will also impact on the properties and quality of the [[Syngas]] produced. | * it will influence the behaviour of the waste during the primary conversion stage in a [[Gasification]]/[[Pyrolysis]] plant and will also impact on the properties and quality of the [[Syngas]] produced<ref name="foo" />. | ||
The table below shows how waste derived fuels can be classified depending on moisture content <ref | The table below shows how waste derived fuels can be classified depending on moisture content<ref name="foo" />. | ||
{|class=wikitable | |||
!Classification Property!! style='text-align:center;' |Unit !! style='text-align:center;' |Class 1 !! style='text-align:center;' |Class 2 !! style='text-align:center;' |Class 3 !! style='text-align:center;' |Class 4 !! style='text-align:center;' |Class 5 | |||
|- | |||
|Moisture Content (as received)||style='text-align:center;' |% wt/wt (mean)|| style='text-align:center;' |<=10||style='text-align:center;' |<=15||style='text-align:center;' |<=20||style='text-align:center;' |<=30||style='text-align:center;' |<40 | |||
|}<ref name="foo" /> | |||
==References== | |||
<references /> | |||
Latest revision as of 11:44, 28 November 2019
Moisture Content is generally used as a key component to describe the water present in WDF which in turn affects the quality and energy content of the WDF. The impact on the energy value or NCV is a key factor in determining the ability of an EfW facility being able to receive the material and the Gate Fee that is charged[1].
The heating value of the fuel or NCV decreases with increased Moisture Content, in simple terms the higher the moisture the lower the NCV. In addition, Moisture Content is an important parameter as: higher Moisture Content increases the volume of Flue Gas produced per energy unit, requiring larger waste heat boilers and Flue Gas cleaning equipment;
- high Moisture Content will reduce the combustion temperature, changing the combustion properties which may in turn lead to in higher emissions if the combustion cannot be appropriately adjusted
- it will influence the behaviour of the waste during the primary conversion stage in a Gasification/Pyrolysis plant and will also impact on the properties and quality of the Syngas produced[1].
The table below shows how waste derived fuels can be classified depending on moisture content[1].
| Classification Property | Unit | Class 1 | Class 2 | Class 3 | Class 4 | Class 5 |
|---|---|---|---|---|---|---|
| Moisture Content (as received) | % wt/wt (mean) | <=10 | <=15 | <=20 | <=30 | <40 |
References
- ↑ 1.0 1.1 1.2 1.3 WRAP, 2019. A Classification Scheme to Define the Quantity of Waste Derived Fuels. Wrap.org.uk. [online] [Accessed 1 Nov. 2019]