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Difference between revisions of "Sizing"
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{{Infobox technology | {{Infobox technology | ||
| Feedstock = straws, wood, wastes | | Feedstock = straws, wood, wastes | ||
| Product = | | Product =Flowable small-sized biomass | ||
|Name= Sizing}} | |Name= Sizing|Category=Pre-processing}} | ||
<onlyinclude>'''Sizing''' is a mechanical process to change the size of a material to use it in a conversion process. This normally means that a base feedstock with bigger parts is reduced to smaller pieces. Sizing includes chipping and grinding as base technologies.<!-- Sizing is a mechanical process that aims to reduce the particle size and crystallinity and increase the specific surface area of biomass to promote the degradation of substrate. (Stanislaus et al., 2018) This to eliminate mass and heat transfer limitation during the required reaction. It is a very efficient technique, but a major drawback is the high energy input. (Moodley P., Trois C., 2021) --></onlyinclude> | <onlyinclude>'''Sizing''' is a mechanical process to change the size of a material to use it in a conversion process. This normally means that a base feedstock with bigger parts is reduced to smaller pieces, which makes the biomass easier to handle and allows it to flow. Sizing includes chipping and grinding as base technologies.<!-- Sizing is a mechanical process that aims to reduce the particle size and crystallinity and increase the specific surface area of biomass to promote the degradation of substrate. (Stanislaus et al., 2018) This to eliminate mass and heat transfer limitation during the required reaction. It is a very efficient technique, but a major drawback is the high energy input. (Moodley P., Trois C., 2021) --></onlyinclude> | ||
== Feedstock == | == Feedstock == | ||
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=== Pre-treatment === | === Pre-treatment === | ||
Sizing is often performed as a first step in the process and requires no other pre-treatment. It is, however, not uncommon to first perform a coarse grinding before further grinding the biomass into smaller particles. | |||
== Process and technologies<!-- Milling, grinding, chipping and extrusion -->== | == Process and technologies<!-- Milling, grinding, chipping and extrusion -->== | ||
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=== Chipping === | === Chipping === | ||
For chipping normally a chipper machine is used that consists of sharp cutting knives, that slice bigger parts into smaller chips. This is used e.g. for wood materials, straws, mixed garden residues and other feedstock that can be | For chipping normally a chipper machine is used that consists of sharp cutting knives, that slice bigger parts into smaller chips. This is used e.g. for wood materials, straws, mixed garden residues and other feedstock that can be cut by a knife. Chippers are susceptible to knife wear from high soil content, metal contamination, rocks and stone, so the base feedstock normally needs to be cleaned before chipping.<!-- The size of the resulting materials is typically 10–30 mm after chipping. --> | ||
=== Grinding === | === Grinding === | ||