Rolling bed dryers are used for efficiently processing large amounts of material that need their respective moisture levels reduced. Rolling bed dryers are most often used for drying wood chips and organic residues and are most often utilized in the

biomass Biomass is plant-based material used as a fuel for heat or electricity production. It can be in the form of wood, wood residues, energy crops, agricultural residues, and waste from industry, farms, and households. Some people use the terms bi ...

, waste/

recycling Recycling is the process of converting waste materials into new materials and objects. The recovery of energy from waste materials is often included in this concept. The recyclability of a material depends on its ability to reacquire the p ...

, wood particle board, pellet, and

biofuel Biofuel is a fuel that is produced over a short time span from biomass, rather than by the very slow natural processes involved in the formation of fossil fuels, such as oil. According to the United States Energy Information Administration (E ...

industries.

General concept

The versatility of the rolling bed dryer is based on its simple idea of product circulation. The biomass processed through the rolling bed dryer can be not only efficiently dried but also has the option of being cleaned simultaneously. This provides for efficiency and conservation in energy which results in lower production costs. Biomass is being increasingly used as an alternative fuel source. Providing for this demands innovative solutions.

Applications

*Wood chips *Cropped biomass *Alternative fuels *Sugar beets pulp *Bush reaping *Greenery cut *Trimmings *Green waste

Process

Large bulks of biomass is permanently circulated and mixed by highly effective paddles. This basic idea combines the flow of large bulks of product good heat transfer with continuous movement of the product for even drying results. The drying air is supplied through a perforated plate under the moving bulk of product. Depending on the amount of ventilation., it is possible to separate fine materials such as dust, fibers, and sand from the bulk material collecting this separately alongside the ongoing drying process. This simultaneous cleaning occurs through the use of the material against itself to remove, separate, and collect fine materials such as fibers, sand and dust from the drying bulk material. Having this occur at the same time as the drying process saves not only time and energy, but also maintains better the caloric value of the residual biomass and reduces ash content. After the drying process is completed the dried output is suitable for direct firing and

pelletizing Pelletizing is the process of compressing or molding a material into the shape of a pellet. A wide range of different materials are pelletized including chemicals, iron ore, animal compound feed, plastics, waste materials, and more. The process ...

/briquetting as well as for more demanding processes such as

gasification Gasification is a process that converts biomass- or fossil fuel-based carbonaceous materials into gases, including as the largest fractions: nitrogen (N2), carbon monoxide (CO), hydrogen (H2), and carbon dioxide (). This is achieved by reacting ...

torrefaction Torrefaction of biomass, e.g., wood or grain, is a mild form of pyrolysis at temperatures typically between 200 and 320 °C. Torrefaction changes biomass properties to provide a better fuel quality for combustion and gasification applications. ...

of biomass.

References

{{reflist

External links

Video of rolling bed dryer in action
Industrial equipment Dryers

General concept

Applications

Process

See also

References

External links