Biomass Wood Pellet Maker Machine

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Drying is one of the key preprocess of wood pellet making. Besides a wood pellet maker machine, a dryer machine is needed to prepare the raw material available for pelletizing. If you want to set up a wood pellet line, dryers and pellet maker machines may be the most expensive and energy intensive pieces of machine. Rotary drum dryers have relatively low cost and simple operation procedures. They have a tumbler which continually exposes the green material to hot air. Suspension dryers are less economical but have a smaller footprint in the work area, so are worthwhile for smaller facilities.

Table 6: Variable pellet making costs with wet and dry raw materials

Dryer energy consumption is minimized by using an efficient thermal energy source, such as a biomass wood material, to dry the green material. In other words, the dryer need not be connected to the local electric grid to draw energy; existing biomass feedstock may be burned to produce the required heat. Using wood creates economies of scope associated with an wood pellet maker machine or wood pellet plant. Dust collected after the pelletizing process and during the bagging process can be recycled in the drying system. In an integrated biomass campus, waste products from other processes such as dried wood chips, sawdust, shavings, wood flour, wood waste could be used as dryer feedstock. Many manufacturers are capable of supplying wood pellet maker machines and dryers capable of firing with a variety of biomass sources, especially woody biomass.

The moisture content of agricultural biomass, in contrast, is typically low. Straw delivered to the wood pallet maker machine or pellet production plant generally consists of air-dried bales, with a moisture content of between 15 and 20 percent. Compare this with wet sawdust which may register a moisture content of 50 to 60 percent. As the moisture content of straw and wood pellets after pelletizing is 7 to 12 percent, if straw material is used for pellet maker machine there is limited need for drying. Some agricultural biomass feedstock will require a more elaborate drying process, for example reed canary grass. With small-scale pellet production, costs are likely to dictate either batch perforated-floor technology using heated air, or a simple band conveyor using exhaust gas or heated air. It is only at mid-scale pellet production and above that a rotary dryer will come into play.

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