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There is very little information obtainable on the internet on the specifics of wood pellet manufacture. There is a lot of general knowledge of how the process works, on the other hand it is very light on detail. The reasons for this is easy, very few people have first hand experience of the process, plus how it actually works. The fact of the material is wood pellet production is a skilled process, and describing the process in a few works, go no where near to explaining the complexity as well as detail of the process. At PelHeat we manufacture small biomass pellet mills, plus to improve general knowledge of the process we have developed this guide.

Learn more about Pellet Mill

Pellet mills come in a range of different shapes along with sizes, including small pellet mills. There are a variety of dissimilar designs of pellet mills, along with some are more common than others in the design of small pellet mills. Also the size of the pellet mill can influence its ability to process various raw materials. Therefore a small pellet mill can struggle to make pellets out of certain materials, particularly high density materials, such as wood pellets as well as particularly hardwood pellets. The reasons most small pellet mills struggle to create biomass pellets, is they lack enough power to compress the biomass, in addition to they also do not generate sufficient heat to melt the biomass. As wood is a much harder matter than grass for example, either more power is required in terms of a larger motor, or a lower gearing. Biomass melting is crucial to the pellet process and pellet binding. Wood melts at a much higher temperature than straw, in addition to the friction generated in a small mill is usually insufficient to reach the required temperatures. Larger pellet mills have a larger contact area, which generates more friction, as well as thus heat. Also large pellet machines usually have steam conditioners to increase the temperature of the wood before it enters the pellet mill.

Read more about Pellets

There are two core principle designs of pellet mills, which is either a flat die or circle die design. Flat die pellet mills work on a perpendicular process design, by raw material entering from above plus dropping down into the process area. The die is horizontal, with a set of rollers rotating across the surface. As the raw material falls from above, the rollers compress the matter due to the die in a perpendicular motion. Flat die pellet mills are a much more well-liked design for small pellet mills, through their more straightforward design along with operation. To learn more about flat die pellet mills, their reward in addition to disadvantages, please click below to download the guide. Circle die pellet mills work in a unlike manor to flat die pellet mills. In a ring die pellet mill the die encompasses the rollers, hence the ‘disc’ description. The rollers apply pressure to the inner surface of the die, compressing matter due to the outer surface of the die. Matter is forced fed horizontally into the centre of the sphere, Pellets then fall vertically away from the disc. Small circle die pellet mills do exist, on the other hand they are not as accepted through their more complicated design plus higher costs. Though disc die pellet mills do have certain payback over flat die pellet mills.

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