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Pellet production - production of pelletsPellets are often made by sawmills or planers because they produce a larger amount of wood left over from the production of pellets.
For a ton of pellets about seven cubic meters of wood chips are needed.
The production of pellets
Many sawmills have a transport device that automatically transports the sawdust from where it is produced for further processing in the press. There, the wood chips are freed from foreign substances before processing and dried. Then they are transported with a screw conveyor to the pellet press and pressed through a die with many holes. The pressing process generates heat and the lignin contained in the wood sticks the cellulose fibers together. This normally requires no binder, but may be mixed up to a maximum of two percent. Possible binders are, for example, corn or potato starch or flour, but they are usually not mixed or only in small amounts in order to increase the abrasion resistance of the pellets. Behind the die, the pellets are cut with knives to the desired size, thereby obtaining their cylindrical shape. They are then screened to remove fines such as leftover sawdust and then stored after cooling, or loaded directly into silo wagons, which they deliver to customers.
Good quality pellets
This makes pellets a good one
Heat output, they must be very tightly pressed, only one
contain low residual moisture and should have little abrasion. Two quality seals that guarantee this are the DINplus and ENplus standards. It specifies requirements for size and density, abrasion resistance, calorific value and other features that ensure trouble-free operation of the pellet heating system. In addition to such a seal of quality, a good quality can be recognized by the fact that the pellets are smooth, have no cracks and shine easily. Of particular importance is the moisture content of the pellets, as it depends on the calorific value. Therefore, these standards set a content of less than ten percent, whereby the calorific value of one kilo of pellets is about the same as half a liter of heating oil or half a cubic meter of natural gas. Also, the resulting ash is interesting for the consumer, so it is in pellets with quality seal below 1.5 percent.
Pellets have the advantage that the fuel does not have long transport routes, as is the case with crude oil and natural gas. They are made from waste products of the wood industry and are a renewable resource. As a result, the fuel will not go out in the future, so that a supply is guaranteed. At the moment, many more pellets are produced than used, so prices are stable too. Pellets contain no chemical additives and therefore burn in an environmentally friendly way. Also, the energy needed to make it is much less than that needed to provide other fuels.