The pellets or wood pellets
Called pellets or wood pellets according to the region, they are manufactured in "granulators" from sawdust (sawmill generally) is wood heating mode the most "fashionable" now.
For the record, their origin is (despite what you think) already "old" because their birth dates from the end of World War II in America. Indeed; it was then "get rid" of millions of tons of sawdust and millions of manufactured or accumulated during the war effort, US pallets.
Their height is 6 or 8 mm in diameter and their length to 1 3 times their diameter (see standards Pellets).
Contrary to what one might think their cohesion is achieved only by sintering (mechanical compression): no glue type binder or other additives!
Their humidity is less than 10%, manufacture therefore requires a rigorous drying but this is not the only step obviously. To learn more about the production of pellets, this is the diagram of a pellet manufacturing plant or wood pellets.
The pellets are usually sold "normalized" but remember to ask your provider because it is not systematic. Indeed; in 2009, there were, in France or in Belgium, mandatory standards to manufacture and sell pellets but it will evolve with Europe in the coming years to ensure consistent quality to consumers. The pellets are delivered either in bulk pellet boilers via a blower truck (requires specific storage silo with pellets) Or bag (usually of 15 kg) more convenient for pellet stoves.
There are (at least) 2 big advantages over wood logs: ash production is very low and their use is "automated" and one can see the ease of use of heating oil! The interested reader will read the complete file on the Heating with pellets by realization and presentation of the pellet boiler or visit our forum on wood heating.
The main disadvantage of pellets is that you need to equip a special device Pellets can generally burn THAT pellets. The pellets can still burn in a log burning stove provided to burn logs or sticks together.
Price and energy equivalent wafers
One tonne of pellets equivalent to about 500 liters of fuel oil and the storage volume is of the order of 3 4 times to the oil volume.
Here also the prices are very variable, they can be equivalent to the oil as being 50% cheaper, it depends on the time! The attentive reader will look carefully theComparative price developments Pellets in "real time" since 2006.
Learn more about wood pellets
- Read a complete dossier on the Heating with pellets by realization and presentation of the pellet boiler
- the properties and standards for wood pellets.
- Evolution of the price of pellets and comparison relative to oil, gas and electricity