Biomass wood ball fuel wood coal ball
Application: heating system
About wood ball fuel
Wood pellets are porous solid, with high or low moisture content. The moisture content has great effect
on the thermo-chemical conversion of the wood pellets. Therefore, moisture content is one of the basic
indicators to identify the wood pellet quality. Over-high moisture content will influence the calorific
value and heat efficiency. According to ENplus standard, the moisture content of qualified wood pellets
should be lower than 10%.
Ash refers to residues after full combustion of wood pellets, generated by the complex reactions such as
decomposition and combination of all combustible matters and minerals in wood pellets. Ash content and
impurities in the wood pellets have great effect on the coking of boilers. According to ENplus standard,
wood pellets fall into 3 grades according to the ash content. The grade A1 has the ash content lower than
0.7%, A2 lower than 1.5%, and grade B lower than 3%.
Volatiles are the decomposed and precipitated organic matters generated under high heat, when the wood
pellets burn in isolation from the air. Usually, the higher the volatiles content, the better the
The fixed carbon is the residues of wood pellets with the moisture, ash and volatiles removed. The same
as ash, fixed carbon is a thermal decomposition product, not a inherent content in biomass pellets. Fixed
carbon contains not only carbon, but also hydrogen, oxygen, nitrogen, sulfur, etc.The lower the fixed
carbon content, the easier the wood pellets burns, and the less carbon emission.
Wood pellet calorific value includes net calorific value and gross calorific value. The units are Mg/kg.
Gross calorific value (Qgr) refer to all heat generated by the full combustion of 1kg wood pellets,
including the latent heat of vaporization when the water vapor in smoke condenses into water. Net
calorific value(Qnet) equals the gross calorific value deducts the latent heat of vaporization. In the
transaction and use of wood pellets, people usually adopt net calorific value as the measure of calorific