At CWF, we often use the term "qualified Pellet." It is defined as the conversion of any kind of biomass into pellets, not just wood. The reason we need to clarify this concept the term "qualified pellet" refers to those burning with very little ash rested, such as: only 0.3%. We define" qualified "from both mechanical durability and moisture content.
Mechanical durability refers to the density of a pellets and how it is shaped. If the density of the wood pellets is greater, it is of course stronger, so that it can better withstand the shocks that are experienced during transportation, and in the furnace, the combustion efficiency is higher. After grinding , the surface should be very smooth, with little or no cracks. If the pellets crack or swell, it is due to excessive internal moisture, or due to unsuccessful compression during grinding. The length of the particles is not very important. However, if the particles are too long (greater than 1 inch), it can damage the auger in the furnace.
The smaller the moisture is in the pellets, the greater the energy is released when they burn. However, a certain amount of moisture is also required during the manufacture of the granules. Therefore, our goal is: the lower the moisture control, the better, but we also need to maintain a certain amount of moisture support particle production. In the finished product, the target humidity is less than 10%. Particles with a humidity of more than 10% can also burn, but they are inefficient.
The easiest way to measure uality is to place the pellets in a cup of water. If it sinks, prove that the density is high enough and the pressure on the shape is sufficient. However, if the particles float on the surface of the water, the density is very low and the quality is poor. From a mechanical point of view, its durability is very poor and it is very easy to crush or become fine.