When we describe a quality pellet or quality biomass pelleting machine, this is a term that describes pellets made from any biomass material, not just wood. The reason I'm stating this is because in the premium wood pellet market a quality pellet refers to a pellet with very low ash, for example 0.3%, but some of the pellets produced may be higher ash content. As a professional and reliable pelleting machine manufacturer, we supply all kinds of high quality biomass pelleting machine which produces the best biomass pellet production. We define a quality pellet through mechanical durability and moisture content.
Mechanical Durability
Mechanical durability simply refers to how dense the pellet is, and how well it is formed. As to the pellets made by biomass pelleting machine, the denser the stronger. The advantage is the pellets withstand transportation better, and work more efficiently in the pellet burner. So mechanical durability has be a quality index all through our pelleting machine producing.
When a quality pellet has exited the biomass pelleting machine, it should have a smooth surface, with little or no cracks. If the pellet is cracking and expanding it is because there is too much moisture within the pellet, or poor compression within the pelleting machine. Once a quality pellet has cooled, it should be like a coloring crayon. The surface of the pellet should be smooth, and have a surface shine.
Wood pellets tend to shine more than others; the most important thing is the pellets smooth compact state. Try tapping the pellet against a hard surface, to see if the pellet stays intact, or if they crumble or easily crush and separate. The length of pellets biomass pelleting machine can make is not really that important. However if pellets are too long (above 1 inch) they can cause damage to the auger in the pellet burner.
Moisture Content
The less moisture within a pellet, the more energy the pellet burner can use. However a certain percentage of moisture is required in the pelleting process, so the target is to keep moisture as low as possible while still creating quality pellets. Targets should be for moisture content in the finished pellets below 10%. Pellets with more than 10% will burn, but at the cost of efficiency.
