Wood pellets are a common biomass fuel and are considered a renewable energy source due to the relatively small amount of carbon dioxide produced when they are burned. Wood pellets come from a wide range of raw materials, including waste wood, sawdust, crops, rice husks, etc. , the following are some common wood pellet raw materials
Sawdust
Sawdust is a common raw material for making wood pellets. It is wood chips produced in the process of lumber, woodworking, papermaking, etc. The wood chips can be processed into wood pellets by compression molding, drying, etc. As the raw material of wood pellets, wood chips have the advantages of low cost, easy availability, and easy processing, so they are widely used.
Wood
Wood blocks cut directly from trees are also a kind of wood pellet raw material. Wood usually needs to be crushed, dried, compressed, etc. to make wood pellets. Due to the large diameter of wood blocks, processing is difficult, so the production cost is relatively high high.
Waste wood
Abandoned building wood materials, wooden furniture, wooden boxes, etc. can also be used as raw materials for wood pellets. These waste wood usually need to be cleaned, broken, and removed of impurities before they can be used to make wood pellets. Because these raw materials usually have high The water content and impurity content are relatively high, and the processing is difficult, so the production cost is also high.
Crop straw
Crop stalks can also be used as raw materials for wood pellets. Common crop stalks include corn stalks, rice straw, etc. These straws usually need to be crushed and dried before they can be made into wood pellets. Using crop straws as raw materials for wood pellets can effectively use resources, reduce waste, and reduce environmental pollution caused by open burning of crop straws.
In addition to choosing the right raw materials, the following points need to be paid attention to when making wood pellets
Control the moisture content of raw materials
The moisture content of raw materials is one of the key factors affecting the quality and calorific value of wood pellets. Usually, the moisture content of raw materials for wood pellets should be controlled below 10%, otherwise the pelleting effect and quality will be affected.
use proper processing techniques
Different raw materials require different processing techniques. For example, wood chips usually need to be crushed, screened, dried, pressed, etc., while wood blocks need to be crushed, peeled, dried, pressed, etc.
Pay attention to control the size and density of particles
The size and density of wood pellets are also one of the important factors affecting the quality and calorific value of pellets. Generally speaking, the diameter of wood pellets should be controlled between 6-8 mm, and the density should be controlled between 1.0-1.4 g/cm3 .
Pay attention to storage and transportation
The produced wood pellets need to be stored and transported. During storage, moisture, direct sunlight, etc. should be avoided to avoid affecting the quality of the pellets. When transporting, care should be taken to select appropriate packaging and transportation methods to avoid abrasion and fragmentation of the pellets. , affecting its calorific value and quality.