Small Pellet Plant

For the ones who plan to build a small pelletizing unit with capacity between 500kg/h to 800kg/h, or want to start a small pellet making factory with limited budget, this automatic mini pellet plant is definitely what you need!

Stamping Briquette Machine

Mechanical stamping briquette plant can make both large biomass briquettes and small fuel pellets.
Processing Various Biomass Materials
Long Service Life, Good Strength
High Production Efficiency

How To Build A Wood Pellet Production Line?

In recent years, the popularity of wood pellets is increased tremendously. Due to its convenient and economic, more and more people choose pellet fuel for heating and cooking, including individual and commercial application. So the demand for wood pellets is growing rapidly. Now, invest in wood pellet production is promising and profitable in a long run. The development of bio-fuel is good to our environment and agricultural industry. To promote the development of bio-fuel, many countries have regulated the related policy and taxed, including China. Actually, wood pellet plant can process more than just wood materials. Almost all kinds of biomass materials can be used as feedstock for making pellets.

In this article, let’s take a further look at wood pellet line and the details of pellets manufacturing process.

Characteristic of Biomass Pellet Fuel

making biomass wood pellets
Biomass Pellet Fuel Make From Different Materials

Almost all kinds of biomass substance can be used to make biomass pellets including bamboo, palm fiber, bagasse, corn cobs, maize stalks, cotton stalks, wheat straw, rick husk, twigs, tree branches, bark, wood shavings, sawdust and so on. Compared with raw feedstock, biomass pellets have the properties of ecological and sustainable, higher energy dense and are easier and cleaner to use. All these advantages make biomass pellet fuel attractive and hot sale.

Generally, pellets are made to be cylindrical, with a diameter is between 6mm and 8mm. The maximum length is 38mm. There are also larger biomass cylindrical prodcuts. They are normally called "biomass briquettes". The diameter of biomass briquetters can reach up to 25mm. Good pellets are durable, hard and have less ash remaining after combustion. Standard pellets have about 2% ash, while the ash content of premium pellets is less than 1%.

Build Your Own Wood Pellet Plant

Pre-treatment Process

Small-scale Pellet Production
Small Scale Pellet Plant

Large-scale Pellet Production

Large Scale Pellet Plant

How to Manufacture Biomass Pellets?

The key parts of pellet machine is pellet die and pellet roller. During the pelletizing process, high pressure and high temperature will generated between the die and roller. The biomass feedstock will fuses together under the high temperature and then be extruded through the holes in the pellet die, forming a cylindrical solid mass. Below is the process of complete biomass pellet plant.

making biomass pellets
Various Kinds of Biomass Materials Suitable for Making Bio-fuel Pellets

  • Raw Material Grinding

For standard pellet making machinery, the size of raw materials is required to be less than 3mm. Crusher and hammer mill are all available to do th grinding. If the biomass materials are too big such as branches or twigs, a chipper is needed, to cut the materials into required size of crusher or hammer mill. Small biomass feedstock such as sawdust or dry grass can be pelletized directly be pellet making equipment.
  • Drying

Drying feedstock to appropriate moisture content is vital for the quality of final pellets. Different materials have different requirements on moisture. 15% is suggested when making wood pellets. You can choose specific drying equipment or choose to dry by sunshine and wind in th open air. Add some water or inject steam if the materials are too dry.
  • Pelletizing / Extrusion

This is the core part of pellet production process. When starting the pellet mill, the pellet roller will compress the feedstock against the pellet die, which has many small holes drilled though it. In this process friction between the die and roller will generate high temperate to fuse the biomass. When the biomass materials are squeezed through the die holes, they will be extruded into cylindrical solid mass. There is a blade on the other side of the die, which is used to cut the cylindrical solid into pellets with predefined length.
Although various kinds of biomass materials are suitable for making pellet fuel, some of them are better than others for pelletzing. Sawdust is most common and best materials, because of contenting lignin. Grass is also good choice, but grass pellets are less dense than sawdust biomass pellets. For the biomass materials which are hard to process, mix with some sawdust or add appropriate binder to help. 
  • Cooling

The temperature of pellets is very high and can reach 150C at the moment be produced. They are also fairly soft at that moment. So, they are necessary to be cooled and dried before ready for sale or use (Pellet Cooler for Sale). This task can be done by blowing air through the pellets in the storage silo. The moisture content of final pellets should be less than 8%.
  • Packaging

Use overhead hopper, conveyor and bagging equipment to achieve the packaging. Or, you can also choose to sale the pellets in bulk.